Difference between revisions of "Protocol"

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Line 5: Line 5:
 
   |ICON =  
 
   |ICON =  
 
   |HEADING = Heads up!
 
   |HEADING = Heads up!
   |CONTENT = This article is about the protocol for the latest '''stable''' release of Minecraft '''computer edition''' ([[Protocol version numbers|1.14.4, protocol 498]]). For the computer edition pre-releases, see [[Pre-release protocol]]. For Pocket Edition, see [[Pocket Edition Protocol Documentation]].
+
   |CONTENT = This article is about the protocol for the latest '''stable''' release of Minecraft '''Java Edition''' ([[Protocol version numbers|1.16.3, protocol 753]]). For the Java Edition pre-releases, see [[Pre-release protocol]]. For the incomplete Bedrock Edition docs, see [[Bedrock Protocol]]. For the old Pocket Edition, see [[Pocket Edition Protocol Documentation]].
 
}}
 
}}
  
Line 47: Line 47:
 
  |-
 
  |-
 
  | Global palette
 
  | Global palette
  | A table/dictionary/palette mapping nonnegative integers to block states. Block state IDs are created in a linear fashion based off of order of assignment.  One block state ID allocated for each unique block state for a block; if a block has multiple properties then the number of allocated states is the product of the number of values for each property.  A current list of properties and state ID ranges is found on [https://pokechu22.github.io/Burger/1.14.4.html burger].
+
  | A table/dictionary/palette mapping nonnegative integers to block states. Block state IDs are created in a linear fashion based off of order of assignment.  One block state ID allocated for each unique block state for a block; if a block has multiple properties then the number of allocated states is the product of the number of values for each property.  A current list of properties and state ID ranges is found on [https://pokechu22.github.io/Burger/1.16.3.html burger].
  
 
Alternatively, the vanilla server now includes an option to export the current block state ID mapping, by running <code>java -cp minecraft_server.jar net.minecraft.data.Main --reports</code>.  See [[Data Generators]] for more information.
 
Alternatively, the vanilla server now includes an option to export the current block state ID mapping, by running <code>java -cp minecraft_server.jar net.minecraft.data.Main --reports</code>.  See [[Data Generators]] for more information.
Line 66: Line 66:
 
  | Length
 
  | Length
 
  | VarInt
 
  | VarInt
  | Length of packet data + length of the packet ID
+
  | Length of Packet ID + Data
 
  |-
 
  |-
 
  | Packet ID
 
  | Packet ID
Line 140: Line 140:
 
  | Protocol Version
 
  | Protocol Version
 
  | VarInt
 
  | VarInt
  | See [[protocol version numbers]] (currently 498 in Minecraft 1.14.4)
+
  | See [[protocol version numbers]] (currently 753 in Minecraft 1.16.3)
 
  |-
 
  |-
 
  | Server Address
 
  | Server Address
Line 179: Line 179:
 
See [[Server List Ping#1.6]] for the details of the protocol that follows this packet.
 
See [[Server List Ping#1.6]] for the details of the protocol that follows this packet.
  
== Play ==
+
== Status ==
 +
{{Main|Server List Ping}}
  
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Spawn Object ====
+
==== Response ====
 
 
Sent by the server when a vehicle or other object is created.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 195: Line 194:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="12"| 0x00
+
  |rowspan="2"| 0x00
  |rowspan="12"| Play
+
  |rowspan="2"| Status
  |rowspan="12"| Client
+
  |rowspan="2"| Client
| Entity ID
 
| VarInt
 
| EID of the object
 
 
  |-
 
  |-
  | Object UUID
+
  | JSON Response
  | UUID
+
  | String (32767)
  |  
+
  | See [[Server List Ping#Response]]; as with all strings this is prefixed by its length as a VarInt
 +
|}
 +
 
 +
==== Pong ====
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | Type
+
  | 0x01
  | VarInt
+
| Status
  | The type of object (same as in [[#Spawn Mob|Spawn Mob]])
+
| Client
 +
| Payload
 +
  | Long
 +
  | Should be the same as sent by the client
 +
|}
 +
 
 +
=== Serverbound ===
 +
 
 +
==== Request ====
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | X
+
  | 0x00
  | Double
+
  | Status
  |  
+
  | Server
  |-
+
  |colspan="3"| ''no fields''
| Y
 
| Double
 
|
 
|-
 
| Z
 
| Double
 
|
 
|-
 
| Pitch
 
| Angle
 
|
 
|-
 
| Yaw
 
| Angle
 
|
 
|-
 
| Data
 
| Int
 
| Meaning dependent on the value of the Type field, see [[Object Data]] for details.
 
|-
 
| Velocity X
 
| Short
 
|rowspan="3"| Same units as [[#Entity Velocity|Entity Velocity]].  Always sent, but only used when Data is greater than 0 (except for some entities which always ignore it; see [[Object Data]] for details).
 
|-
 
| Velocity Y
 
| Short
 
|-
 
| Velocity Z
 
| Short
 
 
  |}
 
  |}
  
==== Spawn Experience Orb ====
+
==== Ping ====
 
 
Spawns one or more experience orbs.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
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  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x01
+
  | 0x01
  |rowspan="5"| Play
+
| Status
|rowspan="5"| Client
+
| Server
  | Entity ID
+
| Payload
  | VarInt
+
| Long
|
+
| May be any number. Notchian clients use a system-dependent time value which is counted in milliseconds.
  |-
+
  |}
  | X
+
 
  | Double
+
== Login ==
  |
+
 
 +
The login process is as follows:
 +
 
 +
# C→S: [[#Handshake|Handshake]] with Next State set to 2 (login)
 +
# C→S: [[#Login Start|Login Start]]
 +
# S→C: [[#Encryption Request|Encryption Request]]
 +
# Client auth
 +
# C→S: [[#Encryption Response|Encryption Response]]
 +
# Server auth, both enable encryption
 +
# S→C: [[#Set Compression|Set Compression]] (optional)
 +
# S→C: [[#Login Success|Login Success]]
 +
 
 +
Set Compression, if present, must be sent before Login Success. Note that anything sent after Set Compression must use the [[#With_compression|Post Compression packet format]].
 +
 
 +
For unauthenticated ("cracked"/offline-mode) and localhost connections (either of the two conditions is enough for an unencrypted connection) there is no encryption. In that case [[#Login Start|Login Start]] is directly followed by [[#Login Success|Login Success]].
 +
 
 +
See [[Protocol Encryption]] for details.
 +
 
 +
=== Clientbound ===
 +
 
 +
==== Disconnect (login) ====
 +
 
 +
{| class="wikitable"
 +
  ! Packet ID
 +
  ! State
 +
  ! Bound To
 +
  ! Field Name
 +
  ! Field Type
 +
  ! Notes
 
  |-
 
  |-
  | Y
+
  | 0x00
  | Double
+
  | Login
  |  
+
  | Client
  |-
+
  | Reason
  | Z
+
  | [[Chat]]
| Double
 
 
  |  
 
  |  
|-
 
| Count
 
| Short
 
| The amount of experience this orb will reward once collected
 
 
  |}
 
  |}
  
==== Spawn Global Entity ====
+
==== Encryption Request ====
 
 
With this packet, the server notifies the client of thunderbolts striking within a 512 block radius around the player. The coordinates specify where exactly the thunderbolt strikes.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 293: Line 306:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x02
+
  |rowspan="5"| 0x01
  |rowspan="5"| Play
+
  |rowspan="5"| Login
 
  |rowspan="5"| Client
 
  |rowspan="5"| Client
  | Entity ID
+
  | Server ID
 +
| String (20)
 +
| Appears to be empty
 +
|-
 +
| Public Key Length
 
  | VarInt
 
  | VarInt
  | The EID of the thunderbolt
+
  | Length of Public Key
 
  |-
 
  |-
  | Type
+
  | Public Key
  | Byte Enum
+
  | Byte Array
| The global entity type, currently always 1 for thunderbolt
 
|-
 
| X
 
| Double
 
 
  |  
 
  |  
 
  |-
 
  |-
  | Y
+
  | Verify Token Length
  | Double
+
  | VarInt
  |  
+
  | Length of Verify Token. Always 4 for Notchian servers.
 
  |-
 
  |-
  | Z
+
  | Verify Token
  | Double
+
  | Byte Array
  |  
+
  | A sequence of random bytes generated by the server
 
  |}
 
  |}
  
==== Spawn Mob ====
+
See [[Protocol Encryption]] for details.
  
Sent by the server when a mob entity is spawned.
+
==== Login Success ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 329: Line 342:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="13"| 0x03
+
  |rowspan="2"| 0x02
  |rowspan="13"| Play
+
  |rowspan="2"| Login
  |rowspan="13"| Client
+
  |rowspan="2"| Client
  | Entity ID
+
  | UUID
  | VarInt
+
  | UUID
 
  |  
 
  |  
 
  |-
 
  |-
  | Entity UUID
+
  | Username
  | UUID
+
  | String (16)
 
  |  
 
  |  
 +
|}
 +
 +
This packet switches the connection state to [[#Play|play]].
 +
 +
{{Warning2|The (notchian) server might take a bit to fully transition to the Play state, so it's recommended to wait before sendings Play packets, either by setting a timeout, or waiting for Play packets from the server (usually [[#Player Info|Player Info]]).
 +
 +
The notchian client doesn't send any (non-[[#Keep Alive|keep alive]]) packets until the next tick/[[#Time Update|time update]] packet.
 +
}}
 +
 +
==== Set Compression ====
 +
 +
Enables compression.  If compression is enabled, all following packets are encoded in the [[#With compression|compressed packet format]].  Negative or zero values will disable compression, meaning the packet format should remain in the [[#Without compression|uncompressed packet format]].  However, this packet is entirely optional, and if not sent, compression will also not be enabled (the notchian server does not send the packet when compression is disabled).
 +
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | Type
+
  | 0x03
 +
| Login
 +
| Client
 +
| Threshold
 
  | VarInt
 
  | VarInt
  | The type of mob. See [[Entities#Mobs]]
+
  | Maximum size of a packet before it is compressed
|-
 
| X
 
| Double
 
|
 
|-
 
| Y
 
| Double
 
|
 
|-
 
| Z
 
| Double
 
|
 
|-
 
| Yaw
 
| Angle
 
|
 
|-
 
| Pitch
 
| Angle
 
|
 
|-
 
| Head Pitch
 
| Angle
 
|
 
|-
 
| Velocity X
 
| Short
 
| Same units as [[#Entity Velocity|Entity Velocity]]
 
|-
 
| Velocity Y
 
| Short
 
| Same units as [[#Entity Velocity|Entity Velocity]]
 
|-
 
| Velocity Z
 
| Short
 
| Same units as [[#Entity Velocity|Entity Velocity]]
 
|-
 
| Metadata
 
| [[Entities#Entity Metadata Format|Entity Metadata]]
 
|
 
 
  |}
 
  |}
  
==== Spawn Painting ====
+
==== Login Plugin Request ====
 +
 
 +
Used to implement a custom handshaking flow together with [[#Login_Plugin_Response | Login Plugin Response]].
  
This packet shows location, name, and type of painting.
+
Unlike plugin messages in "play" mode, these messages follow a lock-step request/response scheme, where the client is expected to respond to a request indicating whether it understood. The notchian client always responds that it hasn't understood, and sends an empty payload.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 397: Line 395:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x04
+
  |rowspan="3"| 0x04
  |rowspan="5"| Play
+
  |rowspan="3"| Login
  |rowspan="5"| Client
+
  |rowspan="3"| Client
  | Entity ID
+
  | Message ID
 
  | VarInt
 
  | VarInt
  |  
+
  | Generated by the server - should be unique to the connection.
 
  |-
 
  |-
  | Entity UUID
+
  | Channel
  | UUID
+
  | Identifier
  |  
+
  | Name of the [[plugin channel]] used to send the data
 
  |-
 
  |-
  | Motive
+
  | Data
  | VarInt
+
  | Byte Array
  | Panting's ID, see below
+
  | Any data, depending on the channel. The length of this array must be inferred from the packet length.
|-
 
| Location
 
| Position
 
| Center coordinates (see below)
 
|-
 
| Direction
 
| Byte Enum
 
| Direction the painting faces (North = 2, South = 0, West = 1, East = 3)
 
 
  |}
 
  |}
  
Calculating the center of an image: given a (width × height) grid of cells, with <code>(0, 0)</code> being the top left corner, the center is <code>(max(0, width / 2 - 1), height / 2)</code>. E.g. <code>(1, 0)</code> for a 2×1 painting, or <code>(1, 2)</code> for a 4×4 painting.
+
=== Serverbound ===
  
List of paintings by coordinates in <code>paintings_kristoffer_zetterstrand.png</code> (where x and y are in pixels from the top left and width and height are in pixels or 16ths of a block):
+
==== Login Start  ====
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Name
+
  ! Packet ID
  ! ID
+
  ! State
  ! x
+
  ! Bound To
  ! y
+
  ! Field Name
  ! width
+
  ! Field Type
  ! height
+
  ! Notes
 
  |-
 
  |-
  | <code>minecraft:kebab</code>
+
  | 0x00
  | 0
+
  | Login
  | 0
+
  | Server
  | 0
+
  | Name
  | 16
+
  | String (16)
  | 16
+
  | Player's Username
  |-
+
  |}
  | <code>minecraft:aztec</code>
+
 
  | 1
+
==== Encryption Response ====
  | 16
+
 
  | 0
+
{| class="wikitable"
  | 16
+
  ! Packet ID
  | 16
+
  ! State
 +
  ! Bound To
 +
  ! Field Name
 +
  ! Field Type
 +
  ! Notes
 
  |-
 
  |-
  | <code>minecraft:alban</code>
+
  |rowspan="4"| 0x01
  | 2
+
  |rowspan="4"| Login
  | 32
+
  |rowspan="4"| Server
  | 0
+
  | Shared Secret Length
  | 16
+
  | VarInt
  | 16
+
  | Length of Shared Secret
 
  |-
 
  |-
  | <code>minecraft:aztec2</code>
+
  | Shared Secret
  | 3
+
  | Byte Array
  | 48
+
  |  
| 0
 
| 16
 
| 16
 
 
  |-
 
  |-
  | <code>minecraft:bomb</code>
+
  | Verify Token Length
  | 4
+
  | VarInt
  | 64
+
  | Length of Verify Token
| 0
 
| 16
 
| 16
 
 
  |-
 
  |-
  | <code>minecraft:plant</code>
+
  | Verify Token
  | 5
+
  | Byte Array
  | 80
+
  |  
  | 0
+
  |}
  | 16
+
 
  | 16
+
See [[Protocol Encryption]] for details.
 +
 
 +
==== Login Plugin Response ====
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
  ! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
  ! Notes
 
  |-
 
  |-
  | <code>minecraft:wasteland</code>
+
  |rowspan="3"| 0x02
  | 6
+
  |rowspan="3"| Login
  | 96
+
  |rowspan="3"| Server
  | 0
+
  | Message ID
  | 16
+
  | VarInt
  | 16
+
  | Should match ID from server.
 
  |-
 
  |-
  | <code>minecraft:pool</code>
+
  | Successful
| 7
+
| Boolean
| 0
+
| <code>true</code> if the client understands the request, <code>false</code> otherwise. When <code>false</code>, no payload follows.
| 32
 
| 32
 
| 16
 
 
  |-
 
  |-
  | <code>minecraft:courbet</code>
+
  | Data
  | 8
+
  | Optional Byte Array
  | 32
+
  | Any data, depending on the channel. The length of this array must be inferred from the packet length.
  | 32
+
  |}
| 32
+
 
| 16
+
== Play ==
|-
+
 
  | <code>minecraft:sea</code>
+
=== Clientbound ===
  | 9
+
 
  | 64
+
==== Spawn Entity ====
  | 32
+
 
  | 32
+
Sent by the server when a vehicle or other non-living entity is created.
  | 16
+
 
 +
{| class="wikitable"
 +
  ! Packet ID
 +
  ! State
 +
  ! Bound To
 +
  ! Field Name
 +
  ! Field Type
 +
  ! Notes
 
  |-
 
  |-
  | <code>minecraft:sunset</code>
+
  |rowspan="12"| 0x00
  | 10
+
  |rowspan="12"| Play
  | 96
+
  |rowspan="12"| Client
  | 32
+
  | Entity ID
  | 32
+
  | VarInt
  | 16
+
  | EID of the entity
 
  |-
 
  |-
  | <code>minecraft:creebet</code>
+
  | Object UUID
  | 11
+
  | UUID
  | 128
+
  |  
| 32
 
| 32
 
| 16
 
 
  |-
 
  |-
  | <code>minecraft:wanderer</code>
+
  | Type
  | 12
+
  | VarInt
  | 0
+
  | The type of entity (same as in [[#Spawn Living Entity|Spawn Living Entity]])
| 64
 
| 16
 
| 32
 
 
  |-
 
  |-
  | <code>minecraft:graham</code>
+
  | X
  | 13
+
  | Double
  | 16
+
  |  
| 64
 
| 16
 
| 32
 
 
  |-
 
  |-
  | <code>minecraft:match</code>
+
  | Y
  | 14
+
  | Double
  | 0
+
  |  
| 128
 
| 32
 
| 32
 
 
  |-
 
  |-
  | <code>minecraft:bust</code>
+
  | Z
  | 15
+
  | Double
  | 32
+
  |  
| 128
 
| 32
 
| 32
 
 
  |-
 
  |-
  | <code>minecraft:stage</code>
+
  | Pitch
  | 16
+
  | Angle
  | 64
+
  |  
| 128
 
| 32
 
| 32
 
 
  |-
 
  |-
  | <code>minecraft:void</code>
+
  | Yaw
  | 17
+
  | Angle
  | 96
+
  |  
| 128
 
| 32
 
| 32
 
 
  |-
 
  |-
  | <code>skull_and_roses</code>
+
  | Data
  | 18
+
  | Int
  | 128
+
  | Meaning dependent on the value of the Type field, see [[Object Data]] for details.
| 128
 
| 32
 
| 32
 
 
  |-
 
  |-
  | <code>minecraft:wither</code>
+
  | Velocity X
  | 19
+
  | Short
  | 160
+
  |rowspan="3"| Same units as [[#Entity Velocity|Entity Velocity]]. Always sent, but only used when Data is greater than 0 (except for some entities which always ignore it; see [[Object Data]] for details).
| 128
 
| 32
 
  | 32
 
 
  |-
 
  |-
  | <code>minecraft:fighters</code>
+
  | Velocity Y
  | 20
+
  | Short
| 0
 
| 96
 
| 64
 
| 32
 
 
  |-
 
  |-
  | <code>minecraft:pointer</code>
+
  | Velocity Z
  | 21
+
  | Short
| 0
 
| 192
 
| 64
 
| 64
 
|-
 
| <code>minecraft:pigscene</code>
 
| 22
 
| 64
 
| 192
 
| 64
 
| 64
 
|-
 
| <code>minecraft:burning_skull</code>
 
| 23
 
| 128
 
| 192
 
| 64
 
| 64
 
|-
 
| <code>minecraft:skeleton</code>
 
| 24
 
| 192
 
| 64
 
| 64
 
| 48
 
|-
 
| <code>minecraft:donkey_kong</code>
 
| 25
 
| 192
 
| 112
 
| 64
 
| 48
 
 
  |}
 
  |}
  
The {{Minecraft Wiki|Painting#Canvases|Minecraft Wiki article on paintings}} also provides a list of painting names to the actual images.
+
==== Spawn Experience Orb ====
  
==== Spawn Player ====
+
Spawns one or more experience orbs.
 
 
This packet is sent by the server when a player comes into visible range, ''not'' when a player joins.
 
 
 
This packet must be sent after the [[#Player Info|Player Info]] packet that adds the player data for the client to use when spawning a player. If the Player Info for the player spawned by this packet is not present when this packet arrives, Notchian clients will not spawn the player entity. The Player Info packet includes skin/cape data.
 
 
 
Servers can, however, safely spawn player entities for players not in visible range. The client appears to handle it correctly.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 634: Line 567:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="8"| 0x05
+
  |rowspan="5"| 0x01
  |rowspan="8"| Play
+
  |rowspan="5"| Play
  |rowspan="8"| Client
+
  |rowspan="5"| Client
 
  | Entity ID
 
  | Entity ID
 
  | VarInt
 
  | VarInt
  | Player's EID
+
  |  
 
  |-
 
  |-
| Player UUID
+
  | X
| UUID
 
| See below for notes on {{Minecraft Wiki|Server.properties#online-mode|offline mode}} and NPCs
 
|-
 
  | X
 
 
  | Double
 
  | Double
 
  |  
 
  |  
Line 657: Line 586:
 
  |  
 
  |  
 
  |-
 
  |-
  | Yaw
+
  | Count
  | Angle
+
  | Short
|
+
  | The amount of experience this orb will reward once collected
|-
 
| Pitch
 
| Angle
 
|
 
|-
 
| Metadata
 
| [[Entities#Entity Metadata Format|Entity Metadata]]
 
  |  
 
 
  |}
 
  |}
  
When in {{Minecraft Wiki|Server.properties#online-mode|online mode}}, the UUIDs must be valid and have valid skin blobs.
+
==== Spawn Living Entity ====
 
 
In offline mode, [[Wikipedia:Universally unique identifier#Versions 3 and 5 (namespace name-based)|UUID v3]] is used with the String <code>OfflinePlayer:&lt;player name&gt;</code>, encoded in UTF-8 (and case-sensitive).
 
 
 
For NPCs UUID v2 should be used. Note:
 
 
 
<+Grum> i will never confirm this as a feature you know that :)
 
 
 
In an example UUID, <code>xxxxxxxx-xxxx-Yxxx-xxxx-xxxxxxxxxxxx</code>, the UUID version is specified by <code>Y</code>. So, for UUID v3, <code>Y</code> will always be <code>3</code>, and for UUID v2, <code>Y</code> will always be <code>2</code>.
 
 
 
==== Animation (clientbound) ====
 
  
Sent whenever an entity should change animation.
+
Sent by the server when a living entity is spawned.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 692: Line 603:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x06
+
  |rowspan="12"| 0x02
  |rowspan="2"| Play
+
  |rowspan="12"| Play
  |rowspan="2"| Client
+
  |rowspan="12"| Client
 
  | Entity ID
 
  | Entity ID
 
  | VarInt
 
  | VarInt
  | Player ID
+
  |  
 
  |-
 
  |-
  | Animation
+
  | Entity UUID
  | Unsigned Byte
+
  | UUID
  | Animation ID (see below)
+
  |  
|}
 
 
 
Animation can be one of the following values:
 
 
 
{| class="wikitable"
 
! ID
 
! Animation
 
 
  |-
 
  |-
  | 0
+
  | Type
  | Swing main arm
+
  | VarInt
 +
| The type of mob. See [[Entities#Mobs]]
 
  |-
 
  |-
  | 1
+
  | X
  | Take damage
+
| Double
 +
|
 +
|-
 +
| Y
 +
| Double
 +
|
 +
|-
 +
| Z
 +
| Double
 +
|
 +
|-
 +
| Yaw
 +
| Angle
 +
|
 +
|-
 +
| Pitch
 +
| Angle
 +
  |  
 
  |-
 
  |-
  | 2
+
  | Head Pitch
  | Leave bed
+
| Angle
 +
  |  
 
  |-
 
  |-
  | 3
+
  | Velocity X
  | Swing offhand
+
  | Short
 +
| Same units as [[#Entity Velocity|Entity Velocity]]
 
  |-
 
  |-
  | 4
+
  | Velocity Y
  | Critical effect
+
  | Short
 +
| Same units as [[#Entity Velocity|Entity Velocity]]
 
  |-
 
  |-
  | 5
+
  | Velocity Z
  | Magic critical effect
+
  | Short
 +
| Same units as [[#Entity Velocity|Entity Velocity]]
 
  |}
 
  |}
  
==== Statistics ====
+
==== Spawn Painting ====
  
Sent as a response to [[#Client_Status|Client Status 0x04]] (id 1).
+
This packet shows location, name, and type of painting.
  
 
{| class="wikitable"
 
{| class="wikitable"
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
  ! Bound To  
+
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x07
+
  |rowspan="5"| 0x03
  |rowspan="4"| Play
+
  |rowspan="5"| Play
  |rowspan="4"| Client
+
  |rowspan="5"| Client
  |colspan="2"| Count
+
  | Entity ID
  |colspan="2"| VarInt
+
| VarInt
  | Number of elements in the following array
+
|
 +
|-
 +
  | Entity UUID
 +
| UUID
 +
  |  
 
  |-
 
  |-
  |rowspan="2"| Statistic
+
  | Motive
| Category ID
 
|rowspan="2"| Array
 
 
  | VarInt
 
  | VarInt
  | See below
+
  | Panting's ID, see below
 
  |-
 
  |-
  | Statistic ID
+
  | Location
  | VarInt
+
  | Position
  | See below
+
  | Center coordinates (see below)
 
  |-
 
  |-
  |colspan="2"| Value
+
  | Direction
  |colspan="2"| VarInt
+
| Byte Enum
| The amount to set it to
+
  | Direction the painting faces (North = 2, South = 0, West = 1, East = 3)
 
  |}
 
  |}
  
Categories (these are namespaced, but with <code>:</code> replaced with <code>.</code>):
+
Calculating the center of an image: given a (width × height) grid of cells, with <code>(0, 0)</code> being the top left corner, the center is <code>(max(0, width / 2 - 1), height / 2)</code>. E.g. <code>(1, 0)</code> for a 2×1 painting, or <code>(1, 2)</code> for a 4×4 painting.
 +
 
 +
List of paintings by coordinates in <code>paintings_kristoffer_zetterstrand.png</code> (where x and y are in pixels from the top left and width and height are in pixels or 16ths of a block):
  
 
{| class="wikitable"
 
{| class="wikitable"
 
  ! Name
 
  ! Name
 
  ! ID
 
  ! ID
  ! Registry
+
  ! x
 +
! y
 +
! width
 +
! height
 
  |-
 
  |-
  | <code>minecraft.mined</code>
+
  | <code>minecraft:kebab</code>
 +
| 0
 +
| 0
 
  | 0
 
  | 0
  | Blocks
+
  | 16
 +
| 16
 
  |-
 
  |-
  | <code>minecraft.crafted</code>
+
  | <code>minecraft:aztec</code>
 
  | 1
 
  | 1
  | Items
+
  | 16
 +
| 0
 +
| 16
 +
| 16
 
  |-
 
  |-
  | <code>minecraft.used</code>
+
  | <code>minecraft:alban</code>
 
  | 2
 
  | 2
  | Items
+
  | 32
 +
| 0
 +
| 16
 +
| 16
 
  |-
 
  |-
  | <code>minecraft.broken</code>
+
  | <code>minecraft:aztec2</code>
 
  | 3
 
  | 3
  | Items
+
  | 48
 +
| 0
 +
| 16
 +
| 16
 
  |-
 
  |-
  | <code>minecraft.picked_up</code>
+
  | <code>minecraft:bomb</code>
 
  | 4
 
  | 4
  | Items
+
  | 64
 +
| 0
 +
| 16
 +
| 16
 
  |-
 
  |-
  | <code>minecraft.dropped</code>
+
  | <code>minecraft:plant</code>
 
  | 5
 
  | 5
  | Items
+
  | 80
 +
| 0
 +
| 16
 +
| 16
 
  |-
 
  |-
  | <code>minecraft.killed</code>
+
  | <code>minecraft:wasteland</code>
 
  | 6
 
  | 6
  | Entities
+
  | 96
 +
| 0
 +
| 16
 +
| 16
 
  |-
 
  |-
  | <code>minecraft.killed_by</code>
+
  | <code>minecraft:pool</code>
 
  | 7
 
  | 7
  | Entities
+
  | 0
 +
| 32
 +
| 32
 +
| 16
 
  |-
 
  |-
  | <code>minecraft.custom</code>
+
  | <code>minecraft:courbet</code>
 
  | 8
 
  | 8
  | Custom
+
  | 32
  |}
+
  | 32
 
+
| 32
Blocks, Items, and Entities use block (not block state), item, and entity ids.
+
| 16
 
+
|-
Custom has the following (unit only matters for clients):
+
| <code>minecraft:sea</code>
 
+
| 9
{| class="wikitable"
+
| 64
  ! Name
+
  | 32
  ! ID
+
  | 32
  ! Unit
+
  | 16
 
  |-
 
  |-
  | <code>minecraft.leave_game</code>
+
  | <code>minecraft:sunset</code>
  | 0
+
  | 10
  | None
+
  | 96
 +
| 32
 +
| 32
 +
| 16
 
  |-
 
  |-
  | <code>minecraft.play_one_minute</code>
+
  | <code>minecraft:creebet</code>
  | 1
+
  | 11
  | Time
+
  | 128
 +
| 32
 +
| 32
 +
| 16
 
  |-
 
  |-
  | <code>minecraft.time_since_death</code>
+
  | <code>minecraft:wanderer</code>
  | 2
+
  | 12
  | Time
+
  | 0
 +
| 64
 +
| 16
 +
| 32
 
  |-
 
  |-
  | <code>minecraft.sneak_Time</code>
+
  | <code>minecraft:graham</code>
  | 3
+
  | 13
  | Time
+
  | 16
 +
| 64
 +
| 16
 +
| 32
 
  |-
 
  |-
  | <code>minecraft.walk_one_cm</code>
+
  | <code>minecraft:match</code>
  | 4
+
  | 14
  | Distance
+
  | 0
 +
| 128
 +
| 32
 +
| 32
 
  |-
 
  |-
  | <code>minecraft.crouch_one_cm</code>
+
  | <code>minecraft:bust</code>
  | 5
+
  | 15
  | Distance
+
  | 32
 +
| 128
 +
| 32
 +
| 32
 
  |-
 
  |-
  | <code>minecraft.sprint_one_cm</code>
+
  | <code>minecraft:stage</code>
  | 6
+
  | 16
  | Distance
+
  | 64
 +
| 128
 +
| 32
 +
| 32
 
  |-
 
  |-
  | <code>minecraft.swim_one_cm</code>
+
  | <code>minecraft:void</code>
  | 7
+
  | 17
  | Distance
+
  | 96
 +
| 128
 +
| 32
 +
| 32
 
  |-
 
  |-
  | <code>minecraft.fall_one_cm</code>
+
  | <code>skull_and_roses</code>
  | 8
+
  | 18
  | Distance
+
  | 128
 +
| 128
 +
| 32
 +
| 32
 
  |-
 
  |-
  | <code>minecraft.climb_one_cm</code>
+
  | <code>minecraft:wither</code>
  | 9
+
  | 19
  | Distance
+
  | 160
 +
| 128
 +
| 32
 +
| 32
 
  |-
 
  |-
  | <code>minecraft.fly_one_cm</code>
+
  | <code>minecraft:fighters</code>
  | 10
+
  | 20
  | Distance
+
  | 0
 +
| 96
 +
| 64
 +
| 32
 
  |-
 
  |-
  | <code>minecraft.dive_one_cm</code>
+
  | <code>minecraft:pointer</code>
  | 11
+
  | 21
  | Distance
+
  | 0
 +
| 192
 +
| 64
 +
| 64
 
  |-
 
  |-
  | <code>minecraft.minecart_one_cm</code>
+
  | <code>minecraft:pigscene</code>
  | 12
+
  | 22
  | Distance
+
  | 64
 +
| 192
 +
| 64
 +
| 64
 
  |-
 
  |-
  | <code>minecraft.boat_one_cm</code>
+
  | <code>minecraft:burning_skull</code>
  | 13
+
  | 23
  | Distance
+
  | 128
 +
| 192
 +
| 64
 +
| 64
 
  |-
 
  |-
  | <code>minecraft.pig_one_cm</code>
+
  | <code>minecraft:skeleton</code>
  | 14
+
  | 24
  | Distance
+
  | 192
 +
| 64
 +
| 64
 +
| 48
 
  |-
 
  |-
  | <code>minecraft.horse_one_cm</code>
+
  | <code>minecraft:donkey_kong</code>
  | 15
+
  | 25
  | Distance
+
  | 192
  |-
+
  | 112
  | <code>minecraft.aviate_one_cm</code>
+
  | 64
  | 16
+
  | 48
  | Distance
+
  |}
|-
+
 
| <code>minecraft.jump</code>
+
The {{Minecraft Wiki|Painting#Canvases|Minecraft Wiki article on paintings}} also provides a list of painting names to the actual images.
  | 17
+
 
  | None
+
==== Spawn Player ====
 +
 
 +
This packet is sent by the server when a player comes into visible range, ''not'' when a player joins.
 +
 
 +
This packet must be sent after the [[#Player Info|Player Info]] packet that adds the player data for the client to use when spawning a player. If the Player Info for the player spawned by this packet is not present when this packet arrives, Notchian clients will not spawn the player entity. The Player Info packet includes skin/cape data.
 +
 
 +
Servers can, however, safely spawn player entities for players not in visible range. The client appears to handle it correctly.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
  ! Field Type
 +
  ! Notes
 
  |-
 
  |-
  | <code>minecraft.drop</code>
+
  |rowspan="7"| 0x04
  | 18
+
|rowspan="7"| Play
  | None
+
|rowspan="7"| Client
 +
| Entity ID
 +
  | VarInt
 +
  | Player's EID
 
  |-
 
  |-
  | <code>minecraft.damage_dealt</code>
+
  | Player UUID
  | 19
+
  | UUID
  | Damage
+
  | See below for notes on {{Minecraft Wiki|Server.properties#online-mode|offline mode}} and NPCs
 
  |-
 
  |-
  | <code>minecraft.damage_taken</code>
+
  | X
  | 20
+
  | Double
  | Damage
+
  |  
 
  |-
 
  |-
  | <code>minecraft.deaths</code>
+
  | Y
  | 21
+
  | Double
  | None
+
  |  
 
  |-
 
  |-
  | <code>minecraft.mob_kills</code>
+
  | Z
  | 22
+
  | Double
  | None
+
  |  
 
  |-
 
  |-
  | <code>minecraft.animals_bred</code>
+
  | Yaw
  | 23
+
  | Angle
  | None
+
  |  
 
  |-
 
  |-
  | <code>minecraft.player_kills</code>
+
  | Pitch
  | 24
+
| Angle
  | None
+
|
 +
|}
 +
 
 +
When in {{Minecraft Wiki|Server.properties#online-mode|online mode}}, the UUIDs must be valid and have valid skin blobs.
 +
 
 +
In offline mode, [[Wikipedia:Universally unique identifier#Versions 3 and 5 (namespace name-based)|UUID v3]] is used with the String <code>OfflinePlayer:&lt;player name&gt;</code>, encoded in UTF-8 (and case-sensitive).
 +
 
 +
For NPCs UUID v2 should be used. Note:
 +
 
 +
<+Grum> i will never confirm this as a feature you know that :)
 +
 
 +
In an example UUID, <code>xxxxxxxx-xxxx-Yxxx-xxxx-xxxxxxxxxxxx</code>, the UUID version is specified by <code>Y</code>. So, for UUID v3, <code>Y</code> will always be <code>3</code>, and for UUID v2, <code>Y</code> will always be <code>2</code>.
 +
 
 +
==== Entity Animation (clientbound) ====
 +
 
 +
Sent whenever an entity should change animation.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
  ! Bound To
 +
! Field Name
 +
! Field Type
 +
  ! Notes
 
  |-
 
  |-
  | <code>minecraft.fish_caught</code>
+
  |rowspan="2"| 0x05
  | 25
+
|rowspan="2"| Play
  | None
+
|rowspan="2"| Client
 +
| Entity ID
 +
  | VarInt
 +
  | Player ID
 
  |-
 
  |-
  | <code>minecraft.talked_to_villager</code>
+
  | Animation
  | 26
+
  | Unsigned Byte
  | None
+
  | Animation ID (see below)
 +
|}
 +
 
 +
Animation can be one of the following values:
 +
 
 +
{| class="wikitable"
 +
! ID
 +
! Animation
 
  |-
 
  |-
  | <code>minecraft.traded_with_villager</code>
+
  | 0
  | 27
+
  | Swing main arm
| None
 
 
  |-
 
  |-
  | <code>minecraft.eat_cake_slice</code>
+
  | 1
  | 28
+
  | Take damage
| None
 
 
  |-
 
  |-
  | <code>minecraft.fill_cauldron</code>
+
  | 2
  | 29
+
  | Leave bed
| None
 
 
  |-
 
  |-
  | <code>minecraft.use_cauldron</code>
+
  | 3
  | 30
+
  | Swing offhand
| None
 
 
  |-
 
  |-
  | <code>minecraft.clean_armor</code>
+
  | 4
  | 31
+
  | Critical effect
| None
 
 
  |-
 
  |-
  | <code>minecraft.clean_banner</code>
+
  | 5
  | 32
+
| Magic critical effect
  | None
+
|}
 +
 
 +
==== Statistics ====
 +
 
 +
Sent as a response to [[#Client_Status|Client Status 0x04]] (id 1). Will only send the changed values if previously requested.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
  ! State
 +
! Bound To
 +
!colspan="2"| Field Name
 +
  !colspan="2"| Field Type
 +
! Notes
 
  |-
 
  |-
  | <code>minecraft.interact_with_brewingstand</code>
+
  |rowspan="4"| 0x06
  | 33
+
|rowspan="4"| Play
  | None
+
|rowspan="4"| Client
 +
  |colspan="2"| Count
 +
|colspan="2"| VarInt
 +
  | Number of elements in the following array
 
  |-
 
  |-
  | <code>minecraft.interact_with_beacon</code>
+
  |rowspan="3"| Statistic
  | 34
+
| Category ID
  | None
+
|rowspan="3"| Array
 +
  | VarInt
 +
  | See below
 
  |-
 
  |-
  | <code>minecraft.inspect_dropper</code>
+
  | Statistic ID
  | 35
+
  | VarInt
  | None
+
  | See below
 
  |-
 
  |-
  | <code>minecraft.inspect_hopper</code>
+
  | Value
  | 36
+
| VarInt
  | None
+
| The amount to set it to
 +
|}
 +
 
 +
Categories (these are namespaced, but with <code>:</code> replaced with <code>.</code>):
 +
 
 +
{| class="wikitable"
 +
! Name
 +
  ! ID
 +
  ! Registry
 
  |-
 
  |-
  | <code>minecraft.inspect_dispenser</code>
+
  | <code>minecraft.mined</code>
  | 37
+
  | 0
  | None
+
  | Blocks
 
  |-
 
  |-
  | <code>minecraft.play_noteblock</code>
+
  | <code>minecraft.crafted</code>
  | 38
+
  | 1
  | None
+
  | Items
 
  |-
 
  |-
  | <code>minecraft.tune_noteblock</code>
+
  | <code>minecraft.used</code>
  | 39
+
  | 2
  | None
+
  | Items
 
  |-
 
  |-
  | <code>minecraft.pot_flower</code>
+
  | <code>minecraft.broken</code>
  | 40
+
  | 3
  | None
+
  | Items
 
  |-
 
  |-
  | <code>minecraft.trigger_trapped_chest</code>
+
  | <code>minecraft.picked_up</code>
  | 41
+
  | 4
  | None
+
  | Items
 
  |-
 
  |-
  | <code>minecraft.open_enderchest</code>
+
  | <code>minecraft.dropped</code>
  | 42
+
  | 5
  | None
+
  | Items
 
  |-
 
  |-
  | <code>minecraft.enchant_item</code>
+
  | <code>minecraft.killed</code>
  | 43
+
  | 6
  | None
+
  | Entities
 
  |-
 
  |-
  | <code>minecraft.play_record</code>
+
  | <code>minecraft.killed_by</code>
  | 44
+
  | 7
  | None
+
  | Entities
 
  |-
 
  |-
  | <code>minecraft.interact_with_furnace</code>
+
  | <code>minecraft.custom</code>
  | 45
+
  | 8
  | None
+
  | Custom
 +
|}
 +
 
 +
Blocks, Items, and Entities use block (not block state), item, and entity ids.
 +
 
 +
Custom has the following (unit only matters for clients):
 +
 
 +
{| class="wikitable"
 +
! Name
 +
! ID
 +
! Unit
 
  |-
 
  |-
  | <code>minecraft.interact_with_crafting_table</code>
+
  | <code>minecraft.leave_game</code>
  | 46
+
  | 0
 
  | None
 
  | None
 
  |-
 
  |-
  | <code>minecraft.open_chest</code>
+
  | <code>minecraft.play_one_minute</code>
  | 47
+
  | 1
  | None
+
  | Time
 
  |-
 
  |-
  | <code>minecraft.sleep_in_bed</code>
+
  | <code>minecraft.time_since_death</code>
  | 48
+
  | 2
  | None
+
  | Time
 
  |-
 
  |-
  | <code>minecraft.open_shulker_box</code>
+
  | <code>minecraft.sneak_Time</code>
  | 49
+
  | 3
  | None
+
  | Time
|}
 
 
 
Units:
 
 
 
* None: just a normal number (formatted with 0 decimal places)
 
* Damage: value is 10 times the normal amount
 
* Distance: a distance in centimeters (hundredths of blocks)
 
* Time: a time span in ticks
 
 
 
==== Block Break Animation ====
 
 
 
0–9 are the displayable destroy stages and each other number means that there is no animation on this coordinate.
 
 
 
Block break animations can still be applied on air; the animation will remain visible although there is no block being broken.  However, if this is applied to a transparent block, odd graphical effects may happen, including water losing its transparency.  (An effect similar to this can be seen in normal gameplay when breaking ice blocks)
 
 
 
If you need to display several break animations at the same time you have to give each of them a unique Entity ID. The entity ID does not need to correspond to an actual entity on the client. It is valid to use a randomly generated number.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x08
+
  | <code>minecraft.walk_one_cm</code>
|rowspan="3"| Play
+
  | 4
|rowspan="3"| Client
+
  | Distance
| Entity ID
 
  | VarInt
 
  | Entity ID of the entity breaking the block
 
 
  |-
 
  |-
  | Location
+
  | <code>minecraft.crouch_one_cm</code>
  | Position
+
  | 5
  | Block Position
+
  | Distance
 
  |-
 
  |-
  | Destroy Stage
+
  | <code>minecraft.sprint_one_cm</code>
| Byte
+
  | 6
  | 0–9 to set it, any other value to remove it
+
  | Distance
  |}
 
 
 
==== Update Block Entity ====
 
 
 
Sets the block entity associated with the block at the given location.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x09
+
  | <code>minecraft.swim_one_cm</code>
|rowspan="3"| Play
+
  | 7
|rowspan="3"| Client
+
  | Distance
| Location
 
  | Position
 
  |  
 
 
  |-
 
  |-
  | Action
+
  | <code>minecraft.fall_one_cm</code>
  | Unsigned Byte
+
  | 8
  | The type of update to perform, see below
+
  | Distance
 
  |-
 
  |-
  | NBT Data
+
  | <code>minecraft.climb_one_cm</code>
| [[NBT|NBT Tag]]
+
  | 9
| Data to set. May be a TAG_END (0), in which case the block entity at the given location is removed (though this is not required since the client will remove the block entity automatically on chunk unload or block removal)
+
  | Distance
  |}
 
 
 
''Action'' field:
 
 
 
* '''1''': Set data of a mob spawner (everything except for SpawnPotentials: current delay, min/max delay, mob to be spawned, spawn count, spawn range, etc.)
 
* '''2''': Set command block text (command and last execution status)
 
* '''3''': Set the level, primary, and secondary powers of a beacon
 
* '''4''': Set rotation and skin of mob head
 
* '''5''': Declare a conduit
 
* '''6''': Set base color and patterns on a banner
 
* '''7''': Set the data for a Structure tile entity
 
* '''8''': Set the destination for a end gateway
 
* '''9''': Set the text on a sign
 
* '''10''': Unused
 
* '''11''': Declare a bed
 
* '''12''': Set data of a jigsaw block
 
* '''13''': Set items in a campfire
 
 
 
==== Block Action ====
 
 
 
This packet is used for a number of actions and animations performed by blocks, usually non-persistent.
 
 
 
See [[Block Actions]] for a list of values.
 
 
 
{{Warning2|This packet uses a block ID, not a block state. Unfortunately, block IDs are not directly included in the output from [[Data Generators]], but can manually be calculated.}}
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="4"| 0x0A
+
  | <code>minecraft.fly_one_cm</code>
|rowspan="4"| Play
+
  | 10
|rowspan="4"| Client
+
  | Distance
| Location
 
  | Position
 
  | Block coordinates
 
 
  |-
 
  |-
  | Action ID (Byte 1)
+
  | <code>minecraft.dive_one_cm</code>
  | Unsigned Byte
+
  | 11
  | Varies depending on block — see [[Block Actions]]
+
  | Distance
 
  |-
 
  |-
  | Action Param (Byte 2)
+
  | <code>minecraft.minecart_one_cm</code>
  | Unsigned Byte
+
  | 12
  | Varies depending on block — see [[Block Actions]]
+
  | Distance
 
  |-
 
  |-
  | Block Type
+
  | <code>minecraft.boat_one_cm</code>
| VarInt
+
  | 13
| The block type ID for the block.  This must match the block at the given coordinates.
+
  | Distance
  |}
 
 
 
==== Block Change ====
 
 
 
Fired whenever a block is changed within the render distance.
 
 
 
{{Warning2|Changing a block in a chunk that is not loaded is not a stable action.  The Notchian client currently uses a ''shared'' empty chunk which is modified for all block changes in unloaded chunks; while in 1.9 this chunk never renders in older versions the changed block will appear in all copies of the empty chunk. Servers should avoid sending block changes in unloaded chunks and clients should ignore such packets.}}
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x0B
+
  | <code>minecraft.pig_one_cm</code>
|rowspan="2"| Play
+
  | 14
|rowspan="2"| Client
+
  | Distance
| Location
 
  | Position
 
  | Block Coordinates
 
 
  |-
 
  |-
  | Block ID
+
  | <code>minecraft.horse_one_cm</code>
| VarInt
+
  | 15
| The new block state ID for the block as given in the {{Minecraft Wiki|Data values#Block IDs|global palette}}. See that section for more information.
+
  | Distance
  |}
 
 
 
==== Boss Bar ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
  !colspan="2"| Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="14"| 0x0C
+
  | <code>minecraft.aviate_one_cm</code>
|rowspan="14"| Play
+
  | 16
|rowspan="14"| Client
+
  | Distance
|colspan="2"| UUID
 
  | UUID
 
  | Unique ID for this bar
 
 
  |-
 
  |-
  |colspan="2"| Action
+
  | <code>minecraft.jump</code>
  | VarInt Enum
+
  | 17
  | Determines the layout of the remaining packet
+
  | None
 
  |-
 
  |-
  ! Action
+
  | <code>minecraft.drop</code>
  ! Field Name
+
  | 18
  !
+
  | None
!
 
 
  |-
 
  |-
  |rowspan="5"| 0: add
+
  | <code>minecraft.damage_dealt</code>
| Title
+
  | 19
  | [[Chat]]
+
  | Damage
  |  
 
 
  |-
 
  |-
  | Health
+
  | <code>minecraft.damage_taken</code>
  | Float
+
  | 20
  | From 0 to 1. Values greater than 1 do not crash a Notchian client, and start [https://i.johni0702.de/nA.png rendering part of a second health bar] at around 1.5.
+
  | Damage
 
  |-
 
  |-
  | Color
+
  | <code>minecraft.deaths</code>
  | VarInt Enum
+
  | 21
  | Color ID (see below)
+
  | None
 
  |-
 
  |-
  | Division
+
  | <code>minecraft.mob_kills</code>
  | VarInt Enum
+
  | 22
  | Type of division (see below)
+
  | None
 
  |-
 
  |-
  | Flags
+
  | <code>minecraft.animals_bred</code>
  | Unsigned Byte
+
  | 23
  | Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music), 0x04: create fog (previously was also controlled by 0x02)
+
  | None
 
  |-
 
  |-
  | 1: remove
+
  | <code>minecraft.player_kills</code>
  | ''no fields''
+
  | 24
  | ''no fields''
+
  | None
| Removes this boss bar
 
 
  |-
 
  |-
  | 2: update health
+
  | <code>minecraft.fish_caught</code>
  | Health
+
  | 25
  | Float
+
  | None
| as above
 
 
  |-
 
  |-
  | 3: update title
+
  | <code>minecraft.talked_to_villager</code>
  | Title
+
  | 26
| [[Chat]]
+
  | None
  |  
 
 
  |-
 
  |-
  |rowspan="2"| 4: update style
+
  | <code>minecraft.traded_with_villager</code>
| Color
+
  | 27
  | VarInt Enum
+
  | None
  | Color ID (see below)
 
 
  |-
 
  |-
  | Dividers
+
  | <code>minecraft.eat_cake_slice</code>
  | VarInt Enum
+
  | 28
  | as above
+
  | None
 
  |-
 
  |-
  | 5: update flags
+
  | <code>minecraft.fill_cauldron</code>
  | Flags
+
  | 29
  | Unsigned Byte
+
  | None
| as above
 
 
  |-
 
  |-
  |}
+
  | <code>minecraft.use_cauldron</code>
 
+
| 30
{| class="wikitable"
+
  | None
  ! ID
 
! Color
 
 
  |-
 
  |-
  | 0
+
  | <code>minecraft.clean_armor</code>
  | Pink
+
  | 31
 +
| None
 
  |-
 
  |-
  | 1
+
  | <code>minecraft.clean_banner</code>
  | Blue
+
  | 32
 +
| None
 
  |-
 
  |-
  | 2
+
  | <code>minecraft.interact_with_brewingstand</code>
  | Red
+
  | 33
 +
| None
 
  |-
 
  |-
  | 3
+
  | <code>minecraft.interact_with_beacon</code>
  | Green
+
  | 34
 +
| None
 
  |-
 
  |-
  | 4
+
  | <code>minecraft.inspect_dropper</code>
  | Yellow
+
  | 35
 +
| None
 
  |-
 
  |-
  | 5
+
  | <code>minecraft.inspect_hopper</code>
  | Purple
+
  | 36
 +
| None
 
  |-
 
  |-
  | 6
+
  | <code>minecraft.inspect_dispenser</code>
  | White
+
  | 37
  |}
+
  | None
 
 
{| class="wikitable"
 
! ID
 
! Type of division
 
 
  |-
 
  |-
  | 0
+
  | <code>minecraft.play_noteblock</code>
  | No division
+
  | 38
 +
| None
 
  |-
 
  |-
  | 1
+
  | <code>minecraft.tune_noteblock</code>
  | 6 notches
+
  | 39
 +
| None
 +
|-
 +
| <code>minecraft.pot_flower</code>
 +
| 40
 +
| None
 +
|-
 +
| <code>minecraft.trigger_trapped_chest</code>
 +
| 41
 +
| None
 +
|-
 +
| <code>minecraft.open_enderchest</code>
 +
| 42
 +
| None
 +
|-
 +
| <code>minecraft.enchant_item</code>
 +
| 43
 +
| None
 +
|-
 +
| <code>minecraft.play_record</code>
 +
| 44
 +
| None
 +
|-
 +
| <code>minecraft.interact_with_furnace</code>
 +
| 45
 +
| None
 +
|-
 +
| <code>minecraft.interact_with_crafting_table</code>
 +
| 46
 +
| None
 
  |-
 
  |-
  | 2
+
  | <code>minecraft.open_chest</code>
  | 10 notches
+
  | 47
 +
| None
 
  |-
 
  |-
  | 3
+
  | <code>minecraft.sleep_in_bed</code>
  | 12 notches
+
  | 48
 +
| None
 
  |-
 
  |-
  | 4
+
  | <code>minecraft.open_shulker_box</code>
  | 20 notches
+
  | 49
 +
| None
 
  |}
 
  |}
  
==== Server Difficulty ====
+
Units:
  
Changes the difficulty setting in the client's option menu
+
* None: just a normal number (formatted with 0 decimal places)
 +
* Damage: value is 10 times the normal amount
 +
* Distance: a distance in centimeters (hundredths of blocks)
 +
* Time: a time span in ticks
 +
 
 +
==== Acknowledge Player Digging ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,298: Line 1,300:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x0D
+
  |rowspan="4"| 0x07
  |rowspan="2"| Play
+
  |rowspan="4"| Play
  |rowspan="2"| Client
+
  |rowspan="4"| Client
  | Difficulty
+
  | Location
  | Unsigned Byte
+
| Position
  | 0: peaceful, 1: easy, 2: normal, 3: hard
+
  | Position where the digging was happening
 +
  |-
 +
| Block
 +
| VarInt
 +
| Block state ID of the block that should be at that position now.
 +
|-
 +
| Status
 +
| VarInt enum
 +
| Same as Player Digging.  Only Started digging (0), Cancelled digging (1), and Finished digging (2) are used.
 
  |-
 
  |-
  | Difficulty locked?
+
  | Successful
 
  | Boolean
 
  | Boolean
  |
+
  | True if the digging succeeded; false if the client should undo any changes it made locally.  (How does this work?)
 
  |}
 
  |}
  
==== Chat Message (clientbound) ====  
+
==== Block Break Animation ====
 +
 
 +
0–9 are the displayable destroy stages and each other number means that there is no animation on this coordinate.
  
Identifying the difference between Chat/System Message is important as it helps respect the user's chat visibility optionsSee [[Chat#Processing chat|processing chat]] for more info about these positions.
+
Block break animations can still be applied on air; the animation will remain visible although there is no block being brokenHowever, if this is applied to a transparent block, odd graphical effects may happen, including water losing its transparency. (An effect similar to this can be seen in normal gameplay when breaking ice blocks)
  
{{warning2|Game info accepts json formatting but does not display it, although the deprecated §-based formatting works. This is not an issue when using the [[#Title|Title]] packet, so prefer that packet for displaying information in that slot. See [https://bugs.mojang.com/browse/MC-119145 MC-119145] for more information.}}
+
If you need to display several break animations at the same time you have to give each of them a unique Entity ID. The entity ID does not need to correspond to an actual entity on the client. It is valid to use a randomly generated number.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,324: Line 1,336:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x0E
+
  |rowspan="3"| 0x08
  |rowspan="2"| Play
+
  |rowspan="3"| Play
  |rowspan="2"| Client
+
  |rowspan="3"| Client
  | JSON Data
+
  | Entity ID
  | [[Chat]]
+
  | VarInt
  | Limited to 32767 bytes
+
  | Entity ID of the entity breaking the block
 
  |-
 
  |-
 +
| Location
 
  | Position
 
  | Position
 +
| Block Position
 +
|-
 +
| Destroy Stage
 
  | Byte
 
  | Byte
  | 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar).
+
  | 0–9 to set it, any other value to remove it
 
  |}
 
  |}
  
==== Multi Block Change ====
+
==== Block Entity Data ====
  
Fired whenever 2 or more blocks are changed within the same chunk on the same tick.
+
Sets the block entity associated with the block at the given location.
 
 
{{Warning|Changing blocks in chunks not loaded by the client is unsafe (see note on [[#Block Change|Block Change]]).}}
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,346: Line 1,360:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| 0x0F
+
  |rowspan="3"| 0x09
  |rowspan="6"| Play
+
  |rowspan="3"| Play
  |rowspan="6"| Client
+
  |rowspan="3"| Client
  |colspan="2"| Chunk X
+
  | Location
  |colspan="2"| Int
+
  | Position
  | Chunk X coordinate
+
  |  
 
  |-
 
  |-
  |colspan="2"| Chunk Z
+
  | Action
|colspan="2"| Int
 
| Chunk Z coordinate
 
|-
 
|colspan="2"| Record Count
 
|colspan="2"| VarInt
 
| Number of elements in the following array, i.e. the number of blocks affected
 
|-
 
|rowspan="3"| Record
 
| Horizontal Position
 
|rowspan="3"| Array
 
 
  | Unsigned Byte
 
  | Unsigned Byte
  | The 4 most significant bits (<code>0xF0</code>) encode the X coordinate, relative to the chunk. The 4 least significant bits (<code>0x0F</code>) encode the Z coordinate, relative to the chunk.
+
  | The type of update to perform, see below
 
  |-
 
  |-
  | Y Coordinate
+
  | NBT Data
  | Unsigned Byte
+
  | [[NBT|NBT Tag]]
| Y coordinate of the block
+
  | Data to set. May be a TAG_END (0), in which case the block entity at the given location is removed (though this is not required since the client will remove the block entity automatically on chunk unload or block removal)
  |-
 
  | Block ID
 
| VarInt
 
| The new block state ID for the block as given in the {{Minecraft Wiki|Data values#Block IDs|global palette}}. See that section for more information.
 
 
  |}
 
  |}
  
To decode the position into a world position:
+
''Action'' field:
  
<syntaxhighlight lang="java">
+
* '''1''': Set data of a mob spawner (everything except for SpawnPotentials: current delay, min/max delay, mob to be spawned, spawn count, spawn range, etc.)
worldX = (horizPos >> 4 & 15) + (chunkX * 16);
+
* '''2''': Set command block text (command and last execution status)
worldY = vertPos;
+
* '''3''': Set the level, primary, and secondary powers of a beacon
worldZ = (horizPos & 15) + (chunkZ * 16);
+
* '''4''': Set rotation and skin of mob head
</syntaxhighlight>
+
* '''5''': Declare a conduit
 +
* '''6''': Set base color and patterns on a banner
 +
* '''7''': Set the data for a Structure tile entity
 +
* '''8''': Set the destination for a end gateway
 +
* '''9''': Set the text on a sign
 +
* '''10''': Unused
 +
* '''11''': Declare a bed
 +
* '''12''': Set data of a jigsaw block
 +
* '''13''': Set items in a campfire
 +
* '''14''': Behive information
  
==== Tab-Complete (clientbound) ====
+
==== Block Action ====
  
The server responds with a list of auto-completions of the last word sent to it. In the case of regular chat, this is a player username. Command names and parameters are also supported. The client sorts these alphabetically before listing them.
+
This packet is used for a number of actions and animations performed by blocks, usually non-persistent.
  
{| class="wikitable"
+
See [[Block Actions]] for a list of values.
 +
 
 +
{{Warning2|This packet uses a block ID, not a block state.  Unfortunately, block IDs are not directly included in the output from [[Data Generators]], but can manually be calculated.}}
 +
 
 +
{| class="wikitable"
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="8"| 0x10
+
  |rowspan="4"| 0x0A
  |rowspan="8"| Play
+
  |rowspan="4"| Play
  |rowspan="8"| Client
+
  |rowspan="4"| Client
 +
| Location
 +
| Position
 +
| Block coordinates
 
  |-
 
  |-
  |colspan="2"| ID
+
  | Action ID (Byte 1)
  |colspan="2"| VarInt
+
  | Unsigned Byte
  | Transaction ID
+
  | Varies depending on block — see [[Block Actions]]
 
  |-
 
  |-
  |colspan="2"| Start
+
  | Action Param (Byte 2)
  |colspan="2"| VarInt
+
  | Unsigned Byte
  | Start of the text to replace
+
  | Varies depending on block — see [[Block Actions]]
 
  |-
 
  |-
  |colspan="2"| Length
+
  | Block Type
  |colspan="2"| VarInt
+
  | VarInt
  | Length of the text to replace
+
  | The block type ID for the block. This must match the block at the given coordinates.
|-
 
|colspan="2"| Count
 
|colspan="2"| VarInt
 
  | Number of elements in the following array
 
|-
 
|rowspan="3"| Matches
 
| Match
 
|rowspan="3"| Array
 
| String (32767)
 
| One eligible value to insert, note that each command is sent separately instead of in a single string, hence the need for Count. Note that for instance this doesn't include a leading <code>/</code> on commands.
 
|-
 
| Has tooltip
 
| Boolean
 
| True if the following is present
 
|-
 
| Tooltip
 
| Optional [[Chat]]
 
| Tooltip to display; only present if previous boolean is true
 
 
  |}
 
  |}
  
==== Declare Commands ====
+
==== Block Change ====
  
Lists all of the commands on the server, and how they are parsed.
+
Fired whenever a block is changed within the render distance.
  
This is a directed graph, with one root nodeEach redirect or child node must refer only to nodes that have already been declared.
+
{{Warning2|Changing a block in a chunk that is not loaded is not a stable action.  The Notchian client currently uses a ''shared'' empty chunk which is modified for all block changes in unloaded chunks; while in 1.9 this chunk never renders in older versions the changed block will appear in all copies of the empty chunkServers should avoid sending block changes in unloaded chunks and clients should ignore such packets.}}
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,449: Line 1,447:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x11
+
  |rowspan="2"| 0x0B
  |rowspan="3"| Play
+
  |rowspan="2"| Play
  |rowspan="3"| Client
+
  |rowspan="2"| Client
  | Count
+
  | Location
  | VarInt
+
  | Position
  | Number of elements in the following array
+
  | Block Coordinates
 
  |-
 
  |-
  | Nodes
+
  | Block ID
| Array of [[Command Data|Node]]
 
| An array of nodes
 
|-
 
| Root index
 
 
  | VarInt
 
  | VarInt
  | Index of the <code>root</code> node in the previous array
+
  | The new block state ID for the block as given in the {{Minecraft Wiki|Data values#Block IDs|global palette}}. See that section for more information.
 
  |}
 
  |}
  
For more information on this packet, see the [[Command Data]] article.
+
==== Boss Bar ====  
 
 
==== Confirm Transaction (clientbound) ====
 
 
 
A packet from the server indicating whether a request from the client was accepted, or whether there was a conflict (due to lag).  If the packet was not accepted, the client must respond with a [[#Confirm Transaction (serverbound)|serverbound confirm transaction]] packet.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,475: Line 1,465:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x12
+
  |rowspan="14"| 0x0C
  |rowspan="3"| Play
+
  |rowspan="14"| Play
  |rowspan="3"| Client
+
  |rowspan="14"| Client
  | Window ID
+
  |colspan="2"| UUID
  | Byte
+
  | UUID
  | The ID of the window that the action occurred in
+
  | Unique ID for this bar
 
  |-
 
  |-
  | Action Number
+
  |colspan="2"| Action
  | Short
+
  | VarInt Enum
  | Every action that is to be accepted has a unique number. This number is an incrementing integer (starting at 0) with separate counts for each window ID.
+
  | Determines the layout of the remaining packet
 
  |-
 
  |-
| Accepted
+
  ! Action
| Boolean
+
  ! Field Name
| Whether the action was accepted
+
  !  
|}
+
  !  
 
 
==== Close Window (clientbound) ====
 
 
 
This packet is sent from the server to the client when a window is forcibly closed, such as when a chest is destroyed while it's open.
 
 
 
{| class="wikitable"
 
! Packet ID
 
  ! State
 
! Bound To
 
  ! Field Name
 
  ! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  | 0x13
+
  |rowspan="5"| 0: add
| Play
+
  | Title
  | Client
+
  | [[Chat]]
  | Window ID
+
|  
| Unsigned Byte
 
| This is the ID of the window that was closed. 0 for inventory.
 
|}
 
 
 
==== Window Items ====
 
[[File:Inventory-slots.png|thumb|The inventory slots]]
 
 
 
Sent by the server when items in multiple slots (in a window) are added/removed. This includes the main inventory, equipped armour and crafting slots.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x14
+
  | Health
  |rowspan="3"| Play
+
  | Float
  |rowspan="3"| Client
+
  | From 0 to 1. Values greater than 1 do not crash a Notchian client, and start [https://i.johni0702.de/nA.png rendering part of a second health bar] at around 1.5.
| Window ID
 
| Unsigned Byte
 
| The ID of window which items are being sent for. 0 for player inventory.
 
 
  |-
 
  |-
  | Count
+
  | Color
  | Short
+
  | VarInt Enum
  | Number of elements in the following array
+
  | Color ID (see below)
 
  |-
 
  |-
  | Slot Data
+
  | Division
  | Array of [[Slot Data|Slot]]
+
  | VarInt Enum
  |  
+
  | Type of division (see below)
|}
 
 
 
See [[Inventory#Windows|inventory windows]] for further information about how slots are indexed.
 
 
 
==== Window Property ====
 
 
 
This packet is used to inform the client that part of a GUI window should be updated.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x15
+
  | Flags
|rowspan="3"| Play
 
|rowspan="3"| Client
 
| Window ID
 
 
  | Unsigned Byte
 
  | Unsigned Byte
  |  
+
  | Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music), 0x04: create fog (previously was also controlled by 0x02)
 
  |-
 
  |-
  | Property
+
  | 1: remove
  | Short
+
  | ''no fields''
  | The property to be updated, see below
+
  | ''no fields''
 +
| Removes this boss bar
 
  |-
 
  |-
  | Value
+
  | 2: update health
  | Short
+
  | Health
  | The new value for the property, see below
+
  | Float
  |}
+
  | as above
 
 
The meaning of the Property field depends on the type of the window. The following table shows the known combinations of window type and property, and how the value is to be interpreted.
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
  ! Window type
+
  | 3: update title
  ! Property
+
  | Title
  ! Value
+
  | [[Chat]]
 +
|
 
  |-
 
  |-
  |rowspan="4"| Furnace
+
  |rowspan="2"| 4: update style
  | 0: Fire icon (fuel left)
+
| Color
  | counting from fuel burn time down to 0 (in-game ticks)
+
  | VarInt Enum
 +
  | Color ID (see below)
 
  |-
 
  |-
  | 1: Maximum fuel burn time
+
  | Dividers
  | fuel burn time or 0 (in-game ticks)
+
  | VarInt Enum
 +
| as above
 
  |-
 
  |-
  | 2: Progress arrow
+
  | 5: update flags
  | counting from 0 to maximum progress (in-game ticks)
+
  | Flags
 +
| Unsigned Byte
 +
| as above
 
  |-
 
  |-
  | 3: Maximum progress
+
  |}
  | always 200 on the notchian server
+
 
 +
{| class="wikitable"
 +
! ID
 +
  ! Color
 
  |-
 
  |-
|rowspan="10"| Enchantment Table
+
  | 0
  | 0: Level requirement for top enchantment slot
+
  | Pink
  |rowspan="3"| The enchantment's xp level requirement
 
 
  |-
 
  |-
  | 1: Level requirement for middle enchantment slot
+
  | 1
 +
| Blue
 
  |-
 
  |-
  | 2: Level requirement for bottom enchantment slot
+
  | 2
 +
| Red
 
  |-
 
  |-
  | 3: The enchantment seed
+
  | 3
  | Used for drawing the enchantment names (in [[Wikipedia:Standard Galactic Alphabet|SGA]]) clientside.  The same seed ''is'' used to calculate enchantments, but some of the data isn't sent to the client to prevent easily guessing the entire list (the seed value here is the regular seed bitwise and <code>0xFFFFFFF0</code>).
+
  | Green
 
  |-
 
  |-
  | 4: Enchantment ID shown on mouse hover over top enchantment slot
+
  | 4
  |rowspan="3"| The enchantment id (set to -1 to hide it), see below for values
+
  | Yellow
 
  |-
 
  |-
  | 5: Enchantment ID shown on mouse hover over middle enchantment slot
+
  | 5
 +
| Purple
 
  |-
 
  |-
  | 6: Enchantment ID shown on mouse hover over bottom enchantment slot
+
  | 6
 +
| White
 +
|}
 +
 
 +
{| class="wikitable"
 +
! ID
 +
! Type of division
 
  |-
 
  |-
  | 7: Enchantment level shown on mouse hover over the top slot
+
  | 0
  |rowspan="3"| The enchantment level (1 = I, 2 = II, 6 = VI, etc.), or -1 if no enchant
+
  | No division
 
  |-
 
  |-
  | 8: Enchantment level shown on mouse hover over the middle slot
+
  | 1
 +
| 6 notches
 
  |-
 
  |-
  | 9: Enchantment level shown on mouse hover over the bottom slot
+
  | 2
 +
| 10 notches
 
  |-
 
  |-
  |rowspan="3"| Beacon
+
  | 3
| 0: Power level
+
  | 12 notches
  | 0-4, controls what effect buttons are enabled
 
 
  |-
 
  |-
  | 1: First potion effect
+
  | 4
  | {{Minecraft Wiki|Data values#Status effects|Potion effect ID}} for the first effect, or -1 if no effect
+
  | 20 notches
|-
 
| 2: Second potion effect
 
| {{Minecraft Wiki|Data values#Status effects|Potion effect ID}} for the second effect, or -1 if no effect
 
|-
 
| Anvil
 
| 0: Repair cost
 
| The repair's cost in xp levels
 
|-
 
|rowspan="2"| Brewing Stand
 
| 0: Brew time
 
| 0 – 400, with 400 making the arrow empty, and 0 making the arrow full
 
|-
 
| 1: Fuel time
 
| 0 - 20, with 0 making the arrow empty, and 20 making the arrow full
 
 
  |}
 
  |}
  
For an enchanting table, the following numerical IDs are used:
+
==== Server Difficulty ====
 +
 
 +
Changes the difficulty setting in the client's option menu
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Numerical ID
+
  ! Packet ID
  ! Enchantment ID
+
  ! State
  ! Enchantment Name
+
! Bound To
 +
  ! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 0
+
  |rowspan="2"| 0x0D
  | minecraft:protection
+
|rowspan="2"| Play
  | Protection
+
|rowspan="2"| Client
 +
| Difficulty
 +
  | Unsigned Byte
 +
  | 0: peaceful, 1: easy, 2: normal, 3: hard
 
  |-
 
  |-
  | 1
+
  | Difficulty locked?
  | minecraft:fire_protection
+
  | Boolean
  | Fire Protection
+
|
 +
|}
 +
 
 +
==== Chat Message (clientbound) ====
 +
 
 +
Identifying the difference between Chat/System Message is important as it helps respect the user's chat visibility options.  See [[Chat#Processing chat|processing chat]] for more info about these positions.
 +
 
 +
{{warning2|Game info accepts json formatting but does not display it, although the deprecated §-based formatting works.  This is not an issue when using the [[#Title|Title]] packet, so prefer that packet for displaying information in that slot.  See [https://bugs.mojang.com/browse/MC-119145 MC-119145] for more information.}}
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
  ! Notes
 
  |-
 
  |-
  | 2
+
  |rowspan="3"| 0x0E
  | minecraft:feather_falling
+
|rowspan="3"| Play
  | Feather Falling
+
|rowspan="3"| Client
 +
| JSON Data
 +
  | [[Chat]]
 +
  | Limited to 32767 bytes
 
  |-
 
  |-
  | 3
+
  | Position
  | minecraft:blast_protection
+
  | Byte
  | Blast Protection
+
  | 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar).
 
  |-
 
  |-
  | 4
+
  | Sender
  | minecraft:projectile_protection
+
  | UUID
  | Projectile Protection
+
  | Used by the Notchian client for the disableChat launch option. Setting both longs to 0 will always display the message regardless of the setting.
 +
|}
 +
 
 +
==== Tab-Complete (clientbound) ====
 +
 
 +
The server responds with a list of auto-completions of the last word sent to it. In the case of regular chat, this is a player username. Command names and parameters are also supported. The client sorts these alphabetically before listing them.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
!colspan="2"| Field Name
 +
!colspan="2"| Field Type
 +
! Notes
 
  |-
 
  |-
  | 5
+
  |rowspan="8"| 0xF
  | minecraft:respiration
+
  |rowspan="8"| Play
  | Respiration
+
  |rowspan="8"| Client
 
  |-
 
  |-
  | 6
+
  |colspan="2"| ID
  | minecraft:aqua_affinity
+
  |colspan="2"| VarInt
  | Aqua Affinity
+
  | Transaction ID
 
  |-
 
  |-
  | 7
+
  |colspan="2"| Start
  | minecraft:thorns
+
  |colspan="2"| VarInt
  | Thorns
+
  | Start of the text to replace
 
  |-
 
  |-
  | 8
+
  |colspan="2"| Length
  | minecraft:depth_strider
+
  |colspan="2"| VarInt
  | Depth Strider
+
  | Length of the text to replace
 
  |-
 
  |-
  | 9
+
  |colspan="2"| Count
  | minecraft:frost_walker
+
  |colspan="2"| VarInt
  | Frost Walker
+
  | Number of elements in the following array
 
  |-
 
  |-
  | 10
+
  |rowspan="3"| Matches
  | minecraft:binding_curse
+
  | Match
  | Curse of Binding
+
  |rowspan="3"| Array
 +
| String (32767)
 +
| One eligible value to insert, note that each command is sent separately instead of in a single string, hence the need for Count.  Note that for instance this doesn't include a leading <code>/</code> on commands.
 
  |-
 
  |-
  | 11
+
  | Has tooltip
  | minecraft:sharpness
+
  | Boolean
  | Sharpness
+
  | True if the following is present
 
  |-
 
  |-
  | 12
+
  | Tooltip
  | minecraft:smite
+
  | Optional [[Chat]]
  | Smite
+
  | Tooltip to display; only present if previous boolean is true
  |-
+
  |}
  | 13
+
 
  | minecraft:bane_of_arthropods
+
==== Declare Commands ====
  | Bane of Arthropods
+
 
 +
Lists all of the commands on the server, and how they are parsed.
 +
 
 +
This is a directed graph, with one root node. Each redirect or child node must refer only to nodes that have already been declared.
 +
 
 +
{| class="wikitable"
 +
  ! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
  ! Notes
 
  |-
 
  |-
  | 14
+
  |rowspan="3"| 0x10
  | minecraft:knockback
+
|rowspan="3"| Play
  | Knockback
+
|rowspan="3"| Client
 +
| Count
 +
  | VarInt
 +
  | Number of elements in the following array
 
  |-
 
  |-
  | 15
+
  | Nodes
  | minecraft:fire_aspect
+
  | Array of [[Command Data|Node]]
  | Fire Aspect
+
  | An array of nodes
 
  |-
 
  |-
  | 16
+
  | Root index
  | minecraft:looting
+
  | VarInt
  | Looting
+
  | Index of the <code>root</code> node in the previous array
 +
|}
 +
 
 +
For more information on this packet, see the [[Command Data]] article.
 +
 
 +
==== Window Confirmation (clientbound) ====
 +
 
 +
A packet from the server indicating whether a request from the client was accepted, or whether there was a conflict (due to lag).  If the packet was not accepted, the client must respond with a [[#Window Confirmation (serverbound)|serverbound window confirmation]] packet.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 17
+
  |rowspan="3"| 0x11
  | minecraft:sweeping
+
|rowspan="3"| Play
  | Sweeping Edge
+
|rowspan="3"| Client
 +
| Window ID
 +
  | Byte
 +
  | The ID of the window that the action occurred in
 
  |-
 
  |-
  | 18
+
  | Action Number
  | minecraft:efficiency
+
  | Short
  | Efficiency
+
  | Every action that is to be accepted has a unique number. This number is an incrementing integer (starting at 0) with separate counts for each window ID.
 
  |-
 
  |-
  | 19
+
  | Accepted
  | minecraft:silk_touch
+
  | Boolean
  | Silk Touch
+
  | Whether the action was accepted
 +
|}
 +
 
 +
==== Close Window (clientbound) ====
 +
 
 +
This packet is sent from the server to the client when a window is forcibly closed, such as when a chest is destroyed while it's open.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 20
+
  | 0x12
  | minecraft:unbreaking
+
  | Play
  | Unbreaking
+
| Client
 +
| Window ID
 +
| Unsigned Byte
 +
| This is the ID of the window that was closed. 0 for inventory.
 +
|}
 +
 
 +
==== Window Items ====
 +
[[File:Inventory-slots.png|thumb|The inventory slots]]
 +
 
 +
Sent by the server when items in multiple slots (in a window) are added/removed. This includes the main inventory, equipped armour and crafting slots.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
  ! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 21
+
  |rowspan="3"| 0x13
  | minecraft:fortune
+
  |rowspan="3"| Play
  | Fortune
+
  |rowspan="3"| Client
|-
+
  | Window ID
  | 22
+
  | Unsigned Byte
  | minecraft:power
+
  | The ID of window which items are being sent for. 0 for player inventory.
  | Power
 
 
  |-
 
  |-
  | 23
+
  | Count
  | minecraft:punch
+
  | Short
  | Punch
+
  | Number of elements in the following array
 
  |-
 
  |-
  | 24
+
  | Slot Data
  | minecraft:flame
+
| Array of [[Slot Data|Slot]]
  | Flame
+
  |  
 +
  |}
 +
 
 +
See [[Inventory#Windows|inventory windows]] for further information about how slots are indexed.
 +
 
 +
==== Window Property ====
 +
 
 +
This packet is used to inform the client that part of a GUI window should be updated.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 25
+
  |rowspan="3"| 0x14
  | minecraft:infinity
+
|rowspan="3"| Play
  | Infinity
+
|rowspan="3"| Client
 +
| Window ID
 +
  | Unsigned Byte
 +
  |  
 
  |-
 
  |-
  | 26
+
  | Property
  | minecraft:luck_of_the_sea
+
  | Short
  | Luck of the Sea
+
  | The property to be updated, see below
 
  |-
 
  |-
  | 27
+
  | Value
  | minecraft:lure
+
  | Short
  | Lure
+
  | The new value for the property, see below
 +
|}
 +
 
 +
The meaning of the Property field depends on the type of the window. The following table shows the known combinations of window type and property, and how the value is to be interpreted.
 +
 
 +
{| class="wikitable"
 +
|-
 +
! Window type
 +
! Property
 +
! Value
 
  |-
 
  |-
  | 28
+
  |rowspan="4"| Furnace
  | minecraft:loyalty
+
  | 0: Fire icon (fuel left)
  | Loyalty
+
  | counting from fuel burn time down to 0 (in-game ticks)
 
  |-
 
  |-
  | 29
+
  | 1: Maximum fuel burn time
| minecraft:impaling
+
  | fuel burn time or 0 (in-game ticks)
  | Impaling
 
 
  |-
 
  |-
  | 30
+
  | 2: Progress arrow
| minecraft:riptide
+
  | counting from 0 to maximum progress (in-game ticks)
  | Riptide
 
 
  |-
 
  |-
  | 31
+
  | 3: Maximum progress
| minecraft:channeling
+
  | always 200 on the notchian server
  | Channeling
 
 
  |-
 
  |-
  | 32
+
  |rowspan="10"| Enchantment Table
  | minecraft:mending
+
  | 0: Level requirement for top enchantment slot
  | Mending
+
  |rowspan="3"| The enchantment's xp level requirement
 
  |-
 
  |-
  | 33
+
  | 1: Level requirement for middle enchantment slot
| minecraft:vanishing_curse
 
| Curse of Vanishing
 
|}
 
 
 
==== Set Slot ====
 
 
 
Sent by the server when an item in a slot (in a window) is added/removed.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x16
+
| 2: Level requirement for bottom enchantment slot
  |rowspan="3"| Play
+
|-
  |rowspan="3"| Client
+
| 3: The enchantment seed
  | Window ID
+
| Used for drawing the enchantment names (in [[Wikipedia:Standard Galactic Alphabet|SGA]]) clientside.  The same seed ''is'' used to calculate enchantments, but some of the data isn't sent to the client to prevent easily guessing the entire list (the seed value here is the regular seed bitwise and <code>0xFFFFFFF0</code>).
  | Byte
+
|-
  | The window which is being updated. 0 for player inventory. Note that all known window types include the player inventory. This packet will only be sent for the currently opened window while the player is performing actions, even if it affects the player inventory. After the window is closed, a number of these packets are sent to update the player's inventory window (0).
+
| 4: Enchantment ID shown on mouse hover over top enchantment slot
 +
  |rowspan="3"| The enchantment id (set to -1 to hide it), see below for values
 +
|-
 +
| 5: Enchantment ID shown on mouse hover over middle enchantment slot
 +
|-
 +
| 6: Enchantment ID shown on mouse hover over bottom enchantment slot
 +
|-
 +
| 7: Enchantment level shown on mouse hover over the top slot
 +
  |rowspan="3"| The enchantment level (1 = I, 2 = II, 6 = VI, etc.), or -1 if no enchant
 +
|-
 +
| 8: Enchantment level shown on mouse hover over the middle slot
 +
|-
 +
| 9: Enchantment level shown on mouse hover over the bottom slot
 +
|-
 +
  |rowspan="3"| Beacon
 +
| 0: Power level
 +
  | 0-4, controls what effect buttons are enabled
 +
|-
 +
  | 1: First potion effect
 +
  | {{Minecraft Wiki|Data values#Status effects|Potion effect ID}} for the first effect, or -1 if no effect
 +
|-
 +
| 2: Second potion effect
 +
| {{Minecraft Wiki|Data values#Status effects|Potion effect ID}} for the second effect, or -1 if no effect
 +
|-
 +
| Anvil
 +
| 0: Repair cost
 +
| The repair's cost in xp levels
 +
|-
 +
|rowspan="2"| Brewing Stand
 +
| 0: Brew time
 +
| 0 – 400, with 400 making the arrow empty, and 0 making the arrow full
 +
|-
 +
| 1: Fuel time
 +
| 0 - 20, with 0 making the arrow empty, and 20 making the arrow full
 
  |-
 
  |-
  | Slot
+
  | Stonecutter
  | Short
+
  | 0: Selected recipe
  | The slot that should be updated
+
  | The index of the selected recipe. -1 means none is selected.
 
  |-
 
  |-
  | Slot Data
+
  | Loom
  | [[Slot Data|Slot]]
+
  | 0: Selected pattern
  |  
+
  | The index of the selected pattern. 0 means none is selected, 0 is also the internal id of the "base" pattern.
 
  |}
 
  |}
  
To set the cursor (the item currently dragged with the mouse), use -1 as Window ID and as Slot.
+
For an enchanting table, the following numerical IDs are used:
  
This packet can only be used to edit the hotbar of the player's inventory if window ID is set to 0 (slots 36 through 44).  If the window ID is set to -2, then any slot in the inventory can be used but no add item animation will be played.
+
{| class="wikitable"
 
+
  ! Numerical ID
==== Set Cooldown ====
+
  ! Enchantment ID
 
+
  ! Enchantment Name
Applies a cooldown period to all items with the given type.  Used by the Notchian server with enderpearls.  This packet should be sent when the cooldown starts and also when the cooldown ends (to compensate for lag), although the client will end the cooldown automatically. Can be applied to any item, note that interactions still get sent to the server with the item but the client does not play the animation nor attempt to predict results (i.e block placing).
+
  |-
 
+
| 0
{| class="wikitable"
+
  | minecraft:protection
  ! Packet ID
+
  | Protection
  ! State
 
  ! Bound To
 
  ! Field Name
 
  ! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x17
+
  | 1
|rowspan="2"| Play
+
  | minecraft:fire_protection
|rowspan="2"| Client
+
  | Fire Protection
| Item ID
 
  | VarInt
 
  | Numeric ID of the item to apply a cooldown to.
 
 
  |-
 
  |-
  | Cooldown Ticks
+
  | 2
  | VarInt
+
  | minecraft:feather_falling
| Number of ticks to apply a cooldown for, or 0 to clear the cooldown.
+
| Feather Falling
|}
 
 
 
==== Plugin Message (clientbound) ====
 
 
 
{{Main|Plugin channels}}
 
 
 
Mods and plugins can use this to send their data. Minecraft itself uses several [[plugin channel]]s. These internal channels are in the <code>minecraft</code> namespace.
 
 
 
More documentation on this: [http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/ http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/]
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x18
+
  | 3
|rowspan="2"| Play
+
  | minecraft:blast_protection
|rowspan="2"| Client
+
  | Blast Protection
| Channel
 
  | Identifier
 
  | Name of the [[plugin channel]] used to send the data
 
 
  |-
 
  |-
  | Data
+
  | 4
  | Byte Array
+
  | minecraft:projectile_protection
| Any data, depending on the channel. <code>minecraft:</code> channels are documented [[plugin channel|here]].  The length of this array must be inferred from the packet length.
+
  | Projectile Protection
  |}
 
 
 
==== Named Sound Effect ====
 
{{See also|#Sound Effect}}
 
 
 
Used to play a sound effect on the client. Custom sounds may be added by resource packs.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="7"| 0x19
+
  | 5
  |rowspan="7"| Play
+
  | minecraft:respiration
|rowspan="7"| Client
+
  | Respiration
| Sound Name
 
  | Identifier
 
| All sound effect names as of 1.14.4 can be seen [https://pokechu22.github.io/Burger/1.14.4.html#sounds here].
 
 
  |-
 
  |-
  | Sound Category
+
  | 6
  | VarInt Enum
+
  | minecraft:aqua_affinity
  | The category that this sound will be played from ([https://gist.github.com/konwboj/7c0c380d3923443e9d55 current categories])
+
  | Aqua Affinity
 
  |-
 
  |-
  | Effect Position X
+
  | 7
  | Int
+
  | minecraft:thorns
  | Effect X multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
+
  | Thorns
 
  |-
 
  |-
  | Effect Position Y
+
  | 8
  | Int
+
  | minecraft:depth_strider
  | Effect Y multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
+
  | Depth Strider
 
  |-
 
  |-
  | Effect Position Z
+
  | 9
  | Int
+
  | minecraft:frost_walker
  | Effect Z multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
+
  | Frost Walker
 
  |-
 
  |-
  | Volume
+
  | 10
  | Float
+
  | minecraft:binding_curse
  | 1 is 100%, can be more
+
  | Curse of Binding
 
  |-
 
  |-
  | Pitch
+
  | 11
  | Float
+
  | minecraft:sharpness
  | Float between 0.5 and 2.0 by Notchian clients
+
  | Sharpness
|}
 
 
 
==== Disconnect (play) ====
 
 
 
Sent by the server before it disconnects a client. The client assumes that the server has already closed the connection by the time the packet arrives.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  | 0x1A
+
  | 12
  | Play
+
  | minecraft:smite
  | Client
+
  | Smite
| Reason
 
| [[Chat]]
 
| Displayed to the client when the connection terminates.
 
|}
 
 
 
==== Entity Status ====
 
 
 
Entity statuses generally trigger an animation for an entity.  The available statuses vary by the entity's type (and are available to subclasses of that type as well).
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x1B
+
  | 13
|rowspan="2"| Play
+
  | minecraft:bane_of_arthropods
|rowspan="2"| Client
+
  | Bane of Arthropods
| Entity ID
 
  | Int
 
  |  
 
 
  |-
 
  |-
  | Entity Status
+
  | 14
  | Byte Enum
+
  | minecraft:knockback
  | See below
+
  | Knockback
|}
 
 
 
See [[Entity statuses]] for a list of which statuses are valid for each type of entity.
 
 
 
==== Explosion ====
 
 
 
Sent when an explosion occurs (creepers, TNT, and ghast fireballs).
 
 
 
Each block in Records is set to air. Coordinates for each axis in record is int(X) + record.x
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="9"| 0x1C
+
  | 15
|rowspan="9"| Play
+
  | minecraft:fire_aspect
|rowspan="9"| Client
+
  | Fire Aspect
| X
 
  | Float
 
  |  
 
 
  |-
 
  |-
  | Y
+
  | 16
  | Float
+
  | minecraft:looting
  |  
+
  | Looting
 
  |-
 
  |-
  | Z
+
  | 17
  | Float
+
  | minecraft:sweeping
  |  
+
  | Sweeping Edge
 
  |-
 
  |-
  | Radius
+
  | 18
  | Float
+
  | minecraft:efficiency
  | Currently unused in the client
+
  | Efficiency
 
  |-
 
  |-
  | Record Count
+
  | 19
  | Int
+
  | minecraft:silk_touch
  | Number of elements in the following array
+
  | Silk Touch
 +
|-
 +
| 20
 +
| minecraft:unbreaking
 +
| Unbreaking
 
  |-
 
  |-
  | Records
+
  | 21
  | Array of (Byte, Byte, Byte)
+
  | minecraft:fortune
  | Each record is 3 signed bytes long, each bytes are the XYZ (respectively) offsets of affected blocks.
+
  | Fortune
 
  |-
 
  |-
  | Player Motion X
+
  | 22
  | Float
+
  | minecraft:power
  | X velocity of the player being pushed by the explosion
+
  | Power
 
  |-
 
  |-
  | Player Motion Y
+
  | 23
  | Float
+
  | minecraft:punch
  | Y velocity of the player being pushed by the explosion
+
  | Punch
 
  |-
 
  |-
  | Player Motion Z
+
  | 24
  | Float
+
  | minecraft:flame
  | Z velocity of the player being pushed by the explosion
+
  | Flame
|}
 
 
 
==== Unload Chunk ====
 
 
 
Tells the client to unload a chunk column.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x1D
+
  | 25
|rowspan="2"| Play
+
  | minecraft:infinity
|rowspan="2"| Client
+
  | Infinity
| Chunk X
 
  | Int
 
  | Block coordinate divided by 16, rounded down
 
 
  |-
 
  |-
  | Chunk Z
+
  | 26
  | Int
+
  | minecraft:luck_of_the_sea
  | Block coordinate divided by 16, rounded down
+
  | Luck of the Sea
 +
|-
 +
| 27
 +
| minecraft:lure
 +
| Lure
 +
|-
 +
| 28
 +
| minecraft:loyalty
 +
| Loyalty
 +
|-
 +
| 29
 +
| minecraft:impaling
 +
| Impaling
 +
|-
 +
| 30
 +
| minecraft:riptide
 +
| Riptide
 +
|-
 +
| 31
 +
| minecraft:channeling
 +
| Channeling
 +
|-
 +
| 32
 +
| minecraft:mending
 +
| Mending
 +
|-
 +
| 33
 +
| minecraft:vanishing_curse
 +
| Curse of Vanishing
 
  |}
 
  |}
  
It is legal to send this packet even if the given chunk is not currently loaded.
+
==== Set Slot ====
  
==== Change Game State ====
+
Sent by the server when an item in a slot (in a window) is added/removed.
 
 
Used for a wide variety of game state things, from whether to bed use to gamemode to demo messages.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,053: Line 2,055:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x1E
+
  |rowspan="3"| 0x15
  |rowspan="2"| Play
+
  |rowspan="3"| Play
  |rowspan="2"| Client
+
  |rowspan="3"| Client
  | Reason
+
  | Window ID
  | Unsigned Byte
+
  | Byte
  | See below
+
  | The window which is being updated. 0 for player inventory. Note that all known window types include the player inventory. This packet will only be sent for the currently opened window while the player is performing actions, even if it affects the player inventory. After the window is closed, a number of these packets are sent to update the player's inventory window (0).
 
  |-
 
  |-
  | Value
+
  | Slot
  | Float
+
  | Short
  | Depends on Reason
+
| The slot that should be updated
 +
|-
 +
| Slot Data
 +
| [[Slot Data|Slot]]
 +
  |  
 
  |}
 
  |}
  
''Reason codes'':
+
To set the cursor (the item currently dragged with the mouse), use -1 as Window ID and as Slot.
  
{| class="wikitable"
+
This packet can only be used to edit the hotbar of the player's inventory if window ID is set to 0 (slots 36 through 44).  If the window ID is set to -2, then any slot in the inventory can be used but no add item animation will be played.
! Reason
 
! Effect
 
! Value
 
|-
 
| 0
 
| Invalid Bed
 
| Would be used to switch between messages, but the only used message is 0 for invalid bed
 
|-
 
| 1
 
| Begin raining
 
|
 
|-
 
| 2
 
| End raining
 
|
 
|-
 
| 3
 
| Change gamemode
 
| 0: Survival, 1: Creative, 2: Adventure, 3: Spectator
 
|-
 
| 4
 
| Exit end
 
| 0: Immediately send Client Status of respawn without showing end credits; 1: Show end credits and respawn at the end (or when esc is pressed).  1 is sent if the player has not yet received the "The end?" advancement, while if they do have it 0 is used.
 
|-
 
| 5
 
| Demo message
 
| 0: Show welcome to demo screen, 101: Tell movement controls, 102: Tell jump control, 103: Tell inventory control, 104: Tell that the demo is over and print a message about how to take a screenshot
 
|-
 
| 6
 
| Arrow hitting player
 
| Appears to be played when an arrow strikes another player in Multiplayer
 
|-
 
| 7
 
| Fade value
 
| The current darkness value. 1 = Dark, 0 = Bright, Setting the value higher causes the game to change color and freeze
 
|-
 
| 8
 
| Fade time
 
| Time in ticks for the sky to fade
 
|-
 
| 9
 
| Play pufferfish sting sound
 
|-
 
| 10
 
| Play elder guardian mob appearance (effect and sound)
 
|
 
|}
 
  
==== Open Horse Window ====
+
==== Set Cooldown ====
  
This packet is used exclusively for opening the horse GUI. [[#Open Window|Open Window]] is used for all other GUIs.
+
Applies a cooldown period to all items with the given type.  Used by the Notchian server with enderpearls.  This packet should be sent when the cooldown starts and also when the cooldown ends (to compensate for lag), although the client will end the cooldown automatically. Can be applied to any item, note that interactions still get sent to the server with the item but the client does not play the animation nor attempt to predict results (i.e block placing).
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,128: Line 2,087:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x1F
+
  |rowspan="2"| 0x16
  |rowspan="3"| Play
+
  |rowspan="2"| Play
  |rowspan="3"| Client
+
  |rowspan="2"| Client
  | Window ID?
+
  | Item ID
  | Byte
+
  | VarInt
  |
+
  | Numeric ID of the item to apply a cooldown to.
 
  |-
 
  |-
  | Number of slots?
+
  | Cooldown Ticks
 
  | VarInt
 
  | VarInt
  |
+
  | Number of ticks to apply a cooldown for, or 0 to clear the cooldown.
|-
 
| Entity ID?
 
| Integer
 
|
 
 
  |}
 
  |}
  
==== Keep Alive (clientbound) ====
+
==== Plugin Message (clientbound) ====
 +
 
 +
{{Main|Plugin channels}}
  
The server will frequently send out a keep-alive, each containing a random ID. The client must respond with the same packet. If the client does not respond to them for over 30 seconds, the server kicks the client. Vice versa, if the server does not send any keep-alives for 20 seconds, the client will disconnect and yields a "Timed out" exception.
+
Mods and plugins can use this to send their data. Minecraft itself uses several [[plugin channel]]s. These internal channels are in the <code>minecraft</code> namespace.
  
The Notchian server uses a system-dependent time in milliseconds to generate the keep alive ID value.
+
More documentation on this: [http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/ http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/]
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,158: Line 2,115:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x20
+
  |rowspan="2"| 0x17
  |rowspan="1"| Play
+
  |rowspan="2"| Play
  |rowspan="1"| Client
+
  |rowspan="2"| Client
  | Keep Alive ID
+
  | Channel
  | Long
+
  | Identifier
  |  
+
  | Name of the [[plugin channel]] used to send the data
 +
|-
 +
| Data
 +
| Byte Array
 +
| Any data, depending on the channel. <code>minecraft:</code> channels are documented [[plugin channel|here]].  The length of this array must be inferred from the packet length.
 
  |}
 
  |}
  
==== Chunk Data ====
+
==== Named Sound Effect ====
{{Main|Chunk Format}}
+
{{See also|#Sound Effect}}
{{See also|#Unload Chunk}}
 
  
The server only sends skylight information for chunk pillars in the {{Minecraft Wiki|Overworld}}, it's up to the client to know in which dimenison the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent. This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with [[#Update Block Entity|Update Block Entity]] later).
+
Used to play a sound effect on the client. Custom sounds may be added by resource packs.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,180: Line 2,140:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="9"| 0x21
+
  |rowspan="7"| 0x18
  |rowspan="9"| Play
+
  |rowspan="7"| Play
  |rowspan="9"| Client
+
  |rowspan="7"| Client
  | Chunk X
+
  | Sound Name
  | Int
+
  | Identifier
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | All sound effect names as of 1.16.3 can be seen [https://pokechu22.github.io/Burger/1.16.3.html#sounds here].
 
  |-
 
  |-
  | Chunk Z
+
  | Sound Category
 +
| VarInt Enum
 +
| The category that this sound will be played from ([https://gist.github.com/konwboj/7c0c380d3923443e9d55 current categories])
 +
|-
 +
| Effect Position X
 
  | Int
 
  | Int
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | Effect X multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
 
  |-
 
  |-
  | Full chunk
+
  | Effect Position Y
  | Boolean
+
  | Int
  | See [[Chunk Format#Full chunk|Chunk Format]]
+
  | Effect Y multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
 
  |-
 
  |-
  | Primary Bit Mask
+
  | Effect Position Z
  | VarInt
+
  | Int
  | Bitmask with bits set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15).
+
  | Effect Z multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
 
  |-
 
  |-
  | Heightmaps
+
  | Volume
  | [[NBT]]
+
  | Float
  | Compound containing one long array named <code>MOTION_BLOCKING</code>, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a <code>WORLD_SURFACE</code> long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
+
  | 1 is 100%, can be more
|-
 
| Size
 
| VarInt
 
| Size of Data in bytes
 
 
  |-
 
  |-
  | Data
+
  | Pitch
  | Byte array
+
  | Float
  | See [[Chunk Format#Data structure|data structure]] in Chunk Format
+
  | Float between 0.5 and 2.0 by Notchian clients
|-
 
| Number of block entities
 
| VarInt
 
| Number of elements in the following array
 
|-
 
| Block entities
 
| Array of [[NBT|NBT Tag]]
 
| All block entities in the chunk. Use the x, y, and z tags in the NBT to determine their positions.
 
 
  |}
 
  |}
  
Note that the Notchian client requires an [[#Update View Position|Update View Position]] packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.
+
==== Disconnect (play) ====
  
==== Effect ====
+
Sent by the server before it disconnects a client. The client assumes that the server has already closed the connection by the time the packet arrives.
 
 
Sent when a client is to play a sound or particle effect.
 
 
 
By default, the Minecraft client adjusts the volume of sound effects based on distance. The final boolean field is used to disable this, and instead the effect is played from 2 blocks away in the correct direction. Currently this is only used for effect 1023 (wither spawn) and effect 1028 (enderdragon death); it is ignored on other effects.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,236: Line 2,184:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x22
+
  | 0x19
  |rowspan="4"| Play
+
  | Play
  |rowspan="4"| Client
+
  | Client
  | Effect ID
+
| Reason
  | Int
+
  | [[Chat]]
  | The ID of the effect, see below
+
  | Displayed to the client when the connection terminates.
 +
  |}
 +
 
 +
==== Entity Status ====
 +
 
 +
Entity statuses generally trigger an animation for an entity.  The available statuses vary by the entity's type (and are available to subclasses of that type as well).
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | Location
+
  |rowspan="2"| 0x1A
  | Position
+
  |rowspan="2"| Play
  | The location of the effect
+
  |rowspan="2"| Client
|-
+
  | Entity ID
  | Data
 
 
  | Int
 
  | Int
  | Extra data for certain effects, see below
+
  |  
 
  |-
 
  |-
  | Disable Relative Volume
+
  | Entity Status
  | Boolean
+
  | Byte Enum
  | See above
+
  | See below
 
  |}
 
  |}
  
Effect IDs:
+
See [[Entity statuses]] for a list of which statuses are valid for each type of entity.
 +
 
 +
==== Explosion ====
 +
 
 +
Sent when an explosion occurs (creepers, TNT, and ghast fireballs).
 +
 
 +
Each block in Records is set to air. Coordinates for each axis in record is int(X) + record.x
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! ID
+
  ! Packet ID
  ! Name
+
  ! State
  ! Data
+
! Bound To
 +
! Field Name
 +
  ! Field Type
 +
! Notes
 
  |-
 
  |-
  !colspan="3"| Sound
+
  |rowspan="9"| 0x1B
  |-
+
|rowspan="9"| Play
  | 1000
+
  |rowspan="9"| Client
  | Dispenser dispenses
+
  | X
 +
  | Float
 
  |  
 
  |  
 
  |-
 
  |-
  | 1001
+
  | Y
  | Dispenser fails to dispense
+
  | Float
 
  |  
 
  |  
 
  |-
 
  |-
  | 1002
+
  | Z
  | Dispenser shoots
+
  | Float
 
  |  
 
  |  
 
  |-
 
  |-
  | 1003
+
  | Strength
  | Ender eye launched
+
  | Float
  |  
+
  | A strength greater than or equal to 2.0 spawns a <code>minecraft:explosion_emitter</code> particle, while a lesser strength spawns a <code>minecraft:explosion</code> particle.
 
  |-
 
  |-
  | 1004
+
  | Record Count
  | Firework shot
+
  | Int
  |  
+
  | Number of elements in the following array
 
  |-
 
  |-
  | 1005
+
  | Records
  | Iron door opened
+
  | Array of (Byte, Byte, Byte)
  |  
+
  | Each record is 3 signed bytes long; the 3 bytes are the XYZ (respectively) signed offsets of affected blocks.
 
  |-
 
  |-
  | 1006
+
  | Player Motion X
  | Wooden door opened
+
  | Float
  |  
+
  | X velocity of the player being pushed by the explosion
 
  |-
 
  |-
  | 1007
+
  | Player Motion Y
  | Wooden trapdoor opened
+
  | Float
  |  
+
  | Y velocity of the player being pushed by the explosion
 
  |-
 
  |-
  | 1008
+
  | Player Motion Z
  | Fence gate opened
+
  | Float
  |  
+
  | Z velocity of the player being pushed by the explosion
  |-
+
  |}
| 1009
+
 
  | Fire extinguished
+
==== Unload Chunk ====
  |
+
 
  |-
+
Tells the client to unload a chunk column.
  | 1010
+
 
  | Play record
+
{| class="wikitable"
  | Special case, see below for more info
+
  ! Packet ID
 +
  ! State
 +
  ! Bound To
 +
  ! Field Name
 +
  ! Field Type
 +
  ! Notes
 
  |-
 
  |-
  | 1011
+
  |rowspan="2"| 0x1C
  | Iron door closed
+
|rowspan="2"| Play
  |  
+
|rowspan="2"| Client
 +
| Chunk X
 +
  | Int
 +
  | Block coordinate divided by 16, rounded down
 
  |-
 
  |-
  | 1012
+
  | Chunk Z
  | Wooden door closed
+
  | Int
  |  
+
  | Block coordinate divided by 16, rounded down
 +
|}
 +
 
 +
It is legal to send this packet even if the given chunk is not currently loaded.
 +
 
 +
==== Change Game State ====
 +
 
 +
Used for a wide variety of game state things, from whether to bed use to gamemode to demo messages.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 1013
+
  |rowspan="2"| 0x1D
  | Wooden trapdoor closed
+
|rowspan="2"| Play
  |  
+
|rowspan="2"| Client
 +
| Reason
 +
  | Unsigned Byte
 +
  | See below
 
  |-
 
  |-
  | 1014
+
  | Value
  | Fence gate closed
+
  | Float
  |  
+
  | Depends on Reason
 +
|}
 +
 
 +
''Reason codes'':
 +
 
 +
{| class="wikitable"
 +
! Reason
 +
! Effect
 +
! Value
 +
|-
 +
| 0
 +
| No respawn block available
 +
| Note: Sends message 'block.minecraft.spawn.not_valid'(You have no home bed or charged respawn anchor, or it was obstructed) to the client.
 
  |-
 
  |-
  | 1015
+
  | 1
  | Ghast warns
+
  | End raining
 
  |  
 
  |  
 
  |-
 
  |-
  | 1016
+
  | 2
  | Ghast shoots
+
  | Begin raining
 
  |  
 
  |  
 
  |-
 
  |-
  | 1017
+
  | 3
  | Enderdragon shoots
+
  | Change gamemode
  |  
+
  | 0: Survival, 1: Creative, 2: Adventure, 3: Spectator
 
  |-
 
  |-
  | 1018
+
  | 4
  | Blaze shoots
+
  | Win game
  |  
+
  | 0: Just respawn player. <br>1: Roll the credits and respawn player. <br> Note that 1 is only sent by notchian server when player has not yet achieved advancement "The end?", else 0 is sent.
 
  |-
 
  |-
  | 1019
+
  | 5
  | Zombie attacks wood door
+
  | Demo event
  |  
+
  | 0: Show welcome to demo screen<br> 101: Tell movement controls<br> 102: Tell jump control<br> 103: Tell inventory control<br> 104: Tell that the demo is over and print a message about how to take a screenshot
 +
|-
 +
| 6
 +
| Arrow hit player
 +
| Note: Sent when any player is struck by an arrow.
 
  |-
 
  |-
  | 1020
+
  | 7
  | Zombie attacks iron door
+
  | Rain level change
  |  
+
  | Note: Seems to change both skycolor and lightning. <strong>[https://imgur.com/a/K6wSrkW You can see some level images here]</strong><br>This can cause [https://imgur.com/gallery/ZQX0Wd5 <strong>HUD color change in client</strong>], when level is higher than 20. It goes away only when game is restarted or client receives same packet (from any server) but with value of 0. Is this a bug?<br><br>Rain level starting from 0.
 
  |-
 
  |-
  | 1021
+
  | 8
  | Zombie breaks wood door
+
  | Thunder level change
  |
+
  | Note: Seems to change both skycolor and lightning (same as Rain level change, but doesn't start rain). It also requires rain to render by notchian client. ()<br>This can cause [https://imgur.com/gallery/ZQX0Wd5 <strong>HUD color change in client</strong>], when level is higher than 20. It goes away only when game is restarted or client receives same packet (from any server) but with value of 0. Is this a bug?<br><br>Thunder level starting from 0.
 
  |-
 
  |-
  | 1022
+
  | 9
| Wither breaks block
+
  | Play pufferfish sting sound
  |
 
 
  |-
 
  |-
  | 1023
+
  | 10
  | Wither spawned
+
  | Play elder guardian mob appearance (effect and sound)
 
  |  
 
  |  
 
  |-
 
  |-
  | 1024
+
  | 11
  | Wither shoots
+
  | Enable respawn screen
  |
+
  | 0: Enable respawn screen, 1: Immediately respawn (sent when the doImmediateRespawn gamerule changes)
 +
|}
 +
 
 +
==== Open Horse Window ====
 +
 
 +
This packet is used exclusively for opening the horse GUI.  [[#Open Window|Open Window]] is used for all other GUIs.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 1025
+
  |rowspan="3"| 0x1E
  | Bat takes off
+
|rowspan="3"| Play
 +
|rowspan="3"| Client
 +
| Window ID?
 +
  | Byte
 
  |
 
  |
 
  |-
 
  |-
  | 1026
+
  | Number of slots?
  | Zombie infects
+
  | VarInt
 
  |
 
  |
 
  |-
 
  |-
  | 1027
+
  | Entity ID?
  | Zombie villager converted
+
  | Integer
 
  |
 
  |
 +
|}
 +
 +
==== Keep Alive (clientbound) ====
 +
 +
The server will frequently send out a keep-alive, each containing a random ID. The client must respond with the same packet. If the client does not respond to them for over 30 seconds, the server kicks the client. Vice versa, if the server does not send any keep-alives for 20 seconds, the client will disconnect and yields a "Timed out" exception.
 +
 +
The Notchian server uses a system-dependent time in milliseconds to generate the keep alive ID value.
 +
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 1028
+
  | 0x1F
  | Ender dragon death
+
  | Play
  |
+
  | Client
  |-
+
  | Keep Alive ID
  | 1029
+
  | Long
| Anvil destroyed
 
 
  |  
 
  |  
 +
|}
 +
 +
==== Chunk Data ====
 +
{{Main|Chunk Format}}
 +
{{See also|#Unload Chunk}}
 +
 +
{{Need Info|How do biomes work now?  The biome change happened at the same time as the seed change, but it's not clear how/if biomes could be computed given that it's not the actual seed...  ([https://www.reddit.com/r/Mojira/comments/e5at6i/a_discussion_for_the_changes_to_how_biomes_are/ /r/mojira discussion] which notes that it seems to be some kind of interpolation, and 3D biomes are only used in the nether)}}
 +
 +
The server only sends skylight information for chunk pillars in the {{Minecraft Wiki|Overworld}}, it's up to the client to know in which dimenison the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent.  This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with [[#Update Block Entity|Update Block Entity]] later).
 +
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 1030
+
  |rowspan="11"| 0x20
  | Anvil used
+
|rowspan="11"| Play
  |  
+
|rowspan="11"| Client
 +
| Chunk X
 +
  | Int
 +
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  | 1031
+
  | Chunk Z
  | Anvil landed
+
  | Int
  |
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  | 1032
+
  | Full chunk
  | Portal travel
+
  | Boolean
  |  
+
  | See [[Chunk Format#Full chunk|Chunk Format]]
 
  |-
 
  |-
  | 1033
+
  | Primary Bit Mask
  | Chorus flower grown
+
  | VarInt
  |
+
  | Bitmask with bits set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15).
 
  |-
 
  |-
  | 1034
+
  | Heightmaps
  | Chorus flower died
+
  | [[NBT]]
  |  
+
  | Compound containing one long array named <code>MOTION_BLOCKING</code>, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a <code>WORLD_SURFACE</code> long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
 +
|-
 +
| Biomes length
 +
| Optional VarInt
 +
| Size of the following array.  Not present if full chunk is false.
 
  |-
 
  |-
  | 1035
+
  | Biomes
  | Brewing stand brewed
+
  | Optional array of VarInt
  |
+
  | <s>1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks.</s>Possibly something else.  Not present if full chunk is false.
 +
|-
 +
| Size
 +
| VarInt
 +
| Size of Data in bytes
 
  |-
 
  |-
  | 1036
+
  | Data
  | Iron trapdoor opened
+
  | Byte array
  |  
+
  | See [[Chunk Format#Data structure|data structure]] in Chunk Format
 
  |-
 
  |-
  | 1037
+
  | Number of block entities
  | Iron trapdoor closed
+
  | VarInt
  |
+
  | Number of elements in the following array
 
  |-
 
  |-
  !colspan="3"| Particle
+
  | Block entities
 +
| Array of [[NBT|NBT Tag]]
 +
| All block entities in the chunk.  Use the x, y, and z tags in the NBT to determine their positions.
 +
|}
 +
 
 +
Note that the Notchian client requires an [[#Update View Position|Update View Position]] packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.
 +
 
 +
The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.
 +
 
 +
New format, 5 bits per block, containing the following references to blocks in a palette (not shown): <span style="border: solid 2px hsl(0, 90%, 60%)">1</span><span style="border: solid 2px hsl(30, 90%, 60%)">2</span><span style="border: solid 2px hsl(60, 90%, 60%)">2</span><span style="border: solid 2px hsl(90, 90%, 60%)">3</span><span style="border: solid 2px hsl(120, 90%, 60%)">4</span><span style="border: solid 2px hsl(150, 90%, 60%)">4</span><span style="border: solid 2px hsl(180, 90%, 60%)">5</span><span style="border: solid 2px hsl(210, 90%, 60%)">6</span><span style="border: solid 2px hsl(240, 90%, 60%)">6</span><span style="border: solid 2px hsl(270, 90%, 60%)">4</span><span style="border: solid 2px hsl(300, 90%, 60%)">8</span><span style="border: solid 2px hsl(330, 90%, 60%)">0</span><span style="border: solid 2px hsl(0, 90%, 30%)">7</span><span style="border: solid 2px hsl(30, 90%, 30%)">4</span><span style="border: solid 2px hsl(60, 90%, 30%)">3</span><span style="border: solid 2px hsl(90, 90%, 30%)">13</span><span style="border: solid 2px hsl(120, 90%, 30%)">15</span><span style="border: solid 2px hsl(150, 90%, 30%)">16</span><span style="border: solid 2px hsl(180, 90%, 30%)">9</span><span style="border: solid 2px hsl(210, 90%, 30%)">14</span><span style="border: solid 2px hsl(240, 90%, 30%)">10</span><span style="border: solid 2px hsl(270, 90%, 30%)">12</span><span style="border: solid 2px hsl(300, 90%, 30%)">0</span><span style="border: solid 2px hsl(330, 90%, 30%)">2</span>
 +
 
 +
<code>0020863148418841</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 60%)">00000</span><span style="outline: solid 2px hsl(300, 90%, 60%)">01000</span><span style="outline: solid 2px hsl(270, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(240, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(210, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(180, 90%, 60%)">00101</span><span style="outline: solid 2px hsl(150, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(120, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(90, 90%, 60%)">00011</span><span style="outline: solid 2px hsl(60, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(30, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(0, 90%, 60%)">00001</span></code><br>
 +
<code>01018A7260F68C87</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 30%)">00010</span><span style="outline: solid 2px hsl(300, 90%, 30%)">00000</span><span style="outline: solid 2px hsl(270, 90%, 30%)">01100</span><span style="outline: solid 2px hsl(240, 90%, 30%)">01010</span><span style="outline: solid 2px hsl(210, 90%, 30%)">01110</span><span style="outline: solid 2px hsl(180, 90%, 30%)">01001</span><span style="outline: solid 2px hsl(150, 90%, 30%)">10000</span><span style="outline: solid 2px hsl(120, 90%, 30%)">01111</span><span style="outline: solid 2px hsl(90, 90%, 30%)">01101</span><span style="outline: solid 2px hsl(60, 90%, 30%)">00011</span><span style="outline: solid 2px hsl(30, 90%, 30%)">00100</span><span style="outline: solid 2px hsl(0, 90%, 30%)">00111</span></code>
 +
==== Effect ====
 +
Sent when a client is to play a sound or particle effect.
 +
 
 +
By default, the Minecraft client adjusts the volume of sound effects based on distance. The final boolean field is used to disable this, and instead the effect is played from 2 blocks away in the correct direction. Currently this is only used for effect 1023 (wither spawn), effect 1028 (enderdragon death), and effect 1038 (end portal opening); it is ignored on other effects.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 2000
+
  |rowspan="4"| 0x21
  | Spawns 10 smoke particles, e.g. from a fire
+
|rowspan="4"| Play
  | Direction, see below
+
|rowspan="4"| Client
 +
| Effect ID
 +
  | Int
 +
  | The ID of the effect, see below
 
  |-
 
  |-
  | 2001
+
  | Location
  | Block break + block break sound
+
  | Position
  | Block state, as an index into the global palette
+
  | The location of the effect
 
  |-
 
  |-
  | 2002
+
  | Data
  | Splash potion. Particle effect + glass break sound.
+
  | Int
  | [http://minecraft.gamepedia.com/Data_values#Potions Potion ID]
+
  | Extra data for certain effects, see below
 +
|-
 +
| Disable Relative Volume
 +
| Boolean
 +
| See above
 +
|}
 +
 
 +
Effect IDs:
 +
 
 +
{| class="wikitable"
 +
! ID
 +
! Name
 +
! Data
 +
|-
 +
!colspan="3"| Sound
 
  |-
 
  |-
  | 2003
+
  | 1000
  | Eye of Ender entity break animation — particles and sound
+
  | Dispenser dispenses
 
  |  
 
  |  
 
  |-
 
  |-
  | 2004
+
  | 1001
  | Mob spawn particle effect: smoke + flames
+
  | Dispenser fails to dispense
 
  |  
 
  |  
 
  |-
 
  |-
  | 2005
+
  | 1002
  | Bonemeal particles
+
  | Dispenser shoots
  | How many particles to spawn (if set to 0, 15 are spawned)
+
  |  
 
  |-
 
  |-
  | 2006
+
  | 1003
  | Dragon breath
+
  | Ender eye launched
  |
+
  |  
 
  |-
 
  |-
  | 2007
+
  | 1004
  | Instant splash potion
+
  | Firework shot
  | [http://minecraft.gamepedia.com/Data_values#Potions Potion ID]
+
  |  
 
  |-
 
  |-
  | 3000
+
  | 1005
  | End gateway spawn
+
  | Iron door opened
 
  |  
 
  |  
 
  |-
 
  |-
  | 3001
+
  | 1006
  | Enderdragon growl
+
  | Wooden door opened
  |
+
  |  
  |}
+
  |-
 
+
| 1007
Smoke directions:
+
  | Wooden trapdoor opened
 
+
  |
{| class="wikitable"
 
  ! ID
 
  ! Direction
 
 
  |-
 
  |-
  | 0
+
  | 1008
  | South-East
+
| Fence gate opened
 +
  |  
 
  |-
 
  |-
  | 1
+
  | 1009
  | South
+
| Fire extinguished
 +
  |  
 
  |-
 
  |-
  | 2
+
  | 1010
  | South-West
+
  | Play record
 +
| Special case, see below for more info
 
  |-
 
  |-
  | 3
+
  | 1011
  | East
+
| Iron door closed
 +
  |  
 
  |-
 
  |-
  | 4
+
  | 1012
  | (Up or middle ?)
+
| Wooden door closed
 +
  |  
 
  |-
 
  |-
  | 5
+
  | 1013
  | West
+
| Wooden trapdoor closed
 +
  |  
 
  |-
 
  |-
  | 6
+
  | 1014
  | North-East
+
| Fence gate closed
 +
  |  
 
  |-
 
  |-
  | 7
+
  | 1015
  | North
+
| Ghast warns
 +
  |  
 
  |-
 
  |-
  | 8
+
  | 1016
  | North-West
+
  | Ghast shoots
  |}
+
  |  
 
 
Play record: This is actually a special case within this packet. You can start/stop a record at a specific location. Use a valid {{Minecraft Wiki|Music Discs|Record ID}} to start a record (or overwrite a currently playing one), any other value will stop the record.  See [[Data Generators]] for information on item IDs.
 
 
 
==== Particle ====
 
 
 
Displays the named particle
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="11"| 0x23
+
  | 1017
  |rowspan="11"| Play
+
  | Enderdragon shoots
  |rowspan="11"| Client
+
  |  
| Particle ID
 
| Int
 
| The particle ID listed in [[#Particle|the particle data type]].
 
 
  |-
 
  |-
  | Long Distance
+
  | 1018
  | Boolean
+
  | Blaze shoots
  | If true, particle distance increases from 256 to 65536
+
  |  
 
  |-
 
  |-
  | X
+
  | 1019
  | Float
+
  | Zombie attacks wood door
  | X position of the particle
+
  |  
 
  |-
 
  |-
  | Y
+
  | 1020
  | Float
+
  | Zombie attacks iron door
  | Y position of the particle
+
  |  
 
  |-
 
  |-
  | Z
+
  | 1021
  | Float
+
  | Zombie breaks wood door
  | Z position of the particle
+
  |
 
  |-
 
  |-
  | Offset X
+
  | 1022
  | Float
+
  | Wither breaks block
  | This is added to the X position after being multiplied by random.nextGaussian()
+
  |
 
  |-
 
  |-
  | Offset Y
+
  | 1023
  | Float
+
  | Wither spawned
  | This is added to the Y position after being multiplied by random.nextGaussian()
+
  |  
 
  |-
 
  |-
  | Offset Z
+
  | 1024
  | Float
+
  | Wither shoots
  | This is added to the Z position after being multiplied by random.nextGaussian()
+
  |
 
  |-
 
  |-
  | Particle Data
+
  | 1025
  | Float
+
  | Bat takes off
  | The data of each particle
+
  |
 
  |-
 
  |-
  | Particle Count
+
  | 1026
  | Int
+
  | Zombie infects
  | The number of particles to create
+
  |
 
  |-
 
  |-
  | Data
+
  | 1027
  | Varies
+
  | Zombie villager converted
  | The variable data listed in [[#Particle|the particle data type]].
+
  |
|}
 
 
 
==== Update Light ====
 
 
 
Updates light levels for a chunk.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="10"| 0x24
+
  | 1028
|rowspan="10"| Play
+
  | Ender dragon death
|rowspan="10"| Client
+
  |
  |colspan="2"| Chunk X
 
|colspan="2"| VarInt
 
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
 
  |-
 
  |-
  |colspan="2"| Chunk Z
+
  | 1029
  |colspan="2"| VarInt
+
  | Anvil destroyed
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  |  
 
  |-
 
  |-
  |colspan="2"| Sky Light Mask
+
  | 1030
  |colspan="2"| VarInt
+
  | Anvil used
  | Mask containing 18 bits, with the lowest bit corresponding to chunk section -1 (in the void, y=-16 to y=-1) and the highest bit for chunk section 16 (above the world, y=256 to y=271)
+
  |  
 
  |-
 
  |-
  |colspan="2"| Block Light Mask
+
  | 1031
  |colspan="2"| VarInt
+
  | Anvil landed
  | Mask containing 18 bits, with the same order as sky light
+
  |
 
  |-
 
  |-
  |colspan="2"| Empty Sky Light Mask
+
  | 1032
  |colspan="2"| VarInt
+
  | Portal travel
  | Mask containing 18 bits, which indicates sections that have 0 for all their sky light values.  If a section is set in both this mask and the main sky light mask, it is ignored for this mask and it is included in the sky light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the sky light arrays.
+
  |  
 
  |-
 
  |-
  |colspan="2"| Empty Block Light Mask
+
  | 1033
  |colspan="2"| VarInt
+
  | Chorus flower grown
  | Mask containing 18 bits, which indicates sections that have 0 for all their block light values.  If a section is set in both this mask and the main block light mask, it is ignored for this mask and it is included in the block light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the block light arrays.
+
  |
 
  |-
 
  |-
  |rowspan="2"| Sky Light arrays
+
  | 1034
| Length
+
  | Chorus flower died
|rowspan="2"| Array
+
  |  
  | VarInt
 
  | Length of the following array in bytes (always 2048)
 
 
  |-
 
  |-
  | Sky Light array
+
  | 1035
  | Array of 2048 bytes
+
  | Brewing stand brewed
  | There is 1 array for each bit set to true in the sky light mask, starting with the lowest value.  Half a byte per light value.
+
  |
 
  |-
 
  |-
  |rowspan="2"| Block Light arrays
+
  | 1036
| Length
+
  | Iron trapdoor opened
|rowspan="2"| Array
+
  |  
  | VarInt
 
  | Length of the following array in bytes (always 2048)
 
 
  |-
 
  |-
  | Block Light array
+
  | 1037
  | Array of 2048 bytes
+
  | Iron trapdoor closed
  | There is 1 array for each bit set to true in the block light mask, starting with the lowest value.  Half a byte per light value.
+
  |
|}
 
 
 
Individual block or sky light arrays are is given for each block with increasing x coordinates, within rows of increasing z coordinates, within layers of increasing y coordinates. Even-indexed items (those with an even x coordinate, starting at 0) are packed into the low bits, odd-indexed into the high bits.
 
 
 
==== Join Game ====
 
 
 
See [[Protocol Encryption]] for information on logging in.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="7"| 0x25
+
  | 1038
|rowspan="7"| Play
+
  | End portal created in overworld
|rowspan="7"| Client
+
  |
| Entity ID
 
  | Int
 
  | The player's Entity ID (EID)
 
 
  |-
 
  |-
  | Gamemode
+
  | 1039
  | Unsigned Byte
+
  | Phantom bites
  | 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. Bit 3 (0x8) is the hardcore flag.
+
  |
 
  |-
 
  |-
  | Dimension
+
  | 1040
  | Int Enum
+
  | Zombie converts to drowned
  | -1: Nether, 0: Overworld, 1: End; also, note that this is not a VarInt but instead a regular int.
+
  |
 
  |-
 
  |-
  | Max Players
+
  | 1041
  | Unsigned Byte
+
  | Husk converts to zombie by drowning
  | Was once used by the client to draw the player list, but now is ignored
+
  |
 
  |-
 
  |-
  | Level Type
+
  | 1042
  | String Enum (16)
+
  | Grindstone used
  | default, flat, largeBiomes, amplified, customized, buffet, default_1_1
+
  |
 
  |-
 
  |-
  | View Distance
+
  | 1043
  | VarInt
+
  | Book page turned
  | Render distance (2-32)
+
  |
 
  |-
 
  |-
| Reduced Debug Info
 
| Boolean
 
| If true, a Notchian client shows reduced information on the {{Minecraft Wiki|debug screen}}.  For servers in development, this should almost always be false.
 
|}
 
 
==== Map Data ====
 
 
Updates a rectangular area on a {{Minecraft Wiki|map}} item.
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="17"| 0x26
+
  !colspan="3"| Particle
  |rowspan="17"| Play
+
  |-
  |rowspan="17"| Client
+
  | 1500
  |colspan="2"| Map ID
+
  | Composter composts
|colspan="2"| VarInt
+
  |
  | Map ID of the map being modified
 
 
  |-
 
  |-
  |colspan="2"| Scale
+
  | 1501
  |colspan="2"| Byte
+
  | Lava converts block (either water to stone, or removes existing blocks such as torches)
| From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
+
  |
  |-
 
|colspan="2"| Tracking Position
 
|colspan="2"| Boolean
 
| Specifies whether player and item frame icons are shown
 
 
  |-
 
  |-
  |colspan="2"| Locked
+
  | 1502
  |colspan="2"| Boolean
+
  | Redstone torch burns out
  | True if the map has been locked in a cartography table
+
  |
 
  |-  
 
  |-  
  |colspan="2"| Icon Count
+
  | 1503
  |colspan="2"| VarInt
+
  | Ender eye placed
  | Number of elements in the following array
+
  |
 
  |-
 
  |-
  |rowspan="6"| Icon
+
  | 2000
| Type
+
  | Spawns 10 smoke particles, e.g. from a fire
|rowspan="6"| Array
+
  | Direction, see below
  | VarInt enum
 
  | See below
 
 
  |-
 
  |-
  | X
+
  | 2001
  | Byte
+
  | Block break + block break sound
  | Map coordinates: -128 for furthest left, +127 for furthest right
+
  | Block state, as an index into the global palette
 
  |-
 
  |-
  | Z
+
  | 2002
  | Byte
+
  | Splash potion. Particle effect + glass break sound.
  | Map coordinates: -128 for highest, +127 for lowest
+
  | [http://minecraft.gamepedia.com/Data_values#Potions Potion ID]
 
  |-
 
  |-
  | Direction
+
  | 2003
  | Byte
+
  | Eye of Ender entity break animation — particles and sound
  | 0-15
+
  |  
 
  |-
 
  |-
  | Has Display Name
+
  | 2004
  | Boolean
+
  | Mob spawn particle effect: smoke + flames
  |
+
  |  
 
  |-
 
  |-
  | Display Name
+
  | 2005
  | Optional [[Chat]]
+
  | Bonemeal particles
  | Only present if previous Boolean is true
+
  | How many particles to spawn (if set to 0, 15 are spawned)
  |-  
+
  |-
  |colspan="2"| Columns
+
  | 2006
  |colspan="2"| Unsigned Byte
+
  | Dragon breath
  | Number of columns updated
+
  |
 
  |-
 
  |-
  |colspan="2"| Rows
+
  | 2007
  |colspan="2"| Optional Byte
+
  | Instant splash potion
  | Only if Columns is more than 0; number of rows updated
+
  | [http://minecraft.gamepedia.com/Data_values#Potions Potion ID]
 
  |-
 
  |-
  |colspan="2"| X
+
  | 2008
  |colspan="2"| Optional Byte
+
  | Ender dragon destroys block
  | Only if Columns is more than 0; x offset of the westernmost column
+
  |
 
  |-
 
  |-
  |colspan="2"| Z
+
  | 2009
  |colspan="2"| Optional Byte
+
  | Wet sponge vaporizes in nether
  | Only if Columns is more than 0; z offset of the northernmost row
+
  |
 
  |-
 
  |-
  |colspan="2"| Length
+
  | 3000
  |colspan="2"| Optional VarInt
+
  | End gateway spawn
  | Only if Columns is more than 0; length of the following array
+
  |  
 
  |-
 
  |-
  |colspan="2"| Data
+
  | 3001
  |colspan="2"| Optional Array of Unsigned Byte
+
  | Enderdragon growl
  | Only if Columns is more than 0; see {{Minecraft Wiki|Map item format}}
+
  |
 
  |}
 
  |}
  
For icons, a direction of 0 is a vertical icon and increments by 22.5&deg; (360/16).
+
Smoke directions:
 
 
Types are based off of rows and columns in <code>map_icons.png</code>:
 
  
 
{| class="wikitable"
 
{| class="wikitable"
|-
+
  ! ID
  ! Icon type
+
  ! Direction
  ! Result
 
 
  |-
 
  |-
 
  | 0
 
  | 0
  | White arrow (players)
+
  | South-East
 
  |-
 
  |-
 
  | 1
 
  | 1
  | Green arrow (item frames)
+
  | South
 
  |-
 
  |-
 
  | 2
 
  | 2
  | Red arrow
+
  | South-West
 
  |-
 
  |-
 
  | 3
 
  | 3
  | Blue arrow
+
  | East
 
  |-
 
  |-
 
  | 4
 
  | 4
  | White cross
+
  | (Up or middle ?)
 
  |-
 
  |-
 
  | 5
 
  | 5
  | Red pointer
+
  | West
 
  |-
 
  |-
 
  | 6
 
  | 6
  | White circle (off-map players)
+
  | North-East
 
  |-
 
  |-
 
  | 7
 
  | 7
  | Small white circle (far-off-map players)
+
  | North
 
  |-
 
  |-
 
  | 8
 
  | 8
  | Mansion
+
  | North-West
 +
|}
 +
 
 +
Play record: This is actually a special case within this packet. You can start/stop a record at a specific location. Use a valid {{Minecraft Wiki|Music Discs|Record ID}} to start a record (or overwrite a currently playing one), any other value will stop the record.  See [[Data Generators]] for information on item IDs.
 +
 
 +
==== Particle ====
 +
 
 +
Displays the named particle
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 9
+
  |rowspan="11"| 0x22
  | Temple
+
|rowspan="11"| Play
 +
|rowspan="11"| Client
 +
| Particle ID
 +
| Int
 +
  | The particle ID listed in [[#Particle|the particle data type]].
 
  |-
 
  |-
  | 10
+
  | Long Distance
  | White Banner
+
  | Boolean
 +
| If true, particle distance increases from 256 to 65536
 
  |-
 
  |-
  | 11
+
  | X
  | Orange Banner
+
  | Double
 +
| X position of the particle
 
  |-
 
  |-
  | 12
+
  | Y
  | Magenta Banner
+
  | Double
 +
| Y position of the particle
 
  |-
 
  |-
  | 13
+
  | Z
  | Light Blue Banner
+
  | Double
 +
| Z position of the particle
 
  |-
 
  |-
  | 14
+
  | Offset X
  | Yellow Banner
+
  | Float
 +
| This is added to the X position after being multiplied by random.nextGaussian()
 
  |-
 
  |-
  | 15
+
  | Offset Y
  | Lime Banner
+
  | Float
 +
| This is added to the Y position after being multiplied by random.nextGaussian()
 
  |-
 
  |-
  | 16
+
  | Offset Z
  | Pink Banner
+
  | Float
 +
| This is added to the Z position after being multiplied by random.nextGaussian()
 
  |-
 
  |-
  | 17
+
  | Particle Data
  | Gray Banner
+
  | Float
 +
| The data of each particle
 
  |-
 
  |-
  | 18
+
  | Particle Count
  | Light Gray Banner
+
  | Int
 +
| The number of particles to create
 
  |-
 
  |-
  | 19
+
  | Data
  | Cyan Banner
+
  | Varies
  |-
+
  | The variable data listed in [[#Particle|the particle data type]].
| 20
 
| Purple Banner
 
|-
 
| 21
 
| Blue Banner
 
|-
 
| 22
 
| Brown Banner
 
|-
 
| 23
 
| Green Banner
 
|-
 
| 24
 
| Red Banner
 
|-
 
| 25
 
| Black Banner
 
|-
 
| 26
 
| Treasure marker
 
 
  |}
 
  |}
  
==== Trade List ====
+
==== Update Light ====
  
The list of trades a villager NPC is offering.
+
Updates light levels for a chunk.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,851: Line 2,893:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="18"| 0x27
+
  |rowspan="11"| 0x23
  |rowspan="18"| Play
+
  |rowspan="11"| Play
  |rowspan="18"| Client
+
  |rowspan="11"| Client
 +
|colspan="2"| Chunk X
 +
|colspan="2"| VarInt
 +
| Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  | colspan="2" | Window ID
+
  |colspan="2"| Chunk Z
  | colspan="2" | VarInt
+
  |colspan="2"| VarInt
  | The ID of the window that is open; this is an int rather than a byte.
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  | colspan="2" | Size
+
  |colspan="2"| Trust Edges
  | colspan="2" | Byte
+
  |colspan="2"| Boolean
  | The number of trades in the following array
+
  | If edges should be trusted for light updates.
 
  |-
 
  |-
  | rowspan="11" | Trades
+
  |colspan="2"| Sky Light Mask
  | Input item 1
+
  |colspan="2"| VarInt
| rowspan="11" | Array
+
  | Mask containing 18 bits, with the lowest bit corresponding to chunk section -1 (in the void, y=-16 to y=-1) and the highest bit for chunk section 16 (above the world, y=256 to y=271)
  | [[Slot]]
 
| The first item the villager is buying
 
 
  |-
 
  |-
  | Output item
+
  |colspan="2"| Block Light Mask
  | [[Slot]]
+
  |colspan="2"| VarInt
  | The item the villager is selling
+
  | Mask containing 18 bits, with the same order as sky light
 
  |-
 
  |-
  | Has second item
+
  |colspan="2"| Empty Sky Light Mask
  | Boolean
+
  |colspan="2"| VarInt
  | Whether there is a second item
+
  | Mask containing 18 bits, which indicates sections that have 0 for all their sky light values.  If a section is set in both this mask and the main sky light mask, it is ignored for this mask and it is included in the sky light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the sky light arrays.
 
  |-
 
  |-
  | Input item 2
+
  |colspan="2"| Empty Block Light Mask
  | Optional [[Slot]]
+
  |colspan="2"| VarInt
  | The second item the villager is buying; only present if they have a second item.
+
  | Mask containing 18 bits, which indicates sections that have 0 for all their block light values.  If a section is set in both this mask and the main block light mask, it is ignored for this mask and it is included in the block light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the block light arrays.
 
  |-
 
  |-
  | Trade disabled
+
  |rowspan="2"| Sky Light arrays
  | Boolean
+
  | Length
  | True if the trade is disabled; false if the trade is enabled.
+
  |rowspan="2"| Array
 +
| VarInt
 +
| Length of the following array in bytes (always 2048)
 
  |-
 
  |-
  | Number of trade uses
+
  | Sky Light array
  | Integer
+
| Array of 2048 bytes
  | Number of times the trade has been used so far
+
| There is 1 array for each bit set to true in the sky light mask, starting with the lowest value.  Half a byte per light value.
 +
|-
 +
|rowspan="2"| Block Light arrays
 +
| Length
 +
|rowspan="2"| Array
 +
  | VarInt
 +
  | Length of the following array in bytes (always 2048)
 
  |-
 
  |-
  | Maximum number of trade uses
+
  | Block Light array
  | Integer
+
| Array of 2048 bytes
  | Number of times this trade can be used
+
  | There is 1 array for each bit set to true in the block light mask, starting with the lowest value.  Half a byte per light value.
 +
  |}
 +
 
 +
Individual block or sky light arrays are is given for each block with increasing x coordinates, within rows of increasing z coordinates, within layers of increasing y coordinates. Even-indexed items (those with an even x coordinate, starting at 0) are packed into the low bits, odd-indexed into the high bits.
 +
 
 +
For the arrays: there are 18 of each, 18 block light arrays and 18 sky light arrays. Each array is in the format described, 2048 as a VarInt, followed by 2048 bytes which describe 4096 items. The update masks use their 18 least significant bits to indicate whether or not the packet will include an array at that index. For example: if all bits except for the least significant bit are set to 1, and the least significant bit is set to 0, then all arrays except for array #0 are included (for a total of 17 arrays or 17 * 2048 bytes).
 +
 
 +
==== Join Game ====
 +
 
 +
See [[Protocol Encryption]] for information on logging in.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | XP
+
  |rowspan="16"| 0x24
  | Integer
+
|rowspan="16"| Play
  |
+
|rowspan="16"| Client
 +
| Entity ID
 +
  | Int
 +
  | The player's Entity ID (EID)
 
  |-
 
  |-
  | Special Price
+
  | Is hardcore
  | Integer
+
  | Boolean
 
  |
 
  |
 
  |-
 
  |-
  | Price Multiplier
+
  | Gamemode
  | Float
+
  | Unsigned Byte
  |
+
  | 0: Survival, 1: Creative, 2: Adventure, 3: Spectator.
 
  |-
 
  |-
  | Demand
+
  | Previous Gamemode
  | Integer
+
  | Byte
  |
+
  | 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. Defaults to -1 if there is no previous gamemode. (More information needed)
 
  |-
 
  |-
  |colspan="2"| Villager level
+
  | World Count
  |colspan="2"| VarInt
+
| VarInt
  | Appears on the trade GUI; meaning comes from the translation key <code>merchant.level.</code> + level.
+
| Size of the following array
1: Novice, 2: Apprentice, 3: Journeyman, 4: Expert, 5: Master
+
|-
 +
  | World Names
 +
| Array of Identifier
 +
  | Identifiers for all worlds on the server
 +
|-
 +
| Dimension Codec
 +
| [[NBT|NBT Tag Compound]]
 +
| The full extent of these is still unknown, but the tag represents a dimension and biome registry. See below for the vanilla default.
 +
|-
 +
| Dimension
 +
| [[NBT|NBT Tag Compound]]
 +
| Valid dimensions are defined per dimension registry sent before this
 +
|-
 +
| World Name
 +
| Identifier
 +
| Name of the world being spawned into
 +
|-
 +
| Hashed seed
 +
| Long
 +
| First 8 bytes of the SHA-256 hash of the world's seed.
 +
|-
 +
| Max Players
 +
| VarInt
 +
| Was once used by the client to draw the player list, but now is ignored
 +
|-
 +
| View Distance
 +
| VarInt
 +
| Render distance (2-32)
 +
|-
 +
| Reduced Debug Info
 +
| Boolean
 +
| If true, a Notchian client shows reduced information on the {{Minecraft Wiki|debug screen}}.  For servers in development, this should almost always be false.
 
  |-
 
  |-
  |colspan="2"| Experience
+
  | Enable respawn screen
  |colspan="2"| VarInt
+
  | Boolean
  | Total experience for this villager (always 0 for the wandering trader)
+
  | Set to false when the doImmediateRespawn gamerule is true
 
  |-
 
  |-
  |colspan="2"| Is regular villager
+
  | Is Debug
  |colspan="2"| Boolean
+
  | Boolean
  | True if this is a regular villager; false for the wandering trader.  When false, hides the villager level and some other GUI elements.
+
  | True if the world is a {{Minecraft Wiki|debug mode}} world; debug mode worlds cannot be modified and have predefined blocks
 
  |-
 
  |-
  |colspan="2"| Can restock
+
  | Is Flat
  |colspan="2"| Boolean
+
  | Boolean
  | True for regular villagers and false for the wandering trader.  If true, the "Villagers restock up to two times per day." message is displayed when hovering over disabled trades.
+
  | True if the world is a {{Minecraft Wiki|superflat}} world; flat worlds have different void fog and a horizon at y=0 instead of y=63
 
  |}
 
  |}
  
[[File:1.14-merchant-slots.png|thumb|The merchant UI, for reference]]
+
{{Need Info|Lay out and explain the format}}
{{-}}
 
  
==== Entity Position ====
+
'''[https://paste.gg/p/KennyTV/ad46ef552c6443cc808385f060564550 Default Vanilla Dimension/Biome Codec]'''
  
This packet is sent by the server when an entity moves less then 8 blocks; if an entity moves more than 8 blocks [[#Entity Teleport|Entity Teleport]] should be sent instead.
+
Known dimension attributes:
 
 
This packet allows at most 8 blocks movement in any direction, because short range is from -32768 to 32767. And <code>32768 / (128 * 32)</code> = 8.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! Name
  ! State
+
  ! Type
  ! Bound To
+
  !style="width: 250px;" colspan="2"| Meaning
  ! Field Name
+
  ! Values
  ! Field Type
+
|-
  ! Notes
+
| name
 +
| String
 +
  |colspan="2"| Dimension's name
 +
  | "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
 
  |-
 
  |-
  |rowspan="5"| 0x28
+
  | piglin_safe
  |rowspan="5"| Play
+
| Byte
  |rowspan="5"| Client
+
|colspan="2"| Whether piglins shake and transform to zombified piglins.
  | Entity ID
+
| 1: true, 0: false
  | VarInt
+
|-
  |  
+
| natural
 +
| Byte
 +
|colspan="2"| When false, compasses spin randomly. When true, nether portals can spawn zombified piglins.
 +
| 1: true, 0: false
 +
|-
 +
| ambient_light
 +
| Float
 +
|colspan="2"| How much light the dimension has.
 +
| 0.0 to 1.0
 +
  |-
 +
| fixed_time
 +
| Long
 +
|colspan="2"| If this is set to a number, the time of the day is the specified value.
 +
| false, or 0 to 24000
 +
|-
 +
| infiniburn
 +
| String
 +
  |colspan="2"| A resource location defining what block tag to use for infiniburn.
 +
  | "" or minecraft resource "minecraft:..."
 +
  |-
 +
| respawn_anchor_works
 +
| Byte
 +
|colspan="2"| Whether players can charge and use respawn anchors.
 +
| 1: true, 0: false
 +
|-
 +
| has_skylight
 +
| Byte
 +
|colspan="2"| Whether the dimension has skylight access or not.
 +
| 1: true, 0: false
 +
|-
 +
| bed_works
 +
| Byte
 +
|colspan="2"| Whether players can use a bed to sleep.
 +
| 1: true, 0: false
 +
|-
 +
| effects
 +
| String
 +
|colspan="2"| ?
 +
| "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
 +
|-
 +
| has_raids
 +
| Byte
 +
|colspan="2"| Whether players with the Bad Omen effect can cause a raid.
 +
  | 1: true, 0: false
 
  |-
 
  |-
  | Delta X
+
  | logical_height
  | Short
+
  | Int
  | Change in X position as <code>(currentX * 32 - prevX * 32) * 128</code>
+
  |colspan="2"| The maximum height to which chorus fruits and nether portals can bring players within this dimension.
 +
| 0-256
 
  |-
 
  |-
  | Delta Y
+
  | coordinate_scale
  | Short
+
  | Float
  | Change in Y position as <code>(currentY * 32 - prevY * 32) * 128</code>
+
  |colspan="2"| The multiplier applied to coordinates when traveling to the dimension.
 +
| 1: true, 0: false
 
  |-
 
  |-
  | Delta Z
+
  | ultrawarm
  | Short
+
  | Byte
  | Change in Z position as <code>(currentZ * 32 - prevZ * 32) * 128</code>
+
  |colspan="2"| Whether the dimensions behaves like the nether (water evaporates and sponges dry) or not. Also causes lava to spread thinner.
 +
| 1: true, 0: false
 
  |-
 
  |-
  | On Ground
+
  | has_ceiling
  | Boolean
+
  | Byte
  |  
+
  |colspan="2"| Whether the dimension has a bedrock ceiling or not. When true, causes lava to spread faster.
 +
| 1: true, 0: false
 
  |}
 
  |}
  
==== Entity Position and Rotation ====
+
==== Map Data ====
  
This packet is sent by the server when an entity rotates and moves. Since a short range is limited from -32768 to 32767, and movement is offset of fixed-point numbers, this packet allows at most 8 blocks movement in any direction. (<code>-32768 / (32 * 128) == -8</code>)
+
Updates a rectangular area on a {{Minecraft Wiki|map}} item.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,976: Line 3,125:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="7"| 0x29
+
  |rowspan="17"| 0x25
  |rowspan="7"| Play
+
  |rowspan="17"| Play
  |rowspan="7"| Client
+
  |rowspan="17"| Client
  | Entity ID
+
  |colspan="2"| Map ID
  | VarInt
+
  |colspan="2"| VarInt
  |  
+
  | Map ID of the map being modified
 +
|-
 +
|colspan="2"| Scale
 +
|colspan="2"| Byte
 +
| From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
 +
|-
 +
|colspan="2"| Tracking Position
 +
|colspan="2"| Boolean
 +
| Specifies whether player and item frame icons are shown
 
  |-
 
  |-
  | Delta X
+
  |colspan="2"| Locked
  | Short
+
  |colspan="2"| Boolean
  | Change in X position as <code>(currentX * 32 - prevX * 32) * 128</code>
+
  | True if the map has been locked in a cartography table
 +
|-  
 +
|colspan="2"| Icon Count
 +
|colspan="2"| VarInt
 +
| Number of elements in the following array
 
  |-
 
  |-
  | Delta Y
+
  |rowspan="6"| Icon
  | Short
+
| Type
  | Change in Y position as <code>(currentY * 32 - prevY * 32) * 128</code>
+
|rowspan="6"| Array
 +
  | VarInt enum
 +
  | See below
 
  |-
 
  |-
  | Delta Z
+
  | X
  | Short
+
  | Byte
  | Change in Z position as <code>(currentZ * 32 - prevZ * 32) * 128</code>
+
  | Map coordinates: -128 for furthest left, +127 for furthest right
 
  |-
 
  |-
  | Yaw
+
  | Z
  | Angle
+
  | Byte
  | New angle, not a delta
+
  | Map coordinates: -128 for highest, +127 for lowest
 
  |-
 
  |-
  | Pitch
+
  | Direction
  | Angle
+
  | Byte
  | New angle, not a delta
+
  | 0-15
 
  |-
 
  |-
  | On Ground
+
  | Has Display Name
 
  | Boolean
 
  | Boolean
  |  
+
  |
  |}
+
  |-
 
+
| Display Name
==== Entity Rotation ====
+
| Optional [[Chat]]
 
+
| Only present if previous Boolean is true
This packet is sent by the server when an entity rotates.
+
|-
 
+
|colspan="2"| Columns
{| class="wikitable"
+
  |colspan="2"| Unsigned Byte
  ! Packet ID
+
  | Number of columns updated
  ! State
+
  |-
  ! Bound To
+
  |colspan="2"| Rows
  ! Field Name
+
  |colspan="2"| Optional Byte
  ! Field Type
+
  | Only if Columns is more than 0; number of rows updated
  ! Notes
 
 
  |-
 
  |-
  |rowspan="4"| 0x2A
+
  |colspan="2"| X
  |rowspan="4"| Play
+
  |colspan="2"| Optional Byte
|rowspan="4"| Client
+
  | Only if Columns is more than 0; x offset of the westernmost column
| Entity ID
 
| VarInt
 
  |  
 
 
  |-
 
  |-
  | Yaw
+
  |colspan="2"| Z
  | Angle
+
  |colspan="2"| Optional Byte
  | New angle, not a delta
+
  | Only if Columns is more than 0; z offset of the northernmost row
 
  |-
 
  |-
  | Pitch
+
  |colspan="2"| Length
  | Angle
+
  |colspan="2"| Optional VarInt
  | New angle, not a delta
+
  | Only if Columns is more than 0; length of the following array
 
  |-
 
  |-
  | On Ground
+
  |colspan="2"| Data
  | Boolean
+
  |colspan="2"| Optional Array of Unsigned Byte
  |  
+
  | Only if Columns is more than 0; see {{Minecraft Wiki|Map item format}}
 
  |}
 
  |}
  
==== Entity Movement ====
+
For icons, a direction of 0 is a vertical icon and increments by 22.5&deg; (360/16).
  
This packet may be used to initialize an entity.
+
Types are based off of rows and columns in <code>map_icons.png</code>:
 
 
For player entities, either this packet or any move/look packet is sent every game tick. So the meaning of this packet is basically that the entity did not move/look since the last such packet.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="1"| 0x2B
+
  ! Icon type
  |rowspan="1"| Play
+
  ! Result
  |rowspan="1"| Client
+
  |-
  | Entity ID
+
  | 0
  | VarInt
+
  | White arrow (players)
|
 
|}
 
 
 
==== Vehicle Move (clientbound) ====
 
 
 
Note that all fields use absolute positioning and do not allow for relative positioning.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="5"| 0x2C
+
  | 1
|rowspan="5"| Play
+
  | Green arrow (item frames)
|rowspan="5"| Client
 
| X
 
| Double
 
  | Absolute position (X coordinate)
 
 
  |-
 
  |-
  | Y
+
  | 2
  | Double
+
  | Red arrow
| Absolute position (Y coordinate)
 
 
  |-
 
  |-
  | Z
+
  | 3
  | Double
+
  | Blue arrow
| Absolute position (Z coordinate)
 
 
  |-
 
  |-
  | Yaw
+
  | 4
  | Float
+
  | White cross
| Absolute rotation on the vertical axis, in degrees
 
 
  |-
 
  |-
  | Pitch
+
  | 5
  | Float
+
  | Red pointer
  | Absolute rotation on the horizontal axis, in degrees
+
  |-
  |}
+
  | 6
 
+
| White circle (off-map players)
==== Open Book ====
+
  |-
 
+
  | 7
Sent when a player right clicks with a signed book. This tells the client to open the book GUI.
+
  | Small white circle (far-off-map players)
 
 
{| class="wikitable"
 
  ! Packet ID
 
  ! State
 
  ! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="1"| 0x2D
+
  | 8
|rowspan="1"| Play
+
  | Mansion
|rowspan="1"| Client
 
| Hand
 
| VarInt enum
 
  | 0: Main hand, 1: Off hand
 
|}
 
 
 
==== Open Window ====
 
 
 
This is sent to the client when it should open an inventory, such as a chest, workbench, or furnace. This message is not sent anywhere for clients opening their own inventory.  For horses, use [[#Open Horse Window|Open Horse Window]].
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x2E
+
  | 9
|rowspan="3"| Play
+
  | Temple
|rowspan="3"| Client
 
| Window ID
 
| VarInt
 
  | A unique id number for the window to be displayed. Notchian server implementation is a counter, starting at 1.
 
 
  |-
 
  |-
  | Window Type
+
  | 10
  | VarInt
+
  | White Banner
| The window type to use for display. Contained in the <code>minecraft:menu</code> regisry; see [[Inventory]] for the different values.
 
 
  |-
 
  |-
  | Window Title
+
  | 11
  | [[Chat]]
+
  | Orange Banner
  | The title of the window
+
  |-
  |}
+
| 12
 
+
| Magenta Banner
==== Open Sign Editor ====
+
|-
 +
| 13
 +
| Light Blue Banner
 +
|-
 +
| 14
 +
| Yellow Banner
 +
|-
 +
| 15
 +
| Lime Banner
 +
|-
 +
| 16
 +
| Pink Banner
 +
|-
 +
| 17
 +
| Gray Banner
 +
|-
 +
| 18
 +
| Light Gray Banner
 +
|-
 +
| 19
 +
| Cyan Banner
 +
|-
 +
| 20
 +
| Purple Banner
 +
|-
 +
| 21
 +
| Blue Banner
 +
|-
 +
| 22
 +
| Brown Banner
 +
|-
 +
| 23
 +
| Green Banner
 +
|-
 +
| 24
 +
| Red Banner
 +
|-
 +
| 25
 +
| Black Banner
 +
|-
 +
| 26
 +
| Treasure marker
 +
  |}
 +
 
 +
==== Trade List ====
  
Sent when the client has placed a sign and is allowed to send [[#Update Sign|Update Sign]].  There must already be a sign at the given location (which the client does not do automatically) - send a [[#Block Change|Block Change]] first.
+
The list of trades a villager NPC is offering.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,158: Line 3,302:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x2F
+
  |rowspan="18"| 0x26
  |rowspan="1"| Play
+
  |rowspan="18"| Play
  |rowspan="1"| Client
+
  |rowspan="18"| Client
| Location
 
| Position
 
|
 
|}
 
 
 
==== Craft Recipe Response ====
 
 
 
Response to the serverbound packet ([[#Craft Recipe Request|Craft Recipe Request]]), with the same recipe ID.  Appears to be used to notify the UI.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x30
+
  | colspan="2" | Window ID
  |rowspan="2"| Play
+
  | colspan="2" | VarInt
  |rowspan="2"| Client
+
  | The ID of the window that is open; this is an int rather than a byte.
| Window ID
 
| Byte
 
|
 
 
  |-
 
  |-
  | Recipe
+
  | colspan="2" | Size
  | Identifier
+
  | colspan="2" | Byte
| A recipe ID
+
  | The number of trades in the following array
  |}
 
 
 
==== Player Abilities (clientbound) ====
 
 
 
The latter 2 floats are used to indicate the field of view and flying speed respectively, while the first byte is used to determine the value of 4 booleans.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x31
+
  | rowspan="11" | Trades
  |rowspan="3"| Play
+
| Input item 1
  |rowspan="3"| Client
+
  | rowspan="11" | Array
  | Flags
+
| [[Slot]]
  | Byte
+
  | The first item the villager is buying
  | Bit field, see below
+
|-
 +
  | Output item
 +
  | [[Slot]]
 +
  | The item the villager is selling
 
  |-
 
  |-
  | Flying Speed
+
  | Has second item
  | Float
+
  | Boolean
  | 0.05 by default
+
  | Whether there is a second item
 
  |-
 
  |-
  | Field of View Modifier
+
  | Input item 2
  | Float
+
  | Optional [[Slot]]
| Modifies the field of view, like a speed potion. A Notchian server will use the same value as the movement speed sent in the [[Protocol#Entity_Properties|Entity Properties]] packet, which defaults to 0.1 for players.
+
  | The second item the villager is buying; only present if they have a second item.
  |}
 
 
 
About the flags:
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
  ! Field
+
  | Trade disabled
  ! Bit
+
  | Boolean
 +
| True if the trade is disabled; false if the trade is enabled.
 
  |-
 
  |-
  | Invulnerable
+
  | Number of trade uses
  | 0x01
+
  | Integer
 +
| Number of times the trade has been used so far
 
  |-
 
  |-
  | Flying
+
  | Maximum number of trade uses
  | 0x02
+
  | Integer
 +
| Number of times this trade can be used
 
  |-
 
  |-
  | Allow Flying
+
  | XP
  | 0x04
+
| Integer
 +
  |
 
  |-
 
  |-
  | Creative Mode (Instant Break)
+
  | Special Price
  | 0x08
+
| Integer
  |}
+
|
 
+
|-
==== Combat Event ====
+
| Price Multiplier
 
+
| Float
{| class="wikitable"
+
|
 +
|-
 +
| Demand
 +
| Integer
 +
|
 +
|-
 +
|colspan="2"| Villager level
 +
|colspan="2"| VarInt
 +
| Appears on the trade GUI; meaning comes from the translation key <code>merchant.level.</code> + level.
 +
1: Novice, 2: Apprentice, 3: Journeyman, 4: Expert, 5: Master
 +
|-
 +
|colspan="2"| Experience
 +
|colspan="2"| VarInt
 +
| Total experience for this villager (always 0 for the wandering trader)
 +
  |-
 +
|colspan="2"| Is regular villager
 +
|colspan="2"| Boolean
 +
| True if this is a regular villager; false for the wandering trader.  When false, hides the villager level and some other GUI elements.
 +
|-
 +
|colspan="2"| Can restock
 +
|colspan="2"| Boolean
 +
| True for regular villagers and false for the wandering trader.  If true, the "Villagers restock up to two times per day." message is displayed when hovering over disabled trades.
 +
  |}
 +
 
 +
[[File:1.14-merchant-slots.png|thumb|The merchant UI, for reference]]
 +
{{-}}
 +
 
 +
==== Entity Position ====
 +
 
 +
This packet is sent by the server when an entity moves less then 8 blocks; if an entity moves more than 8 blocks [[#Entity Teleport|Entity Teleport]] should be sent instead.
 +
 
 +
This packet allows at most 8 blocks movement in any direction, because short range is from -32768 to 32767. And <code>32768 / (128 * 32)</code> = 8.
 +
 
 +
{| class="wikitable"
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="8"| 0x32
+
  |rowspan="5"| 0x27
  |rowspan="8"| Play
+
  |rowspan="5"| Play
  |rowspan="8"| Client
+
  |rowspan="5"| Client
  |colspan="2"| Event
+
  | Entity ID
  | VarInt Enum
+
  | VarInt
  | Determines the layout of the remaining packet
+
  |  
 
  |-
 
  |-
  ! Event
+
  | Delta X
  ! Field Name
+
  | Short
  !
+
  | Change in X position as <code>(currentX * 32 - prevX * 32) * 128</code>
!
 
 
  |-
 
  |-
  | 0: enter combat
+
  | Delta Y
  | ''no fields''
+
  | Short
| ''no fields''
+
  | Change in Y position as <code>(currentY * 32 - prevY * 32) * 128</code>
  |  
 
 
  |-
 
  |-
  |rowspan="2"| 1: end combat
+
  | Delta Z
| Duration
+
  | Short
  | VarInt
+
  | Change in Z position as <code>(currentZ * 32 - prevZ * 32) * 128</code>
  |  
 
 
  |-
 
  |-
  | Entity ID
+
  | On Ground
  | Int
+
  | Boolean
|
 
|-
 
|rowspan="3"| 2: entity dead
 
| Player ID
 
| VarInt
 
|
 
|-
 
| Entity ID
 
| Int
 
|
 
|-
 
| Message
 
| [[Chat]]
 
 
  |  
 
  |  
 
  |}
 
  |}
  
==== Player Info ====
+
==== Entity Position and Rotation ====
  
Sent by the server to update the user list (<tab> in the client).
+
This packet is sent by the server when an entity rotates and moves. Since a short range is limited from -32768 to 32767, and movement is offset of fixed-point numbers, this packet allows at most 8 blocks movement in any direction. (<code>-32768 / (32 * 128) == -8</code>)
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,300: Line 3,431:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="4"| Field Name
+
  ! Field Name
  !colspan="3"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="19"| 0x33
+
  |rowspan="7"| 0x28
  |rowspan="19"| Play
+
  |rowspan="7"| Play
  |rowspan="19"| Client
+
  |rowspan="7"| Client
  |colspan="4"| Action
+
  | Entity ID
  |colspan="3"| VarInt
+
  | VarInt
  | Determines the rest of the Player format after the UUID
+
  |  
 
  |-
 
  |-
  |colspan="4"| Number Of Players
+
  | Delta X
  |colspan="3"| VarInt
+
  | Short
  | Number of elements in the following array
+
  | Change in X position as <code>(currentX * 32 - prevX * 32) * 128</code>
 
  |-
 
  |-
  |rowspan="17"| Player
+
  | Delta Y
|colspan="3"| UUID
+
  | Short
  |rowspan="17"| Array
+
  | Change in Y position as <code>(currentY * 32 - prevY * 32) * 128</code>
|colspan="2"| UUID
 
  |  
 
 
  |-
 
  |-
  ! Action
+
  | Delta Z
  !colspan="2"| Field Name
+
  | Short
  !colspan="2"|  
+
  | Change in Z position as <code>(currentZ * 32 - prevZ * 32) * 128</code>
!
 
 
  |-
 
  |-
  |rowspan="10"| 0: add player
+
  | Yaw
|colspan="2"| Name
+
  | Angle
  |colspan="2"| String (16)
+
  | New angle, not a delta
  |  
 
 
  |-
 
  |-
  |colspan="2"| Number Of Properties
+
  | Pitch
  |colspan="2"| VarInt
+
  | Angle
  | Number of elements in the following array
+
  | New angle, not a delta
 
  |-
 
  |-
  |rowspan="4"| Property
+
  | On Ground
| Name
 
|rowspan="4"| Array
 
| String (32767)
 
|
 
|-
 
| Value
 
| String (32767)
 
|
 
|-
 
| Is Signed
 
 
  | Boolean
 
  | Boolean
 
  |  
 
  |  
 +
|}
 +
 +
==== Entity Rotation ====
 +
 +
This packet is sent by the server when an entity rotates.
 +
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | Signature
+
  |rowspan="4"| 0x29
| Optional String (32767)
+
  |rowspan="4"| Play
  | Only if Is Signed is true
+
  |rowspan="4"| Client
|-
+
  | Entity ID
  |colspan="2"| Gamemode
+
| VarInt
  |colspan="2"| VarInt
 
 
  |  
 
  |  
 
  |-
 
  |-
  |colspan="2"| Ping
+
  | Yaw
  |colspan="2"| VarInt
+
  | Angle
  | Measured in milliseconds
+
  | New angle, not a delta
 
  |-
 
  |-
  |colspan="2"| Has Display Name
+
  | Pitch
  |colspan="2"| Boolean
+
  | Angle
  |  
+
  | New angle, not a delta
 
  |-
 
  |-
  |colspan="2"| Display Name
+
  | On Ground
|colspan="2"| Optional [[Chat]]
+
  | Boolean
| Only if Has Display Name is true
 
|-
 
| 1: update gamemode
 
  |colspan="2"| Gamemode
 
|colspan="2"| VarInt
 
|
 
|-
 
| 2: update latency
 
|colspan="2"| Ping
 
|colspan="2"| VarInt
 
| Measured in milliseconds
 
|-
 
|rowspan="2"| 3: update display name
 
|colspan="2"| Has Display Name
 
|colspan="2"| Boolean
 
|
 
|-
 
|colspan="2"| Display Name
 
|colspan="2"| Optional [[Chat]]
 
| Only send if Has Display Name is true
 
|-
 
| 4: remove player
 
|colspan="2"| ''no fields''
 
|colspan="2"| ''no fields''
 
 
  |  
 
  |  
 
  |}
 
  |}
  
The Property field looks as in the response of [[Mojang API#UUID -> Profile + Skin/Cape]], except of course using the protocol format instead of JSON. That is, each player will usually have one property with Name “textures” and Value being a base64-encoded JSON string as documented at [[Mojang API#UUID -> Profile + Skin/Cape]]. An empty properties array is also acceptable, and will cause clients to display the player with one of the two default skins depending on UUID.
+
==== Entity Movement ====
  
Ping values correspond with icons in the following way:
+
This packet may be used to initialize an entity.
* A ping that negative (i.e. not known to the server yet) will result in the no connection icon.
+
 
* A ping under 150 milliseconds will result in 5 bars
+
For player entities, either this packet or any move/look packet is sent every game tick. So the meaning of this packet is basically that the entity did not move/look since the last such packet.
* A ping under 300 milliseconds will result in 4 bars
+
 
* A ping under 600 milliseconds will result in 3 bars
+
{| class="wikitable"
* A ping under 1000 milliseconds (1 second) will result in 2 bars
+
! Packet ID
* A ping greater than or equal to 1 second will result in 1 bar.
+
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
| 0x2A
 +
| Play
 +
| Client
 +
| Entity ID
 +
| VarInt
 +
|
 +
|}
  
==== Face Player ====
+
==== Vehicle Move (clientbound) ====
  
Used to rotate the client player to face the given location or entity (for <code>/teleport [<targets>] <x> <y> <z> facing</code>).
+
Note that all fields use absolute positioning and do not allow for relative positioning.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,416: Line 3,533:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="8"| 0x34
+
  |rowspan="5"| 0x2B
  |rowspan="8"| Play
+
  |rowspan="5"| Play
  |rowspan="8"| Client
+
  |rowspan="5"| Client
  |-
+
  | X
| Feet/eyes
 
| VarInt enum
 
| Values are feet=0, eyes=1.  If set to eyes, aims using the head position; otherwise aims using the feet position.
 
|-
 
| Target x
 
 
  | Double
 
  | Double
  | x coordinate of the point to face towards
+
  | Absolute position (X coordinate)
 
  |-
 
  |-
  | Target y
+
  | Y
 
  | Double
 
  | Double
  | y coordinate of the point to face towards
+
  | Absolute position (Y coordinate)
 
  |-
 
  |-
  | Target z
+
  | Z
 
  | Double
 
  | Double
  | z coordinate of the point to face towards
+
  | Absolute position (Z coordinate)
 
  |-
 
  |-
  | Is entity
+
  | Yaw
  | Boolean
+
  | Float
  | If true, additional information about an entity is provided.
+
  | Absolute rotation on the vertical axis, in degrees
 
  |-
 
  |-
  | Entity ID
+
  | Pitch
  | Optional VarInt
+
  | Float
  | Only if is entity is true &mdash; the entity to face towards
+
  | Absolute rotation on the horizontal axis, in degrees
|-
 
| Entity feet/eyes
 
| Optional VarInt enum
 
| Whether to look at the entity's eyes or feet.  Same values and meanings as before, just for the entity's head/feet.
 
 
  |}
 
  |}
  
If the entity given by entity ID cannot be found, this packet should be treated as if is entity was false.
+
==== Open Book ====
  
==== Player Position And Look (clientbound) ====
+
Sent when a player right clicks with a signed book. This tells the client to open the book GUI.
  
Updates the player's position on the server. This packet will also close the “Downloading Terrain” screen when joining/respawning.
+
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
| 0x2C
 +
| Play
 +
| Client
 +
| Hand
 +
| VarInt enum
 +
| 0: Main hand, 1: Off hand
 +
|}
  
If the distance between the last known position of the player on the server and the new position set by this packet is greater than 100 meters, the client will be kicked for “You moved too quickly :( (Hacking?)”.
+
==== Open Window ====
  
Also if the fixed-point number of X or Z is set greater than <code>3.2E7D</code> the client will be kicked for “Illegal position”.
+
This is sent to the client when it should open an inventory, such as a chest, workbench, or furnace. This message is not sent anywhere for clients opening their own inventory. For horses, use [[#Open Horse Window|Open Horse Window]].
 
 
Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0, -1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.
 
 
 
Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,471: Line 3,589:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="7"| 0x35
+
  |rowspan="3"| 0x2D
  |rowspan="7"| Play
+
  |rowspan="3"| Play
  |rowspan="7"| Client
+
  |rowspan="3"| Client
  | X
+
  | Window ID
  | Double
+
  | VarInt
  | Absolute or relative position, depending on Flags
+
  | A unique id number for the window to be displayed. Notchian server implementation is a counter, starting at 1.
 
  |-
 
  |-
  | Y
+
  | Window Type
  | Double
+
  | VarInt
  | Absolute or relative position, depending on Flags
+
  | The window type to use for display. Contained in the <code>minecraft:menu</code> regisry; see [[Inventory]] for the different values.
 
  |-
 
  |-
  | Z
+
  | Window Title
  | Double
+
  | [[Chat]]
| Absolute or relative position, depending on Flags
+
| The title of the window
|-
 
| Yaw
 
| Float
 
| Absolute or relative rotation on the X axis, in degrees
 
|-
 
| Pitch
 
| Float
 
| Absolute or relative rotation on the Y axis, in degrees
 
|-
 
| Flags
 
| Byte
 
| Bit field, see below
 
|-
 
| Teleport ID
 
| VarInt
 
| Client should confirm this packet with [[#Teleport Confirm|Teleport Confirm]] containing the same Teleport ID
 
 
  |}
 
  |}
  
About the Flags field:
+
==== Open Sign Editor ====
  
  <Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
+
Sent when the client has placed a sign and is allowed to send [[#Update Sign|Update Sign]]. There must already be a sign at the given location (which the client does not do automatically) - send a [[#Block Change|Block Change]] first.
 
 
{| class="wikitable"
 
|-
 
! Field
 
! Bit
 
|-
 
| X
 
| 0x01
 
|-
 
| Y
 
| 0x02
 
|-
 
| Z
 
| 0x04
 
|-
 
| Y_ROT
 
| 0x08
 
|-
 
| X_ROT
 
| 0x10
 
|}
 
 
 
==== Unlock Recipes ====
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,538: Line 3,617:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="10"| 0x36
+
  | 0x2E
  |rowspan="10"| Play
+
  | Play
  |rowspan="10"| Client
+
  | Client
  |-
+
  | Location
| Action
+
  | Position
| VarInt
+
  |  
| 0: init, 1: add, 2: remove
 
|-
 
| Crafting Recipe Book Open
 
| Boolean
 
| If true, then the crafting recipe book will be open when the player opens its inventory.
 
|-
 
| Crafting Recipe Book Filter Active
 
| Boolean
 
| If true, then the filtering option is active when the players opens its inventory.
 
|-
 
| Smelting Recipe Book Open
 
| Boolean
 
| If true, then the smelting recipe book will be open when the player opens its inventory.
 
|-
 
| Smelting Recipe Book Filter Active
 
| Boolean
 
| If true, then the filtering option is active when the players opens its inventory.
 
|-
 
| Array size 1
 
| VarInt
 
| Number of elements in the following array
 
|-
 
| Recipe IDs
 
| Array of Identifier
 
|
 
|-
 
| Array size 2
 
| Optional VarInt
 
| Number of elements in the following array, only present if mode is 0 (init)
 
|-
 
| Recipe IDs
 
  | Optional Array of Identifier, only present if mode is 0 (init)
 
  |
 
 
  |}
 
  |}
Action:
 
* 0 (init) = All the recipes in the list 2 will added to the recipe book. All the recipes in list 1 will be tagged as displayed, recipes that aren't tagged will be shown in the notification. VERIFY LIST ORDER?
 
* 1 (add) = All the recipes in the list are added and their icon will be shown in the notification.
 
* 2 (remove) = Remove all the recipes in the list. This allows them to re-displayed when they are readded.
 
  
==== Destroy Entities ====
+
==== Craft Recipe Response ====
  
Sent by the server when a list of entities is to be destroyed on the client.
+
Response to the serverbound packet ([[#Craft Recipe Request|Craft Recipe Request]]), with the same recipe ID.  Appears to be used to notify the UI.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,595: Line 3,637:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x37
+
  |rowspan="2"| 0x2F
 
  |rowspan="2"| Play
 
  |rowspan="2"| Play
 
  |rowspan="2"| Client
 
  |rowspan="2"| Client
  | Count
+
  | Window ID
  | VarInt
+
  | Byte
  | Number of elements in the following array
+
  |
 
  |-
 
  |-
  | Entity IDs
+
  | Recipe
  | Array of VarInt
+
  | Identifier
  | The list of entities of destroy
+
  | A recipe ID
 
  |}
 
  |}
  
==== Remove Entity Effect ====
+
==== Player Abilities (clientbound) ====
 +
 
 +
The latter 2 floats are used to indicate the field of view and flying speed respectively, while the first byte is used to determine the value of 4 booleans.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,617: Line 3,661:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x38
+
  |rowspan="3"| 0x30
  |rowspan="2"| Play
+
  |rowspan="3"| Play
  |rowspan="2"| Client
+
  |rowspan="3"| Client
  | Entity ID
+
  | Flags
  | VarInt
+
| Byte
  |  
+
| Bit field, see below
 +
|-
 +
| Flying Speed
 +
| Float
 +
| 0.05 by default
 +
|-
 +
| Field of View Modifier
 +
| Float
 +
| Modifies the field of view, like a speed potion. A Notchian server will use the same value as the movement speed sent in the [[#Entity_Properties|Entity Properties]] packet, which defaults to 0.1 for players.
 +
|}
 +
 
 +
About the flags:
 +
 
 +
{| class="wikitable"
 +
|-
 +
! Field
 +
! Bit
 +
|-
 +
| Invulnerable
 +
| 0x01
 +
|-
 +
| Flying
 +
| 0x02
 +
|-
 +
  | Allow Flying
 +
  | 0x04
 
  |-
 
  |-
  | Effect ID
+
  | Creative Mode (Instant Break)
  | Byte
+
  | 0x08
| See {{Minecraft Wiki|Status effect#List of effects|this table}}
 
 
  |}
 
  |}
  
==== Resource Pack Send ====  
+
==== Combat Event ====
 +
 
 +
Originally used for metadata for twitch streaming circa 1.8.  Now only used to display the game over screen (with enter combat and end combat completely ignored by the Notchain client)
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,635: Line 3,705:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x39
+
  |rowspan="8"| 0x31
  |rowspan="2"| Play
+
|rowspan="8"| Play
  |rowspan="2"| Client
+
|rowspan="8"| Client
  | URL
+
|colspan="2"| Event
  | String (32767)
+
| VarInt Enum
  | The URL to the resource pack.
+
| Determines the layout of the remaining packet
 +
|-
 +
! Event
 +
! Field Name
 +
!
 +
!
 +
|-
 +
| 0: enter combat
 +
| ''no fields''
 +
| ''no fields''
 +
|
 +
|-
 +
  |rowspan="2"| 1: end combat
 +
| Duration
 +
| VarInt
 +
| Length of the combat in ticks.
 +
|-
 +
| Entity ID
 +
| Int
 +
| ID of the primary opponent of the ended combat, or -1 if there is no obvious primary opponent.
 +
|-
 +
  |rowspan="3"| 2: entity dead
 +
| Player ID
 +
  | VarInt
 +
  | Entity ID of the player that died (should match the client's entity ID).
 +
|-
 +
| Entity ID
 +
| Int
 +
  | The killing entity's ID, or -1 if there is no obvious killer.
 
  |-
 
  |-
  | Hash
+
  | Message
  | String (40)
+
  | [[Chat]]
| A 40 character hexadecimal and lowercase [[wikipedia:SHA-1|SHA-1]] hash of the resource pack file. (must be lower case in order to work)<br />If it's not a 40 character hexadecimal string, the client will not use it for hash verification and likely waste bandwidth — but it will still treat it as a unique id
+
| The death message
 
  |}
 
  |}
  
==== Respawn ====
+
==== Player Info ====
  
To change the player's dimension (overworld/nether/end), send them a respawn packet with the appropriate dimension, followed by prechunks/chunks for the new dimension, and finally a position and look packet. You do not need to unload chunks, the client will do it automatically.
+
Sent by the server to update the user list (<tab> in the client).
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,659: Line 3,757:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="4"| Field Name
  ! Field Type
+
  !colspan="3"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x3A
+
  |rowspan="19"| 0x32
  |rowspan="3"| Play
+
  |rowspan="19"| Play
  |rowspan="3"| Client
+
  |rowspan="19"| Client
  | Dimension
+
  |colspan="4"| Action
  | Int Enum
+
  |colspan="3"| VarInt
  | -1: The Nether, 0: The Overworld, 1: The End
+
  | Determines the rest of the Player format after the UUID
 
  |-
 
  |-
  | Gamemode
+
  |colspan="4"| Number Of Players
  | Unsigned Byte
+
|colspan="3"| VarInt
  | 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included
+
| Number of elements in the following array
 +
  |-
 +
  |rowspan="17"| Player
 +
|colspan="3"| UUID
 +
|rowspan="17"| Array
 +
|colspan="2"| UUID
 +
|
 
  |-
 
  |-
  | Level Type
+
  ! Action
  | String (16)
+
  !colspan="2"| Field Name
| Same as [[#Join Game|Join Game]]
+
  !colspan="2"|
|}
+
  !  
 
 
{{Warning2|Avoid changing player's dimension to same dimension they were already in unless they are dead. If you change the dimension to one they are already in, weird bugs can occur, such as the player being unable to attack other players in new world (until they die and respawn).
 
 
 
If you must respawn a player in the same dimension without killing them, send two respawn packets, one to a different world and then another to the world you want. You do not need to complete the first respawn; it only matters that you send two packets.}}
 
 
 
==== Entity Head Look ====
 
 
 
Changes the direction an entity's head is facing.
 
 
 
While sending the Entity Look packet changes the vertical rotation of the head, sending this packet appears to be necessary to rotate the head horizontally.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
  ! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x3B
+
  |rowspan="10"| 0: add player
  |rowspan="2"| Play
+
  |colspan="2"| Name
  |rowspan="2"| Client
+
  |colspan="2"| String (16)
| Entity ID
 
| VarInt
 
 
  |  
 
  |  
 
  |-
 
  |-
  | Head Yaw
+
  |colspan="2"| Number Of Properties
  | Angle
+
  |colspan="2"| VarInt
| New angle, not a delta
+
  | Number of elements in the following array
  |}
+
|-
 
+
|rowspan="4"| Property
==== Select Advancement Tab ====
+
  | Name
 
+
  |rowspan="4"| Array
Sent by the server to indicate that the client should switch advancement tab. Sent either when the client switches tab in the GUI or when an advancement in another tab is made.
+
  | String (32767)
 
+
  |
{| class="wikitable"
 
  ! Packet ID
 
  ! State
 
  ! Bound To
 
  ! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x3C
+
  | Value
  |rowspan="2"| Play
+
| String (32767)
  |rowspan="2"| Client
+
  |  
  | Has id
+
  |-
 +
  | Is Signed
 
  | Boolean
 
  | Boolean
  | Indicates if the next field is present
+
  |  
 
  |-
 
  |-
  | Optional Identifier
+
  | Signature
  | String (32767)
+
  | Optional String (32767)
  | See below
+
  | Only if Is Signed is true
|}
 
 
 
The Identifier can be one of the following:
 
 
 
{| class="wikitable"
 
! Optional Identifier
 
 
  |-
 
  |-
  | minecraft:story/root
+
  |colspan="2"| Gamemode
 +
|colspan="2"| VarInt
 +
|
 
  |-
 
  |-
  | minecraft:nether/root
+
  |colspan="2"| Ping
 +
|colspan="2"| VarInt
 +
| Measured in milliseconds
 
  |-
 
  |-
  | minecraft:end/root
+
  |colspan="2"| Has Display Name
 +
|colspan="2"| Boolean
 +
|
 
  |-
 
  |-
  | minecraft:adventure/root
+
  |colspan="2"| Display Name
 +
|colspan="2"| Optional [[Chat]]
 +
| Only if Has Display Name is true
 +
|-
 +
| 1: update gamemode
 +
|colspan="2"| Gamemode
 +
|colspan="2"| VarInt
 +
|
 +
|-
 +
| 2: update latency
 +
|colspan="2"| Ping
 +
|colspan="2"| VarInt
 +
| Measured in milliseconds
 
  |-
 
  |-
  | minecraft:husbandry/root
+
  |rowspan="2"| 3: update display name
 +
|colspan="2"| Has Display Name
 +
|colspan="2"| Boolean
 +
|
 +
|-
 +
|colspan="2"| Display Name
 +
|colspan="2"| Optional [[Chat]]
 +
| Only send if Has Display Name is true
 +
|-
 +
| 4: remove player
 +
|colspan="2"| ''no fields''
 +
|colspan="2"| ''no fields''
 +
|
 
  |}
 
  |}
  
If no or an invalid identifier is sent, the client will switch to the first tab in the GUI.
+
The Property field looks as in the response of [[Mojang API#UUID -> Profile + Skin/Cape]], except of course using the protocol format instead of JSON. That is, each player will usually have one property with Name “textures” and Value being a base64-encoded JSON string as documented at [[Mojang API#UUID -> Profile + Skin/Cape]]. An empty properties array is also acceptable, and will cause clients to display the player with one of the two default skins depending on UUID.
 +
 
 +
Ping values correspond with icons in the following way:
 +
* A ping that negative (i.e. not known to the server yet) will result in the no connection icon.
 +
* A ping under 150 milliseconds will result in 5 bars
 +
* A ping under 300 milliseconds will result in 4 bars
 +
* A ping under 600 milliseconds will result in 3 bars
 +
* A ping under 1000 milliseconds (1 second) will result in 2 bars
 +
* A ping greater than or equal to 1 second will result in 1 bar.
 +
 
 +
==== Face Player ====
  
==== World Border ====
+
Used to rotate the client player to face the given location or entity (for <code>/teleport [<targets>] <x> <y> <z> facing</code>).
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,757: Line 3,869:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="18"| 0x3D
+
  |rowspan="8"| 0x33
  |rowspan="18"| Play
+
  |rowspan="8"| Play
  |rowspan="18"| Client
+
  |rowspan="8"| Client
|colspan="2"| Action
 
| VarInt Enum
 
| Determines the format of the rest of the packet
 
 
  |-
 
  |-
  ! Action
+
  | Feet/eyes
  ! Field Name
+
  | VarInt enum
  !
+
  | Values are feet=0, eyes=1. If set to eyes, aims using the head position; otherwise aims using the feet position.
  !
 
 
  |-
 
  |-
  | 0: set size
+
  | Target x
| Diameter
 
 
  | Double
 
  | Double
  | Length of a single side of the world border, in meters
+
  | x coordinate of the point to face towards
 
  |-
 
  |-
  |rowspan="3"| 1: lerp size
+
  | Target y
| Old Diameter
 
 
  | Double
 
  | Double
  | Current length of a single side of the world border, in meters
+
  | y coordinate of the point to face towards
 
  |-
 
  |-
  | New Diameter
+
  | Target z
 
  | Double
 
  | Double
  | Target length of a single side of the world border, in meters
+
  | z coordinate of the point to face towards
 
  |-
 
  |-
  | Speed
+
  | Is entity
  | VarLong
+
  | Boolean
  | Number of real-time ''milli''seconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.
+
  | If true, additional information about an entity is provided.
 
  |-
 
  |-
  |rowspan="2"| 2: set center
+
  | Entity ID
| X
+
  | Optional VarInt
  | Double
+
  | Only if is entity is true &mdash; the entity to face towards
  |  
 
 
  |-
 
  |-
  | Z
+
  | Entity feet/eyes
  | Double
+
  | Optional VarInt enum
  |  
+
  | Whether to look at the entity's eyes or feet.  Same values and meanings as before, just for the entity's head/feet.
  |-
+
  |}
|rowspan="8"| 3: initialize
+
 
| X
+
If the entity given by entity ID cannot be found, this packet should be treated as if is entity was false.
  | Double
+
 
  |
+
==== Player Position And Look (clientbound) ====
  |-
+
 
  | Z
+
Updates the player's position on the server. This packet will also close the “Downloading Terrain” screen when joining/respawning.
  | Double
+
 
  |
+
If the distance between the last known position of the player on the server and the new position set by this packet is greater than 100 meters, the client will be kicked for “You moved too quickly :( (Hacking?)”.
 +
 
 +
Also if the fixed-point number of X or Z is set greater than <code>3.2E7D</code> the client will be kicked for “Illegal position”.
 +
 
 +
Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0, -1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.
 +
 
 +
Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.
 +
 
 +
{| class="wikitable"
 +
  ! Packet ID
 +
  ! State
 +
  ! Bound To
 +
  ! Field Name
 +
  ! Field Type
 +
  ! Notes
 
  |-
 
  |-
  | Old Diameter
+
  |rowspan="7"| 0x34
 +
|rowspan="7"| Play
 +
|rowspan="7"| Client
 +
| X
 
  | Double
 
  | Double
  | Current length of a single side of the world border, in meters
+
  | Absolute or relative position, depending on Flags
 
  |-
 
  |-
  | New Diameter
+
  | Y
 
  | Double
 
  | Double
  | Target length of a single side of the world border, in meters
+
  | Absolute or relative position, depending on Flags
 
  |-
 
  |-
  | Speed
+
  | Z
  | VarLong
+
  | Double
  | Number of real-time ''milli''seconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.
+
  | Absolute or relative position, depending on Flags
 
  |-
 
  |-
  | Portal Teleport Boundary
+
  | Yaw
  | VarInt
+
  | Float
  | Resulting coordinates from a portal teleport are limited to ±value. Usually 29999984.
+
  | Absolute or relative rotation on the X axis, in degrees
 
  |-
 
  |-
  | Warning Time
+
  | Pitch
  | VarInt
+
  | Float
  | In seconds as set by <code>/worldborder warning time</code>
+
  | Absolute or relative rotation on the Y axis, in degrees
 
  |-
 
  |-
  | Warning Blocks
+
  | Flags
  | VarInt
+
  | Byte
  | In meters
+
  | Bit field, see below
 
  |-
 
  |-
  |rowspan="1"| 4: set warning time
+
  | Teleport ID
| Warning Time
 
 
  | VarInt
 
  | VarInt
  | In seconds as set by <code>/worldborder warning time</code>
+
  | Client should confirm this packet with [[#Teleport Confirm|Teleport Confirm]] containing the same Teleport ID
|-
+
  |}
  |rowspan="1"| 5: set warning blocks
+
 
| Warning Blocks
+
About the Flags field:
| VarInt
 
| In meters
 
|}
 
  
The Notchian client determines how solid to display the warning by comparing to whichever is higher, the warning distance or whichever is lower, the distance from the current diameter to the target diameter or the place the border will be after warningTime seconds. In pseudocode:
+
<Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
  
<syntaxhighlight lang="java">
+
{| class="wikitable"
distance = max(min(resizeSpeed * 1000 * warningTime, abs(targetDiameter - currentDiameter)), warningDistance);
+
|-
if (playerDistance < distance) {
+
! Field
    warning = 1.0 - playerDistance / distance;
+
! Bit
} else {
+
|-
    warning = 0.0;
+
| X
}
+
| 0x01
</syntaxhighlight>
+
|-
 +
| Y
 +
| 0x02
 +
|-
 +
| Z
 +
| 0x04
 +
|-
 +
| Y_ROT
 +
| 0x08
 +
|-
 +
| X_ROT
 +
| 0x10
 +
|}
  
==== Camera ====
+
==== Unlock Recipes ====
 
 
Sets the entity that the player renders from. This is normally used when the player left-clicks an entity while in spectator mode.
 
 
 
The player's camera will move with the entity and look where it is looking. The entity is often another player, but can be any type of entity.  The player is unable to move this entity (move packets will act as if they are coming from the other entity).
 
 
 
If the given entity is not loaded by the player, this packet is ignored.  To return control to the player, send this packet with their entity ID.
 
 
 
The Notchian server resets this (sends it back to the default entity) whenever the spectated entity is killed or the player sneaks, but only if they were spectating an entity. It also sends this packet whenever the player switches out of spectator mode (even if they weren't spectating an entity).
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,873: Line 3,995:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x3E
+
  |rowspan="14"| 0x35
  |rowspan="1"| Play
+
  |rowspan="14"| Play
  |rowspan="1"| Client
+
  |rowspan="14"| Client
  | Camera ID
+
  |-
 +
| Action
 
  | VarInt
 
  | VarInt
  | ID of the entity to set the client's camera to
+
  | 0: init, 1: add, 2: remove
  |}
+
|-
 +
| Crafting Recipe Book Open
 +
| Boolean
 +
| If true, then the crafting recipe book will be open when the player opens its inventory.
 +
|-
 +
| Crafting Recipe Book Filter Active
 +
| Boolean
 +
| If true, then the filtering option is active when the players opens its inventory.
 +
|-
 +
| Smelting Recipe Book Open
 +
| Boolean
 +
| If true, then the smelting recipe book will be open when the player opens its inventory.
 +
|-
 +
| Smelting Recipe Book Filter Active
 +
| Boolean
 +
| If true, then the filtering option is active when the players opens its inventory.
 +
|-
 +
| Blast Furance Recipe Book Open
 +
| Boolean
 +
| If true, then the blast furnace recipe book will be open when the player opens its inventory.
 +
|-
 +
| Blast Furance Recipe Book Filter Active
 +
| Boolean
 +
| If true, then the filtering option is active when the players opens its inventory.
 +
|-
 +
| Smoker Recipe Book Open
 +
| Boolean
 +
| If true, then the smoker recipe book will be open when the player opens its inventory.
 +
|-
 +
| Smoker Recipe Book Filter Active
 +
| Boolean
 +
| If true, then the filtering option is active when the players opens its inventory.
 +
|-
 +
| Array size 1
 +
| VarInt
 +
| Number of elements in the following array
 +
|-
 +
| Recipe IDs
 +
| Array of Identifier
 +
|
 +
|-
 +
| Array size 2
 +
| Optional VarInt
 +
| Number of elements in the following array, only present if mode is 0 (init)
 +
|-
 +
| Recipe IDs
 +
| Optional Array of Identifier, only present if mode is 0 (init)
 +
|
 +
  |}
 +
Action:
 +
* 0 (init) = All the recipes in the list 2 will added to the recipe book. All the recipes in list 1 will be tagged as displayed, recipes that aren't tagged will be shown in the notification.
 +
* 1 (add) = All the recipes in the list are added and their icon will be shown in the notification.
 +
* 2 (remove) = Remove all the recipes in the list. This allows them to re-displayed when they are readded.
  
The notchian also loads certain shaders for given entities:
+
==== Destroy Entities ====
  
* Creeper &rarr; <code>shaders/post/creeper.json</code>
+
Sent by the server when a list of entities is to be destroyed on the client.
* Spider (and cave spider) &rarr; <code>shaders/post/spider.json</code>
 
* Enderman &rarr; <code>shaders/post/invert.json</code>
 
* Anything else &rarr; the current shader is unloaded
 
  
==== Held Item Change (clientbound) ====
+
{| class="wikitable"
 
 
Sent to change the player's slot selection.
 
 
 
{| class="wikitable"
 
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 3,900: Line 4,068:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x3F
+
  |rowspan="2"| 0x36
  |rowspan="1"| Play
+
  |rowspan="2"| Play
  |rowspan="1"| Client
+
  |rowspan="2"| Client
  | Slot
+
  | Count
  | Byte
+
  | VarInt
  | The slot which the player has selected (0–8)
+
| Number of elements in the following array
 +
|-
 +
| Entity IDs
 +
| Array of VarInt
 +
  | The list of entities of destroy
 
  |}
 
  |}
  
==== Update View Position ====
+
==== Remove Entity Effect ====
 
 
{{Need Info|Why is this even needed?  Is there a better name for it?  My guess is that it's something to do with logical behavior with latency, but it still seems weird.}}
 
 
 
Updates the client's location.  This is used to determine what chunks should remain loaded and if a chunk load should be ignored; chunks outside of the view distance may be unloaded.
 
 
 
Sent whenever the player moves across a chunk border horizontally, and also (according to testing) for any integer change in the vertical axis, even if it doesn't go across a chunk section border.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,924: Line 4,090:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x40
+
  |rowspan="2"| 0x37
 
  |rowspan="2"| Play
 
  |rowspan="2"| Play
 
  |rowspan="2"| Client
 
  |rowspan="2"| Client
  | Chunk X
+
  | Entity ID
 
  | VarInt
 
  | VarInt
  | Chunk X coordinate of the player's position
+
  |  
 
  |-
 
  |-
  | Chunk Z
+
  | Effect ID
  | VarInt
+
  | Byte
  | Chunk Z coordinate of the player's position
+
  | See {{Minecraft Wiki|Status effect#List of effects|this table}}
 
  |}
 
  |}
  
==== Update View Distance ====
+
==== Resource Pack Send ====  
 
 
Sent by the integrated singleplayer server when changing render distance.  Does not appear to be used by the dedicated server, as <code>view-distance</code> in server.properties cannot be changed at runtime.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,948: Line 4,112:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x41
+
  |rowspan="2"| 0x38
  |rowspan="1"| Play
+
  |rowspan="2"| Play
  |rowspan="1"| Client
+
  |rowspan="2"| Client
  | View Distance
+
  | URL
  | VarInt
+
| String (32767)
  | Render distance (2-32)  
+
| The URL to the resource pack.
 +
|-
 +
  | Hash
 +
  | String (40)
 +
| A 40 character hexadecimal and lowercase [[wikipedia:SHA-1|SHA-1]] hash of the resource pack file. (must be lower case in order to work)<br />If it's not a 40 character hexadecimal string, the client will not use it for hash verification and likely waste bandwidth — but it will still treat it as a unique id
 
  |}
 
  |}
  
==== Display Scoreboard ====
+
==== Respawn ====
  
This is sent to the client when it should display a scoreboard.
+
To change the player's dimension (overworld/nether/end), send them a respawn packet with the appropriate dimension, followed by prechunks/chunks for the new dimension, and finally a position and look packet. You do not need to unload chunks, the client will do it automatically.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,968: Line 4,136:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x42
+
  |rowspan="8"| 0x39
  |rowspan="2"| Play
+
  |rowspan="8"| Play
  |rowspan="2"| Client
+
  |rowspan="8"| Client
  | Position
+
  | Dimension
  | Byte
+
| [[NBT|NBT Tag Compound]]
  | The position of the scoreboard. 0: list, 1: sidebar, 2: below name, 3 - 18: team specific sidebar, indexed as 3 + team color.
+
| |Valid dimensions are defined per dimension registry sent in [[#Join Game|Join Game]]
 +
|-
 +
| World Name
 +
| Identifier
 +
| Name of the world being spawned into
 +
|-
 +
| Hashed seed
 +
  | Long
 +
  | First 8 bytes of the SHA-256 hash of the world's seed.
 +
|-
 +
| Gamemode
 +
| Unsigned Byte
 +
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included
 +
|-  
 +
| Previous Gamemode
 +
| Unsigned Byte
 +
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. (More information needed)
 +
|-
 +
| Is Debug
 +
| Boolean
 +
| True if the world is a {{Minecraft Wiki|debug mode}} world; debug mode worlds cannot be modified and have predefined blocks
 +
|-
 +
| Is Flat
 +
| Boolean
 +
| True if the world is a {{Minecraft Wiki|superflat}} world; flat worlds have different void fog and a horizon at y=0 instead of y=63
 
  |-
 
  |-
  | Score Name
+
  | Copy metadata
  | String (16)
+
  | Boolean
  | The unique name for the scoreboard to be displayed.
+
  | If false, metadata is reset on the respawned player entity.  Set to true for dimension changes (including the dimension change triggered by sending client status perform respawn to exit the end poem/credits), and false for normal respawns.
 
  |}
 
  |}
  
==== Entity Metadata ====
+
{{Need Info|Does the new World Name field resolve this same-dimension issue?}}
 +
 
 +
{{Warning2|Avoid changing player's dimension to same dimension they were already in unless they are dead. If you change the dimension to one they are already in, weird bugs can occur, such as the player being unable to attack other players in new world (until they die and respawn).
 +
 
 +
If you must respawn a player in the same dimension without killing them, send two respawn packets, one to a different world and then another to the world you want. You do not need to complete the first respawn; it only matters that you send two packets.}}
 +
 
 +
==== Entity Head Look ====
 +
 
 +
Changes the direction an entity's head is facing.
  
Updates one or more [[Entities#Entity Metadata Format|metadata]] properties for an existing entity. Any properties not included in the Metadata field are left unchanged.
+
While sending the Entity Look packet changes the vertical rotation of the head, sending this packet appears to be necessary to rotate the head horizontally.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,992: Line 4,192:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x43
+
  |rowspan="2"| 0x3A
 
  |rowspan="2"| Play
 
  |rowspan="2"| Play
 
  |rowspan="2"| Client
 
  |rowspan="2"| Client
Line 3,999: Line 4,199:
 
  |  
 
  |  
 
  |-
 
  |-
  | Metadata
+
  | Head Yaw
  | [[Entities#Entity Metadata Format|Entity Metadata]]
+
  | Angle
  |  
+
  | New angle, not a delta
 
  |}
 
  |}
 +
 +
==== Multi Block Change ====
  
==== Attach Entity ====
+
Fired whenever 2 or more blocks are changed within the same chunk on the same tick.
  
This packet is sent when an entity has been {{Minecraft Wiki|Lead|leashed}} to another entity.
+
{{Warning|Changing blocks in chunks not loaded by the client is unsafe (see note on [[#Block Change|Block Change]]).}}
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,016: Line 4,218:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x44
+
  |rowspan="4"| 0x3B
  |rowspan="2"| Play
+
  |rowspan="4"| Play
  |rowspan="2"| Client
+
  |rowspan="4"| Client
  | Attached Entity ID
+
  | Chunk section position
  | Int
+
  | Long
  | Attached entity's EID
+
  | Chunk section coordinate (encoded chunk x and z with each 22 bits, and section y with 20 bits, from left to right)
 +
|-
 +
|
 +
| Boolean
 +
| Always inverse the preceding Update Light packet's "Trust Edges" bool
 +
|
 +
|-
 +
| Blocks array size
 +
| VarInt
 +
| Number of elements in the following array
 
  |-
 
  |-
  | Holding Entity ID
+
  | Blocks
  | Int
+
  | Array of VarLong
  | ID of the entity holding the lead. Set to -1 to detach.
+
  | Each entry is composed of the block id, shifted right by 12, and the relative block position in the chunk section (4 bits for x, z, and y, from left to right).
 
  |}
 
  |}
  
==== Entity Velocity ====
+
Chunk section position is encoded:
 +
<syntaxhighlight lang="java">
 +
((sectionX & 0x3FFFFF) << 42) | (sectionY & 0xFFFFF) | ((sectionZ & 0x3FFFFF) << 20);
 +
</syntaxhighlight>
 +
and decoded:
 +
<syntaxhighlight lang="java">
 +
sectionX = long >> 42;
 +
sectionY = long << 44 >> 44;
 +
sectionZ = long << 22 >> 42;
 +
</syntaxhighlight>
 +
 
 +
Blocks are encoded:
 +
<syntaxhighlight lang="java">
 +
blockRawId << 12 | (blockLocalX << 8 | blockLocalY << 4 | blockLocalZ)
 +
//Uses the local position of the given block position relative to its respective chunk section
 +
</syntaxhighlight>
 +
 
 +
==== Select Advancement Tab ====
  
Velocity is believed to be in units of 1/8000 of a block per server tick (50ms); for example, -1343 would move (-1343 / 8000) = −0.167875 blocks per tick (or −3,3575 blocks per second).
+
Sent by the server to indicate that the client should switch advancement tab. Sent either when the client switches tab in the GUI or when an advancement in another tab is made.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,040: Line 4,268:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x45
+
  |rowspan="2"| 0x3C
  |rowspan="4"| Play
+
  |rowspan="2"| Play
  |rowspan="4"| Client
+
  |rowspan="2"| Client
  | Entity ID
+
  | Has id
  | VarInt
+
  | Boolean
  |  
+
  | Indicates if the next field is present
 
  |-
 
  |-
  | Velocity X
+
  | Optional Identifier
  | Short
+
  | String (32767)
  | Velocity on the X axis
+
  | See below
 +
|}
 +
 
 +
The Identifier can be one of the following:
 +
 
 +
{| class="wikitable"
 +
! Optional Identifier
 
  |-
 
  |-
  | Velocity Y
+
  | minecraft:story/root
| Short
 
| Velocity on the Y axis
 
 
  |-
 
  |-
  | Velocity Z
+
  | minecraft:nether/root
| Short
 
| Velocity on the Z axis
 
|}
 
 
 
==== Entity Equipment ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x46
+
  | minecraft:end/root
|rowspan="3"| Play
 
|rowspan="3"| Client
 
| Entity ID
 
| VarInt
 
| Entity's EID
 
 
  |-
 
  |-
  | Slot
+
  | minecraft:adventure/root
| VarInt Enum
 
| Equipment slot. 0: main hand, 1: off hand, 2–5: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet)
 
 
  |-
 
  |-
  | Item
+
  | minecraft:husbandry/root
| [[Slot Data|Slot]]
 
|
 
 
  |}
 
  |}
  
==== Set Experience ====
+
If no or an invalid identifier is sent, the client will switch to the first tab in the GUI.
  
Sent by the server when the client should change experience levels.
+
==== World Border ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,094: Line 4,304:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x47
+
  |rowspan="18"| 0x3D
  |rowspan="3"| Play
+
  |rowspan="18"| Play
  |rowspan="3"| Client
+
  |rowspan="18"| Client
  | Experience bar
+
  |colspan="2"| Action
  | Float
+
  | VarInt Enum
  | Between 0 and 1
+
  | Determines the format of the rest of the packet
 
  |-
 
  |-
  | Level
+
! Action
  | VarInt
+
! Field Name
 +
!
 +
!
 +
|-
 +
| 0: set size
 +
| Diameter
 +
| Double
 +
| Length of a single side of the world border, in meters
 +
|-
 +
|rowspan="3"| 1: lerp size
 +
| Old Diameter
 +
| Double
 +
| Current length of a single side of the world border, in meters
 +
|-
 +
| New Diameter
 +
| Double
 +
| Target length of a single side of the world border, in meters
 +
|-
 +
| Speed
 +
| VarLong
 +
| Number of real-time ''milli''seconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.
 +
|-
 +
|rowspan="2"| 2: set center
 +
  | X
 +
  | Double
 
  |  
 
  |  
 
  |-
 
  |-
  | Total Experience
+
  | Z
  | VarInt
+
  | Double
  | See {{Minecraft Wiki|Experience#Leveling up}} on the Minecraft Wiki for Total Experience to Level conversion
+
  |  
|}
 
 
 
==== Update Health ====
 
 
 
Sent by the server to update/set the health of the player it is sent to.
 
 
 
Food {{Minecraft Wiki|Food#Hunger vs. Saturation|saturation}} acts as a food “overcharge”. Food values will not decrease while the saturation is over zero. Players logging in automatically get a saturation of 5.0. Eating food increases the saturation as well as the food bar.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x48
+
  |rowspan="8"| 3: initialize
|rowspan="3"| Play
+
  | X
|rowspan="3"| Client
+
  | Double
  | Health
+
  |  
  | Float
 
  | 0 or less = dead, 20 = full HP
 
 
  |-
 
  |-
  | Food
+
  | Z
 +
| Double
 +
|
 +
|-
 +
| Old Diameter
 +
| Double
 +
| Current length of a single side of the world border, in meters
 +
|-
 +
| New Diameter
 +
| Double
 +
| Target length of a single side of the world border, in meters
 +
|-
 +
| Speed
 +
| VarLong
 +
| Number of real-time ''milli''seconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.
 +
|-
 +
| Portal Teleport Boundary
 +
| VarInt
 +
| Resulting coordinates from a portal teleport are limited to ±value. Usually 29999984.
 +
|-
 +
| Warning Time
 +
| VarInt
 +
| In seconds as set by <code>/worldborder warning time</code>
 +
|-
 +
| Warning Blocks
 +
| VarInt
 +
| In meters
 +
|-
 +
| 4: set warning time
 +
| Warning Time
 +
| VarInt
 +
| In seconds as set by <code>/worldborder warning time</code>
 +
|-
 +
| 5: set warning blocks
 +
| Warning Blocks
 
  | VarInt
 
  | VarInt
  | 0–20
+
  | In meters
|-
 
| Food Saturation
 
| Float
 
| Seems to vary from 0.0 to 5.0 in integer increments
 
 
  |}
 
  |}
  
==== Scoreboard Objective ====
+
The Notchian client determines how solid to display the warning by comparing to whichever is higher, the warning distance or whichever is lower, the distance from the current diameter to the target diameter or the place the border will be after warningTime seconds. In pseudocode:
 +
 
 +
<syntaxhighlight lang="java">
 +
distance = max(min(resizeSpeed * 1000 * warningTime, abs(targetDiameter - currentDiameter)), warningDistance);
 +
if (playerDistance < distance) {
 +
    warning = 1.0 - playerDistance / distance;
 +
} else {
 +
    warning = 0.0;
 +
}
 +
</syntaxhighlight>
  
This is sent to the client when it should create a new {{Minecraft Wiki|scoreboard}} objective or remove one.
+
==== Camera ====
  
{| class="wikitable"
+
Sets the entity that the player renders from. This is normally used when the player left-clicks an entity while in spectator mode.
 +
 
 +
The player's camera will move with the entity and look where it is looking. The entity is often another player, but can be any type of entity.  The player is unable to move this entity (move packets will act as if they are coming from the other entity).
 +
 
 +
If the given entity is not loaded by the player, this packet is ignored.  To return control to the player, send this packet with their entity ID.
 +
 
 +
The Notchian server resets this (sends it back to the default entity) whenever the spectated entity is killed or the player sneaks, but only if they were spectating an entity. It also sends this packet whenever the player switches out of spectator mode (even if they weren't spectating an entity).
 +
 
 +
{| class="wikitable"
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 4,156: Line 4,420:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x49
+
  | 0x3E
  |rowspan="4"| Play
+
  | Play
  |rowspan="4"| Client
+
  | Client
  | Objective Name
+
  | Camera ID
  | String (16)
+
  | VarInt
  | An unique name for the objective
+
  | ID of the entity to set the client's camera to
|-
 
| Mode
 
| Byte
 
| 0 to create the scoreboard. 1 to remove the scoreboard. 2 to update the display text.
 
|-
 
| Objective Value
 
| Optional Chat
 
| Only if mode is 0 or 2. The text to be displayed for the score
 
|-
 
| Type
 
| Optional VarInt enum
 
| Only if mode is 0 or 2. 0 = "integer", 1 = "hearts".
 
 
  |}
 
  |}
  
==== Set Passengers ====
+
The notchian also loads certain shaders for given entities:
 +
 
 +
* Creeper &rarr; <code>shaders/post/creeper.json</code>
 +
* Spider (and cave spider) &rarr; <code>shaders/post/spider.json</code>
 +
* Enderman &rarr; <code>shaders/post/invert.json</code>
 +
* Anything else &rarr; the current shader is unloaded
 +
 
 +
==== Held Item Change (clientbound) ====
 +
 
 +
Sent to change the player's slot selection.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,186: Line 4,447:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x4A
+
  | 0x3F
  |rowspan="3"| Play
+
| Play
  |rowspan="3"| Client
+
| Client
  | Entity ID
+
| Slot
| VarInt
+
| Byte
  | Vehicle's EID
+
| The slot which the player has selected (0–8)
|-
+
|}
  | Passenger Count
+
 
 +
==== Update View Position ====
 +
 
 +
{{Need Info|Why is this even needed?  Is there a better name for it?  My guess is that it's something to do with logical behavior with latency, but it still seems weird.}}
 +
 
 +
Updates the client's location. This is used to determine what chunks should remain loaded and if a chunk load should be ignored; chunks outside of the view distance may be unloaded.
 +
 
 +
Sent whenever the player moves across a chunk border horizontally, and also (according to testing) for any integer change in the vertical axis, even if it doesn't go across a chunk section border.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
  |rowspan="2"| 0x40
 +
  |rowspan="2"| Play
 +
  |rowspan="2"| Client
 +
  | Chunk X
 
  | VarInt
 
  | VarInt
  | Number of elements in the following array
+
  | Chunk X coordinate of the player's position
 
  |-
 
  |-
  | Passengers
+
  | Chunk Z
  | Array of VarInt
+
  | VarInt
  | EIDs of entity's passengers
+
  | Chunk Z coordinate of the player's position
 
  |}
 
  |}
  
==== Teams ====
+
==== Update View Distance ====
  
Creates and updates teams.
+
Sent by the integrated singleplayer server when changing render distance.  Does not appear to be used by the dedicated server, as <code>view-distance</code> in server.properties cannot be changed at runtime.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,210: Line 4,491:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="23"| 0x4B
+
  | 0x41
  |rowspan="23"| Play
+
  | Play
  |rowspan="23"| Client
+
  | Client
  |colspan="2"| Team Name
+
  | View Distance
  | String (16)
+
| VarInt
  | A unique name for the team. (Shared with scoreboard).
+
  | Render distance (2-32)  
|-
+
  |}
|colspan="2"| Mode
+
  | Byte
+
==== Spawn Position ====
  | Determines the layout of the remaining packet
+
 
 +
Sent by the server after login to specify the coordinates of the spawn point (the point at which players spawn at, and which the compass points to). It can be sent at any time to update the point compasses point at.
 +
 
 +
{| class="wikitable"
 +
  ! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
  ! Notes
 
  |-
 
  |-
  |rowspan="9"| 0: create team
+
  | 0x42
  | Team Display Name
+
| Play
  | Chat
+
| Client
  |
+
| Location
 +
| Position
 +
| Spawn location
 +
|}
 +
 
 +
==== Display Scoreboard ====
 +
 
 +
This is sent to the client when it should display a scoreboard.
 +
 
 +
{| class="wikitable"
 +
  ! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
  ! Field Type
 +
  ! Notes
 
  |-
 
  |-
  | Friendly Flags
+
  |rowspan="2"| 0x43
 +
|rowspan="2"| Play
 +
|rowspan="2"| Client
 +
| Position
 
  | Byte
 
  | Byte
  | Bit mask. 0x01: Allow friendly fire, 0x02: can see invisible players on same team
+
  | The position of the scoreboard. 0: list, 1: sidebar, 2: below name, 3 - 18: team specific sidebar, indexed as 3 + team color.
 
  |-
 
  |-
  | Name Tag Visibility
+
  | Score Name
  | String Enum (32)
+
  | String (16)
  | <code>always</code>, <code>hideForOtherTeams</code>, <code>hideForOwnTeam</code>, <code>never</code>
+
  | The unique name for the scoreboard to be displayed.
  |-
+
  |}
| Collision Rule
+
 
  | String Enum (32)
+
==== Entity Metadata ====
  | <code>always</code>, <code>pushOtherTeams</code>, <code>pushOwnTeam</code>, <code>never</code>
+
 
  |-
+
Updates one or more [[Entities#Entity Metadata Format|metadata]] properties for an existing entity. Any properties not included in the Metadata field are left unchanged.
  | Team Color
+
 
  | VarInt enum
+
{| class="wikitable"
  | Used to color the name of players on the team; see below
+
  ! Packet ID
 +
  ! State
 +
  ! Bound To
 +
  ! Field Name
 +
  ! Field Type
 +
  ! Notes
 
  |-
 
  |-
  | Team Prefix
+
  |rowspan="2"| 0x44
| Chat
+
  |rowspan="2"| Play
| Displayed before the names of players that are part of this team
+
  |rowspan="2"| Client
|-
+
  | Entity ID
  | Team Suffix
 
| Chat
 
  | Displayed after the names of players that are part of this team
 
|-
 
  | Entity Count
 
 
  | VarInt
 
  | VarInt
| Number of elements in the following array
 
|-
 
| Entities
 
| Array of String (40)
 
| Identifiers for the entities in this team.  For players, this is their username; for other entities, it is their UUID.
 
|-
 
| 1: remove team
 
| ''no fields''
 
| ''no fields''
 
 
  |  
 
  |  
 
  |-
 
  |-
  |rowspan="7"| 2: update team info
+
  | Metadata
  | Team Display Name
+
  | [[Entities#Entity Metadata Format|Entity Metadata]]
| Chat
 
 
  |  
 
  |  
 +
|}
 +
 +
==== Attach Entity ====
 +
 +
This packet is sent when an entity has been {{Minecraft Wiki|Lead|leashed}} to another entity.
 +
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | Friendly Flags
+
  |rowspan="2"| 0x45
  | Byte
+
|rowspan="2"| Play
  | Bit mask. 0x01: Allow friendly fire, 0x02: can see invisible entities on same team
+
|rowspan="2"| Client
 +
| Attached Entity ID
 +
  | Int
 +
  | Attached entity's EID
 
  |-
 
  |-
  | Name Tag Visibility
+
  | Holding Entity ID
  | String Enum (32)
+
| Int
  | <code>always</code>, <code>hideForOtherTeams</code>, <code>hideForOwnTeam</code>, <code>never</code>
+
  | ID of the entity holding the lead. Set to -1 to detach.
 +
  |}
 +
 
 +
==== Entity Velocity ====
 +
 
 +
Velocity is believed to be in units of 1/8000 of a block per server tick (50ms); for example, -1343 would move (-1343 / 8000) = −0.167875 blocks per tick (or −3,3575 blocks per second).
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | Collision Rule
+
  |rowspan="4"| 0x46
  | String Enum (32)
+
|rowspan="4"| Play
  | <code>always</code>, <code>pushOtherTeams</code>, <code>pushOwnTeam</code>, <code>never</code>
+
|rowspan="4"| Client
 +
| Entity ID
 +
  | VarInt
 +
  |  
 
  |-
 
  |-
  | Team Color
+
  | Velocity X
  | VarInt enum
+
  | Short
  | Used to color the name of players on the team; see below
+
  | Velocity on the X axis
 
  |-
 
  |-
  | Team Prefix
+
  | Velocity Y
  | Chat
+
  | Short
  | Displayed before the names of players that are part of this team
+
  | Velocity on the Y axis
 
  |-
 
  |-
  | Team Suffix
+
  | Velocity Z
  | Chat
+
  | Short
  | Displayed after the names of players that are part of this team
+
  | Velocity on the Z axis
|-
 
|rowspan="2"| 3: add players to team
 
| Entity Count
 
| VarInt
 
| Number of elements in the following array
 
|-
 
| Entities
 
| Array of String (40)
 
| Identifiers for the entities added.  For players, this is their username; for other entities, it is their UUID.
 
|-
 
|rowspan="2"| 4: remove players from team
 
| Entity Count
 
| VarInt
 
| Number of elements in the following array
 
|-
 
| Entities
 
| Array of String (40)
 
| Identifiers for the entities removed.  For players, this is their username; for other entities, it is their UUID.
 
 
  |}
 
  |}
  
Team Color: The color of a team defines how the names of the team members are visualized; any formatting code can be used. The following table lists all the possible values.
+
==== Entity Equipment ====
 
 
{| class="wikitable"
 
! ID
 
! Formatting
 
|-
 
| 0-15
 
| Color formatting, same values as [[Chat]] colors.
 
|-
 
| 16
 
| Obfuscated
 
|-
 
| 17
 
| Bold
 
|-
 
| 18
 
| Strikethrough
 
|-
 
| 19
 
| Underlined
 
|-
 
| 20
 
| Italic
 
|-
 
| 21
 
| Reset
 
|}
 
 
 
==== Update Score ====
 
 
 
This is sent to the client when it should update a scoreboard item.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,351: Line 4,633:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x4C
+
  |rowspan="3"| 0x47
  |rowspan="4"| Play
+
  |rowspan="3"| Play
  |rowspan="4"| Client
+
  |rowspan="3"| Client
  | Entity Name
+
  |colspan="2"| Entity ID
  | String (40)
+
  |colspan="2"| VarInt
  | The entity whose score this is.  For players, this is their username; for other entities, it is their UUID.
+
  | Entity's EID
 
  |-
 
  |-
  | Action
+
  |rowspan="2"| Equipment
  | Byte
+
| Slot
  | 0 to create/update an item. 1 to remove an item.
+
|rowspan="2"| Array
 +
  | Byte Enum
 +
  | Equipment slot. 0: main hand, 1: off hand, 2–5: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet). Also has the top bit set if another entry follows, and otherwise unset if this is the last item in the array.
 
  |-
 
  |-
  | Objective Name
+
  | Item
  | String (16)
+
  | [[Slot Data|Slot]]
| The name of the objective the score belongs to
+
  |
|-
 
| Value
 
| Optional VarInt
 
  | The score to be displayed next to the entry. Only sent when Action does not equal 1.
 
 
  |}
 
  |}
  
==== Spawn Position ====
+
==== Set Experience ====
  
Sent by the server after login to specify the coordinates of the spawn point (the point at which players spawn at, and which the compass points to). It can be sent at any time to update the point compasses point at.
+
Sent by the server when the client should change experience levels.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,387: Line 4,667:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x4D
+
  |rowspan="3"| 0x48
  |rowspan="1"| Play
+
  |rowspan="3"| Play
  |rowspan="1"| Client
+
  |rowspan="3"| Client
  | Location
+
  | Experience bar
  | Position
+
| Float
  | Spawn location
+
  | Between 0 and 1
 +
  |-
 +
| Level
 +
| VarInt
 +
|
 +
|-
 +
| Total Experience
 +
| VarInt
 +
| See {{Minecraft Wiki|Experience#Leveling up}} on the Minecraft Wiki for Total Experience to Level conversion
 
  |}
 
  |}
  
==== Time Update ====
+
==== Update Health ====
  
Time is based on ticks, where 20 ticks happen every second. There are 24000 ticks in a day, making Minecraft days exactly 20 minutes long.
+
Sent by the server to update/set the health of the player it is sent to.
  
The time of day is based on the timestamp modulo 24000. 0 is sunrise, 6000 is noon, 12000 is sunset, and 18000 is midnight.
+
Food {{Minecraft Wiki|Food#Hunger vs. Saturation|saturation}} acts as a food “overcharge”. Food values will not decrease while the saturation is over zero. Players logging in automatically get a saturation of 5.0. Eating food increases the saturation as well as the food bar.
 
 
The default SMP server increments the time by <code>20</code> every second.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,411: Line 4,697:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x4E
+
  |rowspan="3"| 0x49
  |rowspan="2"| Play
+
  |rowspan="3"| Play
  |rowspan="2"| Client
+
  |rowspan="3"| Client
  | World Age
+
  | Health
  | Long
+
  | Float
  | In ticks; not changed by server commands
+
  | 0 or less = dead, 20 = full HP
 
  |-
 
  |-
  | Time of day
+
  | Food
  | Long
+
  | VarInt
  | The world (or region) time, in ticks. If negative the sun will stop moving at the Math.abs of the time
+
  | 0–20
 +
|-
 +
| Food Saturation
 +
| Float
 +
| Seems to vary from 0.0 to 5.0 in integer increments
 
  |}
 
  |}
  
==== Title ====
+
==== Scoreboard Objective ====
 +
 
 +
This is sent to the client when it should create a new {{Minecraft Wiki|scoreboard}} objective or remove one.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,429: Line 4,721:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="10"| 0x4F
+
  |rowspan="4"| 0x4A
  |rowspan="10"| Play
+
  |rowspan="4"| Play
  |rowspan="10"| Client
+
  |rowspan="4"| Client
  |colspan="2"| Action
+
  | Objective Name
  | VarInt Enum
+
  | String (16)
  |  
+
  | An unique name for the objective
 
  |-
 
  |-
  ! Action
+
  | Mode
  ! Field Name
+
  | Byte
  !
+
  | 0 to create the scoreboard. 1 to remove the scoreboard. 2 to update the display text.
!
 
 
  |-
 
  |-
  | 0: set title
+
  | Objective Value
  | Title Text
+
  | Optional Chat
| [[Chat]]
+
  | Only if mode is 0 or 2. The text to be displayed for the score
  |  
 
 
  |-
 
  |-
  | 1: set subtitle
+
  | Type
| Subtitle Text
+
  | Optional VarInt enum
  | [[Chat]]
+
  | Only if mode is 0 or 2. 0 = "integer", 1 = "hearts".
|
 
|-
 
  | 2: set action bar
 
| Action bar text
 
| [[Chat]]
 
| Displays a message above the hotbar (the same as position 2 in [[#Chat Message (clientbound)|Chat Message (clientbound)]], except that it correctly renders formatted chat. See [https://bugs.mojang.com/browse/MC-119145 MC-119145] for more information.)
 
|-
 
|rowspan="3"| 3: set times and display
 
| Fade In
 
| Int
 
| Ticks to spend fading in
 
|-
 
| Stay
 
| Int
 
| Ticks to keep the title displayed
 
|-
 
| Fade Out
 
| Int
 
| Ticks to spend out, not when to start fading out
 
|-
 
| 4: hide
 
| ''no fields''
 
| ''no fields''
 
|
 
|-
 
| 5: reset
 
| ''no fields''
 
| ''no fields''
 
|
 
 
  |}
 
  |}
  
“Hide” makes the title disappear, but if you run times again the same title will appear. “Reset” erases the text.
+
==== Set Passengers ====
 
 
The title is visible on screen for Fade In + Stay + Fade Out ticks.
 
 
 
==== Entity Sound Effect ====
 
 
 
Plays a sound effect from an entity.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,500: Line 4,755:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x50
+
  |rowspan="3"| 0x4B
  |rowspan="5"| Play
+
  |rowspan="3"| Play
  |rowspan="5"| Client
+
  |rowspan="3"| Client
  | Sound ID
+
  | Entity ID
 
  | VarInt
 
  | VarInt
  | ID of hardcoded sound event ([https://pokechu22.github.io/Burger/1.14.4.html#sounds events] as of 1.14.4)
+
  | Vehicle's EID
 
  |-
 
  |-
  | Sound Category
+
  | Passenger Count
| VarInt Enum
 
| The category that this sound will be played from ([https://gist.github.com/konwboj/7c0c380d3923443e9d55 current categories])
 
|-
 
| Entity ID
 
 
  | VarInt
 
  | VarInt
  |
+
  | Number of elements in the following array
 
  |-
 
  |-
  | Volume
+
  | Passengers
  | Float
+
  | Array of VarInt
  | 1.0 is 100%, capped between 0.0 and 1.0 by Notchian clients
+
  | EIDs of entity's passengers
|-
 
| Pitch
 
| Float
 
| Float between 0.5 and 2.0 by Notchian clients
 
 
  |}
 
  |}
  
==== Sound Effect ====
+
==== Teams ====
  
This packet is used to play a number of hardcoded sound events. For custom sounds, use [[#Named Sound Effect|Named Sound Effect]].
+
Creates and updates teams.
 
 
{{Warning|Numeric sound effect IDs are liable to change between versions}}
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,534: Line 4,779:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="7"| 0x51
+
  |rowspan="23"| 0x4C
  |rowspan="7"| Play
+
  |rowspan="23"| Play
  |rowspan="7"| Client
+
  |rowspan="23"| Client
  | Sound ID
+
  |colspan="2"| Team Name
  | VarInt
+
  | String (16)
  | ID of hardcoded sound event ([https://pokechu22.github.io/Burger/1.14.4.html#sounds events] as of 1.14.4)
+
  | A unique name for the team. (Shared with scoreboard).
 
  |-
 
  |-
  | Sound Category
+
  |colspan="2"| Mode
  | VarInt Enum
+
  | Byte
  | The category that this sound will be played from ([https://gist.github.com/konwboj/7c0c380d3923443e9d55 current categories])
+
  | Determines the layout of the remaining packet
 
  |-
 
  |-
  | Effect Position X
+
  |rowspan="9"| 0: create team
  | Int
+
  | Team Display Name
  | Effect X multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
+
  | Chat
 +
|  
 
  |-
 
  |-
  | Effect Position Y
+
  | Friendly Flags
  | Int
+
  | Byte
  | Effect Y multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
+
  | Bit mask. 0x01: Allow friendly fire, 0x02: can see invisible players on same team
 
  |-
 
  |-
  | Effect Position Z
+
  | Name Tag Visibility
  | Int
+
  | String Enum (32)
  | Effect Z multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
+
  | <code>always</code>, <code>hideForOtherTeams</code>, <code>hideForOwnTeam</code>, <code>never</code>
 
  |-
 
  |-
  | Volume
+
  | Collision Rule
  | Float
+
  | String Enum (32)
  | 1.0 is 100%, capped between 0.0 and 1.0 by Notchian clients
+
  | <code>always</code>, <code>pushOtherTeams</code>, <code>pushOwnTeam</code>, <code>never</code>
 
  |-
 
  |-
  | Pitch
+
  | Team Color
  | Float
+
  | VarInt enum
  | Float between 0.5 and 2.0 by Notchian clients
+
  | Used to color the name of players on the team; see below
|}
 
 
 
==== Stop Sound ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x52
+
  | Team Prefix
|rowspan="3"| Play
+
  | Chat
|rowspan="3"| Client
+
  | Displayed before the names of players that are part of this team
| Flags
 
  | Byte
 
  | Controls which fields are present.
 
 
  |-
 
  |-
  | Source
+
  | Team Suffix
  | Optional VarInt enum
+
  | Chat
  | Only if flags is 3 or 1 (bit mask 0x1).  See below.  If not present, then sounds from all sources are cleared.
+
  | Displayed after the names of players that are part of this team
 
  |-
 
  |-
  | Sound
+
  | Entity Count
  | Optional Identifier
+
  | VarInt
  | Only if flags is 2 or 3 (bit mask 0x2).  A sound effect name, see [[#Named Sound Effect|Named Sound Effect]].  If not present, then all sounds are cleared.
+
  | Number of elements in the following array
|}
 
 
 
Categories:
 
 
 
{| class="wikitable"
 
! Name !! Value
 
 
  |-
 
  |-
  | master || 0
+
  | Entities
 +
| Array of String (40)
 +
| Identifiers for the entities in this team.  For players, this is their username; for other entities, it is their UUID.
 
  |-
 
  |-
  | music || 1
+
  | 1: remove team
 +
| ''no fields''
 +
| ''no fields''
 +
|
 +
|-
 +
|rowspan="7"| 2: update team info
 +
| Team Display Name
 +
| Chat
 +
|
 +
|-
 +
| Friendly Flags
 +
| Byte
 +
| Bit mask. 0x01: Allow friendly fire, 0x02: can see invisible entities on same team
 +
|-
 +
| Name Tag Visibility
 +
| String Enum (32)
 +
| <code>always</code>, <code>hideForOtherTeams</code>, <code>hideForOwnTeam</code>, <code>never</code>
 
  |-
 
  |-
  | record || 2
+
  | Collision Rule
 +
| String Enum (32)
 +
| <code>always</code>, <code>pushOtherTeams</code>, <code>pushOwnTeam</code>, <code>never</code>
 
  |-
 
  |-
  | weather || 3
+
  | Team Color
 +
| VarInt enum
 +
| Used to color the name of players on the team; see below
 
  |-
 
  |-
  | block || 4
+
  | Team Prefix
 +
| Chat
 +
| Displayed before the names of players that are part of this team
 
  |-
 
  |-
  | hostile || 5
+
  | Team Suffix
 +
| Chat
 +
| Displayed after the names of players that are part of this team
 
  |-
 
  |-
  | neutral || 6
+
  |rowspan="2"| 3: add players to team
 +
| Entity Count
 +
| VarInt
 +
| Number of elements in the following array
 
  |-
 
  |-
  | player || 7
+
  | Entities
 +
| Array of String (40)
 +
| Identifiers for the entities added.  For players, this is their username; for other entities, it is their UUID.
 
  |-
 
  |-
  | ambient || 8
+
  |rowspan="2"| 4: remove players from team
 +
| Entity Count
 +
| VarInt
 +
| Number of elements in the following array
 
  |-
 
  |-
  | voice || 9
+
  | Entities
 +
| Array of String (40)
 +
| Identifiers for the entities removed.  For players, this is their username; for other entities, it is their UUID.
 
  |}
 
  |}
  
==== Player List Header And Footer ====
+
Team Color: The color of a team defines how the names of the team members are visualized; any formatting code can be used. The following table lists all the possible values.
  
This packet may be used by custom servers to display additional information above/below the player list. It is never sent by the Notchian server.
+
{| class="wikitable"
 
+
  ! ID
{| class="wikitable"
+
  ! Formatting
  ! Packet ID
+
|-
  ! State
+
| 0-15
  ! Bound To
+
| Color formatting, same values as [[Chat]] colors.
  ! Field Name
+
|-
  ! Field Type
+
| 16
  ! Notes
+
| Obfuscated
 +
|-
 +
| 17
 +
| Bold
 +
  |-
 +
| 18
 +
| Strikethrough
 +
  |-
 +
  | 19
 +
  | Underlined
 
  |-
 
  |-
  |rowspan="2"| 0x53
+
  | 20
|rowspan="2"| Play
+
  | Italic
|rowspan="2"| Client
 
| Header
 
| [[Chat]]
 
  | To remove the header, send a empty translatable component: {"translate":""}
 
 
  |-
 
  |-
  | Footer
+
  | 21
  | [[Chat]]
+
  | Reset
| To remove the footer, send a empty translatable component: {"translate":""}
 
 
  |}
 
  |}
  
==== NBT Query Response ====
+
==== Update Score ====
  
Sent in response to [[#Query Block NBT|Query Block NBT]] or [[#Query Entity NBT|Query Entity NBT]].
+
This is sent to the client when it should update a scoreboard item.  
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,658: Line 4,924:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x54
+
  |rowspan="4"| 0x4D
  |rowspan="2"| Play
+
  |rowspan="4"| Play
  |rowspan="2"| Client
+
  |rowspan="4"| Client
  | Transaction ID
+
  | Entity Name
  | VarInt
+
  | String (40)
  | Can be compared to the one sent in the original query packet.
+
  | The entity whose score this is.  For players, this is their username; for other entities, it is their UUID.
 
  |-
 
  |-
  | NBT
+
  | Action
  | [[NBT|NBT Tag]]
+
  | Byte
  | The NBT of the block or entity. May be a TAG_END (0) in which case no NBT is present.
+
| 0 to create/update an item. 1 to remove an item.
 +
|-
 +
| Objective Name
 +
| String (16)
 +
  | The name of the objective the score belongs to
 +
|-
 +
| Value
 +
| Optional VarInt
 +
  | The score to be displayed next to the entry. Only sent when Action does not equal 1.
 
  |}
 
  |}
  
==== Collect Item ====
+
==== Time Update ====
 +
 
 +
Time is based on ticks, where 20 ticks happen every second. There are 24000 ticks in a day, making Minecraft days exactly 20 minutes long.
 +
 
 +
The time of day is based on the timestamp modulo 24000. 0 is sunrise, 6000 is noon, 12000 is sunset, and 18000 is midnight.
  
Sent by the server when someone picks up an item lying on the ground — its sole purpose appears to be the animation of the item flying towards you. It doesn't destroy the entity in the client memory, and it doesn't add it to your inventory. The server only checks for items to be picked up after each [[#Player Position|Player Position]] (and [[#Player Position And Look|Player Position And Look]]) packet sent by the client. The collector entity can be any entity; it does not have to be a player. The collected entity also can be any entity, but the Notchian server only uses this for items, experience orbs, and the different varieties of arrows.
+
The default SMP server increments the time by <code>20</code> every second.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,682: Line 4,960:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x55
+
  |rowspan="2"| 0x4E
  |rowspan="3"| Play
+
  |rowspan="2"| Play
  |rowspan="3"| Client
+
  |rowspan="2"| Client
  | Collected Entity ID
+
  | World Age
  | VarInt
+
  | Long
  |  
+
  | In ticks; not changed by server commands
  |-  
+
  |-
  | Collector Entity ID
+
  | Time of day
| VarInt
+
  | Long
|
+
  | The world (or region) time, in ticks. If negative the sun will stop moving at the Math.abs of the time
|-
 
  | Pickup Item Count
 
  | VarInt
 
| Seems to be 1 for XP orbs, otherwise the number of items in the stack.
 
 
  |}
 
  |}
  
==== Entity Teleport ====
+
==== Title ====
 
 
This packet is sent by the server when an entity moves more than 8 blocks.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,706: Line 4,978:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="7"| 0x56
+
  |rowspan="10"| 0x4F
  |rowspan="7"| Play
+
  |rowspan="10"| Play
  |rowspan="7"| Client
+
  |rowspan="10"| Client
  | Entity ID
+
  |colspan="2"| Action
  | VarInt
+
  | VarInt Enum
 
  |  
 
  |  
 
  |-
 
  |-
  | X
+
! Action
  | Double
+
! Field Name
 +
!
 +
!
 +
|-
 +
| 0: set title
 +
  | Title Text
 +
  | [[Chat]]
 
  |  
 
  |  
 
  |-
 
  |-
  | Y
+
  | 1: set subtitle
  | Double
+
  | Subtitle Text
 +
| [[Chat]]
 
  |  
 
  |  
 +
|-
 +
| 2: set action bar
 +
| Action bar text
 +
| [[Chat]]
 +
| Displays a message above the hotbar (the same as position 2 in [[#Chat Message (clientbound)|Chat Message (clientbound)]], except that it correctly renders formatted chat. See [https://bugs.mojang.com/browse/MC-119145 MC-119145] for more information.)
 
  |-
 
  |-
  | Z
+
  |rowspan="3"| 3: set times and display
  | Double
+
| Fade In
  |  
+
  | Int
 +
  | Ticks to spend fading in
 
  |-
 
  |-
  | Yaw
+
  | Stay
  | Angle
+
  | Int
  | New angle, not a delta
+
  | Ticks to keep the title displayed
 
  |-
 
  |-
  | Pitch
+
  | Fade Out
  | Angle
+
  | Int
  | New angle, not a delta
+
  | Ticks to spend out, not when to start fading out
 
  |-
 
  |-
  | On Ground
+
  | 4: hide
  | Boolean
+
  | ''no fields''
 +
| ''no fields''
 
  |  
 
  |  
  |}
+
|-
 
+
| 5: reset
==== Advancements ====
+
| ''no fields''
 +
| ''no fields''
 +
|
 +
  |}
 +
 
 +
“Hide” makes the title disappear, but if you run times again the same title will appear. “Reset” erases the text.
 +
 
 +
The title is visible on screen for Fade In + Stay + Fade Out ticks.
 +
 
 +
==== Entity Sound Effect ====
 +
 
 +
Plays a sound effect from an entity.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,748: Line 5,045:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="9"| 0x57
+
  |rowspan="5"| 0x50
  |rowspan="9"| Play
+
  |rowspan="5"| Play
  |rowspan="9"| Client
+
  |rowspan="5"| Client
  |colspan="2"| Reset/Clear
+
  | Sound ID
  |colspan="2"| Boolean
+
  | VarInt
  | Whether to reset/clear the current advancements
+
  | ID of hardcoded sound event ([https://pokechu22.github.io/Burger/1.16.3.html#sounds events] as of 1.16.3)
 
  |-
 
  |-
  |colspan="2"| Mapping size
+
  | Sound Category
  |colspan="2"| VarInt
+
  | VarInt Enum
  | Size of the following array
+
  | The category that this sound will be played from ([https://gist.github.com/konwboj/7c0c380d3923443e9d55 current categories])
 
  |-
 
  |-
  |rowspan="2"| Advancement mapping
+
  | Entity ID
| Key
+
  | VarInt
|rowspan="2"| Array
+
  |
  | Identifier
 
  | The identifier of the advancement
 
 
  |-
 
  |-
  | Value
+
  | Volume
  | Advancement
+
  | Float
  | See below
+
  | 1.0 is 100%, capped between 0.0 and 1.0 by Notchian clients
 
  |-
 
  |-
  |colspan="2"| List size
+
  | Pitch
|colspan="2"| VarInt
+
  | Float
| Size of the following array
+
  | Float between 0.5 and 2.0 by Notchian clients
  |-
 
  |colspan="2"| Identifiers
 
|colspan="2"| Array of Identifier
 
| The identifiers of the advancements that should be removed
 
|-
 
|colspan="2"| Progress size
 
|colspan="2"| VarInt
 
| Size of the following array
 
|-
 
|rowspan="2"| Progress mapping
 
| Key
 
|rowspan="2"| Array
 
| Identifier
 
| The identifier of the advancement
 
|-
 
| Value
 
| Advancement progress
 
| See below
 
 
  |}
 
  |}
  
Advancement structure:
+
==== Sound Effect ====
 +
 
 +
This packet is used to play a number of hardcoded sound events. For custom sounds, use [[#Named Sound Effect|Named Sound Effect]].
 +
 
 +
{{Warning|Numeric sound effect IDs are liable to change between versions}}
  
 
{| class="wikitable"
 
{| class="wikitable"
  !colspan="2"| Field Name
+
  ! Packet ID
  !colspan="2"| Field Type
+
! State
 +
! Bound To
 +
! Field Name
 +
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |colspan="2"| Has parent
+
  |rowspan="7"| 0x51
  |colspan="2"| Boolean
+
  |rowspan="7"| Play
  | Indicates whether the next field exists.
+
  |rowspan="7"| Client
 +
| Sound ID
 +
| VarInt
 +
| ID of hardcoded sound event ([https://pokechu22.github.io/Burger/1.16.3.html#sounds events] as of 1.16.3)
 
  |-
 
  |-
  |colspan="2"| Parent id
+
  | Sound Category
  |colspan="2"| Optional Identifier
+
  | VarInt Enum
  | The identifier of the parent advancement.
+
  | The category that this sound will be played from ([https://gist.github.com/konwboj/7c0c380d3923443e9d55 current categories])
 
  |-
 
  |-
  |colspan="2"| Has display
+
  | Effect Position X
  |colspan="2"| Boolean
+
  | Int
  | Indicates whether the next field exists
+
  | Effect X multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
 
  |-
 
  |-
  |colspan="2"| Display data
+
  | Effect Position Y
  |colspan="2"| Optional advancement display
+
  | Int
  | See below.
+
  | Effect Y multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
 
  |-
 
  |-
  |colspan="2"| Number of criteria
+
  | Effect Position Z
  |colspan="2"| VarInt
+
  | Int
  | Size of the following array
+
  | Effect Z multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
 
  |-
 
  |-
  |rowspan="2"| Criteria
+
  | Volume
| Key
+
  | Float
|rowspan="2"| Array
+
  | 1.0 is 100%, capped between 0.0 and 1.0 by Notchian clients
  | Identifier
 
  | The identifier of the criterion
 
 
  |-
 
  |-
  | Value
+
  | Pitch
  | '''Void'''
+
  | Float
  | There is ''no'' content written here. Perhaps this will be expanded in the future?
+
  | Float between 0.5 and 2.0 by Notchian clients
|-
 
|colspan="2"| Array length
 
|colspan="2"| VarInt
 
| Number of arrays in the following array
 
|-
 
|rowspan="2"| Requirements
 
| Array length 2
 
|rowspan="2"| Array
 
| VarInt
 
| Number of elements in the following array
 
|-
 
| Requirement
 
| Array of String
 
| Array of required criteria
 
 
  |}
 
  |}
  
Advancement display:
+
==== Stop Sound ====
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 
  ! Field Name
 
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | Title
+
  |rowspan="3"| 0x52
  | Chat
+
|rowspan="3"| Play
  |
+
|rowspan="3"| Client
 +
| Flags
 +
  | Byte
 +
  | Controls which fields are present.
 
  |-
 
  |-
  | Description
+
  | Source
  | Chat
+
  | Optional VarInt enum
  |
+
  | Only if flags is 3 or 1 (bit mask 0x1).  See below.  If not present, then sounds from all sources are cleared.
 +
|-
 +
| Sound
 +
| Optional Identifier
 +
| Only if flags is 2 or 3 (bit mask 0x2).  A sound effect name, see [[#Named Sound Effect|Named Sound Effect]].  If not present, then all sounds are cleared.
 +
|}
 +
 
 +
Categories:
 +
 
 +
{| class="wikitable"
 +
! Name !! Value
 +
|-
 +
| master || 0
 +
|-
 +
| music || 1
 +
|-
 +
| record || 2
 +
|-
 +
| weather || 3
 
  |-
 
  |-
  | Icon
+
  | block || 4
| [[Slot]]
 
|
 
 
  |-
 
  |-
  | Frame type
+
  | hostile || 5
| VarInt enum
 
| 0 = <code>task</code>, 1 = <code>challenge</code>, 2 = <code>goal</code>
 
 
  |-
 
  |-
  | Flags
+
  | neutral || 6
| Integer
 
| 0x1: has background texture; 0x2: <code>show_toast</code>; 0x4: <code>hidden</code>
 
 
  |-
 
  |-
  | Background texture
+
  | player || 7
| Optional Identifier
 
| Background texture location.  Only if flags indicates it.
 
 
  |-
 
  |-
  | X coord
+
  | ambient || 8
| Float
 
|  
 
 
  |-
 
  |-
  | Y coord
+
  | voice || 9
| Float
 
|  
 
 
  |}
 
  |}
  
Advancement progress:
+
==== Player List Header And Footer ====
 +
 
 +
This packet may be used by custom servers to display additional information above/below the player list. It is never sent by the Notchian server.
  
 
{| class="wikitable"
 
{| class="wikitable"
  !colspan="2"| Field Name
+
  ! Packet ID
  !colspan="2"| Field Type
+
! State
 +
! Bound To
 +
! Field Name
 +
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |colspan="2"| Size
+
  |rowspan="2"| 0x53
  |colspan="2"| VarInt
+
  |rowspan="2"| Play
  | Size of the following array
+
  |rowspan="2"| Client
 +
| Header
 +
| [[Chat]]
 +
| To remove the header, send a empty text component: {"text":""}
 
  |-
 
  |-
  |rowspan="2"| Criteria
+
  | Footer
  | Criterion identifier
+
  | [[Chat]]
  |rowspan="2"| Array
+
  | To remove the footer, send a empty text component: {"text":""}
| Identifier
 
| The identifier of the criterion.
 
|-
 
| Criterion progress
 
| Criterion progress
 
|
 
 
  |}
 
  |}
  
Criterion progress:
+
==== NBT Query Response ====
 +
 
 +
Sent in response to [[#Query Block NBT|Query Block NBT]] or [[#Query Entity NBT|Query Entity NBT]].
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 
  ! Field Name
 
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | Achieved
+
  |rowspan="2"| 0x54
  | Boolean
+
|rowspan="2"| Play
  | If true, next field is present
+
|rowspan="2"| Client
 +
| Transaction ID
 +
  | VarInt
 +
  | Can be compared to the one sent in the original query packet.
 
  |-
 
  |-
  | Date of achieving
+
  | NBT
  | Optional Long
+
  | [[NBT|NBT Tag]]
  | As returned by [https://docs.oracle.com/javase/6/docs/api/java/util/Date.html#getTime() <code>Date.getTime</code>]
+
  | The NBT of the block or entity. May be a TAG_END (0) in which case no NBT is present.
 
  |}
 
  |}
  
==== Entity Properties ====
+
==== Collect Item ====
  
Sets {{Minecraft Wiki|Attribute|attributes}} on the given entity.
+
Sent by the server when someone picks up an item lying on the ground — its sole purpose appears to be the animation of the item flying towards you. It doesn't destroy the entity in the client memory, and it doesn't add it to your inventory. The server only checks for items to be picked up after each [[#Player Position|Player Position]] (and [[#Player Position And Look|Player Position And Look]]) packet sent by the client. The collector entity can be any entity; it does not have to be a player. The collected entity also can be any entity, but the Notchian server only uses this for items, experience orbs, and the different varieties of arrows.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 4,934: Line 5,227:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| 0x58
+
  |rowspan="3"| 0x55
  |rowspan="6"| Play
+
  |rowspan="3"| Play
  |rowspan="6"| Client
+
  |rowspan="3"| Client
  |colspan="2"| Entity ID
+
  | Collected Entity ID
  |colspan="2"| VarInt
+
| VarInt
 +
|
 +
|-
 +
| Collector Entity ID
 +
  | VarInt
 
  |  
 
  |  
  |-
+
  |-  
  |colspan="2"| Number Of Properties
+
  | Pickup Item Count
|colspan="2"| Int
 
| Number of elements in the following array
 
|-
 
|rowspan="4"| Property
 
| Key
 
|rowspan="4"| Array
 
| String (64)
 
| See below
 
|-
 
| Value
 
| Double
 
| See below
 
|-
 
| Number Of Modifiers
 
 
  | VarInt
 
  | VarInt
  | Number of elements in the following array
+
  | Seems to be 1 for XP orbs, otherwise the number of items in the stack.
|-
 
| Modifiers
 
| Array of Modifier Data
 
| See {{Minecraft Wiki|Attribute#Modifiers}}. Modifier Data defined below.
 
 
  |}
 
  |}
  
Known Key values (see also {{Minecraft Wiki|Attribute#Modifiers}}):
+
==== Entity Teleport ====
 +
 
 +
This packet is sent by the server when an entity moves more than 8 blocks.
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  ! Key
+
  |rowspan="7"| 0x56
  ! Default
+
  |rowspan="7"| Play
  ! Min
+
  |rowspan="7"| Client
  ! Max
+
  | Entity ID
  ! Label
+
  | VarInt
 +
|
 
  |-
 
  |-
  | generic.maxHealth
+
  | X
  | 20.0
+
  | Double
  | 0.0
+
  |  
| 1024.0
 
| Max Health
 
 
  |-
 
  |-
  | generic.followRange
+
  | Y
  | 32.0
+
  | Double
  | 0.0
+
  |  
| 2048.0
 
| Follow Range
 
 
  |-
 
  |-
  | generic.knockbackResistance
+
  | Z
  | 0.0
+
  | Double
  | 0.0
+
  |  
| 1.0
 
| Knockback Resistance
 
 
  |-
 
  |-
  | generic.movementSpeed
+
  | Yaw
  | 0.699999988079071
+
  | Angle
  | 0.0
+
  | New angle, not a delta
| 1024.0
 
| Movement Speed
 
 
  |-
 
  |-
  | generic.attackDamage
+
  | Pitch
  | 2.0
+
  | Angle
  | 0.0
+
  | New angle, not a delta
| 2048.0
 
| Attack Damage
 
 
  |-
 
  |-
  | generic.attackSpeed
+
  | On Ground
  | 4.0
+
  | Boolean
  | 0.0
+
  |  
  | 1024.0
+
  |}
  | Attack Speed
+
 
 +
==== Advancements ====
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
!colspan="2"| Field Name
 +
  !colspan="2"| Field Type
 +
! Notes
 
  |-
 
  |-
  | generic.flyingSpeed
+
  |rowspan="9"| 0x57
  | 0.4000000059604645
+
|rowspan="9"| Play
  | 0.0
+
  |rowspan="9"| Client
  | 1024.0
+
  |colspan="2"| Reset/Clear
  | Flying Speed
+
  |colspan="2"| Boolean
 +
  | Whether to reset/clear the current advancements
 
  |-
 
  |-
  | horse.jumpStrength
+
  |colspan="2"| Mapping size
| 0.7
+
  |colspan="2"| VarInt
  | 0.0
+
  | Size of the following array
| 2.0
 
  | Jump Strength
 
 
  |-
 
  |-
  | zombie.spawnReinforcements
+
  |rowspan="2"| Advancement mapping
  | 0.0
+
  | Key
  | 0.0
+
  |rowspan="2"| Array
  | 1.0
+
  | Identifier
  | Spawn Reinforcements Chance
+
  | The identifier of the advancement
 
  |-
 
  |-
  | generic.reachDistance
+
  | Value
  | 5.0
+
  | Advancement
  | 0.0
+
  | See below
| 1024.0
 
| Player Reach Distance (Forge only)
 
 
  |-
 
  |-
  | forge.swimSpeed
+
  |colspan="2"| List size
| 1.0
+
  |colspan="2"| VarInt
  | 0.0
+
  | Size of the following array
| 1024.0
 
  | Swimming Speed (Forge only)
 
|}
 
 
 
''Modifier Data'' structure:
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
  ! Field Name
+
  |colspan="2"| Identifiers
  ! Field Type
+
  |colspan="2"| Array of Identifier
  ! Notes
+
  | The identifiers of the advancements that should be removed
 
  |-
 
  |-
  | UUID
+
  |colspan="2"| Progress size
  | UUID
+
  |colspan="2"| VarInt
  |  
+
  | Size of the following array
 
  |-
 
  |-
  | Amount
+
  |rowspan="2"| Progress mapping
  | Double
+
| Key
  | May be positive or negative
+
|rowspan="2"| Array
 +
  | Identifier
 +
  | The identifier of the advancement
 
  |-
 
  |-
  | Operation
+
  | Value
  | Byte
+
  | Advancement progress
 
  | See below
 
  | See below
 
  |}
 
  |}
  
The operation controls how the base value of the modifier is changed.
+
Advancement structure:
 
 
* 0: Add/subtract amount
 
* 1: Add/subtract amount percent of the current value
 
* 2: Multiply by amount percent
 
 
 
All of the 0's are applied first, and then the 1's, and then the 2's.
 
 
 
==== Entity Effect ====
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  !colspan="2"| Field Name
! State
+
  !colspan="2"| Field Type
! Bound To
 
! Field Name
 
  ! Field Type
 
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x59
+
  |colspan="2"| Has parent
  |rowspan="5"| Play
+
  |colspan="2"| Boolean
|rowspan="5"| Client
+
  | Indicates whether the next field exists.
| Entity ID
 
| VarInt
 
  |  
 
 
  |-
 
  |-
  | Effect ID
+
  |colspan="2"| Parent id
  | Byte
+
  |colspan="2"| Optional Identifier
  | See {{Minecraft Wiki|Status effect#List of effects|this table}}
+
  | The identifier of the parent advancement.
 
  |-
 
  |-
  | Amplifier
+
  |colspan="2"| Has display
  | Byte
+
  |colspan="2"| Boolean
  | Notchian client displays effect level as Amplifier + 1
+
  | Indicates whether the next field exists
 
  |-
 
  |-
  | Duration
+
  |colspan="2"| Display data
 +
|colspan="2"| Optional advancement display
 +
| See below.
 +
|-
 +
|colspan="2"| Number of criteria
 +
|colspan="2"| VarInt
 +
| Size of the following array
 +
|-
 +
|rowspan="2"| Criteria
 +
| Key
 +
|rowspan="2"| Array
 +
| Identifier
 +
| The identifier of the criterion
 +
|-
 +
| Value
 +
| '''Void'''
 +
| There is ''no'' content written here.  Perhaps this will be expanded in the future?
 +
|-
 +
|colspan="2"| Array length
 +
|colspan="2"| VarInt
 +
| Number of arrays in the following array
 +
|-
 +
|rowspan="2"| Requirements
 +
| Array length 2
 +
|rowspan="2"| Array
 
  | VarInt
 
  | VarInt
  | Seconds
+
  | Number of elements in the following array
 
  |-
 
  |-
  | Flags
+
  | Requirement
  | Byte
+
  | Array of String
  | Bit field, see below.
+
  | Array of required criteria
 
  |}
 
  |}
  
Within flags:
+
Advancement display:
 
 
* 0x01: Is ambient - was the effect spawned from a beacon?  All beacon-generated effects are ambient.  Ambient effects use a different icon in the HUD (blue border rather than gray).  If all effects on an entity are ambient, the [[Entities#Living|"Is potion effect ambient" living metadata field]] should be set to true.  Usually should not be enabled.
 
* 0x02: Show particles - should all particles from this effect be hidden?  Effects with particles hidden are not included in the calculation of the effect color, and are not rendered on the HUD (but are still rendered within the inventory).  Usually should be enabled.
 
* 0x04: Show icon - should the icon be displayed on the client?  Usually should be enabled.
 
 
 
==== Declare Recipes ====
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! Field Name
! State
+
  ! Field Type
! Bound To
 
!colspan="2"| Field Name
 
  !colspan="2"| Field Type
 
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x5A
+
  | Title
  |rowspan="4"| Play
+
| Chat
  |rowspan="4"| Client
+
  |
  |colspan="2"| Num Recipes
+
  |-
  |colspan="2"| VarInt
+
  | Description
  | Number of elements in the following array
+
  | Chat
 +
  |
 
  |-
 
  |-
  |rowspan="3"| Recipe
+
  | Icon
| Recipe ID
+
  | [[Slot]]
|rowspan="3"| Array
 
  | Identifier
 
 
  |
 
  |
 
  |-
 
  |-
  | Type
+
  | Frame type
  | String
+
  | VarInt enum
  | The recipe type, see below
+
  | 0 = <code>task</code>, 1 = <code>challenge</code>, 2 = <code>goal</code>
 +
|-
 +
| Flags
 +
| Integer
 +
| 0x1: has background texture; 0x2: <code>show_toast</code>; 0x4: <code>hidden</code>
 +
|-
 +
| Background texture
 +
| Optional Identifier
 +
| Background texture location.  Only if flags indicates it.
 +
|-
 +
| X coord
 +
| Float
 +
|
 
  |-
 
  |-
  | Data
+
  | Y coord
  | Optional, varies
+
  | Float
  | Additional data for the recipe.  For some types, there will be no data.
+
  |  
 
  |}
 
  |}
  
Recipe types:
+
Advancement progress:
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Type
+
  !colspan="2"| Field Name
  ! Description
+
!colspan="2"| Field Type
  ! Data
+
  ! Notes
 +
|-
 +
|colspan="2"| Size
 +
  |colspan="2"| VarInt
 +
| Size of the following array
 
  |-
 
  |-
  | <code>crafting_shapeless</code>
+
  |rowspan="2"| Criteria
  | Shapeless crafting recipe.  All items in the ingredient list must be present, but in any order/slot.
+
  | Criterion identifier
  | As follows:
+
  |rowspan="2"| Array
  {| class="wikitable"
+
| Identifier
    ! Name
+
| The identifier of the criterion.
    ! Type
+
  |-
    ! Description
+
| Criterion progress
    |-
+
| Criterion progress
    | Group
+
|
    | String
+
|}
    | Used to group similar recipes together in the recipe bookTag is present in recipe JSON.
+
 
    |-
+
Criterion progress:
    | Ingredient count
+
 
    | VarInt
+
{| class="wikitable"
    | Number of elements in the following array
+
! Field Name
    |-
+
! Field Type
    | Ingredients
+
! Notes
    | Array of Ingredient
+
|-
    |
+
| Achieved
    |-
+
| Boolean
    | Result
+
| If true, next field is present
    | [[Slot]]
 
    |
 
    |}
 
 
  |-
 
  |-
  | <code>crafting_shaped</code>
+
  | Date of achieving
  | Shaped crafting recipe. All items must be present in the same pattern (which may be flipped horizontally or translated)
+
| Optional Long
| As follows:
+
| As returned by [https://docs.oracle.com/javase/6/docs/api/java/util/Date.html#getTime() <code>Date.getTime</code>]
  {| class="wikitable"
+
  |}
    ! Name
+
 
    ! Type
+
==== Entity Properties ====
    ! Description
+
 
    |-
+
Sets {{Minecraft Wiki|Attribute|attributes}} on the given entity.
    | Width
+
 
    | VarInt
+
{| class="wikitable"
    |
+
! Packet ID
    |-
+
! State
    | Height
+
! Bound To
    | VarInt
+
!colspan="2"| Field Name
    |
+
  !colspan="2"| Field Type
    |-
+
  ! Notes
    | Group
 
    | String
 
    | Used to group similar recipes together in the recipe book. Tag is present in recipe JSON.
 
    |-
 
    | Ingredients
 
    | Array of Ingredient
 
    | Length is width * height. Indexed by x + (y * width).
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |}
 
 
  |-
 
  |-
  | <code>crafting_special_armordye</code>
+
  |rowspan="6"| 0x58
  | Recipe for dying leather armor
+
|rowspan="6"| Play
  | None
+
|rowspan="6"| Client
 +
  |colspan="2"| Entity ID
 +
|colspan="2"| VarInt
 +
  |  
 
  |-
 
  |-
  | <code>crafting_special_bookcloning</code>
+
  |colspan="2"| Number Of Properties
  | Recipe for copying contents of written books
+
  |colspan="2"| Int
  | None
+
  | Number of elements in the following array
 
  |-
 
  |-
  | <code>crafting_special_mapcloning</code>
+
  |rowspan="4"| Property
  | Recipe for copying maps
+
| Key
  | None
+
|rowspan="4"| Array
 +
  | Identifier
 +
  | See below
 
  |-
 
  |-
  | <code>crafting_special_mapextending</code>
+
  | Value
  | Recipe for adding paper to maps
+
  | Double
  | None
+
  | See below
 
  |-
 
  |-
  | <code>crafting_special_firework_rocket</code>
+
  | Number Of Modifiers
  | Recipe for making firework rockets
+
  | VarInt
  | None
+
  | Number of elements in the following array
 
  |-
 
  |-
  | <code>crafting_special_firework_star</code>
+
  | Modifiers
  | Recipe for making firework stars
+
  | Array of Modifier Data
  | None
+
  | See {{Minecraft Wiki|Attribute#Modifiers}}. Modifier Data defined below.
 +
|}
 +
 
 +
Known Key values (see also {{Minecraft Wiki|Attribute#Modifiers}}):
 +
 
 +
{| class="wikitable"
 
  |-
 
  |-
  | <code>crafting_special_firework_star_fade</code>
+
  ! Key
  | Recipe for making firework stars fade between multiple colors
+
  ! Default
  | None
+
  ! Min
 +
! Max
 +
! Label
 
  |-
 
  |-
  | <code>crafting_special_repairitem</code>
+
  | generic.max_health
  | Recipe for repairing items via crafting
+
  | 20.0
  | None
+
  | 0.0
 +
| 1024.0
 +
| Max Health
 
  |-
 
  |-
  | <code>crafting_special_tippedarrow</code>
+
  | generic.follow_range
  | Recipe for crafting tipped arrows
+
  | 32.0
  | None
+
  | 0.0
 +
| 2048.0
 +
| Follow Range
 
  |-
 
  |-
  | <code>crafting_special_bannerduplicate</code>
+
  | generic.knockback_resistance
  | Recipe for copying banner patterns
+
  | 0.0
  | None
+
  | 0.0
 +
| 1.0
 +
| Knockback Resistance
 
  |-
 
  |-
  | <code>crafting_special_banneraddpattern</code>
+
  | generic.movement_speed
  | Recipe for adding patterns to banners
+
  | 0.7
  | None
+
  | 0.0
 +
| 1024.0
 +
| Movement Speed
 +
|-
 +
| generic.attack_damage
 +
| 2.0
 +
| 0.0
 +
| 2048.0
 +
| Attack Damage
 +
|-
 +
| generic.attack_speed
 +
| 4.0
 +
| 0.0
 +
| 1024.0
 +
| Attack Speed
 +
|-
 +
| generic.flying_speed
 +
| 0.4
 +
| 0.0
 +
| 1024.0
 +
| Flying Speed
 +
|-
 +
| generic.armor
 +
| 0.0
 +
| 0.0
 +
| 30.0
 +
| Armor
 +
|-
 +
| generic.armor_toughness
 +
| 0.0
 +
| 0.0
 +
| 20.0
 +
| Armor Toughness
 
  |-
 
  |-
  | <code>crafting_special_shielddecoration</code>
+
  | generic.attack_knockback
  | Recipe for applying a banner's pattern to a shield
+
  | 0.0
  | None
+
  | 0.0
 +
| 5.0
 +
| &mdash;
 
  |-
 
  |-
  | <code>crafting_special_shulkerboxcoloring</code>
+
  | generic.luck
  | Recipe for recoloring a shulker box
+
  | 0.0
  | None
+
  | -1024.0
 +
| 1024.0
 +
| Luck
 
  |-
 
  |-
  | <code>smelting</code>
+
  | horse.jump_strength
  | Smelting recipe
+
  | 0.7
  | As follows:
+
  | 0.0
  {| class="wikitable"
+
| 2.0
    ! Name
+
| Jump Strength
    ! Type
+
|-
    ! Description
+
| zombie.spawn_reinforcements
    |-
+
| 0.0
    | Group
+
| 0.0
    | String
+
| 1.0
    | Used to group similar recipes together in the recipe book.
+
  | Spawn Reinforcements Chance
    |-
 
    | Ingredient
 
    | Ingredient
 
    |
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |-
 
    | Experience
 
    | Float
 
    |
 
    |-
 
    | Cooking time
 
    | VarInt
 
    |
 
    |}
 
  |}
 
 
 
Ingredient is defined as:
 
 
 
{| class="wikitable"
 
! Name
 
! Type
 
! Description
 
 
  |-
 
  |-
  | Count
+
  | generic.reachDistance
  | VarInt
+
  | 5.0
  | Number of elements in the following array
+
  | 0.0
 +
| 1024.0
 +
| Player Reach Distance (Forge only)
 
  |-
 
  |-
  | Items
+
  | forge.swimSpeed
  | Array of [[Slot]]
+
  | 1.0
  | Any item in this array may be used for the recipeThe count of each item should be 1.
+
  | 0.0
 +
  | 1024.0
 +
| Swimming Speed (Forge only)
 
  |}
 
  |}
  
==== Tags ====
+
Unknown attributes will cause a game crash ([https://bugs.mojang.com/browse/MC-150405 MC-150405]) due to the default minimum being larger than the default value.
 +
 
 +
''Modifier Data'' structure:
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  |-
! State
 
! Bound To
 
 
  ! Field Name
 
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x5B
+
  | UUID
|rowspan="4"| Play
+
  | UUID
|rowspan="4"| Client
+
  |  
| Block Tags
 
  | (See below)
 
  | IDs are block IDs
 
 
  |-
 
  |-
  | Item Tags
+
  | Amount
  | (See below)
+
  | Double
  | IDs are item IDs
+
  | May be positive or negative
 
  |-
 
  |-
  | Fluid Tags
+
  | Operation
  | (See below)
+
  | Byte
| IDs are fluid IDs
+
  | See below
|-
 
| Entity Tags
 
  | (See below)
 
| IDs are entity IDs
 
 
  |}
 
  |}
  
Tags look like:
+
The operation controls how the base value of the modifier is changed.
 +
 
 +
* 0: Add/subtract amount
 +
* 1: Add/subtract amount percent of the current value
 +
* 2: Multiply by amount percent
  
{| class="wikitable"
+
All of the 0's are applied first, and then the 1's, and then the 2's.
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
|-
 
|colspan="2"| Length
 
|colspan="2"| VarInt
 
| Number of elements in the following array
 
|-
 
|rowspan="3"| Tags
 
| Tag name
 
|rowspan="3"| Array
 
| Identifier
 
|
 
|-
 
| Count
 
| VarInt
 
| Number of elements in the following array
 
|-
 
| Entries
 
| Array of VarInt
 
| Numeric ID of the block/item.
 
|}
 
  
==== Acknowledge Player Digging ====
+
==== Entity Effect ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 5,371: Line 5,659:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x5C
+
  |rowspan="5"| 0x59
  |rowspan="4"| Play
+
  |rowspan="5"| Play
  |rowspan="4"| Client
+
  |rowspan="5"| Client
  | Location
+
  | Entity ID
  | Position
+
  | VarInt
  | Position where the digging was happening
+
  |  
 +
|-
 +
| Effect ID
 +
| Byte
 +
| See {{Minecraft Wiki|Status effect#List of effects|this table}}
 +
|-
 +
| Amplifier
 +
| Byte
 +
| Notchian client displays effect level as Amplifier + 1
 
  |-
 
  |-
  | Block
+
  | Duration
 
  | VarInt
 
  | VarInt
  | Block state ID of the block that should be at that position now.
+
  | Duration in ticks.
 
  |-
 
  |-
  | Status
+
  | Flags
  | VarInt enum
+
  | Byte
  | Same as Player Digging.  Only Started digging (0), Cancelled digging (1), and Finished digging (2) are used.
+
  | Bit field, see below.
|-
 
| Successful
 
| Boolean
 
| True if the digging succeeded; false if the client should undo any changes it made locally.  (How does this work?)
 
 
  |}
 
  |}
  
=== Serverbound ===
+
Within flags:
  
==== Teleport Confirm ====
+
* 0x01: Is ambient - was the effect spawned from a beacon?  All beacon-generated effects are ambient.  Ambient effects use a different icon in the HUD (blue border rather than gray).  If all effects on an entity are ambient, the [[Entities#Living|"Is potion effect ambient" living metadata field]] should be set to true.  Usually should not be enabled.
 +
* 0x02: Show particles - should all particles from this effect be hidden?  Effects with particles hidden are not included in the calculation of the effect color, and are not rendered on the HUD (but are still rendered within the inventory).  Usually should be enabled.
 +
* 0x04: Show icon - should the icon be displayed on the client?  Usually should be enabled.
  
Sent by client as confirmation of [[#Player Position And Look (clientbound)|Player Position And Look]].
+
==== Declare Recipes ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 5,401: Line 5,695:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | 0x00
+
  |rowspan="4"| 0x5A
  | Play
+
  |rowspan="4"| Play
  | Server
+
  |rowspan="4"| Client
  | Teleport ID
+
  |colspan="2"| Num Recipes
  | VarInt
+
  |colspan="2"| VarInt
  | The ID given by the [[#Player Position And Look (clientbound)|Player Position And Look]] packet
+
  | Number of elements in the following array
  |}
+
  |-
 
+
|rowspan="3"| Recipe
==== Query Block NBT ====
+
  | Type
 
+
  |rowspan="3"| Array
Used when <kbd>Shift</kbd>+<kbd>F3</kbd>+<kbd>I</kbd> is pressed while looking at a block.
+
  | Identifier
 
+
  | The recipe type, see below
{| class="wikitable"
 
  ! Packet ID
 
  ! State
 
  ! Bound To
 
  ! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x01
+
  | Recipe ID
|rowspan="2"| Play
+
  | String
|rowspan="2"| Server
+
  |  
| Transaction ID
 
  | VarInt
 
  | An incremental ID so that the client can verify that the response matches.
 
 
  |-
 
  |-
  | Location
+
  | Data
  | Position
+
  | Optional, varies
  | The location of the block to check.
+
  | Additional data for the recipe.  For some types, there will be no data.
 
  |}
 
  |}
  
==== Set Difficulty ====
+
Recipe types:
 
 
Must have at least op level 2 to use.  Appears to only be used on singleplayer; the difficulty buttons are still disabled in multiplayer.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! Type
! State
+
  ! Description
  ! Bound To
+
  ! Data
! Field Name
 
! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="1"| 0x02
+
  | <code>crafting_shapeless</code>
  |rowspan="1"| Play
+
| Shapeless crafting recipe.  All items in the ingredient list must be present, but in any order/slot.
|rowspan="1"| Server
+
  | As follows:
| New difficulty
+
  {| class="wikitable"
| Byte
+
    ! Name
| 0: peaceful, 1: easy, 2: normal, 3: hard
+
    ! Type
|}
+
    ! Description
 
+
    |-
==== Chat Message (serverbound) ====
+
    | Group
 
+
    | String
Used to send a chat message to the serverThe message may not be longer than 256 characters or else the server will kick the client.
+
    | Used to group similar recipes together in the recipe bookTag is present in recipe JSON.
 
+
    |-
If the message starts with a <code>/</code>, the server will attempt to interpret it as a command.  Otherwise, the server will broadcast the same chat message to all players on the server (including the player that sent the message), prepended with player's name.  Specifically, it will respond with a translate [[chat]] component, "<code>chat.type.text</code>" with the first parameter set to the display name of the player (including some chat component logic to support clicking the name to send a PM) and the second parameter set to the message.  See [[Chat#Processing chat|processing chat]] for more information.
+
    | Ingredient count
 
+
    | VarInt
{| class="wikitable"
+
    | Number of elements in the following array
! Packet ID
+
    |-
! State
+
    | Ingredients
! Bound To
+
    | Array of Ingredient
! Field Name
+
    |
! Field Type
+
    |-
! Notes
+
    | Result
 +
    | [[Slot]]
 +
    |
 +
    |}
 
  |-
 
  |-
  |rowspan="1"| 0x03
+
  | <code>crafting_shaped</code>
  |rowspan="1"| Play
+
| Shaped crafting recipe.  All items must be present in the same pattern (which may be flipped horizontally or translated)
  |rowspan="1"| Server
+
  | As follows:
| Message
+
  {| class="wikitable"
  | String (256)
+
    ! Name
| The client sends the raw input, not a [[Chat]] component
+
    ! Type
|}
+
    ! Description
 
+
    |-
==== Client Status ====
+
    | Width
 
+
    | VarInt
{| class="wikitable"
+
    |
  ! Packet ID
+
    |-
  ! State
+
    | Height
  ! Bound To
+
    | VarInt
! Field Name
+
    |
! Field Type
+
    |-
! Notes
+
    | Group
 +
    | String
 +
    | Used to group similar recipes together in the recipe book. Tag is present in recipe JSON.
 +
    |-
 +
    | Ingredients
 +
    | Array of Ingredient
 +
    | Length is width * height. Indexed by x + (y * width).
 +
    |-
 +
    | Result
 +
    | [[Slot]]
 +
    |
 +
    |}
 +
|-
 +
| <code>crafting_special_armordye</code>
 +
| Recipe for dying leather armor
 +
|rowspan="13"| None
 +
  |-
 +
  | <code>crafting_special_bookcloning</code>
 +
  | Recipe for copying contents of written books
 
  |-
 
  |-
  |rowspan="1"| 0x04
+
  | <code>crafting_special_mapcloning</code>
|rowspan="1"| Play
+
  | Recipe for copying maps
|rowspan="1"| Server
 
  | Action ID
 
| VarInt Enum
 
| See below
 
|}
 
 
 
''Action ID'' values:
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
  ! Action ID
+
  | <code>crafting_special_mapextending</code>
  ! Action
+
  | Recipe for adding paper to maps
! Notes
 
 
  |-
 
  |-
  | 0
+
  | <code>crafting_special_firework_rocket</code>
  | Perform respawn
+
  | Recipe for making firework rockets
| Sent when the client is ready to complete login and when the client is ready to respawn after death.
 
 
  |-
 
  |-
  | 1
+
  | <code>crafting_special_firework_star</code>
  | Request stats
+
  | Recipe for making firework stars
  | Sent when the client opens the Statistics menu
+
  |-
  |}
+
  | <code>crafting_special_firework_star_fade</code>
 
+
| Recipe for making firework stars fade between multiple colors
==== Client Settings ====
+
  |-
 
+
  | <code>crafting_special_repairitem</code>
Sent when the player connects, or when settings are changed.
+
  | Recipe for repairing items via crafting
 
 
{| class="wikitable"
 
  ! Packet ID
 
  ! State
 
  ! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="6"| 0x05
+
  | <code>crafting_special_tippedarrow</code>
|rowspan="6"| Play
+
  | Recipe for crafting tipped arrows
|rowspan="6"| Server
 
| Locale
 
| String (16)
 
  | e.g. en_GB
 
 
  |-
 
  |-
  | View Distance
+
  | <code>crafting_special_bannerduplicate</code>
  | Byte
+
  | Recipe for copying banner patterns
| Client-side render distance, in chunks
 
 
  |-
 
  |-
  | Chat Mode
+
  | <code>crafting_special_banneraddpattern</code>
  | VarInt Enum
+
  | Recipe for adding patterns to banners
| 0: enabled, 1: commands only, 2: hidden.  See [[Chat#Processing chat|processing chat]] for more information.
 
 
  |-
 
  |-
  | Chat Colors
+
  | <code>crafting_special_shielddecoration</code>
  | Boolean
+
  | Recipe for applying a banner's pattern to a shield
| “Colors” multiplayer setting
 
 
  |-
 
  |-
  | Displayed Skin Parts
+
  | <code>crafting_special_shulkerboxcoloring</code>
  | Unsigned Byte
+
  | Recipe for recoloring a shulker box
| Bit mask, see below
 
 
  |-
 
  |-
  | Main Hand
+
  | <code>smelting</code>
  | VarInt Enum
+
  | Smelting recipe
  | 0: Left, 1: Right
+
  |rowspan="4"| As follows:
|}
+
  {| class="wikitable"
 
+
    ! Name
''Displayed Skin Parts'' flags:
+
    ! Type
 
+
    ! Description
* Bit 0 (0x01): Cape enabled
+
    |-
* Bit 1 (0x02): Jacket enabled
+
    | Group
* Bit 2 (0x04): Left Sleeve enabled
+
    | String
* Bit 3 (0x08): Right Sleeve enabled
+
    | Used to group similar recipes together in the recipe book.
* Bit 4 (0x10): Left Pants Leg enabled
+
    |-
* Bit 5 (0x20): Right Pants Leg enabled
+
    | Ingredient
* Bit 6 (0x40): Hat enabled
+
    | Ingredient
 
+
    |
The most significant bit (bit 7, 0x80) appears to be unused.
+
    |-
 
+
    | Result
==== Tab-Complete (serverbound) ====
+
    | [[Slot]]
 
+
    |
Sent when the client needs to tab-complete a <code>minecraft:ask_server</code> suggestion type.
+
    |-
 
+
    | Experience
{| class="wikitable"
+
    | Float
! Packet ID
+
    |
! State
+
    |-
  ! Bound To
+
    | Cooking time
  ! Field Name
+
    | VarInt
  ! Field Type
+
    |
! Notes
+
    |}
 +
  |-
 +
  | <code>blasting</code>
 +
  | Blast furnace recipe
 
  |-
 
  |-
  |rowspan="5"| 0x06
+
  | <code>smoking</code>
|rowspan="5"| Play
+
  | Smoker recipe
|rowspan="5"| Server
 
| Transaction Id
 
| VarInt
 
  | The id received in the tab completion request packet, must match or the client will ignore this packet.  Client generates this and increments it each time it sends another tab completion that doesn't get a response.
 
 
  |-
 
  |-
  | Text
+
  | <code>campfire_cooking</code>
  | String (32500)
+
  | Campfire recipe
  | All text behind the cursor without the <code>/</code> (e.g. to the left of the cursor in left-to-right languages like English)
+
|-
 +
  | <code>stonecutting</code>
 +
| Stonecutter recipe
 +
| As follows:
 +
  {| class="wikitable"
 +
    ! Name
 +
    ! Type
 +
    ! Description
 +
    |-
 +
    | Group
 +
    | String
 +
    | Used to group similar recipes together in the recipe book.  Tag is present in recipe JSON.
 +
    |-
 +
    | Ingredient
 +
    | Ingredient
 +
    |
 +
    |-
 +
    | Result
 +
    | [[Slot]]
 +
    |
 +
    |}
 +
|-
 +
| <code>smithing</code>
 +
| Smithing table recipe
 +
| As follows:
 +
  {| class="wikitable"
 +
    ! Name
 +
    ! Type
 +
    ! Description
 +
    |-
 +
    | Base
 +
    | Ingredient
 +
    | First item
 +
    |-
 +
    | Addition
 +
    | Ingredient
 +
    | Second item
 +
    |-
 +
    | Result
 +
    | [[Slot]]
 +
    |
 +
    |}
 
  |}
 
  |}
  
==== Confirm Transaction (serverbound) ====
+
Ingredient is defined as:
  
If a transaction sent by the client was not accepted, the server will reply with a [[#Confirm Transaction (clientbound)|Confirm Transaction (clientbound)]] packet with the Accepted field set to false. When this happens, the client must send this packet to apologize (as with movement), otherwise the server ignores any successive transactions.
+
{| class="wikitable"
 +
! Name
 +
! Type
 +
! Description
 +
|-
 +
| Count
 +
| VarInt
 +
| Number of elements in the following array
 +
|-
 +
| Items
 +
| Array of [[Slot]]
 +
| Any item in this array may be used for the recipe. The count of each item should be 1.
 +
|}
 +
 
 +
==== Tags ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 5,602: Line 5,929:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x07
+
  |rowspan="4"| 0x5B
  |rowspan="3"| Play
+
  |rowspan="4"| Play
  |rowspan="3"| Server
+
  |rowspan="4"| Client
  | Window ID
+
  | Block Tags
  | Byte
+
  | (See below)
  | The ID of the window that the action occurred in
+
  | IDs are block IDs
 +
|-
 +
| Item Tags
 +
| (See below)
 +
| IDs are item IDs
 
  |-
 
  |-
  | Action Number
+
  | Fluid Tags
  | Short
+
  | (See below)
  | Every action that is to be accepted has a unique number. This number is an incrementing integer (starting at 1) with separate counts for each window ID.
+
  | IDs are fluid IDs
 
  |-
 
  |-
  | Accepted
+
  | Entity Tags
  | Boolean
+
  | (See below)
  | Whether the action was accepted
+
  | IDs are entity IDs
 
  |}
 
  |}
  
==== Click Window Button ====
+
Tags look like:
 
 
Used when clicking on window buttons.  Until 1.14, this was only used by enchantment tables.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  !colspan="2"| Field Name
! State
+
  !colspan="2"| Field Type
! Bound To
 
! Field Name
 
  ! Field Type
 
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x07
+
  |colspan="2"| Length
  |rowspan="2"| Play
+
  |colspan="2"| VarInt
  |rowspan="2"| Server
+
  | Number of elements in the following array
| Window ID
 
| Byte
 
| The ID of the window sent by [[#Open Window|Open Window]]
 
 
  |-
 
  |-
  | Button ID
+
  |rowspan="3"| Tags
| Byte
+
  | Tag name
  | Meaning depends on window type; see below
+
  |rowspan="3"| Array
  |}
+
  | Identifier
 
+
  |
{| class="wikitable"
 
  ! Window type
 
  ! ID
 
! Meaning
 
 
  |-
 
  |-
  |rowspan="3"| Enchantment Table
+
  | Count
  | 0 || Topmost enchantment
+
| VarInt
 +
  | Number of elements in the following array
 
  |-
 
  |-
  | 1 || Middle enchantment
+
  | Entries
|-
+
  | Array of VarInt
| 2 || Bottom enchantment
+
  | Numeric ID of the block/item.
|-
 
|rowspan="4"| Lectern
 
| 1 || Previous page (which does give a redstone output)
 
|-
 
| 2 || Next page
 
  |-
 
  | 3 || Take Book
 
|-
 
| 100+page || Opened page number - 100 + number
 
|-
 
| Stonecutter
 
|colspan="2"| Recipe button number - 4*row + col.  Depends on the item.
 
|-
 
| Loom
 
|colspan="2"| Recipe button number - 4*row + col.  Depends on the item.
 
 
  |}
 
  |}
  
==== Click Window ====
+
=== Serverbound ===
 +
 
 +
==== Teleport Confirm ====
  
This packet is sent by the player when it clicks on a slot in a window.
+
Sent by client as confirmation of [[#Player Position And Look (clientbound)|Player Position And Look]].
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 5,682: Line 5,989:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| 0x09
+
  | 0x00
  |rowspan="6"| Play
+
  | Play
  |rowspan="6"| Server
+
  | Server
  | Window ID
+
  | Teleport ID
  | Unsigned Byte
+
  | VarInt
  | The ID of the window which was clicked. 0 for player inventory.
+
  | The ID given by the [[#Player Position And Look (clientbound)|Player Position And Look]] packet
  |-
+
|}
  | Slot
+
 
  | Short
+
==== Query Block NBT ====
  | The clicked slot number, see below
+
 
 +
Used when <kbd>Shift</kbd>+<kbd>F3</kbd>+<kbd>I</kbd> is pressed while looking at a block.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
  ! Bound To
 +
  ! Field Name
 +
  ! Field Type
 +
  ! Notes
 
  |-
 
  |-
  | Button
+
  |rowspan="2"| 0x01
  | Byte
+
  |rowspan="2"| Play
  | The button used in the click, see below
+
  |rowspan="2"| Server
 +
| Transaction ID
 +
| VarInt
 +
| An incremental ID so that the client can verify that the response matches.
 
  |-
 
  |-
  | Action Number
+
  | Location
  | Short
+
  | Position
  | A unique number for the action, implemented by Notchian as a counter, starting at 1 (different counter for every window ID). Used by the server to send back a [[#Confirm Transaction (clientbound)|Confirm Transaction (clientbound)]].
+
  | The location of the block to check.
|-
 
| Mode
 
| VarInt Enum
 
| Inventory operation mode, see below
 
|-
 
| Clicked item
 
| [[Slot Data|Slot]]
 
| The clicked slot. Has to be empty (item ID = -1) for drop mode.
 
 
  |}
 
  |}
  
See [[Inventory]] for further information about how slots are indexed.
+
==== Query Entity NBT ====
  
When right-clicking on a stack of items, half the stack will be picked up and half left in the slot. If the stack is an odd number, the half left in the slot will be smaller of the amounts.
+
Used when <kbd>Shift</kbd>+<kbd>F3</kbd>+<kbd>I</kbd> is pressed while looking at an entity.
 
 
The distinct type of click performed by the client is determined by the combination of the Mode and Button fields.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Mode
+
  ! Packet ID
  ! Button
+
  ! State
  ! Slot
+
  ! Bound To
  ! Trigger
+
  ! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  !rowspan="2"| 0
+
  |rowspan="2"| 0x0D
  | 0
+
|rowspan="2"| Play
  | Normal
+
|rowspan="2"| Server
  | Left mouse click
+
  | Transaction ID
 +
  | VarInt
 +
  | An incremental ID so that the client can verify that the response matches.
 
  |-
 
  |-
  | 1
+
  | Entity ID
  | Normal
+
  | VarInt
  | Right mouse click
+
  | The ID of the entity to query.
 +
|}
 +
 
 +
==== Set Difficulty ====
 +
 
 +
Must have at least op level 2 to use.  Appears to only be used on singleplayer; the difficulty buttons are still disabled in multiplayer.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  !rowspan="2"| 1
+
  | 0x02
  | 0
+
| Play
  | Normal
+
| Server
  | Shift + left mouse click
+
| New difficulty
 +
| Byte
 +
  | 0: peaceful, 1: easy, 2: normal, 3: hard
 +
  |}
 +
 
 +
==== Chat Message (serverbound) ====
 +
 
 +
Used to send a chat message to the server.  The message may not be longer than 256 characters or else the server will kick the client.
 +
 
 +
If the message starts with a <code>/</code>, the server will attempt to interpret it as a command.  Otherwise, the server will broadcast the same chat message to all players on the server (including the player that sent the message), prepended with player's name.  Specifically, it will respond with a translate [[chat]] component, "<code>chat.type.text</code>" with the first parameter set to the display name of the player (including some chat component logic to support clicking the name to send a PM) and the second parameter set to the message. See [[Chat#Processing chat|processing chat]] for more information.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 1
+
  | 0x03
  | Normal
+
  | Play
  | Shift + right mouse click ''(identical behavior)''
+
  | Server
 +
| Message
 +
| String (256)
 +
| The client sends the raw input, not a [[Chat]] component
 +
|}
 +
 
 +
==== Client Status ====
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
| 0x04
 +
| Play
 +
| Server
 +
| Action ID
 +
| VarInt Enum
 +
| See below
 +
|}
 +
 
 +
''Action ID'' values:
 +
 
 +
{| class="wikitable"
 +
|-
 +
! Action ID
 +
! Action
 +
! Notes
 
  |-
 
  |-
!rowspan="5"| 2
 
 
  | 0
 
  | 0
  | Normal
+
  | Perform respawn
  | Number key 1
+
  | Sent when the client is ready to complete login and when the client is ready to respawn after death.
 
  |-
 
  |-
 
  | 1
 
  | 1
  | Normal
+
  | Request stats
  | Number key 2
+
  | Sent when the client opens the Statistics menu
 +
|}
 +
 
 +
==== Client Settings ====
 +
 
 +
Sent when the player connects, or when settings are changed.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 2
+
  |rowspan="6"| 0x05
  | Normal
+
|rowspan="6"| Play
  | Number key 3
+
|rowspan="6"| Server
 +
| Locale
 +
  | String (16)
 +
  | e.g. en_GB
 
  |-
 
  |-
  |
+
  | View Distance
  |
+
  | Byte
  |
+
  | Client-side render distance, in chunks
 
  |-
 
  |-
  | 8
+
  | Chat Mode
  | Normal
+
  | VarInt Enum
  | Number key 9
+
  | 0: enabled, 1: commands only, 2: hidden.  See [[Chat#Processing chat|processing chat]] for more information.
 
  |-
 
  |-
  !rowspan="1"| 3
+
  | Chat Colors
  | 2
+
  | Boolean
  | Normal
+
  | “Colors” multiplayer setting
| Middle click, only defined for creative players in non-player inventories.
 
 
  |-
 
  |-
  !rowspan="4"| 4
+
  | Displayed Skin Parts
  | 0
+
  | Unsigned Byte
  | Normal*
+
  | Bit mask, see below
| Drop key (Q) (* Clicked item is different, see above)
 
 
  |-
 
  |-
  | 1
+
  | Main Hand
  | Normal*
+
| VarInt Enum
  | Ctrl + Drop key (Ctrl-Q) ''(drops full stack)''
+
  | 0: Left, 1: Right
|-
+
  |}
| 0
+
 
| -999
+
''Displayed Skin Parts'' flags:
| Left click outside inventory holding nothing ''(no-op)''
+
 
  |-
+
* Bit 0 (0x01): Cape enabled
  | 1
+
* Bit 1 (0x02): Jacket enabled
  | -999
+
* Bit 2 (0x04): Left Sleeve enabled
  | Right click outside inventory holding nothing ''(no-op)''
+
* Bit 3 (0x08): Right Sleeve enabled
 +
* Bit 4 (0x10): Left Pants Leg enabled
 +
* Bit 5 (0x20): Right Pants Leg enabled
 +
* Bit 6 (0x40): Hat enabled
 +
 
 +
The most significant bit (bit 7, 0x80) appears to be unused.
 +
 
 +
==== Tab-Complete (serverbound) ====
 +
 
 +
Sent when the client needs to tab-complete a <code>minecraft:ask_server</code> suggestion type.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
  ! Bound To
 +
  ! Field Name
 +
  ! Field Type
 +
  ! Notes
 
  |-
 
  |-
  !rowspan="9"| 5
+
  |rowspan="2"| 0x06
  | 0
+
|rowspan="2"| Play
  | -999
+
  |rowspan="2"| Server
  | Starting left mouse drag
+
  | Transaction Id
 +
  | VarInt
 +
| The id received in the tab completion request packet, must match or the client will ignore this packet.  Client generates this and increments it each time it sends another tab completion that doesn't get a response.
 
  |-
 
  |-
  | 4
+
  | Text
  | -999
+
  | String (32500)
  | Starting right mouse drag
+
| All text behind the cursor without the <code>/</code> (e.g. to the left of the cursor in left-to-right languages like English)
 +
  |}
 +
 
 +
==== Window Confirmation (serverbound) ====
 +
 
 +
If a confirmation sent by the client was not accepted, the server will reply with a [[#Window Confirmation (clientbound)|Window Confirmation (clientbound)]] packet with the Accepted field set to false. When this happens, the client must send this packet to apologize (as with movement), otherwise the server ignores any successive confirmations.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 8
+
  |rowspan="3"| 0x07
  | -999
+
|rowspan="3"| Play
  | Starting middle mouse drag, only defined for creative players in non-player inventories. (Note: the vanilla client will still incorrectly send this for non-creative players - see [https://bugs.mojang.com/browse/MC-46584 MC-46584])
+
|rowspan="3"| Server
 +
  | Window ID
 +
  | Byte
 +
  | The ID of the window that the action occurred in
 
  |-
 
  |-
  | 1
+
  | Action Number
  | Normal
+
  | Short
  | Add slot for left-mouse drag
+
  | Every action that is to be accepted has a unique number. This number is an incrementing integer (starting at 1) with separate counts for each window ID.
 
  |-
 
  |-
  | 5
+
  | Accepted
  | Normal
+
  | Boolean
  | Add slot for right-mouse drag
+
  | Whether the action was accepted
|-
 
| 9
 
| Normal
 
| Add slot for middle-mouse drag, only defined for creative players in non-player inventories.  (Note: the vanilla client will still incorrectly send this for non-creative players - see [https://bugs.mojang.com/browse/MC-46584 MC-46584])
 
|-
 
| 2
 
| -999
 
| Ending left mouse drag
 
|-
 
| 6
 
| -999
 
| Ending right mouse drag
 
|-
 
| 10
 
| -999
 
| Ending middle mouse drag, only defined for creative players in non-player inventories.  (Note: the vanilla client will still incorrectly send this for non-creative players - see [https://bugs.mojang.com/browse/MC-46584 MC-46584])
 
|-
 
! 6
 
| 0
 
| Normal
 
| Double click
 
 
  |}
 
  |}
  
Starting from version 1.5, “painting mode” is available for use in inventory windows. It is done by picking up stack of something (more than 1 item), then holding mouse button (left, right or middle) and dragging held stack over empty (or same type in case of right button) slots. In that case client sends the following to server after mouse button release (omitting first pickup packet which is sent as usual):
+
==== Click Window Button ====
  
# packet with mode 5, slot -999, button (0 for left | 4 for right);
+
Used when clicking on window buttons.  Until 1.14, this was only used by enchantment tables.
# packet for every slot painted on, mode is still 5, button (1 | 5);
 
# packet with mode 5, slot -999, button (2 | 6);
 
 
 
If any of the painting packets other than the “progress” ones are sent out of order (for example, a start, some slots, then another start; or a left-click in the middle) the painting status will be reset.
 
 
 
The server will send back a [[#Confirm Transaction (clientbound)|Confirm Transaction]] packet. If the click was not accepted, the client must send a matching [[#Confirm Transaction (serverbound)|serverbound confirm transaction]] packet before sending more [[#Click Window|Click Window]] packets, otherwise the server will reject them silently. The Notchian server also sends a [[#Window Items|Window Items]] packet for the open window and [[#Set Slot|Set Slot]] packets for the clicked and cursor slot, but only when the click was not accepted, probably to resynchronize client and server.
 
 
 
==== Close Window (serverbound) ====
 
 
 
This packet is sent by the client when closing a window.
 
 
 
Notchian clients send a Close Window packet with Window ID 0 to close their inventory even though there is never an [[#Open Window|Open Window]] packet for the inventory.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 5,850: Line 6,238:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | 0x0A
+
  |rowspan="2"| 0x08
  | Play
+
  |rowspan="2"| Play
  | Server
+
  |rowspan="2"| Server
 
  | Window ID
 
  | Window ID
  | Unsigned Byte
+
  | Byte
  | This is the ID of the window that was closed. 0 for player inventory.
+
  | The ID of the window sent by [[#Open Window|Open Window]]
 +
|-
 +
| Button ID
 +
| Byte
 +
| Meaning depends on window type; see below
 
  |}
 
  |}
  
==== Plugin Message (serverbound) ====
+
{| class="wikitable"
 +
! Window type
 +
! ID
 +
! Meaning
 +
|-
 +
|rowspan="3"| Enchantment Table
 +
| 0 || Topmost enchantment
 +
|-
 +
| 1 || Middle enchantment
 +
|-
 +
| 2 || Bottom enchantment
 +
|-
 +
|rowspan="4"| Lectern
 +
| 1 || Previous page (which does give a redstone output)
 +
|-
 +
| 2 || Next page
 +
|-
 +
| 3 || Take Book
 +
|-
 +
| 100+page || Opened page number - 100 + number
 +
|-
 +
| Stonecutter
 +
|colspan="2"| Recipe button number - 4*row + col.  Depends on the item.
 +
|-
 +
| Loom
 +
|colspan="2"| Recipe button number - 4*row + col.  Depends on the item.
 +
|}
  
{{Main|Plugin channels}}
+
==== Click Window ====
  
Mods and plugins can use this to send their data. Minecraft itself uses some [[plugin channel]]s. These internal channels are in the <code>minecraft</code> namespace.
+
This packet is sent by the player when it clicks on a slot in a window.
 
 
More documentation on this: [http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/ http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/]
 
 
 
Note that the length of Data is known only from the packet length, since the packet has no length field of any kind.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 5,876: Line 6,290:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x0B
+
  |rowspan="6"| 0x09
  |rowspan="2"| Play
+
  |rowspan="6"| Play
  |rowspan="2"| Server
+
  |rowspan="6"| Server
  | Channel
+
  | Window ID
  | Identifier
+
  | Unsigned Byte
  | Name of the [[plugin channel]] used to send the data
+
  | The ID of the window which was clicked. 0 for player inventory.
 +
|-
 +
| Slot
 +
| Short
 +
| The clicked slot number, see below
 
  |-
 
  |-
  | Data
+
  | Button
  | Byte Array
+
  | Byte
  | Any data, depending on the channel. <code>minecraft:</code> channels are documented [[plugin channel|here]].  The length of this array must be inferred from the packet length.
+
  | The button used in the click, see below
|}
 
 
 
==== Edit Book ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x0C
+
  | Action Number
  |rowspan="3"| Play
+
  | Short
|rowspan="3"| Server
+
  | A unique number for the action, implemented by Notchian as a counter, starting at 1 (different counter for every window ID). Used by the server to send back a [[#Confirm Transaction (clientbound)|Confirm Transaction (clientbound)]].
| New book
 
  | [[Slot]]
 
|
 
 
  |-
 
  |-
  | Is signing
+
  | Mode
  | Boolean
+
  | VarInt Enum
  | True if the player is signing the book; false if the player is saving a draft.
+
  | Inventory operation mode, see below
 
  |-
 
  |-
  | Hand
+
  | Clicked item
  | VarInt enum
+
  | [[Slot Data|Slot]]
  | 0: Main hand, 1: Off hand
+
  | The clicked slot. Has to be empty (item ID = -1) for drop mode.
 
  |}
 
  |}
  
When editing a draft, the [[NBT]] section of the Slot contains this:
+
See [[Inventory]] for further information about how slots are indexed.
 +
 
 +
When right-clicking on a stack of items, half the stack will be picked up and half left in the slot. If the stack is an odd number, the half left in the slot will be smaller of the amounts.
 +
 
 +
The distinct type of click performed by the client is determined by the combination of the Mode and Button fields.
  
<pre>
+
{| class="wikitable"
TAG_Compound(<nowiki>''</nowiki>): 1 entry
+
  ! Mode
{
+
  ! Button
  TAG_List('pages'): 2 entries
+
  ! Slot
  {
+
  ! Trigger
    TAG_String(0): 'Something on Page 1'
+
|-
    TAG_String(1): 'Something on Page 2'
+
  !rowspan="2"| 0
  }
+
| 0
}
+
| Normal
</pre>
+
  | Left mouse click
 
 
When signing the book, it instead looks like this:
 
 
 
<pre>
 
TAG_Compound(<nowiki>''</nowiki>): 3 entires
 
{
 
  TAG_String('author'): 'Steve'
 
  TAG_String('title'): 'A Wonderful Book'
 
  TAG_List('pages'): 2 entries
 
  {
 
    TAG_String(0): 'Something on Page 1'
 
    TAG_String(1): 'Something on Page 2'
 
  }
 
}
 
</pre>
 
 
 
==== Entity NBT Request ====
 
 
 
Used when <kbd>Shift</kbd>+<kbd>F3</kbd>+<kbd>I</kbd> is pressed while looking at an entity.
 
 
 
{| class="wikitable"
 
  ! Packet ID
 
  ! State
 
  ! Bound To
 
  ! Field Name
 
  ! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x0D
+
  | 1
|rowspan="2"| Play
+
  | Normal
|rowspan="2"| Server
+
  | Right mouse click
| Transaction ID
 
  | VarInt
 
  | An incremental ID so that the client can verify that the response matches.
 
 
  |-
 
  |-
  | Entity ID
+
  !rowspan="2"| 1
  | VarInt
+
  | 0
  | The ID of the entity to query.
+
  | Normal
  |}
+
  | Shift + left mouse click
 
 
==== Interact Entity ====
 
 
 
This packet is sent from the client to the server when the client attacks or right-clicks another entity (a player, minecart, etc).
 
 
 
A Notchian server only accepts this packet if the entity being attacked/used is visible without obstruction and within a 4-unit radius of the player's position.
 
 
 
Note that middle-click in creative mode is interpreted by the client and sent as a [[#Creative Inventory Action|Creative Inventory Action]] packet instead.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="6"| 0x0E
+
  | 1
|rowspan="6"| Play
+
  | Normal
|rowspan="6"| Server
+
  | Shift + right mouse click ''(identical behavior)''
| Entity ID
 
  | VarInt
 
  | The ID of the entity to interact
 
 
  |-
 
  |-
  | Type
+
  !rowspan="5"| 2
  | VarInt Enum
+
  | 0
  | 0: interact, 1: attack, 2: interact at
+
  | Normal
 +
| Number key 1
 
  |-
 
  |-
  | Target X
+
  | 1
  | Optional Float
+
  | Normal
  | Only if Type is interact at
+
  | Number key 2
 
  |-
 
  |-
  | Target Y
+
  | 2
  | Optional Float
+
  | Normal
  | Only if Type is interact at
+
  | Number key 3
 
  |-
 
  |-
  | Target Z
+
  |
  | Optional Float
+
  |
  | Only if Type is interact at
+
  |
 
  |-
 
  |-
  | Hand
+
  | 8
  | Optional VarInt Enum
+
  | Normal
  | Only if Type is interact or interact at; 0: main hand, 1: off hand
+
  | Number key 9
  |}
+
  |-
 
+
  ! 3
==== Keep Alive (serverbound) ====
+
  | 2
 
+
  | Normal
The server will frequently send out a keep-alive, each containing a random ID. The client must respond with the same packet.
+
  | Middle click, only defined for creative players in non-player inventories.
 
 
{| class="wikitable"
 
  ! Packet ID
 
  ! State
 
  ! Bound To
 
  ! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  | 0x0F
+
  !rowspan="4"| 4
  | Play
+
  | 0
  | Server
+
  | Normal*
| Keep Alive ID
+
  | Drop key (Q) (* Clicked item is different, see above)
| Long
 
|
 
|}
 
 
 
==== Lock Difficulty ====
 
 
 
Must have at least op level 2 to use. Appears to only be used on singleplayer; the difficulty buttons are still disabled in multiplayer.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="1"| 0x10
+
  | 1
  |rowspan="1"| Play
+
  | Normal*
  |rowspan="1"| Server
+
  | Ctrl + Drop key (Ctrl-Q) ''(drops full stack)''
  | Locked
+
  |-
  | Boolean
+
  | 0
  |
+
  | -999
  |}
+
  | Left click outside inventory holding nothing ''(no-op)''
 
 
==== Player Position ====
 
 
 
Updates the player's XYZ position on the server.
 
 
 
Checking for moving too fast is achieved like this:
 
 
 
* Each server tick, the player's current position is stored
 
* When a player moves, the changes in x, y, and z coordinates are compared with the positions from the previous tick (&Delta;x, &Delta;y, &Delta;z)
 
* Total movement distance squared is computed as &Delta;x&sup2; + &Delta;y&sup2; + &Delta;z&sup2;
 
* The expected movement distance squared is computed as velocityX&sup2; + veloctyY&sup2; + velocityZ&sup2;
 
* If the total movement distance squared value minus the expected movement distance squared value is more than 100 (300 if the player is using an elytra), they are moving too fast.
 
 
 
If the player is moving too fast, it will be logged that "<player> moved too quickly! " followed by the change in x, y, and z, and the player will be teleported back to their current (before this packet) serverside position.
 
 
 
Also, if the absolute value of X or the absolute value of Z is a value greater than 3.2×10<sup>7</sup>, or X, Y, or Z are not finite (either positive infinity, negative infinity, or NaN), the client will be kicked for “Invalid move player packet received”.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="4"| 0x11
+
  | 1
|rowspan="4"| Play
+
  | -999
|rowspan="4"| Server
+
  | Right click outside inventory holding nothing ''(no-op)''
| X
 
  | Double
 
  | Absolute position
 
 
  |-
 
  |-
  | Feet Y
+
  !rowspan="9"| 5
  | Double
+
  | 0
  | Absolute feet position, normally Head Y - 1.62
+
  | -999
 +
| Starting left mouse drag
 
  |-
 
  |-
  | Z
+
  | 4
  | Double
+
  | -999
  | Absolute position
+
  | Starting right mouse drag
 
  |-
 
  |-
  | On Ground
+
  | 8
  | Boolean
+
  | -999
  | True if the client is on the ground, false otherwise
+
  | Starting middle mouse drag, only defined for creative players in non-player inventories.  (Note: the vanilla client will still incorrectly send this for non-creative players - see [https://bugs.mojang.com/browse/MC-46584 MC-46584])
|}
+
|-
 
+
| 1
==== Player Position And Rotation(serverbound) ====
+
| Normal
 
+
| Add slot for left-mouse drag
A combination of [[#Player Rotation|Player Rotation]] and [[#Player Position|Player Position]].
+
|-
 +
| 5
 +
| Normal
 +
| Add slot for right-mouse drag
 +
|-
 +
| 9
 +
| Normal
 +
| Add slot for middle-mouse drag, only defined for creative players in non-player inventories.  (Note: the vanilla client will still incorrectly send this for non-creative players - see [https://bugs.mojang.com/browse/MC-46584 MC-46584])
 +
|-
 +
| 2
 +
| -999
 +
| Ending left mouse drag
 +
|-
 +
| 6
 +
| -999
 +
| Ending right mouse drag
 +
|-
 +
| 10
 +
| -999
 +
| Ending middle mouse drag, only defined for creative players in non-player inventories.  (Note: the vanilla client will still incorrectly send this for non-creative players - see [https://bugs.mojang.com/browse/MC-46584 MC-46584])
 +
|-
 +
! 6
 +
| 0
 +
| Normal
 +
| Double click
 +
|}
 +
 
 +
Starting from version 1.5, “painting mode” is available for use in inventory windows. It is done by picking up stack of something (more than 1 item), then holding mouse button (left, right or middle) and dragging held stack over empty (or same type in case of right button) slots. In that case client sends the following to server after mouse button release (omitting first pickup packet which is sent as usual):
 +
 
 +
# packet with mode 5, slot -999, button (0 for left | 4 for right);
 +
# packet for every slot painted on, mode is still 5, button (1 | 5);
 +
# packet with mode 5, slot -999, button (2 | 6);
 +
 
 +
If any of the painting packets other than the “progress” ones are sent out of order (for example, a start, some slots, then another start; or a left-click in the middle) the painting status will be reset.
 +
 
 +
The server will send back a [[#Confirm Transaction (clientbound)|Confirm Transaction]] packet. If the click was not accepted, the client must send a matching [[#Confirm Transaction (serverbound)|serverbound confirm transaction]] packet before sending more [[#Click Window|Click Window]] packets, otherwise the server will reject them silently. The Notchian server also sends a [[#Window Items|Window Items]] packet for the open window and [[#Set Slot|Set Slot]] packets for the clicked and cursor slot, but only when the click was not accepted, probably to resynchronize client and server.
 +
 
 +
==== Close Window (serverbound) ====
 +
 
 +
This packet is sent by the client when closing a window.
 +
 
 +
Notchian clients send a Close Window packet with Window ID 0 to close their inventory even though there is never an [[#Open Window|Open Window]] packet for the inventory.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,106: Line 6,458:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| 0x12
+
  | 0x0A
  |rowspan="6"| Play
+
  | Play
  |rowspan="6"| Server
+
  | Server
  | X
+
  | Window ID
  | Double
+
  | Unsigned Byte
  | Absolute position
+
  | This is the ID of the window that was closed. 0 for player inventory.
|-
 
| Feet Y
 
| Double
 
| Absolute feet position, normally Head Y - 1.62
 
|-
 
| Z
 
| Double
 
| Absolute position
 
|-
 
| Yaw
 
| Float
 
| Absolute rotation on the X Axis, in degrees
 
|-
 
| Pitch
 
| Float
 
| Absolute rotation on the Y Axis, in degrees
 
|-
 
| On Ground
 
| Boolean
 
| True if the client is on the ground, false otherwise
 
 
  |}
 
  |}
  
==== Player Rotation ====
+
==== Plugin Message (serverbound) ====
[[File:Minecraft-trig-yaw.png|thumb|The unit circle for yaw]]
 
[[File:Yaw.png|thumb|The unit circle of yaw, redrawn]]
 
  
Updates the direction the player is looking in.
+
{{Main|Plugin channels}}
  
Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0,-1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.
+
Mods and plugins can use this to send their data. Minecraft itself uses some [[plugin channel]]s. These internal channels are in the <code>minecraft</code> namespace.
  
Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.
+
More documentation on this: [http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/ http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/]
  
The yaw and pitch of player (in degrees), standing at point (x0, y0, z0) and looking towards point (x, y, z) can be calculated with:
+
Note that the length of Data is known only from the packet length, since the packet has no length field of any kind.
 
 
dx = x-x0
 
dy = y-y0
 
dz = z-z0
 
r = sqrt( dx*dx + dy*dy + dz*dz )
 
yaw = -atan2(dx,dz)/PI*180
 
if yaw < 0 then
 
    yaw = 360 + yaw
 
pitch = -arcsin(dy/r)/PI*180
 
 
 
You can get a unit vector from a given yaw/pitch via:
 
 
 
x = -cos(pitch) * sin(yaw)
 
y = -sin(pitch)
 
z =  cos(pitch) * cos(yaw)
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,169: Line 6,484:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x13
+
  |rowspan="2"| 0x0B
  |rowspan="3"| Play
+
  |rowspan="2"| Play
  |rowspan="3"| Server
+
  |rowspan="2"| Server
  | Yaw
+
  | Channel
  | Float
+
  | Identifier
  | Absolute rotation on the X Axis, in degrees
+
  | Name of the [[plugin channel]] used to send the data
 
  |-
 
  |-
  | Pitch
+
  | Data
  | Float
+
  | Byte Array
  | Absolute rotation on the Y Axis, in degrees
+
  | Any data, depending on the channel. <code>minecraft:</code> channels are documented [[plugin channel|here]]. The length of this array must be inferred from the packet length.
|-
 
| On Ground
 
  | Boolean
 
| True if the client is on the ground, False otherwise
 
 
  |}
 
  |}
  
==== Player Movement ====
+
==== Edit Book ====
 
 
This packet as well as [[#Player Position|Player Position]], [[#Player Look|Player Look]], and [[#Player Position And Look 2|Player Position And Look]] are called the “serverbound movement packets”. Vanilla clients will send Player Position once every 20 ticks even for a stationary player.
 
 
 
This packet is used to indicate whether the player is on ground (walking/swimming), or airborne (jumping/falling).
 
 
 
When dropping from sufficient height, fall damage is applied when this state goes from false to true. The amount of damage applied is based on the point where it last changed from true to false. Note that there are several movement related packets containing this state.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,201: Line 6,506:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x14
+
  |rowspan="3"| 0x0C
  |rowspan="1"| Play
+
  |rowspan="3"| Play
  |rowspan="1"| Server
+
  |rowspan="3"| Server
  | On Ground
+
  | New book
 +
| [[Slot]]
 +
|
 +
|-
 +
| Is signing
 
  | Boolean
 
  | Boolean
  | True if the client is on the ground, false otherwise
+
  | True if the player is signing the book; false if the player is saving a draft.
 +
|-
 +
| Hand
 +
| VarInt enum
 +
| 0: Main hand, 1: Off hand
 
  |}
 
  |}
  
==== Vehicle Move (serverbound) ====
+
When editing a draft, the [[NBT]] section of the Slot contains this:
  
Sent when a player moves in a vehicle. Fields are the same as in [[#Player Position And Look (serverbound)|Player Position And Look]]. Note that all fields use absolute positioning and do not allow for relative positioning.
+
<pre>
 
+
TAG_Compound(<nowiki>''</nowiki>): 1 entry
{| class="wikitable"
+
{
  ! Packet ID
+
  TAG_List('pages'): 2 entries
 +
  {
 +
    TAG_String(0): 'Something on Page 1'
 +
    TAG_String(1): 'Something on Page 2'
 +
  }
 +
}
 +
</pre>
 +
 
 +
When signing the book, it instead looks like this:
 +
 
 +
<pre>
 +
TAG_Compound(<nowiki>''</nowiki>): 3 entires
 +
{
 +
  TAG_String('author'): 'Steve'
 +
  TAG_String('title'): 'A Wonderful Book'
 +
  TAG_List('pages'): 2 entries
 +
  {
 +
    TAG_String(0): 'Something on Page 1'
 +
    TAG_String(1): 'Something on Page 2'
 +
  }
 +
}
 +
</pre>
 +
 
 +
==== Interact Entity ====
 +
 
 +
This packet is sent from the client to the server when the client attacks or right-clicks another entity (a player, minecart, etc).
 +
 
 +
A Notchian server only accepts this packet if the entity being attacked/used is visible without obstruction and within a 4-unit radius of the player's position.
 +
 
 +
Note that middle-click in creative mode is interpreted by the client and sent as a [[#Creative Inventory Action|Creative Inventory Action]] packet instead.
 +
 
 +
{| class="wikitable"
 +
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
Line 6,221: Line 6,566:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x15
+
  |rowspan="7"| 0x0E
  |rowspan="5"| Play
+
  |rowspan="7"| Play
  |rowspan="5"| Server
+
  |rowspan="7"| Server
  | X
+
  | Entity ID
  | Double
+
  | VarInt
  | Absolute position (X coordinate)
+
  | The ID of the entity to interact
 
  |-
 
  |-
  | Y
+
  | Type
  | Double
+
  | VarInt Enum
  | Absolute position (Y coordinate)
+
  | 0: interact, 1: attack, 2: interact at
 
  |-
 
  |-
  | Z
+
  | Target X
  | Double
+
  | Optional Float
  | Absolute position (Z coordinate)
+
  | Only if Type is interact at
 
  |-
 
  |-
  | Yaw
+
  | Target Y
  | Float
+
  | Optional Float
  | Absolute rotation on the vertical axis, in degrees
+
  | Only if Type is interact at
 +
|-
 +
| Target Z
 +
| Optional Float
 +
| Only if Type is interact at
 +
|-
 +
| Hand
 +
| Optional VarInt Enum
 +
| Only if Type is interact or interact at; 0: main hand, 1: off hand
 
  |-
 
  |-
  | Pitch
+
  | Sneaking
  | Float
+
  | Boolean
  | Absolute rotation on the horizontal axis, in degrees
+
  | If the client is sneaking.
 
  |}
 
  |}
 +
 +
==== Generate Structure ====
  
==== Steer Boat ====
+
Sent when Generate is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
 
 
Used to ''visually'' update whether boat paddles are turning.  The server will update the [[Entities#Boat|Boat entity metadata]] to match the values here.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,257: Line 6,610:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x16
+
  |rowspan="3"| 0x0F
  |rowspan="2"| Play
+
  |rowspan="3"| Play
  |rowspan="2"| Server
+
  |rowspan="3"| Server
  | Left paddle turning
+
  | Location
  | Boolean
+
  | Position
  |
+
  | Block entity location
 +
|-
 +
| Levels
 +
| VarInt
 +
| Value of the levels slider/max depth to generate
 
  |-
 
  |-
  | Right paddle turning
+
  | Keep Jigsaws
 
  | Boolean
 
  | Boolean
 
  |
 
  |
 
  |}
 
  |}
  
Right paddle turning is set to true when the left button or forward button is held; left paddle turning is set to true when the right button or forward button is set to true.
+
==== Keep Alive (serverbound) ====
 
 
==== Pick Item ====
 
 
 
Used to swap out an empty space on the hotbar with the item in the given inventory slot.  The Notchain client uses this for pick block functionality (middle click) to retrieve items from the inventory.
 
  
 +
The server will frequently send out a keep-alive, each containing a random ID. The client must respond with the same packet.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,284: Line 6,638:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x17
+
  | 0x10
  |rowspan="1"| Play
+
  | Play
  |rowspan="1"| Server
+
  | Server
  | Slot to use
+
  | Keep Alive ID
  | VarInt
+
  | Long
  | See [[Inventory]]
+
  |  
 
  |}
 
  |}
  
The server will first search the player's hotbar for an empty slot, starting from the current slot and looping around to the slot before it.  If there are no empty slots, it will start a second search from the current slot and find the first slot that does not contain an enchanted item.  If there still are no slots that meet that criteria, then the server will use the currently selected slot.
+
==== Lock Difficulty ====
  
After finding the appropriate slot, the server swaps the items and then send 3 packets:
+
Must have at least op level 2 to use. Appears to only be used on singleplayer; the difficulty buttons are still disabled in multiplayer.
 
 
* [[Protocol#Set slot|Set Slot]], with window ID set to -2 and slot set to the newly chosen slot and the item set to the item that is now in that slot (which was previously at the slot the client requested)
 
* Set Slot, with window ID set to -2 and slot set to the slot the player requested, with the item that is now in that slot and was previously on the hotbar slot
 
* [[Protocol#Held_Item_Change_.28clientbound.29|Held Item Change]], with the slot set to the newly chosen slot.
 
 
 
==== Craft Recipe Request ====
 
 
 
This packet is sent when a player clicks a recipe in the crafting book that is craftable (white border).
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,312: Line 6,658:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x18
+
  | 0x11
  |rowspan="3"| Play
+
  | Play
  |rowspan="3"| Server
+
  | Server
  | Window ID
+
  | Locked
  | Byte
+
  | Boolean
 
  |
 
  |
|-
 
| Recipe
 
| Identifier
 
| A recipe ID
 
|-
 
| Make all
 
| Boolean
 
| Affects the amount of items processed; true if shift is down when clicked
 
 
  |}
 
  |}
  
==== Player Abilities (serverbound) ====
+
==== Player Position ====
 +
 
 +
Updates the player's XYZ position on the server.
 +
 
 +
Checking for moving too fast is achieved like this:
 +
 
 +
* Each server tick, the player's current position is stored
 +
* When a player moves, the changes in x, y, and z coordinates are compared with the positions from the previous tick (&Delta;x, &Delta;y, &Delta;z)
 +
* Total movement distance squared is computed as &Delta;x&sup2; + &Delta;y&sup2; + &Delta;z&sup2;
 +
* The expected movement distance squared is computed as velocityX&sup2; + veloctyY&sup2; + velocityZ&sup2;
 +
* If the total movement distance squared value minus the expected movement distance squared value is more than 100 (300 if the player is using an elytra), they are moving too fast.
  
The latter 2 fields are used to indicate the walking and flying speeds respectively, while the first field is used to determine the value of 4 booleans.
+
If the player is moving too fast, it will be logged that "<player> moved too quickly! " followed by the change in x, y, and z, and the player will be teleported back to their current (before this packet) serverside position.
  
The vanilla client sends this packet when the player starts/stops flying with the Flags parameter changed accordingly. All other parameters are ignored by the vanilla server.
+
Also, if the absolute value of X or the absolute value of Z is a value greater than 3.2×10<sup>7</sup>, or X, Y, or Z are not finite (either positive infinity, negative infinity, or NaN), the client will be kicked for “Invalid move player packet received”.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,342: Line 6,690:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x19
+
  |rowspan="4"| 0x12
  |rowspan="3"| Play
+
  |rowspan="4"| Play
  |rowspan="3"| Server
+
  |rowspan="4"| Server
  | Flags
+
  | X
  | Byte
+
  | Double
  | Bit mask. 0x08: damage disabled (god mode), 0x04: can fly, 0x02: is flying, 0x01: is Creative
+
  | Absolute position
 
  |-
 
  |-
  | Flying Speed
+
  | Feet Y
  | Float
+
  | Double
  |  
+
  | Absolute feet position, normally Head Y - 1.62
 
  |-
 
  |-
  | Walking Speed
+
  | Z
  | Float
+
  | Double
  |  
+
  | Absolute position
 +
|-
 +
| On Ground
 +
| Boolean
 +
| True if the client is on the ground, false otherwise
 
  |}
 
  |}
  
==== Player Digging ====
+
==== Player Position And Rotation (serverbound) ====
  
Sent when the player mines a block. A Notchian server only accepts digging packets with coordinates within a 6-unit radius between the center of the block and 1.5 units from the player's feet (''not'' their eyes).
+
A combination of [[#Player Rotation|Player Rotation]] and [[#Player Position|Player Position]].
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,370: Line 6,722:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x1A
+
  |rowspan="6"| 0x13
  |rowspan="3"| Play
+
  |rowspan="6"| Play
  |rowspan="3"| Server
+
  |rowspan="6"| Server
  | Status
+
  | X
  | VarInt Enum
+
  | Double
  | The action the player is taking against the block (see below)
+
  | Absolute position
 +
|-
 +
| Feet Y
 +
| Double
 +
| Absolute feet position, normally Head Y - 1.62
 +
|-
 +
| Z
 +
| Double
 +
| Absolute position
 +
|-
 +
| Yaw
 +
| Float
 +
| Absolute rotation on the X Axis, in degrees
 
  |-
 
  |-
  | Location
+
  | Pitch
  | Position
+
  | Float
  | Block position
+
  | Absolute rotation on the Y Axis, in degrees
 
  |-
 
  |-
  | Face
+
  | On Ground
  | Byte Enum
+
  | Boolean
  | The face being hit (see below)
+
  | True if the client is on the ground, false otherwise
 
  |}
 
  |}
  
Status can be one of seven values:
+
==== Player Rotation ====
 +
[[File:Minecraft-trig-yaw.png|thumb|The unit circle for yaw]]
 +
[[File:Yaw.png|thumb|The unit circle of yaw, redrawn]]
 +
 
 +
Updates the direction the player is looking in.
  
{| class="wikitable"
+
Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0,-1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.
  ! Value
+
 
  ! Meaning
+
Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.
 +
 
 +
The yaw and pitch of player (in degrees), standing at point (x0, y0, z0) and looking towards point (x, y, z) can be calculated with:
 +
 
 +
dx = x-x0
 +
dy = y-y0
 +
dz = z-z0
 +
r = sqrt( dx*dx + dy*dy + dz*dz )
 +
yaw = -atan2(dx,dz)/PI*180
 +
if yaw < 0 then
 +
    yaw = 360 + yaw
 +
pitch = -arcsin(dy/r)/PI*180
 +
 
 +
You can get a unit vector from a given yaw/pitch via:
 +
 
 +
x = -cos(pitch) * sin(yaw)
 +
y = -sin(pitch)
 +
z =  cos(pitch) * cos(yaw)
 +
 
 +
{| class="wikitable"
 +
  ! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | 0
+
  |rowspan="3"| 0x14
  | Started digging
+
|rowspan="3"| Play
  |  
+
|rowspan="3"| Server
 +
| Yaw
 +
  | Float
 +
  | Absolute rotation on the X Axis, in degrees
 
  |-
 
  |-
  | 1
+
  | Pitch
  | Cancelled digging
+
  | Float
  | Sent when the player lets go of the Mine Block key (default: left click)
+
  | Absolute rotation on the Y Axis, in degrees
 
  |-
 
  |-
  | 2
+
  | On Ground
  | Finished digging
+
  | Boolean
  | Sent when the client thinks it is finished
+
  | True if the client is on the ground, False otherwise
|-
+
  |}
| 3
+
 
| Drop item stack
+
==== Player Movement ====
| Triggered by using the Drop Item key (default: Q) with the modifier to drop the entire selected stack (default: depends on OS). Location is always set to 0/0/0, Face is always set to -Y.
 
|-
 
| 4
 
| Drop item
 
| Triggered by using the Drop Item key (default: Q). Location is always set to 0/0/0, Face is always set to -Y.
 
  |-
 
| 5
 
| Shoot arrow / finish eating
 
| Indicates that the currently held item should have its state updated such as eating food, pulling back bows, using buckets, etc. Location is always set to 0/0/0, Face is always set to -Y.
 
|-
 
| 6
 
| Swap item in hand
 
| Used to swap or assign an item to the second hand. Location is always set to 0/0/0, Face is always set to -Y.
 
|}
 
  
The Face field can be one of the following values, representing the face being hit:
+
This packet as well as [[#Player Position|Player Position]], [[#Player Look|Player Look]], and [[#Player Position And Look 2|Player Position And Look]] are called the “serverbound movement packets”. Vanilla clients will send Player Position once every 20 ticks even for a stationary player.
  
{| class="wikitable"
+
This packet is used to indicate whether the player is on ground (walking/swimming), or airborne (jumping/falling).
|-
 
! Value
 
! Offset
 
! Face
 
|-
 
| 0
 
| -Y
 
| Bottom
 
|-
 
| 1
 
| +Y
 
| Top
 
|-
 
| 2
 
| -Z
 
| North
 
|-
 
| 3
 
| +Z
 
| South
 
|-
 
| 4
 
| -X
 
| West
 
|-
 
| 5
 
| +X
 
| East
 
|}
 
  
==== Entity Action ====
+
When dropping from sufficient height, fall damage is applied when this state goes from false to true. The amount of damage applied is based on the point where it last changed from true to false. Note that there are several movement related packets containing this state.
 
 
Sent by the client to indicate that it has performed certain actions: sneaking (crouching), sprinting, exiting a bed, jumping with a horse, and opening a horse's inventory while riding it.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,467: Line 6,817:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x1B
+
  | 0x15
  |rowspan="3"| Play
+
  | Play
  |rowspan="3"| Server
+
  | Server
  | Entity ID
+
  | On Ground
| VarInt
+
  | Boolean
| Player ID
+
  | True if the client is on the ground, false otherwise
|-
 
| Action ID
 
  | VarInt Enum
 
  | The ID of the action, see below
 
|-
 
| Jump Boost
 
| VarInt
 
| Only used by the “start jump with horse” action, in which case it ranges from 0 to 100. In all other cases it is 0.
 
 
  |}
 
  |}
  
Action ID can be one of the following values:
+
==== Vehicle Move (serverbound) ====
 +
 
 +
Sent when a player moves in a vehicle. Fields are the same as in [[#Player Position And Look (serverbound)|Player Position And Look]]. Note that all fields use absolute positioning and do not allow for relative positioning.
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! ID
+
  ! Packet ID
  ! Action
+
  ! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 0
+
  |rowspan="5"| 0x16
  | Start sneaking
+
|rowspan="5"| Play
 +
|rowspan="5"| Server
 +
| X
 +
| Double
 +
  | Absolute position (X coordinate)
 
  |-
 
  |-
  | 1
+
  | Y
  | Stop sneaking
+
  | Double
 +
| Absolute position (Y coordinate)
 
  |-
 
  |-
  | 2
+
  | Z
  | Leave bed
+
  | Double
 +
| Absolute position (Z coordinate)
 
  |-
 
  |-
  | 3
+
  | Yaw
  | Start sprinting
+
  | Float
 +
| Absolute rotation on the vertical axis, in degrees
 
  |-
 
  |-
  | 4
+
  | Pitch
  | Stop sprinting
+
  | Float
  |-
+
  | Absolute rotation on the horizontal axis, in degrees
| 5
 
| Start jump with horse
 
|-
 
| 6
 
| Stop jump with horse
 
|-
 
| 7
 
| Open horse inventory
 
|-
 
| 8
 
| Start flying with elytra
 
 
  |}
 
  |}
  
Leave bed is only sent when the “Leave Bed” button is clicked on the sleep GUI, not when waking up due today time.
+
==== Steer Boat ====
  
Open horse inventory is only sent when pressing the inventory key (default: E) while on a horse — all other methods of opening a horse's inventory (involving right-clicking or shift-right-clicking it) do not use this packet.
+
Used to ''visually'' update whether boat paddles are turning.  The server will update the [[Entities#Boat|Boat entity metadata]] to match the values here.
 
 
==== Steer Vehicle ====
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,531: Line 6,873:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x1C
+
  |rowspan="2"| 0x17
  |rowspan="3"| Play
+
  |rowspan="2"| Play
  |rowspan="3"| Server
+
  |rowspan="2"| Server
  | Sideways
+
  | Left paddle turning
  | Float
+
  | Boolean
  | Positive to the left of the player
+
  |
 
  |-
 
  |-
  | Forward
+
  | Right paddle turning
  | Float
+
  | Boolean
  | Positive forward
+
  |
|-
 
| Flags
 
| Unsigned Byte
 
| Bit mask. 0x1: jump, 0x2: unmount
 
 
  |}
 
  |}
  
Also known as 'Input' packet.
+
Right paddle turning is set to true when the left button or forward button is held; left paddle turning is set to true when the right button or forward button is set to true.
 +
 
 +
==== Pick Item ====
 +
 
 +
Used to swap out an empty space on the hotbar with the item in the given inventory slot.  The Notchain client uses this for pick block functionality (middle click) to retrieve items from the inventory.
  
==== Recipe Book Data ====
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,555: Line 6,896:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="11"| 0x1D
+
  | 0x18
  |rowspan="11"| Play
+
  | Play
  |rowspan="11"| Server
+
  | Server
  |colspan="2"| Type
+
  | Slot to use
 
  | VarInt
 
  | VarInt
  | Determines the format of the rest of the packet
+
  | See [[Inventory]]
|-
 
! Type
 
! Field Name
 
!
 
!
 
|-
 
| 0: Displayed Recipe
 
| Recipe ID
 
| Identifier
 
| A recipe ID
 
|-
 
|rowspan="4"| 1: Recipe Book States
 
| Crafting Recipe Book Open
 
| Boolean
 
| Whether the player has the crafting recipe book currently opened/active.
 
|-
 
| Crafting Recipe Filter Active
 
| Boolean
 
| Whether the player has the crafting recipe book filter option currently active.
 
|-
 
| Smelting Recipe Book Open
 
| Boolean
 
| Whether the player has the smelting recipe book currently opened/active.
 
|-
 
| Smelting Recipe Filter Active
 
| Boolean
 
| Whether the player has the smelting recipe book filter option currently active.
 
|-
 
| Blasting Recipe Book Open
 
| Boolean
 
| May be swapped with smoking recipe book.  Also, the notchian client appears to use the same value for both of those books currently.
 
|-
 
| Blasting Recipe Filter Active
 
| Boolean
 
| May be swapped with smoking recipe book.  Also, the notchian client appears to use the same value for both of those books currently.
 
|-
 
| Smoking Recipe Book Open
 
| Boolean
 
|
 
|-
 
| Smoking Recipe Filter Active
 
| Boolean
 
|
 
 
  |}
 
  |}
  
The Recipe Book Status type is sent when one of the states changes.
+
The server will first search the player's hotbar for an empty slot, starting from the current slot and looping around to the slot before it.  If there are no empty slots, it will start a second search from the current slot and find the first slot that does not contain an enchanted item.  If there still are no slots that meet that criteria, then the server will use the currently selected slot.
  
==== Name Item ====
+
After finding the appropriate slot, the server swaps the items and then send 3 packets:
  
Sent as a player is renaming an item in an anvil (each keypress in the anvil UI sends a new Name Item packet).  If the new name is empty, then the item loses its custom name (this is different from setting the custom name to the normal name of the item). The item name may be no longer than 35 characters long, and if it is longer than that, then the rename is silently ignored.
+
* [[Protocol#Set slot|Set Slot]], with window ID set to -2 and slot set to the newly chosen slot and the item set to the item that is now in that slot (which was previously at the slot the client requested)
 +
* Set Slot, with window ID set to -2 and slot set to the slot the player requested, with the item that is now in that slot and was previously on the hotbar slot
 +
* [[Protocol#Held_Item_Change_.28clientbound.29|Held Item Change]], with the slot set to the newly chosen slot.
  
{| class="wikitable"
+
==== Craft Recipe Request ====
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="1"| 0x1E
 
|rowspan="1"| Play
 
|rowspan="1"| Server
 
| Item name
 
| String (32767)
 
| The new name of the item
 
|}
 
  
==== Resource Pack Status ====
+
This packet is sent when a player clicks a recipe in the crafting book that is craftable (white border).
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,642: Line 6,928:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x1F
+
  |rowspan="3"| 0x19
  |rowspan="1"| Play
+
  |rowspan="3"| Play
  |rowspan="1"| Server
+
  |rowspan="3"| Server
  | Result
+
  | Window ID
| VarInt Enum
+
  | Byte
  | 0: successfully loaded, 1: declined, 2: failed download, 3: accepted
+
  |
  |}
 
 
 
==== Advancement Tab ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x20
+
  | Recipe
|rowspan="2"| Play
+
  | Identifier
|rowspan="2"| Server
+
  | A recipe ID
| Action
 
  | VarInt enum
 
  | 0: Opened tab, 1: Closed screen
 
 
  |-
 
  |-
  | Tab ID
+
  | Make all
  | Optional identifier
+
  | Boolean
  | Only present if action is Opened tab
+
  | Affects the amount of items processed; true if shift is down when clicked
 
  |}
 
  |}
  
==== Select Trade ====
+
==== Player Abilities (serverbound) ====
  
When a player selects a specific trade offered by a villager NPC.
+
The vanilla client sends this packet when the player starts/stops flying with the Flags parameter changed accordingly.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,684: Line 6,956:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x21
+
  | 0x1A
  |rowspan="1"| Play
+
  | Play
  |rowspan="1"| Server
+
  | Server
  | Selected slot
+
  | Flags
  | VarInt
+
  | Byte
  | The selected slot int the players current (trading) inventory. (Was a full Integer for the plugin message)
+
  | Bit mask. 0x02: is flying
 
  |}
 
  |}
  
==== Set Beacon Effect ====
+
==== Player Digging ====
  
Changes the effect of the current beacon.
+
Sent when the player mines a block. A Notchian server only accepts digging packets with coordinates within a 6-unit radius between the center of the block and 1.5 units from the player's feet (''not'' their eyes).
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,704: Line 6,976:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x22
+
  |rowspan="3"| 0x1B
  |rowspan="2"| Play
+
  |rowspan="3"| Play
  |rowspan="2"| Server
+
  |rowspan="3"| Server
  | Primary Effect
+
  | Status
  | VarInt
+
  | VarInt Enum
  | A [http://minecraft.gamepedia.com/Data_values#Potions Potion ID]. (Was a full Integer for the plugin message)
+
  | The action the player is taking against the block (see below)
 
  |-
 
  |-
  | Secondary Effect
+
  | Location
  | VarInt
+
  | Position
  | A [http://minecraft.gamepedia.com/Data_values#Potions Potion ID]. (Was a full Integer for the plugin message)
+
  | Block position
|}
 
 
 
==== Held Item Change (serverbound) ====
 
 
 
Sent when the player changes the slot selection
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="1"| 0x23
+
  | Face
|rowspan="1"| Play
+
  | Byte Enum
|rowspan="1"| Server
+
  | The face being hit (see below)
| Slot
 
  | Short
 
  | The slot which the player has selected (0–8)
 
 
  |}
 
  |}
  
==== Update Command Block ====
+
Status can be one of seven values:
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! Value
  ! State
+
  ! Meaning
! Bound To
 
! Field Name
 
! Field Type
 
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x24
+
  | 0
  |rowspan="5"| Play
+
  | Started digging
  |rowspan="5"| Server
+
  |  
 
  |-
 
  |-
  | Location
+
  | 1
  | Position
+
  | Cancelled digging
  |
+
  | Sent when the player lets go of the Mine Block key (default: left click)
 
  |-
 
  |-
  | Command
+
  | 2
  | String (32767)
+
  | Finished digging
  |
+
| Sent when the client thinks it is finished
 +
|-
 +
| 3
 +
| Drop item stack
 +
| Triggered by using the Drop Item key (default: Q) with the modifier to drop the entire selected stack (default: depends on OS). Location is always set to 0/0/0, Face is always set to -Y.
 +
|-
 +
| 4
 +
  | Drop item
 +
| Triggered by using the Drop Item key (default: Q). Location is always set to 0/0/0, Face is always set to -Y.
 
  |-
 
  |-
  | Mode || VarInt enum || One of SEQUENCE (0), AUTO (1), or REDSTONE (2)
+
  | 5
 +
| Shoot arrow / finish eating
 +
| Indicates that the currently held item should have its state updated such as eating food, pulling back bows, using buckets, etc. Location is always set to 0/0/0, Face is always set to -Y.
 
  |-
 
  |-
  | Flags
+
  | 6
  | Byte
+
  | Swap item in hand
  | 0x01: Track Output (if false, the output of the previous command will not be stored within the command block); 0x02: Is conditional; 0x04: Automatic
+
  | Used to swap or assign an item to the second hand. Location is always set to 0/0/0, Face is always set to -Y.
 
  |}
 
  |}
  
==== Update Command Block Minecart ====
+
The Face field can be one of the following values, representing the face being hit:
  
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x25
+
  ! Value
  |rowspan="3"| Play
+
! Offset
  |rowspan="3"| Server
+
  ! Face
  | Entity ID
+
  |-
  | VarInt
+
  | 0
  |
+
  | -Y
 +
  | Bottom
 
  |-
 
  |-
  | Command
+
  | 1
  | String
+
  | +Y
  |
+
  | Top
 
  |-
 
  |-
  | Track Output
+
  | 2
  | Boolean
+
  | -Z
  | If false, the output of the previous command will not be stored within the command block.
+
  | North
  |}
+
  |-
 
+
| 3
==== Creative Inventory Action ====
+
| +Z
 +
| South
 +
|-
 +
| 4
 +
| -X
 +
| West
 +
|-
 +
| 5
 +
| +X
 +
| East
 +
|}
  
While the user is in the standard inventory (i.e., not a crafting bench) in Creative mode, the player will send this packet.
+
==== Entity Action ====
  
Clicking in the creative inventory menu is quite different from non-creative inventory management. Picking up an item with the mouse actually deletes the item from the server, and placing an item into a slot or dropping it out of the inventory actually tells the server to create the item from scratch. (This can be verified by clicking an item that you don't mind deleting, then severing the connection to the server; the item will be nowhere to be found when you log back in.) As a result of this implementation strategy, the "Destroy Item" slot is just a client-side implementation detail that means "I don't intend to recreate this item.". Additionally, the long listings of items (by category, etc.) are a client-side interface for choosing which item to create. Picking up an item from such listings sends no packets to the server; only when you put it somewhere does it tell the server to create the item in that location.
+
Sent by the client to indicate that it has performed certain actions: sneaking (crouching), sprinting, exiting a bed, jumping with a horse, and opening a horse's inventory while riding it.
 
 
This action can be described as "set inventory slot". Picking up an item sets the slot to item ID -1. Placing an item into an inventory slot sets the slot to the specified item. Dropping an item (by clicking outside the window) effectively sets slot -1 to the specified item, which causes the server to spawn the item entity, etc.. All other inventory slots are numbered the same as the non-creative inventory (including slots for the 2x2 crafting menu, even though they aren't visible in the vanilla client).
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,807: Line 7,073:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x26
+
  |rowspan="3"| 0x1C
  |rowspan="2"| Play
+
  |rowspan="3"| Play
  |rowspan="2"| Server
+
  |rowspan="3"| Server
  | Slot
+
  | Entity ID
  | Short
+
  | VarInt
  | Inventory slot
+
  | Player ID
 +
|-
 +
| Action ID
 +
| VarInt Enum
 +
| The ID of the action, see below
 
  |-
 
  |-
  | Clicked Item
+
  | Jump Boost
  | [[Slot Data|Slot]]
+
  | VarInt
  |  
+
  | Only used by the “start jump with horse” action, in which case it ranges from 0 to 100. In all other cases it is 0.
 
  |}
 
  |}
  
==== Update Jigsaw Block ====
+
Action ID can be one of the following values:
 
 
Sent when Done is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! ID
  ! State
+
  ! Action
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="4"| 0x27
+
  | 0
  |rowspan="4"| Play
+
| Start sneaking
  |rowspan="4"| Server
+
|-
  | Location
+
| 1
  | Position
+
| Stop sneaking
  | Block entity location
+
|-
 +
| 2
 +
| Leave bed
 +
|-
 +
| 3
 +
| Start sprinting
 +
|-
 +
  | 4
 +
| Stop sprinting
 +
|-
 +
  | 5
 +
| Start jump with horse
 +
  |-
 +
  | 6
 +
  | Stop jump with horse
 
  |-
 
  |-
  | Attachment type
+
  | 7
| Identifier
+
  | Open horse inventory
|
 
|-
 
| Target pool
 
| Identifier
 
  |  
 
 
  |-
 
  |-
  | Final state
+
  | 8
  | String
+
  | Start flying with elytra
| "Turns into" on the GUI, <code>final_state</code> in NBT
 
 
  |}
 
  |}
  
==== Update Structure Block ====
+
Leave bed is only sent when the “Leave Bed” button is clicked on the sleep GUI, not when waking up due today time.
 +
 
 +
Open horse inventory is only sent when pressing the inventory key (default: E) while on a horse — all other methods of opening a horse's inventory (involving right-clicking or shift-right-clicking it) do not use this packet.
 +
 
 +
==== Steer Vehicle ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,861: Line 7,137:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="17"| 0x28
+
  |rowspan="3"| 0x1D
  |rowspan="17"| Play
+
  |rowspan="3"| Play
  |rowspan="17"| Server
+
  |rowspan="3"| Server
 +
| Sideways
 +
| Float
 +
| Positive to the left of the player
 
  |-
 
  |-
  | Location
+
  | Forward
  | Position
+
  | Float
  | Block entity location
+
  | Positive forward
 +
|-
 +
| Flags
 +
| Unsigned Byte
 +
| Bit mask. 0x1: jump, 0x2: unmount
 +
|}
 +
 
 +
Also known as 'Input' packet.
 +
 
 +
==== Set Displayed Recipe ====
 +
 
 +
Replaces Recipe Book Data, type 0.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | Action
+
  | 0x1E
  | VarInt enum
+
  | Play
  | An additional action to perform beyond simply saving the given data; see below
+
  | Server
 +
| Recipe ID
 +
| Identifier
 +
|
 +
|}
 +
 
 +
==== Set Recipe Book State ====
 +
 
 +
Replaces Recipe Book Data, type 1.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | Mode
+
  |rowspan="3"| 0x1F
 +
|rowspan="3"| Play
 +
|rowspan="3"| Server
 +
| Book ID
 
  | VarInt enum
 
  | VarInt enum
  | One of SAVE (0), LOAD (1), CORNER (2), DATA (3).
+
  | 0: crafting, 1: furnace, 2: blast furnace, 3: smoker
 
  |-
 
  |-
  | Name
+
  | Book Open
  | String
+
  | Boolean
 
  |
 
  |
 
  |-
 
  |-
  | Offset X || Byte
+
  | Filter Active
  | Between -32 and 32
+
  | Boolean
  |-
+
  |
  | Offset Y || Byte
+
  |}
| Between -32 and 32
+
 
|-
+
==== Name Item ====
| Offset Z || Byte
 
| Between -32 and 32
 
|-
 
| Size X || Byte
 
| Between 0 and 32
 
|-
 
| Size Y || Byte
 
| Between 0 and 32
 
|-
 
| Size Z || Byte
 
| Between 0 and 32
 
|-
 
| Mirror
 
| VarInt enum
 
| One of NONE (0), LEFT_RIGHT (1), FRONT_BACK (2).
 
|-
 
| Rotation
 
| VarInt enum
 
| One of NONE (0), CLOCKWISE_90 (1), CLOCKWISE_180 (2), COUNTERCLOCKWISE_90 (3).
 
|-
 
| Metadata
 
| String
 
|
 
|-
 
| Integrity
 
| Float
 
| Between 0 and 1
 
|-
 
|Seed
 
|VarLong
 
|
 
|-
 
| Flags
 
| Byte
 
| 0x01: Ignore entities; 0x02: Show air; 0x04: Show bounding box
 
|}
 
  
Possible actions:
+
Sent as a player is renaming an item in an anvil (each keypress in the anvil UI sends a new Name Item packet). If the new name is empty, then the item loses its custom name (this is different from setting the custom name to the normal name of the item). The item name may be no longer than 35 characters long, and if it is longer than that, then the rename is silently ignored.
 
 
* 0 - Update data
 
* 1 - Save the structure
 
* 2 - Load the structure
 
* 3 - Detect size
 
 
 
The Notchian client uses update data to indicate no special action should be taken (i.e. the done button).
 
 
 
==== Update Sign ====
 
 
 
{{anchor|Update Sign (serverbound)}}This message is sent from the client to the server when the “Done” button is pushed after placing a sign.
 
 
 
The server only accepts this packet after [[#Open Sign Editor|Open Sign Editor]], otherwise this packet is silently ignored.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,947: Line 7,215:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x29
+
  | 0x20
  |rowspan="5"| Play
+
  | Play
  |rowspan="5"| Server
+
  | Server
  | Location
+
  | Item name
| Position
+
  | String (32767)
| Block Coordinates
+
  | The new name of the item
|-
 
| Line 1
 
| String (384)
 
| First line of text in the sign
 
|-
 
| Line 2
 
| String (384)
 
| Second line of text in the sign
 
|-
 
| Line 3
 
| String (384)
 
| Third line of text in the sign
 
|-
 
| Line 4
 
  | String (384)
 
  | Fourth line of text in the sign
 
 
  |}
 
  |}
  
==== Animation (serverbound) ====
+
==== Resource Pack Status ====
 
 
Sent when the player's arm swings.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 6,983: Line 7,233:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | 0x2A
+
  | 0x21
 
  | Play
 
  | Play
 
  | Server
 
  | Server
  | Hand
+
  | Result
 
  | VarInt Enum
 
  | VarInt Enum
  | Hand used for the animation. 0: main hand, 1: off hand.
+
  | 0: successfully loaded, 1: declined, 2: failed download, 3: accepted
 
  |}
 
  |}
  
==== Spectate ====
+
==== Advancement Tab ====
 
 
Teleports the player to the given entity.  The player must be in spectator mode.
 
 
 
The Notchian client only uses this to teleport to players, but it appears to accept any type of entity.  The entity does not need to be in the same dimension as the player; if necessary, the player will be respawned in the right world.  If the given entity cannot be found (or isn't loaded), this packet will be ignored.  It will also be ignored if the player attempts to teleport to themselves.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 7,005: Line 7,251:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x2B
+
  |rowspan="2"| 0x22
  |rowspan="1"| Play
+
  |rowspan="2"| Play
  |rowspan="1"| Server
+
  |rowspan="2"| Server
  | Target Player
+
  | Action
  | UUID
+
| VarInt enum
  | UUID of the player to teleport to (can also be an entity UUID)
+
| 0: Opened tab, 1: Closed screen
 +
|-
 +
| Tab ID
 +
  | Optional identifier
 +
  | Only present if action is Opened tab
 
  |}
 
  |}
  
==== Player Block Placement ====
+
==== Select Trade ====
 +
 
 +
When a player selects a specific trade offered by a villager NPC.
  
 
{| class="wikitable"
 
{| class="wikitable"
|-
 
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 7,024: Line 7,275:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="7"| 0x2C
+
  | 0x23
  |rowspan="7"| Play
+
  | Play
  |rowspan="7"| Server
+
  | Server
  | Hand
+
  | Selected slot
  | VarInt Enum
+
  | VarInt
  | The hand from which the block is placed; 0: main hand, 1: off hand
+
  | The selected slot int the players current (trading) inventory. (Was a full Integer for the plugin message)
|-
 
| Location
 
| Position
 
| Block position
 
|-
 
| Face
 
| VarInt Enum
 
| The face on which the block is placed (as documented at [[#Player Digging|Player Digging]])
 
|-
 
| Cursor Position X
 
| Float
 
| The position of the crosshair on the block, from 0 to 1 increasing from west to east
 
|-
 
| Cursor Position Y
 
| Float
 
| The position of the crosshair on the block, from 0 to 1 increasing from bottom to top
 
|-
 
| Cursor Position Z
 
| Float
 
| The position of the crosshair on the block, from 0 to 1 increasing from north to south
 
|-
 
| Inside block
 
| Boolean
 
| True when the player's head is inside of a block.
 
 
  |}
 
  |}
  
Upon placing a block, this packet is sent once.
+
==== Set Beacon Effect ====
  
The Cursor Position X/Y/Z fields (also known as in-block coordinates) are calculated using raytracing. The unit corresponds to sixteen pixels in the default resource pack. For example, let's say a slab is being placed against the south face of a full block. The Cursor Position X will be higher if the player was pointing near the right (east) edge of the face, lower if pointing near the left. The Cursor Position Y will be used to determine whether it will appear as a bottom slab (values 0.0–0.5) or as a top slab (values 0.5-1.0). The Cursor Position Z should be 1.0 since the player was looking at the southernmost part of the block.
+
Changes the effect of the current beacon.
 
 
Inside block is true when a player's head (specifically eyes) are inside of a block's collision. In 1.13 and later versions, collision is rather complicated and individual blocks can have multiple collision boxes. For instance, a ring of vines has a non-colliding hole in the middle. This value is only true when the player is directly in the box. In practice, though, this value is only used by scaffolding to place in front of the player when sneaking inside of it (other blocks will place behind when you intersect with them -- try with glass for instance).
 
 
 
==== Use Item ====
 
 
 
Sent when pressing the Use Item key (default: right click) with an item in hand.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 7,074: Line 7,295:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | 0x2D
+
  |rowspan="2"| 0x24
  | Play
+
  |rowspan="2"| Play
  | Server
+
  |rowspan="2"| Server
  | Hand
+
  | Primary Effect
  | VarInt Enum
+
  | VarInt
  | Hand used for the animation. 0: main hand, 1: off hand.
+
  | A [http://minecraft.gamepedia.com/Data_values#Potions Potion ID]. (Was a full Integer for the plugin message)
 +
|-
 +
| Secondary Effect
 +
| VarInt
 +
| A [http://minecraft.gamepedia.com/Data_values#Potions Potion ID]. (Was a full Integer for the plugin message)
 
  |}
 
  |}
  
== Status ==
+
==== Held Item Change (serverbound) ====
{{Main|Server List Ping}}
 
  
=== Clientbound ===
+
Sent when the player changes the slot selection
 
 
==== Response ====
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 7,097: Line 7,319:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x00
+
  | 0x25
  |rowspan="1"| Status
+
| Play
  |rowspan="1"| Client
+
  | Server
  | JSON Response
+
  | Slot
  | String (32767)
+
  | Short
| See [[Server List Ping#Response]]
+
  | The slot which the player has selected (0–8)
 
  |}
 
  |}
  
==== Pong ====
+
==== Update Command Block ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 7,115: Line 7,337:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x01
+
  |rowspan="5"| 0x26
  |rowspan="1"| Status
+
  |rowspan="5"| Play
  |rowspan="1"| Client
+
  |rowspan="5"| Server
  | Payload
+
|-
  | Long
+
| Location
  | Should be the same as sent by the client
+
| Position
 +
|
 +
|-
 +
| Command
 +
| String (32767)
 +
|
 +
|-
 +
| Mode || VarInt enum || One of SEQUENCE (0), AUTO (1), or REDSTONE (2)
 +
|-
 +
  | Flags
 +
  | Byte
 +
  | 0x01: Track Output (if false, the output of the previous command will not be stored within the command block); 0x02: Is conditional; 0x04: Automatic
 
  |}
 
  |}
  
=== Serverbound ===
+
==== Update Command Block Minecart ====
 
 
==== Request ====
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 7,135: Line 7,366:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x00
+
  |rowspan="3"| 0x27
  | Status
+
  |rowspan="3"| Play
| Server
+
  |rowspan="3"| Server
  |colspan="3"| ''no fields''
+
| Entity ID
 +
| VarInt
 +
|
 +
|-
 +
| Command
 +
| String
 +
|
 +
|-
 +
| Track Output
 +
| Boolean
 +
| If false, the output of the previous command will not be stored within the command block.
 
  |}
 
  |}
  
==== Ping ====
+
==== Creative Inventory Action ====
 +
 
 +
While the user is in the standard inventory (i.e., not a crafting bench) in Creative mode, the player will send this packet.
 +
 
 +
Clicking in the creative inventory menu is quite different from non-creative inventory management. Picking up an item with the mouse actually deletes the item from the server, and placing an item into a slot or dropping it out of the inventory actually tells the server to create the item from scratch. (This can be verified by clicking an item that you don't mind deleting, then severing the connection to the server; the item will be nowhere to be found when you log back in.) As a result of this implementation strategy, the "Destroy Item" slot is just a client-side implementation detail that means "I don't intend to recreate this item.". Additionally, the long listings of items (by category, etc.) are a client-side interface for choosing which item to create. Picking up an item from such listings sends no packets to the server; only when you put it somewhere does it tell the server to create the item in that location.
 +
 
 +
This action can be described as "set inventory slot". Picking up an item sets the slot to item ID -1. Placing an item into an inventory slot sets the slot to the specified item. Dropping an item (by clicking outside the window) effectively sets slot -1 to the specified item, which causes the server to spawn the item entity, etc.. All other inventory slots are numbered the same as the non-creative inventory (including slots for the 2x2 crafting menu, even though they aren't visible in the vanilla client).
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 7,151: Line 7,398:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x01
+
  |rowspan="2"| 0x29
  |rowspan="1"| Status
+
  |rowspan="2"| Play
  |rowspan="1"| Server
+
  |rowspan="2"| Server
  | Payload
+
  | Slot
  | Long
+
  | Short
  | May be any number. Notchian clients use a system-dependent time value which is counted in milliseconds.
+
| Inventory slot
 +
  |-
 +
| Clicked Item
 +
| [[Slot Data|Slot]]
 +
|
 
  |}
 
  |}
  
== Login ==
+
==== Update Jigsaw Block ====
  
The login process is as follows:
+
Sent when Done is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
 
 
# C→S: [[#Handshake|Handshake]] with Next State set to 2 (login)
 
# C→S: [[#Login Start|Login Start]]
 
# S→C: [[#Encryption Request|Encryption Request]]
 
# Client auth
 
# C→S: [[#Encryption Response|Encryption Response]]
 
# Server auth, both enable encryption
 
# S→C: [[#Set Compression|Set Compression]] (optional)
 
# S→C: [[#Login Success|Login Success]]
 
 
 
Set Compression, if present, must be sent before Login Success. Note that anything sent after Set Compression must use the [[#With_compression|Post Compression packet format]].
 
 
 
For unauthenticated and localhost connections (either of the two conditions is enough for an unencrypted connection) there is no encryption. In that case [[#Login Start|Login Start]] is directly followed by [[#Login Success|Login Success]].
 
 
 
See [[Protocol Encryption]] for details.
 
 
 
=== Clientbound ===
 
 
 
==== Disconnect (login) ====
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 7,190: Line 7,422:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x00
+
  |rowspan="6"| 0x28
  |rowspan="1"| Login
+
  |rowspan="6"| Play
  |rowspan="1"| Client
+
  |rowspan="6"| Server
  | Reason
+
  | Location
  | [[Chat]]
+
  | Position
 +
| Block entity location
 +
|-
 +
| Name
 +
| Identifier
 +
|
 +
|-
 +
| Target
 +
| Identifier
 +
|
 +
|-
 +
| Pool
 +
| Identifier
 
  |  
 
  |  
 +
|-
 +
| Final state
 +
| String
 +
| "Turns into" on the GUI, <code>final_state</code> in NBT
 +
|-
 +
| Joint type
 +
| String
 +
| <code>rollable</code> if the attached piece can be rotated, else <code>aligned</code>
 
  |}
 
  |}
  
==== Encryption Request ====
+
==== Update Structure Block ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 7,208: Line 7,460:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x01
+
  |rowspan="17"| 0x2A
  |rowspan="5"| Login
+
  |rowspan="17"| Play
  |rowspan="5"| Client
+
  |rowspan="17"| Server
| Server ID
 
| String (20)
 
| Appears to be empty
 
 
  |-
 
  |-
  | Public Key Length
+
  | Location
  | VarInt
+
  | Position
  | Length of Public Key
+
  | Block entity location
 
  |-
 
  |-
  | Public Key
+
  | Action
  | Byte Array
+
  | VarInt enum
  |  
+
  | An additional action to perform beyond simply saving the given data; see below
 
  |-
 
  |-
  | Verify Token Length
+
  | Mode
  | VarInt
+
  | VarInt enum
  | Length of Verify Token. Always 4 for Notchian servers.
+
  | One of SAVE (0), LOAD (1), CORNER (2), DATA (3).
 
  |-
 
  |-
  | Verify Token
+
  | Name
  | Byte Array
+
  | String
  | A sequence of random bytes generated by the server
+
  |
  |}
+
  |-
 
+
| Offset X || Byte
See [[Protocol Encryption]] for details.
+
| Between -32 and 32
 
+
|-
==== Login Success ====
+
| Offset Y || Byte
 
+
| Between -32 and 32
{| class="wikitable"
+
  |-
  ! Packet ID
+
  | Offset Z || Byte
  ! State
+
  | Between -32 and 32
  ! Bound To
+
  |-
  ! Field Name
+
  | Size X || Byte
  ! Field Type
+
  | Between 0 and 32
  ! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x02
+
  | Size Y || Byte
|rowspan="2"| Login
+
  | Between 0 and 32
|rowspan="2"| Client
 
| UUID
 
| String (36)
 
  | Unlike in other packets, this field contains the UUID as a string with hyphens.
 
 
  |-
 
  |-
  | Username
+
  | Size Z || Byte
| String (16)
+
  | Between 0 and 32
|
 
|}
 
 
 
This packet switches the connection state to [[#Play|play]].
 
 
 
==== Set Compression ====
 
 
 
Enables compression.  If compression is enabled, all following packets are encoded in the [[#With compression|compressed packet format]]. Negative values will disable compression, meaning the packet format should remain in the [[#Without compression|uncompressed packet format]].  However, this packet is entirely optional, and if not sent, compression will also not be enabled (the notchian server does not send the packet when compression is disabled).
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="1"| 0x03
+
  | Mirror
  |rowspan="1"| Login
+
| VarInt enum
  |rowspan="1"| Client
+
| One of NONE (0), LEFT_RIGHT (1), FRONT_BACK (2).
  | Threshold
+
|-
  | VarInt
+
  | Rotation
  | Maximum size of a packet before it is compressed
+
| VarInt enum
 +
| One of NONE (0), CLOCKWISE_90 (1), CLOCKWISE_180 (2), COUNTERCLOCKWISE_90 (3).
 +
|-
 +
| Metadata
 +
| String
 +
|
 +
|-
 +
| Integrity
 +
| Float
 +
  | Between 0 and 1
 +
|-
 +
  |Seed
 +
  |VarLong
 +
|
 +
|-
 +
| Flags
 +
| Byte
 +
  | 0x01: Ignore entities; 0x02: Show air; 0x04: Show bounding box
 
  |}
 
  |}
  
==== Login Plugin Request ====
+
Possible actions:
 +
 
 +
* 0 - Update data
 +
* 1 - Save the structure
 +
* 2 - Load the structure
 +
* 3 - Detect size
 +
 
 +
The Notchian client uses update data to indicate no special action should be taken (i.e. the done button).
 +
 
 +
==== Update Sign ====
  
Used to implement a custom handshaking flow together with [[#Login_Plugin_Response | Login Plugin Response]].
+
{{anchor|Update Sign (serverbound)}}This message is sent from the client to the server when the “Done” button is pushed after placing a sign.
  
Unlike plugin messages in "play" mode, these messages follow a lock-step request/response scheme, where the client is expected to respond to a request indicating whether it understood. The notchian client always responds that it hasn't understood, and sends an empty payload.
+
The server only accepts this packet after [[#Open Sign Editor|Open Sign Editor]], otherwise this packet is silently ignored.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 7,292: Line 7,546:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x04
+
  |rowspan="5"| 0x2B
  |rowspan="3"| Login
+
  |rowspan="5"| Play
  |rowspan="3"| Client
+
  |rowspan="5"| Server
  | Message ID
+
  | Location
  | VarInt
+
  | Position
  | Generated by the server - should be unique to the connection.
+
  | Block Coordinates
 
  |-
 
  |-
  | Channel
+
  | Line 1
  | Identifier
+
  | String (384)
  | Name of the [[plugin channel]] used to send the data
+
  | First line of text in the sign
 +
|-
 +
| Line 2
 +
| String (384)
 +
| Second line of text in the sign
 +
|-
 +
| Line 3
 +
| String (384)
 +
| Third line of text in the sign
 
  |-
 
  |-
  | Data
+
  | Line 4
  | Byte Array
+
  | String (384)
  | Any data, depending on the channel. The length of this array must be inferred from the packet length.
+
  | Fourth line of text in the sign
 
  |}
 
  |}
  
=== Serverbound ===
+
==== Animation (serverbound) ====
  
==== Login Start  ====
+
Sent when the player's arm swings.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 7,320: Line 7,582:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x00
+
  | 0x2C
  |rowspan="1"| Login
+
  | Play
  |rowspan="1"| Server
+
  | Server
  | Name
+
  | Hand
  | String (16)
+
  | VarInt Enum
  | Player's Username
+
  | Hand used for the animation. 0: main hand, 1: off hand.
 
  |}
 
  |}
  
==== Encryption Response ====
+
==== Spectate ====
 +
 
 +
Teleports the player to the given entity.  The player must be in spectator mode.
 +
 
 +
The Notchian client only uses this to teleport to players, but it appears to accept any type of entity.  The entity does not need to be in the same dimension as the player; if necessary, the player will be respawned in the right world.  If the given entity cannot be found (or isn't loaded), this packet will be ignored.  It will also be ignored if the player attempts to teleport to themselves.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 7,338: Line 7,604:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x01
+
  | 0x2D
  |rowspan="4"| Login
+
  | Play
  |rowspan="4"| Server
+
  | Server
  | Shared Secret Length
+
  | Target Player
  | VarInt
+
  | UUID
  | Length of Shared Secret
+
  | UUID of the player to teleport to (can also be an entity UUID)
 +
|}
 +
 
 +
==== Player Block Placement ====
 +
 
 +
{| class="wikitable"
 
  |-
 
  |-
  | Shared Secret
+
! Packet ID
  | Byte Array
+
! State
  |  
+
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="7"| 0x2E
 +
|rowspan="7"| Play
 +
|rowspan="7"| Server
 +
| Hand
 +
| VarInt Enum
 +
| The hand from which the block is placed; 0: main hand, 1: off hand
 +
|-
 +
| Location
 +
| Position
 +
| Block position
 +
|-
 +
| Face
 +
| VarInt Enum
 +
| The face on which the block is placed (as documented at [[#Player Digging|Player Digging]])
 +
|-
 +
| Cursor Position X
 +
| Float
 +
| The position of the crosshair on the block, from 0 to 1 increasing from west to east
 +
|-
 +
  | Cursor Position Y
 +
  | Float
 +
  | The position of the crosshair on the block, from 0 to 1 increasing from bottom to top
 
  |-
 
  |-
  | Verify Token Length
+
  | Cursor Position Z
  | VarInt
+
  | Float
  | Length of Verify Token
+
  | The position of the crosshair on the block, from 0 to 1 increasing from north to south
 
  |-
 
  |-
  | Verify Token
+
  | Inside block
  | Byte Array
+
  | Boolean
  |  
+
  | True when the player's head is inside of a block.
 
  |}
 
  |}
  
See [[Protocol Encryption]] for details.
+
Upon placing a block, this packet is sent once.
 +
 
 +
The Cursor Position X/Y/Z fields (also known as in-block coordinates) are calculated using raytracing. The unit corresponds to sixteen pixels in the default resource pack. For example, let's say a slab is being placed against the south face of a full block. The Cursor Position X will be higher if the player was pointing near the right (east) edge of the face, lower if pointing near the left. The Cursor Position Y will be used to determine whether it will appear as a bottom slab (values 0.0–0.5) or as a top slab (values 0.5-1.0). The Cursor Position Z should be 1.0 since the player was looking at the southernmost part of the block.
 +
 
 +
Inside block is true when a player's head (specifically eyes) are inside of a block's collision. In 1.13 and later versions, collision is rather complicated and individual blocks can have multiple collision boxes. For instance, a ring of vines has a non-colliding hole in the middle. This value is only true when the player is directly in the box. In practice, though, this value is only used by scaffolding to place in front of the player when sneaking inside of it (other blocks will place behind when you intersect with them -- try with glass for instance).  
 +
 
 +
==== Use Item ====
  
==== Login Plugin Response ====
+
Sent when pressing the Use Item key (default: right click) with an item in hand.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 7,370: Line 7,673:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x02
+
  | 0x2F
  |rowspan="3"| Login
+
  | Play
  |rowspan="3"| Server
+
  | Server
  | Message ID
+
  | Hand
  | VarInt
+
  | VarInt Enum
  | Should match ID from server.
+
  | Hand used for the animation. 0: main hand, 1: off hand.
|-
 
| Successful
 
| Boolean
 
| <code>true</code> if the client understands the request, <code>false</code> otherwise. When <code>false</code>, no payload follows.
 
|-
 
| Data
 
| Optional Byte Array
 
| Any data, depending on the channel. The length of this array must be inferred from the packet length.
 
 
  |}
 
  |}
  
 
[[Category:Protocol Details]]
 
[[Category:Protocol Details]]
 
[[Category:Minecraft Modern]]
 
[[Category:Minecraft Modern]]

Revision as of 11:33, 18 October 2020

Heads up!

This article is about the protocol for the latest stable release of Minecraft Java Edition (1.16.3, protocol 753). For the Java Edition pre-releases, see Pre-release protocol. For the incomplete Bedrock Edition docs, see Bedrock Protocol. For the old Pocket Edition, see Pocket Edition Protocol Documentation.

This page presents a dissection of the current Minecraft protocol.

If you're having trouble, check out the FAQ or ask for help in the IRC channel #mcdevs on chat.freenode.net (More Information).

Note: While you may use the contents of this page without restriction to create servers, clients, bots, etc… you still need to provide attribution to #mcdevs if you copy any of the contents of this page for publication elsewhere.

The changes between versions may be viewed at Protocol History.

Contents

Definitions

The Minecraft server accepts connections from TCP clients and communicates with them using packets. A packet is a sequence of bytes sent over the TCP connection. The meaning of a packet depends both on its packet ID and the current state of the connection. The initial state of each connection is Handshaking, and state is switched using the packets Handshake and Login Success.

Data types

All data sent over the network (except for VarInt and VarLong) is big-endian, that is the bytes are sent from most significant byte to least significant byte. The majority of everyday computers are little-endian, therefore it may be necessary to change the endianness before sending data over the network.


Name Size (bytes) Encodes Notes
Boolean 1 Either false or true True is encoded as 0x01, false as 0x00.
Byte 1 An integer between -128 and 127 Signed 8-bit integer, two's complement
Unsigned Byte 1 An integer between 0 and 255 Unsigned 8-bit integer
Short 2 An integer between -32768 and 32767 Signed 16-bit integer, two's complement
Unsigned Short 2 An integer between 0 and 65535 Unsigned 16-bit integer
Int 4 An integer between -2147483648 and 2147483647 Signed 32-bit integer, two's complement
Long 8 An integer between -9223372036854775808 and 9223372036854775807 Signed 64-bit integer, two's complement
Float 4 A single-precision 32-bit IEEE 754 floating point number
Double 8 A double-precision 64-bit IEEE 754 floating point number
String (n) ≥ 1
≤ (n×3) + 3
A sequence of Unicode scalar values UTF-8 string prefixed with its size in bytes as a VarInt. Maximum length of n characters, which varies by context. The encoding used on the wire is regular UTF-8, not Java's "slight modification". However, the length of the string for purposes of the length limit is its number of UTF-16 code units, that is, scalar values > U+FFFF are counted as two. Up to n × 3 bytes can be used to encode a UTF-8 string comprising n code units when converted to UTF-16, and both of those limits are checked. Maximum n value is 32767. The + 3 is due to the max size of a valid length VarInt.
Text Component Varies See Text formatting#Text components Encoded as a NBT Tag, with the type of tag used depending on the case:
  • As a String Tag: For components only containing text (no styling, no events etc.).
  • As a Compound Tag: Every other case.
JSON Text Component ≥ 1
≤ (262144×3) + 3
See Text formatting#Text components Encoded as a String with max length of 262144.
Identifier ≥ 1
≤ (32767×3) + 3
See Identifier below Encoded as a String with max length of 32767.
VarInt ≥ 1
≤ 5
An integer between -2147483648 and 2147483647 Variable-length data encoding a two's complement signed 32-bit integer; more info in their section
VarLong ≥ 1
≤ 10
An integer between -9223372036854775808 and 9223372036854775807 Variable-length data encoding a two's complement signed 64-bit integer; more info in their section
Entity Metadata Varies Miscellaneous information about an entity See Entity_metadata#Entity Metadata Format
Slot Varies An item stack in an inventory or container See Slot Data
NBT Varies Depends on context See NBT
Position 8 An integer/block position: x (-33554432 to 33554431), z (-33554432 to 33554431), y (-2048 to 2047) x as a 26-bit integer, followed by z as a 26-bit integer, followed by y as a 12-bit integer (all signed, two's complement). See also the section below.
Angle 1 A rotation angle in steps of 1/256 of a full turn Whether or not this is signed does not matter, since the resulting angles are the same.
UUID 16 A UUID Encoded as an unsigned 128-bit integer (or two unsigned 64-bit integers: the most significant 64 bits and then the least significant 64 bits)
BitSet Varies See #BitSet below A length-prefixed bit set.
Fixed BitSet (n) n See #Fixed BitSet below A bit set with a fixed length of n bits.
Optional X 0 or size of X A field of type X, or nothing Whether or not the field is present must be known from the context.
Array of X count times size of X Zero or more fields of type X The count must be known from the context.
X Enum size of X A specific value from a given list The list of possible values and how each is encoded as an X must be known from the context. An invalid value sent by either side will usually result in the client being disconnected with an error or even crashing.
Byte Array Varies Depends on context This is just a sequence of zero or more bytes, its meaning should be explained somewhere else, e.g. in the packet description. The length must also be known from the context.

Identifier

Identifiers are a namespaced location, in the form of minecraft:thing. If the namespace is not provided, it defaults to minecraft (i.e. thing is minecraft:thing). Custom content should always be in its own namespace, not the default one. Both the namespace and value can use all lowercase alphanumeric characters (a-z and 0-9), dot (.), dash (-), and underscore (_). In addition, values can use slash (/). The naming convention is lower_case_with_underscores. More information. For ease of determining whether a namespace or value is valid, here are regular expressions for each:

  • Namespace: [a-z0-9.-_]
  • Value: [a-z0-9.-_/]

VarInt and VarLong

Variable-length format such that smaller numbers use fewer bytes. These are very similar to Protocol Buffer Varints: the 7 least significant bits are used to encode the value and the most significant bit indicates whether there's another byte after it for the next part of the number. The least significant group is written first, followed by each of the more significant groups; thus, VarInts are effectively little endian (however, groups are 7 bits, not 8).

VarInts are never longer than 5 bytes, and VarLongs are never longer than 10 bytes. Within these limits, unnecessarily long encodings (e.g. 81 00 to encode 1) are allowed.

Pseudocode to read and write VarInts and VarLongs:

private static final int SEGMENT_BITS = 0x7F;
private static final int CONTINUE_BIT = 0x80;
public int readVarInt() {
    int value = 0;
    int position = 0;
    byte currentByte;

    while (true) {
        currentByte = readByte();
        value |= (currentByte & SEGMENT_BITS) << position;

        if ((currentByte & CONTINUE_BIT) == 0) break;

        position += 7;

        if (position >= 32) throw new RuntimeException("VarInt is too big");
    }

    return value;
}
public long readVarLong() {
    long value = 0;
    int position = 0;
    byte currentByte;

    while (true) {
        currentByte = readByte();
        value |= (long) (currentByte & SEGMENT_BITS) << position;

        if ((currentByte & CONTINUE_BIT) == 0) break;

        position += 7;

        if (position >= 64) throw new RuntimeException("VarLong is too big");
    }

    return value;
}
public void writeVarInt(int value) {
    while (true) {
        if ((value & ~SEGMENT_BITS) == 0) {
            writeByte(value);
            return;
        }

        writeByte((value & SEGMENT_BITS) | CONTINUE_BIT);

        // Note: >>> means that the sign bit is shifted with the rest of the number rather than being left alone
        value >>>= 7;
    }
}
public void writeVarLong(long value) {
    while (true) {
        if ((value & ~((long) SEGMENT_BITS)) == 0) {
            writeByte(value);
            return;
        }

        writeByte((value & SEGMENT_BITS) | CONTINUE_BIT);

        // Note: >>> means that the sign bit is shifted with the rest of the number rather than being left alone
        value >>>= 7;
    }
}

Warning.png Note Minecraft's VarInts are identical to LEB128 with the slight change of throwing a exception if it goes over a set amount of bytes.

Warning.png Note that Minecraft's VarInts are not encoded using Protocol Buffers; it's just similar. If you try to use Protocol Buffers Varints with Minecraft's VarInts, you'll get incorrect results in some cases. The major differences:

  • Minecraft's VarInts are all signed, but do not use the ZigZag encoding. Protocol buffers have 3 types of Varints: uint32 (normal encoding, unsigned), sint32 (ZigZag encoding, signed), and int32 (normal encoding, signed). Minecraft's are the int32 variety. Because Minecraft uses the normal encoding instead of ZigZag encoding, negative values always use the maximum number of bytes.
  • Minecraft's VarInts are never longer than 5 bytes and its VarLongs will never be longer than 10 bytes, while Protocol Buffer Varints will always use 10 bytes when encoding negative numbers, even if it's an int32.

Sample VarInts:

Value Hex bytes Decimal bytes
0 0x00 0
1 0x01 1
2 0x02 2
127 0x7f 127
128 0x80 0x01 128 1
255 0xff 0x01 255 1
25565 0xdd 0xc7 0x01 221 199 1
2097151 0xff 0xff 0x7f 255 255 127
2147483647 0xff 0xff 0xff 0xff 0x07 255 255 255 255 7
-1 0xff 0xff 0xff 0xff 0x0f 255 255 255 255 15
-2147483648 0x80 0x80 0x80 0x80 0x08 128 128 128 128 8

Sample VarLongs:

Value Hex bytes Decimal bytes
0 0x00 0
1 0x01 1
2 0x02 2
127 0x7f 127
128 0x80 0x01 128 1
255 0xff 0x01 255 1
2147483647 0xff 0xff 0xff 0xff 0x07 255 255 255 255 7
9223372036854775807 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0x7f 255 255 255 255 255 255 255 255 127
-1 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0x01 255 255 255 255 255 255 255 255 255 1
-2147483648 0x80 0x80 0x80 0x80 0xf8 0xff 0xff 0xff 0xff 0x01 128 128 128 128 248 255 255 255 255 1
-9223372036854775808 0x80 0x80 0x80 0x80 0x80 0x80 0x80 0x80 0x80 0x01 128 128 128 128 128 128 128 128 128 1

Position

Note: What you are seeing here is the latest version of the Data types article, but the position type was different before 1.14.

64-bit value split into three signed integer parts:

  • x: 26 MSBs
  • z: 26 middle bits
  • y: 12 LSBs

For example, a 64-bit position can be broken down as follows:

Example value (big endian): 01000110000001110110001100 10110000010101101101001000 001100111111

  • The red value is the X coordinate, which is 18357644 in this example.
  • The blue value is the Z coordinate, which is -20882616 in this example.
  • The green value is the Y coordinate, which is 831 in this example.

Encoded as follows:

((x & 0x3FFFFFF) << 38) | ((z & 0x3FFFFFF) << 12) | (y & 0xFFF)

And decoded as:

val = read_long();
x = val >> 38;
y = val << 52 >> 52;
z = val << 26 >> 38;

Note: The above assumes that the right shift operator sign extends the value (this is called an arithmetic shift), so that the signedness of the coordinates is preserved. In many languages, this requires the integer type of val to be signed. In the absence of such an operator, the following may be useful:

if x >= 1 << 25 { x -= 1 << 26 }
if y >= 1 << 11 { y -= 1 << 12 }
if z >= 1 << 25 { z -= 1 << 26 }

Fixed-point numbers

Some fields may be stored as fixed-point numbers, where a certain number of bits represents the signed integer part (number to the left of the decimal point) and the rest represents the fractional part (to the right). Floating points (float and double), in contrast, keep the number itself (mantissa) in one chunk, while the location of the decimal point (exponent) is stored beside it.

Essentially, while fixed-point numbers have lower range than floating points, their fractional precision is greater for higher values. This makes them ideal for representing global coordinates of an entity in Minecraft, as it's more important to store the integer part accurately than position them more precisely within a single block (or meter).

Coordinates are often represented as a 32-bit integer, where 5 of the least-significant bits are dedicated to the fractional part, and the rest store the integer part.

Java lacks support for fractional integers directly, but you can represent them as integers. To convert from a double to this integer representation, use the following formulas:

 abs_int = (int) (double * 32.0D);

And back again:

 double = (double) (abs_int / 32.0D);

Bit sets

The types BitSet and Fixed BitSet represent packed lists of bits. The Notchian implementation uses Java's BitSet class.

BitSet

Bit sets of type BitSet are prefixed by their length in longs.

Field Name Field Type Meaning
Length VarInt Number of longs in the following array. May be 0 (if no bits are set).
Data Array of Long A packed representation of the bit set as created by BitSet.toLongArray.

The ith bit is set when (Data[i / 64] & (1 << (i % 64))) != 0, where i starts at 0.

Fixed BitSet

Bit sets of type Fixed BitSet (n) have a fixed length of n bits, encoded as ceil(n / 8) bytes. Note that this is different from BitSet, which uses longs.

Field Name Field Type Meaning
Data Byte Array (n) A packed representation of the bit set as created by BitSet.toByteArray.

The ith bit is set when (Data[i / 8] & (1 << (i % 8))) != 0, where i starts at 0. This encoding is not equivalent to the long array in BitSet.


Other definitions

Term Definition
Player When used in the singular, Player always refers to the client connected to the server.
Entity Entity refers to any item, player, mob, minecart or boat etc. See the Minecraft Wiki article for a full list.
EID An EID — or Entity ID — is a 4-byte sequence used to identify a specific entity. An entity's EID is unique on the entire server.
XYZ In this document, the axis names are the same as those shown in the debug screen (F3). Y points upwards, X points east, and Z points south.
Meter The meter is Minecraft's base unit of length, equal to the length of a vertex of a solid block. The term “block” may be used to mean “meter” or “cubic meter”.
Global palette A table/dictionary/palette mapping nonnegative integers to block states. Block state IDs are created in a linear fashion based off of order of assignment. One block state ID allocated for each unique block state for a block; if a block has multiple properties then the number of allocated states is the product of the number of values for each property. A current list of properties and state ID ranges is found on burger.

Alternatively, the vanilla server now includes an option to export the current block state ID mapping, by running java -cp minecraft_server.jar net.minecraft.data.Main --reports. See Data Generators for more information.

Notchian The official implementation of vanilla Minecraft as developed and released by Mojang.

Packet format

Without compression

Field Name Field Type Notes
Length VarInt Length of Packet ID + Data
Packet ID VarInt
Data Byte Array Depends on the connection state and packet ID, see the sections below

With compression

Once a Set Compression packet (with a non-negative threshold) is sent, zlib compression is enabled for all following packets. The format of a packet changes slighty to include the size of the uncompressed packet.

Compressed? Field Name Field Type Notes
No Packet Length VarInt Length of Data Length + compressed length of (Packet ID + Data)
No Data Length VarInt Length of uncompressed (Packet ID + Data) or 0
Yes Packet ID VarInt zlib compressed packet ID (see the sections below)
Data Byte Array zlib compressed packet data (see the sections below)

The length given by the Packet Length field is the number of bytes that remain in that packet, including the Data Length field.

If Data Length is set to zero, then the packet is uncompressed; otherwise it is the size of the uncompressed packet.

If compressed, the uncompressed length of (Packet ID + Data) must be equal to or over the threshold set in the packet Set Compression, otherwise the receiving party will disconnect.

Compression can be disabled by sending the packet Set Compression with a negative Threshold, or not sending the Set Compression packet at all.

Handshaking

Clientbound

There are no clientbound packets in the Handshaking state, since the protocol immediately switches to a different state after the client sends the first packet.

Serverbound

Handshake

This causes the server to switch into the target state.

Packet ID State Bound To Field Name Field Type Notes
0x00 Handshaking Server Protocol Version VarInt See protocol version numbers (currently 753 in Minecraft 1.16.3)
Server Address String (255) Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information. Note that SRV records are a complete redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide mc.example.org as server address in addition to connecting to it.
Server Port Unsigned Short Default is 25565. The Notchian server does not use this information.
Next State VarInt Enum 1 for status, 2 for login

Legacy Server List Ping

Warning.png This packet uses a nonstandard format. It is never length-prefixed, and the packet ID is an Unsigned Byte instead of a VarInt.

While not technically part of the current protocol, legacy clients may send this packet to initiate Server List Ping, and modern servers should handle it correctly.

Packet ID State Bound To Field Name Field Type Notes
0xFE Handshaking Server Payload Unsigned Byte always 1 (0x01)

See Server List Ping#1.6 for the details of the protocol that follows this packet.

Status

Main article: Server List Ping

Clientbound

Response

Packet ID State Bound To Field Name Field Type Notes
0x00 Status Client
JSON Response String (32767) See Server List Ping#Response; as with all strings this is prefixed by its length as a VarInt

Pong

Packet ID State Bound To Field Name Field Type Notes
0x01 Status Client Payload Long Should be the same as sent by the client

Serverbound

Request

Packet ID State Bound To Field Name Field Type Notes
0x00 Status Server no fields

Ping

Packet ID State Bound To Field Name Field Type Notes
0x01 Status Server Payload Long May be any number. Notchian clients use a system-dependent time value which is counted in milliseconds.

Login

The login process is as follows:

  1. C→S: Handshake with Next State set to 2 (login)
  2. C→S: Login Start
  3. S→C: Encryption Request
  4. Client auth
  5. C→S: Encryption Response
  6. Server auth, both enable encryption
  7. S→C: Set Compression (optional)
  8. S→C: Login Success

Set Compression, if present, must be sent before Login Success. Note that anything sent after Set Compression must use the Post Compression packet format.

For unauthenticated ("cracked"/offline-mode) and localhost connections (either of the two conditions is enough for an unencrypted connection) there is no encryption. In that case Login Start is directly followed by Login Success.

See Protocol Encryption for details.

Clientbound

Disconnect (login)

Packet ID State Bound To Field Name Field Type Notes
0x00 Login Client Reason Chat

Encryption Request

Packet ID State Bound To Field Name Field Type Notes
0x01 Login Client Server ID String (20) Appears to be empty
Public Key Length VarInt Length of Public Key
Public Key Byte Array
Verify Token Length VarInt Length of Verify Token. Always 4 for Notchian servers.
Verify Token Byte Array A sequence of random bytes generated by the server

See Protocol Encryption for details.

Login Success

Packet ID State Bound To Field Name Field Type Notes
0x02 Login Client UUID UUID
Username String (16)

This packet switches the connection state to play.

Warning.png The (notchian) server might take a bit to fully transition to the Play state, so it's recommended to wait before sendings Play packets, either by setting a timeout, or waiting for Play packets from the server (usually Player Info).

The notchian client doesn't send any (non-keep alive) packets until the next tick/time update packet.

Set Compression

Enables compression. If compression is enabled, all following packets are encoded in the compressed packet format. Negative or zero values will disable compression, meaning the packet format should remain in the uncompressed packet format. However, this packet is entirely optional, and if not sent, compression will also not be enabled (the notchian server does not send the packet when compression is disabled).

Packet ID State Bound To Field Name Field Type Notes
0x03 Login Client Threshold VarInt Maximum size of a packet before it is compressed

Login Plugin Request

Used to implement a custom handshaking flow together with Login Plugin Response.

Unlike plugin messages in "play" mode, these messages follow a lock-step request/response scheme, where the client is expected to respond to a request indicating whether it understood. The notchian client always responds that it hasn't understood, and sends an empty payload.

Packet ID State Bound To Field Name Field Type Notes
0x04 Login Client Message ID VarInt Generated by the server - should be unique to the connection.
Channel Identifier Name of the plugin channel used to send the data
Data Byte Array Any data, depending on the channel. The length of this array must be inferred from the packet length.

Serverbound

Login Start

Packet ID State Bound To Field Name Field Type Notes
0x00 Login Server Name String (16) Player's Username

Encryption Response

Packet ID State Bound To Field Name Field Type Notes
0x01 Login Server Shared Secret Length VarInt Length of Shared Secret
Shared Secret Byte Array
Verify Token Length VarInt Length of Verify Token
Verify Token Byte Array

See Protocol Encryption for details.

Login Plugin Response

Packet ID State Bound To Field Name Field Type Notes
0x02 Login Server Message ID VarInt Should match ID from server.
Successful Boolean true if the client understands the request, false otherwise. When false, no payload follows.
Data Optional Byte Array Any data, depending on the channel. The length of this array must be inferred from the packet length.

Play

Clientbound

Spawn Entity

Sent by the server when a vehicle or other non-living entity is created.

Packet ID State Bound To Field Name Field Type Notes
0x00 Play Client Entity ID VarInt EID of the entity
Object UUID UUID
Type VarInt The type of entity (same as in Spawn Living Entity)
X Double
Y Double
Z Double
Pitch Angle
Yaw Angle
Data Int Meaning dependent on the value of the Type field, see Object Data for details.
Velocity X Short Same units as Entity Velocity. Always sent, but only used when Data is greater than 0 (except for some entities which always ignore it; see Object Data for details).
Velocity Y Short
Velocity Z Short

Spawn Experience Orb

Spawns one or more experience orbs.

Packet ID State Bound To Field Name Field Type Notes
0x01 Play Client Entity ID VarInt
X Double
Y Double
Z Double
Count Short The amount of experience this orb will reward once collected

Spawn Living Entity

Sent by the server when a living entity is spawned.

Packet ID State Bound To Field Name Field Type Notes
0x02 Play Client Entity ID VarInt
Entity UUID UUID
Type VarInt The type of mob. See Entities#Mobs
X Double
Y Double
Z Double
Yaw Angle
Pitch Angle
Head Pitch Angle
Velocity X Short Same units as Entity Velocity
Velocity Y Short Same units as Entity Velocity
Velocity Z Short Same units as Entity Velocity

Spawn Painting

This packet shows location, name, and type of painting.

Packet ID State Bound To Field Name Field Type Notes
0x03 Play Client Entity ID VarInt
Entity UUID UUID
Motive VarInt Panting's ID, see below
Location Position Center coordinates (see below)
Direction Byte Enum Direction the painting faces (North = 2, South = 0, West = 1, East = 3)

Calculating the center of an image: given a (width × height) grid of cells, with (0, 0) being the top left corner, the center is (max(0, width / 2 - 1), height / 2). E.g. (1, 0) for a 2×1 painting, or (1, 2) for a 4×4 painting.

List of paintings by coordinates in paintings_kristoffer_zetterstrand.png (where x and y are in pixels from the top left and width and height are in pixels or 16ths of a block):

Name ID x y width height
minecraft:kebab 0 0 0 16 16
minecraft:aztec 1 16 0 16 16
minecraft:alban 2 32 0 16 16
minecraft:aztec2 3 48 0 16 16
minecraft:bomb 4 64 0 16 16
minecraft:plant 5 80 0 16 16
minecraft:wasteland 6 96 0 16 16
minecraft:pool 7 0 32 32 16
minecraft:courbet 8 32 32 32 16
minecraft:sea 9 64 32 32 16
minecraft:sunset 10 96 32 32 16
minecraft:creebet 11 128 32 32 16
minecraft:wanderer 12 0 64 16 32
minecraft:graham 13 16 64 16 32
minecraft:match 14 0 128 32 32
minecraft:bust 15 32 128 32 32
minecraft:stage 16 64 128 32 32
minecraft:void 17 96 128 32 32
skull_and_roses 18 128 128 32 32
minecraft:wither 19 160 128 32 32
minecraft:fighters 20 0 96 64 32
minecraft:pointer 21 0 192 64 64
minecraft:pigscene 22 64 192 64 64
minecraft:burning_skull 23 128 192 64 64
minecraft:skeleton 24 192 64 64 48
minecraft:donkey_kong 25 192 112 64 48

The Minecraft Wiki article on paintings also provides a list of painting names to the actual images.

Spawn Player

This packet is sent by the server when a player comes into visible range, not when a player joins.

This packet must be sent after the Player Info packet that adds the player data for the client to use when spawning a player. If the Player Info for the player spawned by this packet is not present when this packet arrives, Notchian clients will not spawn the player entity. The Player Info packet includes skin/cape data.

Servers can, however, safely spawn player entities for players not in visible range. The client appears to handle it correctly.

Packet ID State Bound To Field Name Field Type Notes
0x04 Play Client Entity ID VarInt Player's EID
Player UUID UUID See below for notes on offline mode and NPCs
X Double
Y Double
Z Double
Yaw Angle
Pitch Angle

When in online mode, the UUIDs must be valid and have valid skin blobs.

In offline mode, UUID v3 is used with the String OfflinePlayer:<player name>, encoded in UTF-8 (and case-sensitive).

For NPCs UUID v2 should be used. Note:

<+Grum> i will never confirm this as a feature you know that :)

In an example UUID, xxxxxxxx-xxxx-Yxxx-xxxx-xxxxxxxxxxxx, the UUID version is specified by Y. So, for UUID v3, Y will always be 3, and for UUID v2, Y will always be 2.

Entity Animation (clientbound)

Sent whenever an entity should change animation.

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Client Entity ID VarInt Player ID
Animation Unsigned Byte Animation ID (see below)

Animation can be one of the following values:

ID Animation
0 Swing main arm
1 Take damage
2 Leave bed
3 Swing offhand
4 Critical effect
5 Magic critical effect

Statistics

Sent as a response to Client Status 0x04 (id 1). Will only send the changed values if previously requested.

Packet ID State Bound To Field Name Field Type Notes
0x06 Play Client Count VarInt Number of elements in the following array
Statistic Category ID Array VarInt See below
Statistic ID VarInt See below
Value VarInt The amount to set it to

Categories (these are namespaced, but with : replaced with .):

Name ID Registry
minecraft.mined 0 Blocks
minecraft.crafted 1 Items
minecraft.used 2 Items
minecraft.broken 3 Items
minecraft.picked_up 4 Items
minecraft.dropped 5 Items
minecraft.killed 6 Entities
minecraft.killed_by 7 Entities
minecraft.custom 8 Custom

Blocks, Items, and Entities use block (not block state), item, and entity ids.

Custom has the following (unit only matters for clients):

Name ID Unit
minecraft.leave_game 0 None
minecraft.play_one_minute 1 Time
minecraft.time_since_death 2 Time
minecraft.sneak_Time 3 Time
minecraft.walk_one_cm 4 Distance
minecraft.crouch_one_cm 5 Distance
minecraft.sprint_one_cm 6 Distance
minecraft.swim_one_cm 7 Distance
minecraft.fall_one_cm 8 Distance
minecraft.climb_one_cm 9 Distance
minecraft.fly_one_cm 10 Distance
minecraft.dive_one_cm 11 Distance
minecraft.minecart_one_cm 12 Distance
minecraft.boat_one_cm 13 Distance
minecraft.pig_one_cm 14 Distance
minecraft.horse_one_cm 15 Distance
minecraft.aviate_one_cm 16 Distance
minecraft.jump 17 None
minecraft.drop 18 None
minecraft.damage_dealt 19 Damage
minecraft.damage_taken 20 Damage
minecraft.deaths 21 None
minecraft.mob_kills 22 None
minecraft.animals_bred 23 None
minecraft.player_kills 24 None
minecraft.fish_caught 25 None
minecraft.talked_to_villager 26 None
minecraft.traded_with_villager 27 None
minecraft.eat_cake_slice 28 None
minecraft.fill_cauldron 29 None
minecraft.use_cauldron 30 None
minecraft.clean_armor 31 None
minecraft.clean_banner 32 None
minecraft.interact_with_brewingstand 33 None
minecraft.interact_with_beacon 34 None
minecraft.inspect_dropper 35 None
minecraft.inspect_hopper 36 None
minecraft.inspect_dispenser 37 None
minecraft.play_noteblock 38 None
minecraft.tune_noteblock 39 None
minecraft.pot_flower 40 None
minecraft.trigger_trapped_chest 41 None
minecraft.open_enderchest 42 None
minecraft.enchant_item 43 None
minecraft.play_record 44 None
minecraft.interact_with_furnace 45 None
minecraft.interact_with_crafting_table 46 None
minecraft.open_chest 47 None
minecraft.sleep_in_bed 48 None
minecraft.open_shulker_box 49 None

Units:

  • None: just a normal number (formatted with 0 decimal places)
  • Damage: value is 10 times the normal amount
  • Distance: a distance in centimeters (hundredths of blocks)
  • Time: a time span in ticks

Acknowledge Player Digging

Packet ID State Bound To Field Name Field Type Notes
0x07 Play Client Location Position Position where the digging was happening
Block VarInt Block state ID of the block that should be at that position now.
Status VarInt enum Same as Player Digging. Only Started digging (0), Cancelled digging (1), and Finished digging (2) are used.
Successful Boolean True if the digging succeeded; false if the client should undo any changes it made locally. (How does this work?)

Block Break Animation

0–9 are the displayable destroy stages and each other number means that there is no animation on this coordinate.

Block break animations can still be applied on air; the animation will remain visible although there is no block being broken. However, if this is applied to a transparent block, odd graphical effects may happen, including water losing its transparency. (An effect similar to this can be seen in normal gameplay when breaking ice blocks)

If you need to display several break animations at the same time you have to give each of them a unique Entity ID. The entity ID does not need to correspond to an actual entity on the client. It is valid to use a randomly generated number.

Packet ID State Bound To Field Name Field Type Notes
0x08 Play Client Entity ID VarInt Entity ID of the entity breaking the block
Location Position Block Position
Destroy Stage Byte 0–9 to set it, any other value to remove it

Block Entity Data

Sets the block entity associated with the block at the given location.

Packet ID State Bound To Field Name Field Type Notes
0x09 Play Client Location Position
Action Unsigned Byte The type of update to perform, see below
NBT Data NBT Tag Data to set. May be a TAG_END (0), in which case the block entity at the given location is removed (though this is not required since the client will remove the block entity automatically on chunk unload or block removal)

Action field:

  • 1: Set data of a mob spawner (everything except for SpawnPotentials: current delay, min/max delay, mob to be spawned, spawn count, spawn range, etc.)
  • 2: Set command block text (command and last execution status)
  • 3: Set the level, primary, and secondary powers of a beacon
  • 4: Set rotation and skin of mob head
  • 5: Declare a conduit
  • 6: Set base color and patterns on a banner
  • 7: Set the data for a Structure tile entity
  • 8: Set the destination for a end gateway
  • 9: Set the text on a sign
  • 10: Unused
  • 11: Declare a bed
  • 12: Set data of a jigsaw block
  • 13: Set items in a campfire
  • 14: Behive information

Block Action

This packet is used for a number of actions and animations performed by blocks, usually non-persistent.

See Block Actions for a list of values.

Warning.png This packet uses a block ID, not a block state. Unfortunately, block IDs are not directly included in the output from Data Generators, but can manually be calculated.

Packet ID State Bound To Field Name Field Type Notes
0x0A Play Client Location Position Block coordinates
Action ID (Byte 1) Unsigned Byte Varies depending on block — see Block Actions
Action Param (Byte 2) Unsigned Byte Varies depending on block — see Block Actions
Block Type VarInt The block type ID for the block. This must match the block at the given coordinates.

Block Change

Fired whenever a block is changed within the render distance.

Warning.png Changing a block in a chunk that is not loaded is not a stable action. The Notchian client currently uses a shared empty chunk which is modified for all block changes in unloaded chunks; while in 1.9 this chunk never renders in older versions the changed block will appear in all copies of the empty chunk. Servers should avoid sending block changes in unloaded chunks and clients should ignore such packets.

Packet ID State Bound To Field Name Field Type Notes
0x0B Play Client Location Position Block Coordinates
Block ID VarInt The new block state ID for the block as given in the global palette. See that section for more information.

Boss Bar

Packet ID State Bound To Field Name Field Type Notes
0x0C Play Client UUID UUID Unique ID for this bar
Action VarInt Enum Determines the layout of the remaining packet
Action Field Name
0: add Title Chat
Health Float From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
Color VarInt Enum Color ID (see below)
Division VarInt Enum Type of division (see below)
Flags Unsigned Byte Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music), 0x04: create fog (previously was also controlled by 0x02)
1: remove no fields no fields Removes this boss bar
2: update health Health Float as above
3: update title Title Chat
4: update style Color VarInt Enum Color ID (see below)
Dividers VarInt Enum as above
5: update flags Flags Unsigned Byte as above
ID Color
0 Pink
1 Blue
2 Red
3 Green
4 Yellow
5 Purple
6 White
ID Type of division
0 No division
1 6 notches
2 10 notches
3 12 notches
4 20 notches

Server Difficulty

Changes the difficulty setting in the client's option menu

Packet ID State Bound To Field Name Field Type Notes
0x0D Play Client Difficulty Unsigned Byte 0: peaceful, 1: easy, 2: normal, 3: hard
Difficulty locked? Boolean

Chat Message (clientbound)

Identifying the difference between Chat/System Message is important as it helps respect the user's chat visibility options. See processing chat for more info about these positions.

Warning.png Game info accepts json formatting but does not display it, although the deprecated §-based formatting works. This is not an issue when using the Title packet, so prefer that packet for displaying information in that slot. See MC-119145 for more information.

Packet ID State Bound To Field Name Field Type Notes
0x0E Play Client JSON Data Chat Limited to 32767 bytes
Position Byte 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar).
Sender UUID Used by the Notchian client for the disableChat launch option. Setting both longs to 0 will always display the message regardless of the setting.

Tab-Complete (clientbound)

The server responds with a list of auto-completions of the last word sent to it. In the case of regular chat, this is a player username. Command names and parameters are also supported. The client sorts these alphabetically before listing them.

Packet ID State Bound To Field Name Field Type Notes
0xF Play Client
ID VarInt Transaction ID
Start VarInt Start of the text to replace
Length VarInt Length of the text to replace
Count VarInt Number of elements in the following array
Matches Match Array String (32767) One eligible value to insert, note that each command is sent separately instead of in a single string, hence the need for Count. Note that for instance this doesn't include a leading / on commands.
Has tooltip Boolean True if the following is present
Tooltip Optional Chat Tooltip to display; only present if previous boolean is true

Declare Commands

Lists all of the commands on the server, and how they are parsed.

This is a directed graph, with one root node. Each redirect or child node must refer only to nodes that have already been declared.

Packet ID State Bound To Field Name Field Type Notes
0x10 Play Client Count VarInt Number of elements in the following array
Nodes Array of Node An array of nodes
Root index VarInt Index of the root node in the previous array

For more information on this packet, see the Command Data article.

Window Confirmation (clientbound)

A packet from the server indicating whether a request from the client was accepted, or whether there was a conflict (due to lag). If the packet was not accepted, the client must respond with a serverbound window confirmation packet.

Packet ID State Bound To Field Name Field Type Notes
0x11 Play Client Window ID Byte The ID of the window that the action occurred in
Action Number Short Every action that is to be accepted has a unique number. This number is an incrementing integer (starting at 0) with separate counts for each window ID.
Accepted Boolean Whether the action was accepted

Close Window (clientbound)

This packet is sent from the server to the client when a window is forcibly closed, such as when a chest is destroyed while it's open.

Packet ID State Bound To Field Name Field Type Notes
0x12 Play Client Window ID Unsigned Byte This is the ID of the window that was closed. 0 for inventory.

Window Items

The inventory slots

Sent by the server when items in multiple slots (in a window) are added/removed. This includes the main inventory, equipped armour and crafting slots.

Packet ID State Bound To Field Name Field Type Notes
0x13 Play Client Window ID Unsigned Byte The ID of window which items are being sent for. 0 for player inventory.
Count Short Number of elements in the following array
Slot Data Array of Slot

See inventory windows for further information about how slots are indexed.

Window Property

This packet is used to inform the client that part of a GUI window should be updated.

Packet ID State Bound To Field Name Field Type Notes
0x14 Play Client Window ID Unsigned Byte
Property Short The property to be updated, see below
Value Short The new value for the property, see below

The meaning of the Property field depends on the type of the window. The following table shows the known combinations of window type and property, and how the value is to be interpreted.

Window type Property Value
Furnace 0: Fire icon (fuel left) counting from fuel burn time down to 0 (in-game ticks)
1: Maximum fuel burn time fuel burn time or 0 (in-game ticks)
2: Progress arrow counting from 0 to maximum progress (in-game ticks)
3: Maximum progress always 200 on the notchian server
Enchantment Table 0: Level requirement for top enchantment slot The enchantment's xp level requirement
1: Level requirement for middle enchantment slot
2: Level requirement for bottom enchantment slot
3: The enchantment seed Used for drawing the enchantment names (in SGA) clientside. The same seed is used to calculate enchantments, but some of the data isn't sent to the client to prevent easily guessing the entire list (the seed value here is the regular seed bitwise and 0xFFFFFFF0).
4: Enchantment ID shown on mouse hover over top enchantment slot The enchantment id (set to -1 to hide it), see below for values
5: Enchantment ID shown on mouse hover over middle enchantment slot
6: Enchantment ID shown on mouse hover over bottom enchantment slot
7: Enchantment level shown on mouse hover over the top slot The enchantment level (1 = I, 2 = II, 6 = VI, etc.), or -1 if no enchant
8: Enchantment level shown on mouse hover over the middle slot
9: Enchantment level shown on mouse hover over the bottom slot
Beacon 0: Power level 0-4, controls what effect buttons are enabled
1: First potion effect Potion effect ID for the first effect, or -1 if no effect
2: Second potion effect Potion effect ID for the second effect, or -1 if no effect
Anvil 0: Repair cost The repair's cost in xp levels
Brewing Stand 0: Brew time 0 – 400, with 400 making the arrow empty, and 0 making the arrow full
1: Fuel time 0 - 20, with 0 making the arrow empty, and 20 making the arrow full
Stonecutter 0: Selected recipe The index of the selected recipe. -1 means none is selected.
Loom 0: Selected pattern The index of the selected pattern. 0 means none is selected, 0 is also the internal id of the "base" pattern.

For an enchanting table, the following numerical IDs are used:

Numerical ID Enchantment ID Enchantment Name
0 minecraft:protection Protection
1 minecraft:fire_protection Fire Protection
2 minecraft:feather_falling Feather Falling
3 minecraft:blast_protection Blast Protection
4 minecraft:projectile_protection Projectile Protection
5 minecraft:respiration Respiration
6 minecraft:aqua_affinity Aqua Affinity
7 minecraft:thorns Thorns
8 minecraft:depth_strider Depth Strider
9 minecraft:frost_walker Frost Walker
10 minecraft:binding_curse Curse of Binding
11 minecraft:sharpness Sharpness
12 minecraft:smite Smite
13 minecraft:bane_of_arthropods Bane of Arthropods
14 minecraft:knockback Knockback
15 minecraft:fire_aspect Fire Aspect
16 minecraft:looting Looting
17 minecraft:sweeping Sweeping Edge
18 minecraft:efficiency Efficiency
19 minecraft:silk_touch Silk Touch
20 minecraft:unbreaking Unbreaking
21 minecraft:fortune Fortune
22 minecraft:power Power
23 minecraft:punch Punch
24 minecraft:flame Flame
25 minecraft:infinity Infinity
26 minecraft:luck_of_the_sea Luck of the Sea
27 minecraft:lure Lure
28 minecraft:loyalty Loyalty
29 minecraft:impaling Impaling
30 minecraft:riptide Riptide
31 minecraft:channeling Channeling
32 minecraft:mending Mending
33 minecraft:vanishing_curse Curse of Vanishing

Set Slot

Sent by the server when an item in a slot (in a window) is added/removed.

Packet ID State Bound To Field Name Field Type Notes
0x15 Play Client Window ID Byte The window which is being updated. 0 for player inventory. Note that all known window types include the player inventory. This packet will only be sent for the currently opened window while the player is performing actions, even if it affects the player inventory. After the window is closed, a number of these packets are sent to update the player's inventory window (0).
Slot Short The slot that should be updated
Slot Data Slot

To set the cursor (the item currently dragged with the mouse), use -1 as Window ID and as Slot.

This packet can only be used to edit the hotbar of the player's inventory if window ID is set to 0 (slots 36 through 44). If the window ID is set to -2, then any slot in the inventory can be used but no add item animation will be played.

Set Cooldown

Applies a cooldown period to all items with the given type. Used by the Notchian server with enderpearls. This packet should be sent when the cooldown starts and also when the cooldown ends (to compensate for lag), although the client will end the cooldown automatically. Can be applied to any item, note that interactions still get sent to the server with the item but the client does not play the animation nor attempt to predict results (i.e block placing).

Packet ID State Bound To Field Name Field Type Notes
0x16 Play Client Item ID VarInt Numeric ID of the item to apply a cooldown to.
Cooldown Ticks VarInt Number of ticks to apply a cooldown for, or 0 to clear the cooldown.

Plugin Message (clientbound)

Main article: Plugin channels

Mods and plugins can use this to send their data. Minecraft itself uses several plugin channels. These internal channels are in the minecraft namespace.

More documentation on this: http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/

Packet ID State Bound To Field Name Field Type Notes
0x17 Play Client Channel Identifier Name of the plugin channel used to send the data
Data Byte Array Any data, depending on the channel. minecraft: channels are documented here. The length of this array must be inferred from the packet length.

Named Sound Effect

See also: #Sound Effect

Used to play a sound effect on the client. Custom sounds may be added by resource packs.

Packet ID State Bound To Field Name Field Type Notes
0x18 Play Client Sound Name Identifier All sound effect names as of 1.16.3 can be seen here.
Sound Category VarInt Enum The category that this sound will be played from (current categories)
Effect Position X Int Effect X multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part)
Effect Position Y Int Effect Y multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part)
Effect Position Z Int Effect Z multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part)
Volume Float 1 is 100%, can be more
Pitch Float Float between 0.5 and 2.0 by Notchian clients

Disconnect (play)

Sent by the server before it disconnects a client. The client assumes that the server has already closed the connection by the time the packet arrives.

Packet ID State Bound To Field Name Field Type Notes
0x19 Play Client Reason Chat Displayed to the client when the connection terminates.

Entity Status

Entity statuses generally trigger an animation for an entity. The available statuses vary by the entity's type (and are available to subclasses of that type as well).

Packet ID State Bound To Field Name Field Type Notes
0x1A Play Client Entity ID Int
Entity Status Byte Enum See below

See Entity statuses for a list of which statuses are valid for each type of entity.

Explosion

Sent when an explosion occurs (creepers, TNT, and ghast fireballs).

Each block in Records is set to air. Coordinates for each axis in record is int(X) + record.x

Packet ID State Bound To Field Name Field Type Notes
0x1B Play Client X Float
Y Float
Z Float
Strength Float A strength greater than or equal to 2.0 spawns a minecraft:explosion_emitter particle, while a lesser strength spawns a minecraft:explosion particle.
Record Count Int Number of elements in the following array
Records Array of (Byte, Byte, Byte) Each record is 3 signed bytes long; the 3 bytes are the XYZ (respectively) signed offsets of affected blocks.
Player Motion X Float X velocity of the player being pushed by the explosion
Player Motion Y Float Y velocity of the player being pushed by the explosion
Player Motion Z Float Z velocity of the player being pushed by the explosion

Unload Chunk

Tells the client to unload a chunk column.

Packet ID State Bound To Field Name Field Type Notes
0x1C Play Client Chunk X Int Block coordinate divided by 16, rounded down
Chunk Z Int Block coordinate divided by 16, rounded down

It is legal to send this packet even if the given chunk is not currently loaded.

Change Game State

Used for a wide variety of game state things, from whether to bed use to gamemode to demo messages.

Packet ID State Bound To Field Name Field Type Notes
0x1D Play Client Reason Unsigned Byte See below
Value Float Depends on Reason

Reason codes:

Reason Effect Value
0 No respawn block available Note: Sends message 'block.minecraft.spawn.not_valid'(You have no home bed or charged respawn anchor, or it was obstructed) to the client.
1 End raining
2 Begin raining
3 Change gamemode 0: Survival, 1: Creative, 2: Adventure, 3: Spectator
4 Win game 0: Just respawn player.
1: Roll the credits and respawn player.
Note that 1 is only sent by notchian server when player has not yet achieved advancement "The end?", else 0 is sent.
5 Demo event 0: Show welcome to demo screen
101: Tell movement controls
102: Tell jump control
103: Tell inventory control
104: Tell that the demo is over and print a message about how to take a screenshot
6 Arrow hit player Note: Sent when any player is struck by an arrow.
7 Rain level change Note: Seems to change both skycolor and lightning. You can see some level images here
This can cause HUD color change in client, when level is higher than 20. It goes away only when game is restarted or client receives same packet (from any server) but with value of 0. Is this a bug?

Rain level starting from 0.
8 Thunder level change Note: Seems to change both skycolor and lightning (same as Rain level change, but doesn't start rain). It also requires rain to render by notchian client. ()
This can cause HUD color change in client, when level is higher than 20. It goes away only when game is restarted or client receives same packet (from any server) but with value of 0. Is this a bug?

Thunder level starting from 0.
9 Play pufferfish sting sound
10 Play elder guardian mob appearance (effect and sound)
11 Enable respawn screen 0: Enable respawn screen, 1: Immediately respawn (sent when the doImmediateRespawn gamerule changes)

Open Horse Window

This packet is used exclusively for opening the horse GUI. Open Window is used for all other GUIs.

Packet ID State Bound To Field Name Field Type Notes
0x1E Play Client Window ID? Byte
Number of slots? VarInt
Entity ID? Integer

Keep Alive (clientbound)

The server will frequently send out a keep-alive, each containing a random ID. The client must respond with the same packet. If the client does not respond to them for over 30 seconds, the server kicks the client. Vice versa, if the server does not send any keep-alives for 20 seconds, the client will disconnect and yields a "Timed out" exception.

The Notchian server uses a system-dependent time in milliseconds to generate the keep alive ID value.

Packet ID State Bound To Field Name Field Type Notes
0x1F Play Client Keep Alive ID Long

Chunk Data

Main article: Chunk Format
See also: #Unload Chunk
Huh.png The following information needs to be added to this page:
How do biomes work now? The biome change happened at the same time as the seed change, but it's not clear how/if biomes could be computed given that it's not the actual seed... (/r/mojira discussion which notes that it seems to be some kind of interpolation, and 3D biomes are only used in the nether)

The server only sends skylight information for chunk pillars in the Overworld, it's up to the client to know in which dimenison the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent. This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with Update Block Entity later).

Packet ID State Bound To Field Name Field Type Notes
0x20 Play Client Chunk X Int Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z Int Chunk coordinate (block coordinate divided by 16, rounded down)
Full chunk Boolean See Chunk Format
Primary Bit Mask VarInt Bitmask with bits set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15).
Heightmaps NBT Compound containing one long array named MOTION_BLOCKING, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a WORLD_SURFACE long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
Biomes length Optional VarInt Size of the following array. Not present if full chunk is false.
Biomes Optional array of VarInt 1024 biome IDs, ordered by x then z then y, in 4×4×4 blocks.Possibly something else. Not present if full chunk is false.
Size VarInt Size of Data in bytes
Data Byte array See data structure in Chunk Format
Number of block entities VarInt Number of elements in the following array
Block entities Array of NBT Tag All block entities in the chunk. Use the x, y, and z tags in the NBT to determine their positions.

Note that the Notchian client requires an Update View Position packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.

The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.

New format, 5 bits per block, containing the following references to blocks in a palette (not shown): 122344566480743131516914101202

0020863148418841 0000000000100000100001100011000101001000010000011000100001000001
01018A7260F68C87 0000000100000001100010100111001001100000111101101000110010000111

Effect

Sent when a client is to play a sound or particle effect.

By default, the Minecraft client adjusts the volume of sound effects based on distance. The final boolean field is used to disable this, and instead the effect is played from 2 blocks away in the correct direction. Currently this is only used for effect 1023 (wither spawn), effect 1028 (enderdragon death), and effect 1038 (end portal opening); it is ignored on other effects.

Packet ID State Bound To Field Name Field Type Notes
0x21 Play Client Effect ID Int The ID of the effect, see below
Location Position The location of the effect
Data Int Extra data for certain effects, see below
Disable Relative Volume Boolean See above

Effect IDs:

ID Name Data
Sound
1000 Dispenser dispenses
1001 Dispenser fails to dispense
1002 Dispenser shoots
1003 Ender eye launched
1004 Firework shot
1005 Iron door opened
1006 Wooden door opened
1007 Wooden trapdoor opened
1008 Fence gate opened
1009 Fire extinguished
1010 Play record Special case, see below for more info
1011 Iron door closed
1012 Wooden door closed
1013 Wooden trapdoor closed
1014 Fence gate closed
1015 Ghast warns
1016 Ghast shoots
1017 Enderdragon shoots
1018 Blaze shoots
1019 Zombie attacks wood door
1020 Zombie attacks iron door
1021 Zombie breaks wood door
1022 Wither breaks block
1023 Wither spawned
1024 Wither shoots
1025 Bat takes off
1026 Zombie infects
1027 Zombie villager converted
1028 Ender dragon death
1029 Anvil destroyed
1030 Anvil used
1031 Anvil landed
1032 Portal travel
1033 Chorus flower grown
1034 Chorus flower died
1035 Brewing stand brewed
1036 Iron trapdoor opened
1037 Iron trapdoor closed
1038 End portal created in overworld
1039 Phantom bites
1040 Zombie converts to drowned
1041 Husk converts to zombie by drowning
1042 Grindstone used
1043 Book page turned
Particle
1500 Composter composts
1501 Lava converts block (either water to stone, or removes existing blocks such as torches)
1502 Redstone torch burns out
1503 Ender eye placed
2000 Spawns 10 smoke particles, e.g. from a fire Direction, see below
2001 Block break + block break sound Block state, as an index into the global palette
2002 Splash potion. Particle effect + glass break sound. Potion ID
2003 Eye of Ender entity break animation — particles and sound
2004 Mob spawn particle effect: smoke + flames
2005 Bonemeal particles How many particles to spawn (if set to 0, 15 are spawned)
2006 Dragon breath
2007 Instant splash potion Potion ID
2008 Ender dragon destroys block
2009 Wet sponge vaporizes in nether
3000 End gateway spawn
3001 Enderdragon growl

Smoke directions:

ID Direction
0 South-East
1 South
2 South-West
3 East
4 (Up or middle ?)
5 West
6 North-East
7 North
8 North-West

Play record: This is actually a special case within this packet. You can start/stop a record at a specific location. Use a valid Record ID to start a record (or overwrite a currently playing one), any other value will stop the record. See Data Generators for information on item IDs.

Particle

Displays the named particle

Packet ID State Bound To Field Name Field Type Notes
0x22 Play Client Particle ID Int The particle ID listed in the particle data type.
Long Distance Boolean If true, particle distance increases from 256 to 65536
X Double X position of the particle
Y Double Y position of the particle
Z Double Z position of the particle
Offset X Float This is added to the X position after being multiplied by random.nextGaussian()
Offset Y Float This is added to the Y position after being multiplied by random.nextGaussian()
Offset Z Float This is added to the Z position after being multiplied by random.nextGaussian()
Particle Data Float The data of each particle
Particle Count Int The number of particles to create
Data Varies The variable data listed in the particle data type.

Update Light

Updates light levels for a chunk.

Packet ID State Bound To Field Name Field Type Notes
0x23 Play Client Chunk X VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Trust Edges Boolean If edges should be trusted for light updates.
Sky Light Mask VarInt Mask containing 18 bits, with the lowest bit corresponding to chunk section -1 (in the void, y=-16 to y=-1) and the highest bit for chunk section 16 (above the world, y=256 to y=271)
Block Light Mask VarInt Mask containing 18 bits, with the same order as sky light
Empty Sky Light Mask VarInt Mask containing 18 bits, which indicates sections that have 0 for all their sky light values. If a section is set in both this mask and the main sky light mask, it is ignored for this mask and it is included in the sky light arrays (the notchian server does not create such masks). If it is only set in this mask, it is not included in the sky light arrays.
Empty Block Light Mask VarInt Mask containing 18 bits, which indicates sections that have 0 for all their block light values. If a section is set in both this mask and the main block light mask, it is ignored for this mask and it is included in the block light arrays (the notchian server does not create such masks). If it is only set in this mask, it is not included in the block light arrays.
Sky Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Sky Light array Array of 2048 bytes There is 1 array for each bit set to true in the sky light mask, starting with the lowest value. Half a byte per light value.
Block Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Block Light array Array of 2048 bytes There is 1 array for each bit set to true in the block light mask, starting with the lowest value. Half a byte per light value.

Individual block or sky light arrays are is given for each block with increasing x coordinates, within rows of increasing z coordinates, within layers of increasing y coordinates. Even-indexed items (those with an even x coordinate, starting at 0) are packed into the low bits, odd-indexed into the high bits.

For the arrays: there are 18 of each, 18 block light arrays and 18 sky light arrays. Each array is in the format described, 2048 as a VarInt, followed by 2048 bytes which describe 4096 items. The update masks use their 18 least significant bits to indicate whether or not the packet will include an array at that index. For example: if all bits except for the least significant bit are set to 1, and the least significant bit is set to 0, then all arrays except for array #0 are included (for a total of 17 arrays or 17 * 2048 bytes).

Join Game

See Protocol Encryption for information on logging in.

Packet ID State Bound To Field Name Field Type Notes
0x24 Play Client Entity ID Int The player's Entity ID (EID)
Is hardcore Boolean
Gamemode Unsigned Byte 0: Survival, 1: Creative, 2: Adventure, 3: Spectator.
Previous Gamemode Byte 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. Defaults to -1 if there is no previous gamemode. (More information needed)
World Count VarInt Size of the following array
World Names Array of Identifier Identifiers for all worlds on the server
Dimension Codec NBT Tag Compound The full extent of these is still unknown, but the tag represents a dimension and biome registry. See below for the vanilla default.
Dimension NBT Tag Compound Valid dimensions are defined per dimension registry sent before this
World Name Identifier Name of the world being spawned into
Hashed seed Long First 8 bytes of the SHA-256 hash of the world's seed.
Max Players VarInt Was once used by the client to draw the player list, but now is ignored
View Distance VarInt Render distance (2-32)
Reduced Debug Info Boolean If true, a Notchian client shows reduced information on the debug screen. For servers in development, this should almost always be false.
Enable respawn screen Boolean Set to false when the doImmediateRespawn gamerule is true
Is Debug Boolean True if the world is a debug mode world; debug mode worlds cannot be modified and have predefined blocks
Is Flat Boolean True if the world is a superflat world; flat worlds have different void fog and a horizon at y=0 instead of y=63
Huh.png The following information needs to be added to this page:
Lay out and explain the format

Default Vanilla Dimension/Biome Codec

Known dimension attributes:

Name Type Meaning Values
name String Dimension's name "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
piglin_safe Byte Whether piglins shake and transform to zombified piglins. 1: true, 0: false
natural Byte When false, compasses spin randomly. When true, nether portals can spawn zombified piglins. 1: true, 0: false
ambient_light Float How much light the dimension has. 0.0 to 1.0
fixed_time Long If this is set to a number, the time of the day is the specified value. false, or 0 to 24000
infiniburn String A resource location defining what block tag to use for infiniburn. "" or minecraft resource "minecraft:..."
respawn_anchor_works Byte Whether players can charge and use respawn anchors. 1: true, 0: false
has_skylight Byte Whether the dimension has skylight access or not. 1: true, 0: false
bed_works Byte Whether players can use a bed to sleep. 1: true, 0: false
effects String ? "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
has_raids Byte Whether players with the Bad Omen effect can cause a raid. 1: true, 0: false
logical_height Int The maximum height to which chorus fruits and nether portals can bring players within this dimension. 0-256
coordinate_scale Float The multiplier applied to coordinates when traveling to the dimension. 1: true, 0: false
ultrawarm Byte Whether the dimensions behaves like the nether (water evaporates and sponges dry) or not. Also causes lava to spread thinner. 1: true, 0: false
has_ceiling Byte Whether the dimension has a bedrock ceiling or not. When true, causes lava to spread faster. 1: true, 0: false

Map Data

Updates a rectangular area on a map item.

Packet ID State Bound To Field Name Field Type Notes
0x25 Play Client Map ID VarInt Map ID of the map being modified
Scale Byte From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
Tracking Position Boolean Specifies whether player and item frame icons are shown
Locked Boolean True if the map has been locked in a cartography table
Icon Count VarInt Number of elements in the following array
Icon Type Array VarInt enum See below
X Byte Map coordinates: -128 for furthest left, +127 for furthest right
Z Byte Map coordinates: -128 for highest, +127 for lowest
Direction Byte 0-15
Has Display Name Boolean
Display Name Optional Chat Only present if previous Boolean is true
Columns Unsigned Byte Number of columns updated
Rows Optional Byte Only if Columns is more than 0; number of rows updated
X Optional Byte Only if Columns is more than 0; x offset of the westernmost column
Z Optional Byte Only if Columns is more than 0; z offset of the northernmost row
Length Optional VarInt Only if Columns is more than 0; length of the following array
Data Optional Array of Unsigned Byte Only if Columns is more than 0; see Map item format

For icons, a direction of 0 is a vertical icon and increments by 22.5° (360/16).

Types are based off of rows and columns in map_icons.png:

Icon type Result
0 White arrow (players)
1 Green arrow (item frames)
2 Red arrow
3 Blue arrow
4 White cross
5 Red pointer
6 White circle (off-map players)
7 Small white circle (far-off-map players)
8 Mansion
9 Temple
10 White Banner
11 Orange Banner
12 Magenta Banner
13 Light Blue Banner
14 Yellow Banner
15 Lime Banner
16 Pink Banner
17 Gray Banner
18 Light Gray Banner
19 Cyan Banner
20 Purple Banner
21 Blue Banner
22 Brown Banner
23 Green Banner
24 Red Banner
25 Black Banner
26 Treasure marker

Trade List

The list of trades a villager NPC is offering.

Packet ID State Bound To Field Name Field Type Notes
0x26 Play Client
Window ID VarInt The ID of the window that is open; this is an int rather than a byte.
Size Byte The number of trades in the following array
Trades Input item 1 Array Slot The first item the villager is buying
Output item Slot The item the villager is selling
Has second item Boolean Whether there is a second item
Input item 2 Optional Slot The second item the villager is buying; only present if they have a second item.
Trade disabled Boolean True if the trade is disabled; false if the trade is enabled.
Number of trade uses Integer Number of times the trade has been used so far
Maximum number of trade uses Integer Number of times this trade can be used
XP Integer
Special Price Integer
Price Multiplier Float
Demand Integer
Villager level VarInt Appears on the trade GUI; meaning comes from the translation key merchant.level. + level.

1: Novice, 2: Apprentice, 3: Journeyman, 4: Expert, 5: Master

Experience VarInt Total experience for this villager (always 0 for the wandering trader)
Is regular villager Boolean True if this is a regular villager; false for the wandering trader. When false, hides the villager level and some other GUI elements.
Can restock Boolean True for regular villagers and false for the wandering trader. If true, the "Villagers restock up to two times per day." message is displayed when hovering over disabled trades.
The merchant UI, for reference

Entity Position

This packet is sent by the server when an entity moves less then 8 blocks; if an entity moves more than 8 blocks Entity Teleport should be sent instead.

This packet allows at most 8 blocks movement in any direction, because short range is from -32768 to 32767. And 32768 / (128 * 32) = 8.

Packet ID State Bound To Field Name Field Type Notes
0x27 Play Client Entity ID VarInt
Delta X Short Change in X position as (currentX * 32 - prevX * 32) * 128
Delta Y Short Change in Y position as (currentY * 32 - prevY * 32) * 128
Delta Z Short Change in Z position as (currentZ * 32 - prevZ * 32) * 128
On Ground Boolean

Entity Position and Rotation

This packet is sent by the server when an entity rotates and moves. Since a short range is limited from -32768 to 32767, and movement is offset of fixed-point numbers, this packet allows at most 8 blocks movement in any direction. (-32768 / (32 * 128) == -8)

Packet ID State Bound To Field Name Field Type Notes
0x28 Play Client Entity ID VarInt
Delta X Short Change in X position as (currentX * 32 - prevX * 32) * 128
Delta Y Short Change in Y position as (currentY * 32 - prevY * 32) * 128
Delta Z Short Change in Z position as (currentZ * 32 - prevZ * 32) * 128
Yaw Angle New angle, not a delta
Pitch Angle New angle, not a delta
On Ground Boolean

Entity Rotation

This packet is sent by the server when an entity rotates.

Packet ID State Bound To Field Name Field Type Notes
0x29 Play Client Entity ID VarInt
Yaw Angle New angle, not a delta
Pitch Angle New angle, not a delta
On Ground Boolean

Entity Movement

This packet may be used to initialize an entity.

For player entities, either this packet or any move/look packet is sent every game tick. So the meaning of this packet is basically that the entity did not move/look since the last such packet.

Packet ID State Bound To Field Name Field Type Notes
0x2A Play Client Entity ID VarInt

Vehicle Move (clientbound)

Note that all fields use absolute positioning and do not allow for relative positioning.

Packet ID State Bound To Field Name Field Type Notes
0x2B Play Client X Double Absolute position (X coordinate)
Y Double Absolute position (Y coordinate)
Z Double Absolute position (Z coordinate)
Yaw Float Absolute rotation on the vertical axis, in degrees
Pitch Float Absolute rotation on the horizontal axis, in degrees

Open Book

Sent when a player right clicks with a signed book. This tells the client to open the book GUI.

Packet ID State Bound To Field Name Field Type Notes
0x2C Play Client Hand VarInt enum 0: Main hand, 1: Off hand

Open Window

This is sent to the client when it should open an inventory, such as a chest, workbench, or furnace. This message is not sent anywhere for clients opening their own inventory. For horses, use Open Horse Window.

Packet ID State Bound To Field Name Field Type Notes
0x2D Play Client Window ID VarInt A unique id number for the window to be displayed. Notchian server implementation is a counter, starting at 1.
Window Type VarInt The window type to use for display. Contained in the minecraft:menu regisry; see Inventory for the different values.
Window Title Chat The title of the window

Open Sign Editor

Sent when the client has placed a sign and is allowed to send Update Sign. There must already be a sign at the given location (which the client does not do automatically) - send a Block Change first.

Packet ID State Bound To Field Name Field Type Notes
0x2E Play Client Location Position

Craft Recipe Response

Response to the serverbound packet (Craft Recipe Request), with the same recipe ID. Appears to be used to notify the UI.

Packet ID State Bound To Field Name Field Type Notes
0x2F Play Client Window ID Byte
Recipe Identifier A recipe ID

Player Abilities (clientbound)

The latter 2 floats are used to indicate the field of view and flying speed respectively, while the first byte is used to determine the value of 4 booleans.

Packet ID State Bound To Field Name Field Type Notes
0x30 Play Client Flags Byte Bit field, see below
Flying Speed Float 0.05 by default
Field of View Modifier Float Modifies the field of view, like a speed potion. A Notchian server will use the same value as the movement speed sent in the Entity Properties packet, which defaults to 0.1 for players.

About the flags:

Field Bit
Invulnerable 0x01
Flying 0x02
Allow Flying 0x04
Creative Mode (Instant Break) 0x08

Combat Event

Originally used for metadata for twitch streaming circa 1.8. Now only used to display the game over screen (with enter combat and end combat completely ignored by the Notchain client)

Packet ID State Bound To Field Name Field Type Notes
0x31 Play Client Event VarInt Enum Determines the layout of the remaining packet
Event Field Name
0: enter combat no fields no fields
1: end combat Duration VarInt Length of the combat in ticks.
Entity ID Int ID of the primary opponent of the ended combat, or -1 if there is no obvious primary opponent.
2: entity dead Player ID VarInt Entity ID of the player that died (should match the client's entity ID).
Entity ID Int The killing entity's ID, or -1 if there is no obvious killer.
Message Chat The death message

Player Info

Sent by the server to update the user list (<tab> in the client).

Packet ID State Bound To Field Name Field Type Notes
0x32 Play Client Action VarInt Determines the rest of the Player format after the UUID
Number Of Players VarInt Number of elements in the following array
Player UUID Array UUID
Action Field Name
0: add player Name String (16)
Number Of Properties VarInt Number of elements in the following array
Property Name Array String (32767)
Value String (32767)
Is Signed Boolean
Signature Optional String (32767) Only if Is Signed is true
Gamemode VarInt
Ping VarInt Measured in milliseconds
Has Display Name Boolean
Display Name Optional Chat Only if Has Display Name is true
1: update gamemode Gamemode VarInt
2: update latency Ping VarInt Measured in milliseconds
3: update display name Has Display Name Boolean
Display Name Optional Chat Only send if Has Display Name is true
4: remove player no fields no fields

The Property field looks as in the response of Mojang API#UUID -> Profile + Skin/Cape, except of course using the protocol format instead of JSON. That is, each player will usually have one property with Name “textures” and Value being a base64-encoded JSON string as documented at Mojang API#UUID -> Profile + Skin/Cape. An empty properties array is also acceptable, and will cause clients to display the player with one of the two default skins depending on UUID.

Ping values correspond with icons in the following way:

  • A ping that negative (i.e. not known to the server yet) will result in the no connection icon.
  • A ping under 150 milliseconds will result in 5 bars
  • A ping under 300 milliseconds will result in 4 bars
  • A ping under 600 milliseconds will result in 3 bars
  • A ping under 1000 milliseconds (1 second) will result in 2 bars
  • A ping greater than or equal to 1 second will result in 1 bar.

Face Player

Used to rotate the client player to face the given location or entity (for /teleport [<targets>] <x> <y> <z> facing).

Packet ID State Bound To Field Name Field Type Notes
0x33 Play Client
Feet/eyes VarInt enum Values are feet=0, eyes=1. If set to eyes, aims using the head position; otherwise aims using the feet position.
Target x Double x coordinate of the point to face towards
Target y Double y coordinate of the point to face towards
Target z Double z coordinate of the point to face towards
Is entity Boolean If true, additional information about an entity is provided.
Entity ID Optional VarInt Only if is entity is true — the entity to face towards
Entity feet/eyes Optional VarInt enum Whether to look at the entity's eyes or feet. Same values and meanings as before, just for the entity's head/feet.

If the entity given by entity ID cannot be found, this packet should be treated as if is entity was false.

Player Position And Look (clientbound)

Updates the player's position on the server. This packet will also close the “Downloading Terrain” screen when joining/respawning.

If the distance between the last known position of the player on the server and the new position set by this packet is greater than 100 meters, the client will be kicked for “You moved too quickly :( (Hacking?)”.

Also if the fixed-point number of X or Z is set greater than 3.2E7D the client will be kicked for “Illegal position”.

Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0, -1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.

Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.

Packet ID State Bound To Field Name Field Type Notes
0x34 Play Client X Double Absolute or relative position, depending on Flags
Y Double Absolute or relative position, depending on Flags
Z Double Absolute or relative position, depending on Flags
Yaw Float Absolute or relative rotation on the X axis, in degrees
Pitch Float Absolute or relative rotation on the Y axis, in degrees
Flags Byte Bit field, see below
Teleport ID VarInt Client should confirm this packet with Teleport Confirm containing the same Teleport ID

About the Flags field:

<Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
Field Bit
X 0x01
Y 0x02
Z 0x04
Y_ROT 0x08
X_ROT 0x10

Unlock Recipes

Packet ID State Bound To Field Name Field Type Notes
0x35 Play Client
Action VarInt 0: init, 1: add, 2: remove
Crafting Recipe Book Open Boolean If true, then the crafting recipe book will be open when the player opens its inventory.
Crafting Recipe Book Filter Active Boolean If true, then the filtering option is active when the players opens its inventory.
Smelting Recipe Book Open Boolean If true, then the smelting recipe book will be open when the player opens its inventory.
Smelting Recipe Book Filter Active Boolean If true, then the filtering option is active when the players opens its inventory.
Blast Furance Recipe Book Open Boolean If true, then the blast furnace recipe book will be open when the player opens its inventory.
Blast Furance Recipe Book Filter Active Boolean If true, then the filtering option is active when the players opens its inventory.
Smoker Recipe Book Open Boolean If true, then the smoker recipe book will be open when the player opens its inventory.
Smoker Recipe Book Filter Active Boolean If true, then the filtering option is active when the players opens its inventory.
Array size 1 VarInt Number of elements in the following array
Recipe IDs Array of Identifier
Array size 2 Optional VarInt Number of elements in the following array, only present if mode is 0 (init)
Recipe IDs Optional Array of Identifier, only present if mode is 0 (init)

Action:

  • 0 (init) = All the recipes in the list 2 will added to the recipe book. All the recipes in list 1 will be tagged as displayed, recipes that aren't tagged will be shown in the notification.
  • 1 (add) = All the recipes in the list are added and their icon will be shown in the notification.
  • 2 (remove) = Remove all the recipes in the list. This allows them to re-displayed when they are readded.

Destroy Entities

Sent by the server when a list of entities is to be destroyed on the client.

Packet ID State Bound To Field Name Field Type Notes
0x36 Play Client Count VarInt Number of elements in the following array
Entity IDs Array of VarInt The list of entities of destroy

Remove Entity Effect

Packet ID State Bound To Field Name Field Type Notes
0x37 Play Client Entity ID VarInt
Effect ID Byte See this table

Resource Pack Send

Packet ID State Bound To Field Name Field Type Notes
0x38 Play Client URL String (32767) The URL to the resource pack.
Hash String (40) A 40 character hexadecimal and lowercase SHA-1 hash of the resource pack file. (must be lower case in order to work)
If it's not a 40 character hexadecimal string, the client will not use it for hash verification and likely waste bandwidth — but it will still treat it as a unique id

Respawn

To change the player's dimension (overworld/nether/end), send them a respawn packet with the appropriate dimension, followed by prechunks/chunks for the new dimension, and finally a position and look packet. You do not need to unload chunks, the client will do it automatically.

Packet ID State Bound To Field Name Field Type Notes
0x39 Play Client Dimension NBT Tag Compound Valid dimensions are defined per dimension registry sent in Join Game
World Name Identifier Name of the world being spawned into
Hashed seed Long First 8 bytes of the SHA-256 hash of the world's seed.
Gamemode Unsigned Byte 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included
Previous Gamemode Unsigned Byte 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. (More information needed)
Is Debug Boolean True if the world is a debug mode world; debug mode worlds cannot be modified and have predefined blocks
Is Flat Boolean True if the world is a superflat world; flat worlds have different void fog and a horizon at y=0 instead of y=63
Copy metadata Boolean If false, metadata is reset on the respawned player entity. Set to true for dimension changes (including the dimension change triggered by sending client status perform respawn to exit the end poem/credits), and false for normal respawns.
Huh.png The following information needs to be added to this page:
Does the new World Name field resolve this same-dimension issue?

Warning.png Avoid changing player's dimension to same dimension they were already in unless they are dead. If you change the dimension to one they are already in, weird bugs can occur, such as the player being unable to attack other players in new world (until they die and respawn).

If you must respawn a player in the same dimension without killing them, send two respawn packets, one to a different world and then another to the world you want. You do not need to complete the first respawn; it only matters that you send two packets.

Entity Head Look

Changes the direction an entity's head is facing.

While sending the Entity Look packet changes the vertical rotation of the head, sending this packet appears to be necessary to rotate the head horizontally.

Packet ID State Bound To Field Name Field Type Notes
0x3A Play Client Entity ID VarInt
Head Yaw Angle New angle, not a delta

Multi Block Change

Fired whenever 2 or more blocks are changed within the same chunk on the same tick.

Warning.png Changing blocks in chunks not loaded by the client is unsafe (see note on Block Change).

Packet ID State Bound To Field Name Field Type Notes
0x3B Play Client Chunk section position Long Chunk section coordinate (encoded chunk x and z with each 22 bits, and section y with 20 bits, from left to right)
Boolean Always inverse the preceding Update Light packet's "Trust Edges" bool
Blocks array size VarInt Number of elements in the following array
Blocks Array of VarLong Each entry is composed of the block id, shifted right by 12, and the relative block position in the chunk section (4 bits for x, z, and y, from left to right).

Chunk section position is encoded:

((sectionX & 0x3FFFFF) << 42) | (sectionY & 0xFFFFF) | ((sectionZ & 0x3FFFFF) << 20);

and decoded:

sectionX = long >> 42;
sectionY = long << 44 >> 44;
sectionZ = long << 22 >> 42;

Blocks are encoded:

blockRawId << 12 | (blockLocalX << 8 | blockLocalY << 4 | blockLocalZ)
//Uses the local position of the given block position relative to its respective chunk section

Select Advancement Tab

Sent by the server to indicate that the client should switch advancement tab. Sent either when the client switches tab in the GUI or when an advancement in another tab is made.

Packet ID State Bound To Field Name Field Type Notes
0x3C Play Client Has id Boolean Indicates if the next field is present
Optional Identifier String (32767) See below

The Identifier can be one of the following:

Optional Identifier
minecraft:story/root
minecraft:nether/root
minecraft:end/root
minecraft:adventure/root
minecraft:husbandry/root

If no or an invalid identifier is sent, the client will switch to the first tab in the GUI.

World Border

Packet ID State Bound To Field Name Field Type Notes
0x3D Play Client Action VarInt Enum Determines the format of the rest of the packet
Action Field Name
0: set size Diameter Double Length of a single side of the world border, in meters
1: lerp size Old Diameter Double Current length of a single side of the world border, in meters
New Diameter Double Target length of a single side of the world border, in meters
Speed VarLong Number of real-time milliseconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.
2: set center X Double
Z Double
3: initialize X Double
Z Double
Old Diameter Double Current length of a single side of the world border, in meters
New Diameter Double Target length of a single side of the world border, in meters
Speed VarLong Number of real-time milliseconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.
Portal Teleport Boundary VarInt Resulting coordinates from a portal teleport are limited to ±value. Usually 29999984.
Warning Time VarInt In seconds as set by /worldborder warning time
Warning Blocks VarInt In meters
4: set warning time Warning Time VarInt In seconds as set by /worldborder warning time
5: set warning blocks Warning Blocks VarInt In meters

The Notchian client determines how solid to display the warning by comparing to whichever is higher, the warning distance or whichever is lower, the distance from the current diameter to the target diameter or the place the border will be after warningTime seconds. In pseudocode:

distance = max(min(resizeSpeed * 1000 * warningTime, abs(targetDiameter - currentDiameter)), warningDistance);
if (playerDistance < distance) {
    warning = 1.0 - playerDistance / distance;
} else {
    warning = 0.0;
}

Camera

Sets the entity that the player renders from. This is normally used when the player left-clicks an entity while in spectator mode.

The player's camera will move with the entity and look where it is looking. The entity is often another player, but can be any type of entity. The player is unable to move this entity (move packets will act as if they are coming from the other entity).

If the given entity is not loaded by the player, this packet is ignored. To return control to the player, send this packet with their entity ID.

The Notchian server resets this (sends it back to the default entity) whenever the spectated entity is killed or the player sneaks, but only if they were spectating an entity. It also sends this packet whenever the player switches out of spectator mode (even if they weren't spectating an entity).

Packet ID State Bound To Field Name Field Type Notes
0x3E Play Client Camera ID VarInt ID of the entity to set the client's camera to

The notchian also loads certain shaders for given entities:

  • Creeper → shaders/post/creeper.json
  • Spider (and cave spider) → shaders/post/spider.json
  • Enderman → shaders/post/invert.json
  • Anything else → the current shader is unloaded

Held Item Change (clientbound)

Sent to change the player's slot selection.

Packet ID State Bound To Field Name Field Type Notes
0x3F Play Client Slot Byte The slot which the player has selected (0–8)

Update View Position

Huh.png The following information needs to be added to this page:
Why is this even needed? Is there a better name for it? My guess is that it's something to do with logical behavior with latency, but it still seems weird.

Updates the client's location. This is used to determine what chunks should remain loaded and if a chunk load should be ignored; chunks outside of the view distance may be unloaded.

Sent whenever the player moves across a chunk border horizontally, and also (according to testing) for any integer change in the vertical axis, even if it doesn't go across a chunk section border.

Packet ID State Bound To Field Name Field Type Notes
0x40 Play Client Chunk X VarInt Chunk X coordinate of the player's position
Chunk Z VarInt Chunk Z coordinate of the player's position

Update View Distance

Sent by the integrated singleplayer server when changing render distance. Does not appear to be used by the dedicated server, as view-distance in server.properties cannot be changed at runtime.

Packet ID State Bound To Field Name Field Type Notes
0x41 Play Client View Distance VarInt Render distance (2-32)

Spawn Position

Sent by the server after login to specify the coordinates of the spawn point (the point at which players spawn at, and which the compass points to). It can be sent at any time to update the point compasses point at.

Packet ID State Bound To Field Name Field Type Notes
0x42 Play Client Location Position Spawn location

Display Scoreboard

This is sent to the client when it should display a scoreboard.

Packet ID State Bound To Field Name Field Type Notes
0x43 Play Client Position Byte The position of the scoreboard. 0: list, 1: sidebar, 2: below name, 3 - 18: team specific sidebar, indexed as 3 + team color.
Score Name String (16) The unique name for the scoreboard to be displayed.

Entity Metadata

Updates one or more metadata properties for an existing entity. Any properties not included in the Metadata field are left unchanged.

Packet ID State Bound To Field Name Field Type Notes
0x44 Play Client Entity ID VarInt
Metadata Entity Metadata

Attach Entity

This packet is sent when an entity has been leashed to another entity.

Packet ID State Bound To Field Name Field Type Notes
0x45 Play Client Attached Entity ID Int Attached entity's EID
Holding Entity ID Int ID of the entity holding the lead. Set to -1 to detach.

Entity Velocity

Velocity is believed to be in units of 1/8000 of a block per server tick (50ms); for example, -1343 would move (-1343 / 8000) = −0.167875 blocks per tick (or −3,3575 blocks per second).

Packet ID State Bound To Field Name Field Type Notes
0x46 Play Client Entity ID VarInt
Velocity X Short Velocity on the X axis
Velocity Y Short Velocity on the Y axis
Velocity Z Short Velocity on the Z axis

Entity Equipment

Packet ID State Bound To Field Name Field Type Notes
0x47 Play Client Entity ID VarInt Entity's EID
Equipment Slot Array Byte Enum Equipment slot. 0: main hand, 1: off hand, 2–5: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet). Also has the top bit set if another entry follows, and otherwise unset if this is the last item in the array.
Item Slot

Set Experience

Sent by the server when the client should change experience levels.

Packet ID State Bound To Field Name Field Type Notes
0x48 Play Client Experience bar Float Between 0 and 1
Level VarInt
Total Experience VarInt See Experience#Leveling up on the Minecraft Wiki for Total Experience to Level conversion

Update Health

Sent by the server to update/set the health of the player it is sent to.

Food saturation acts as a food “overcharge”. Food values will not decrease while the saturation is over zero. Players logging in automatically get a saturation of 5.0. Eating food increases the saturation as well as the food bar.

Packet ID State Bound To Field Name Field Type Notes
0x49 Play Client Health Float 0 or less = dead, 20 = full HP
Food VarInt 0–20
Food Saturation Float Seems to vary from 0.0 to 5.0 in integer increments

Scoreboard Objective

This is sent to the client when it should create a new scoreboard objective or remove one.

Packet ID State Bound To Field Name Field Type Notes
0x4A Play Client Objective Name String (16) An unique name for the objective
Mode Byte 0 to create the scoreboard. 1 to remove the scoreboard. 2 to update the display text.
Objective Value Optional Chat Only if mode is 0 or 2. The text to be displayed for the score
Type Optional VarInt enum Only if mode is 0 or 2. 0 = "integer", 1 = "hearts".

Set Passengers

Packet ID State Bound To Field Name Field Type Notes
0x4B Play Client Entity ID VarInt Vehicle's EID
Passenger Count VarInt Number of elements in the following array
Passengers Array of VarInt EIDs of entity's passengers

Teams

Creates and updates teams.

Packet ID State Bound To Field Name Field Type Notes
0x4C Play Client Team Name String (16) A unique name for the team. (Shared with scoreboard).
Mode Byte Determines the layout of the remaining packet
0: create team Team Display Name Chat
Friendly Flags Byte Bit mask. 0x01: Allow friendly fire, 0x02: can see invisible players on same team
Name Tag Visibility String Enum (32) always, hideForOtherTeams, hideForOwnTeam, never
Collision Rule String Enum (32) always, pushOtherTeams, pushOwnTeam, never
Team Color VarInt enum Used to color the name of players on the team; see below
Team Prefix Chat Displayed before the names of players that are part of this team
Team Suffix Chat Displayed after the names of players that are part of this team
Entity Count VarInt Number of elements in the following array
Entities Array of String (40) Identifiers for the entities in this team. For players, this is their username; for other entities, it is their UUID.
1: remove team no fields no fields
2: update team info Team Display Name Chat
Friendly Flags Byte Bit mask. 0x01: Allow friendly fire, 0x02: can see invisible entities on same team
Name Tag Visibility String Enum (32) always, hideForOtherTeams, hideForOwnTeam, never
Collision Rule String Enum (32) always, pushOtherTeams, pushOwnTeam, never
Team Color VarInt enum Used to color the name of players on the team; see below
Team Prefix Chat Displayed before the names of players that are part of this team
Team Suffix Chat Displayed after the names of players that are part of this team
3: add players to team Entity Count VarInt Number of elements in the following array
Entities Array of String (40) Identifiers for the entities added. For players, this is their username; for other entities, it is their UUID.
4: remove players from team Entity Count VarInt Number of elements in the following array
Entities Array of String (40) Identifiers for the entities removed. For players, this is their username; for other entities, it is their UUID.

Team Color: The color of a team defines how the names of the team members are visualized; any formatting code can be used. The following table lists all the possible values.

ID Formatting
0-15 Color formatting, same values as Chat colors.
16 Obfuscated
17 Bold
18 Strikethrough
19 Underlined
20 Italic
21 Reset

Update Score

This is sent to the client when it should update a scoreboard item.

Packet ID State Bound To Field Name Field Type Notes
0x4D Play Client Entity Name String (40) The entity whose score this is. For players, this is their username; for other entities, it is their UUID.
Action Byte 0 to create/update an item. 1 to remove an item.
Objective Name String (16) The name of the objective the score belongs to
Value Optional VarInt The score to be displayed next to the entry. Only sent when Action does not equal 1.

Time Update

Time is based on ticks, where 20 ticks happen every second. There are 24000 ticks in a day, making Minecraft days exactly 20 minutes long.

The time of day is based on the timestamp modulo 24000. 0 is sunrise, 6000 is noon, 12000 is sunset, and 18000 is midnight.

The default SMP server increments the time by 20 every second.

Packet ID State Bound To Field Name Field Type Notes
0x4E Play Client World Age Long In ticks; not changed by server commands
Time of day Long The world (or region) time, in ticks. If negative the sun will stop moving at the Math.abs of the time

Title

Packet ID State Bound To Field Name Field Type Notes
0x4F Play Client Action VarInt Enum
Action Field Name
0: set title Title Text Chat
1: set subtitle Subtitle Text Chat
2: set action bar Action bar text Chat Displays a message above the hotbar (the same as position 2 in Chat Message (clientbound), except that it correctly renders formatted chat. See MC-119145 for more information.)
3: set times and display Fade In Int Ticks to spend fading in
Stay Int Ticks to keep the title displayed
Fade Out Int Ticks to spend out, not when to start fading out
4: hide no fields no fields
5: reset no fields no fields

“Hide” makes the title disappear, but if you run times again the same title will appear. “Reset” erases the text.

The title is visible on screen for Fade In + Stay + Fade Out ticks.

Entity Sound Effect

Plays a sound effect from an entity.

Packet ID State Bound To Field Name Field Type Notes
0x50 Play Client Sound ID VarInt ID of hardcoded sound event (events as of 1.16.3)
Sound Category VarInt Enum The category that this sound will be played from (current categories)
Entity ID VarInt
Volume Float 1.0 is 100%, capped between 0.0 and 1.0 by Notchian clients
Pitch Float Float between 0.5 and 2.0 by Notchian clients

Sound Effect

This packet is used to play a number of hardcoded sound events. For custom sounds, use Named Sound Effect.

Warning.png Numeric sound effect IDs are liable to change between versions

Packet ID State Bound To Field Name Field Type Notes
0x51 Play Client Sound ID VarInt ID of hardcoded sound event (events as of 1.16.3)
Sound Category VarInt Enum The category that this sound will be played from (current categories)
Effect Position X Int Effect X multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part)
Effect Position Y Int Effect Y multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part)
Effect Position Z Int Effect Z multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part)
Volume Float 1.0 is 100%, capped between 0.0 and 1.0 by Notchian clients
Pitch Float Float between 0.5 and 2.0 by Notchian clients

Stop Sound

Packet ID State Bound To Field Name Field Type Notes
0x52 Play Client Flags Byte Controls which fields are present.
Source Optional VarInt enum Only if flags is 3 or 1 (bit mask 0x1). See below. If not present, then sounds from all sources are cleared.
Sound Optional Identifier Only if flags is 2 or 3 (bit mask 0x2). A sound effect name, see Named Sound Effect. If not present, then all sounds are cleared.

Categories:

Name Value
master 0
music 1
record 2
weather 3
block 4
hostile 5
neutral 6
player 7
ambient 8
voice 9

Player List Header And Footer

This packet may be used by custom servers to display additional information above/below the player list. It is never sent by the Notchian server.

Packet ID State Bound To Field Name Field Type Notes
0x53 Play Client Header Chat To remove the header, send a empty text component: {"text":""}
Footer Chat To remove the footer, send a empty text component: {"text":""}

NBT Query Response

Sent in response to Query Block NBT or Query Entity NBT.

Packet ID State Bound To Field Name Field Type Notes
0x54 Play Client Transaction ID VarInt Can be compared to the one sent in the original query packet.
NBT NBT Tag The NBT of the block or entity. May be a TAG_END (0) in which case no NBT is present.

Collect Item

Sent by the server when someone picks up an item lying on the ground — its sole purpose appears to be the animation of the item flying towards you. It doesn't destroy the entity in the client memory, and it doesn't add it to your inventory. The server only checks for items to be picked up after each Player Position (and Player Position And Look) packet sent by the client. The collector entity can be any entity; it does not have to be a player. The collected entity also can be any entity, but the Notchian server only uses this for items, experience orbs, and the different varieties of arrows.

Packet ID State Bound To Field Name Field Type Notes
0x55 Play Client Collected Entity ID VarInt
Collector Entity ID VarInt
Pickup Item Count VarInt Seems to be 1 for XP orbs, otherwise the number of items in the stack.

Entity Teleport

This packet is sent by the server when an entity moves more than 8 blocks.

Packet ID State Bound To Field Name Field Type Notes
0x56 Play Client Entity ID VarInt
X Double
Y Double
Z Double
Yaw Angle New angle, not a delta
Pitch Angle New angle, not a delta
On Ground Boolean

Advancements

Packet ID State Bound To Field Name Field Type Notes
0x57 Play Client Reset/Clear Boolean Whether to reset/clear the current advancements
Mapping size VarInt Size of the following array
Advancement mapping Key Array Identifier The identifier of the advancement
Value Advancement See below
List size VarInt Size of the following array
Identifiers Array of Identifier The identifiers of the advancements that should be removed
Progress size VarInt Size of the following array
Progress mapping Key Array Identifier The identifier of the advancement
Value Advancement progress See below

Advancement structure:

Field Name Field Type Notes
Has parent Boolean Indicates whether the next field exists.
Parent id Optional Identifier The identifier of the parent advancement.
Has display Boolean Indicates whether the next field exists
Display data Optional advancement display See below.
Number of criteria VarInt Size of the following array
Criteria Key Array Identifier The identifier of the criterion
Value Void There is no content written here. Perhaps this will be expanded in the future?
Array length VarInt Number of arrays in the following array
Requirements Array length 2 Array VarInt Number of elements in the following array
Requirement Array of String Array of required criteria

Advancement display:

Field Name Field Type Notes
Title Chat
Description Chat
Icon Slot
Frame type VarInt enum 0 = task, 1 = challenge, 2 = goal
Flags Integer 0x1: has background texture; 0x2: show_toast; 0x4: hidden
Background texture Optional Identifier Background texture location. Only if flags indicates it.
X coord Float
Y coord Float

Advancement progress:

Field Name Field Type Notes
Size VarInt Size of the following array
Criteria Criterion identifier Array Identifier The identifier of the criterion.
Criterion progress Criterion progress

Criterion progress:

Field Name Field Type Notes
Achieved Boolean If true, next field is present
Date of achieving Optional Long As returned by Date.getTime

Entity Properties

Sets attributes on the given entity.

Packet ID State Bound To Field Name Field Type Notes
0x58 Play Client Entity ID VarInt
Number Of Properties Int Number of elements in the following array
Property Key Array Identifier See below
Value Double See below
Number Of Modifiers VarInt Number of elements in the following array
Modifiers Array of Modifier Data See Attribute#Modifiers. Modifier Data defined below.

Known Key values (see also Attribute#Modifiers):

Key Default Min Max Label
generic.max_health 20.0 0.0 1024.0 Max Health
generic.follow_range 32.0 0.0 2048.0 Follow Range
generic.knockback_resistance 0.0 0.0 1.0 Knockback Resistance
generic.movement_speed 0.7 0.0 1024.0 Movement Speed
generic.attack_damage 2.0 0.0 2048.0 Attack Damage
generic.attack_speed 4.0 0.0 1024.0 Attack Speed
generic.flying_speed 0.4 0.0 1024.0 Flying Speed
generic.armor 0.0 0.0 30.0 Armor
generic.armor_toughness 0.0 0.0 20.0 Armor Toughness
generic.attack_knockback 0.0 0.0 5.0
generic.luck 0.0 -1024.0 1024.0 Luck
horse.jump_strength 0.7 0.0 2.0 Jump Strength
zombie.spawn_reinforcements 0.0 0.0 1.0 Spawn Reinforcements Chance
generic.reachDistance 5.0 0.0 1024.0 Player Reach Distance (Forge only)
forge.swimSpeed 1.0 0.0 1024.0 Swimming Speed (Forge only)

Unknown attributes will cause a game crash (MC-150405) due to the default minimum being larger than the default value.

Modifier Data structure:

Field Name Field Type Notes
UUID UUID
Amount Double May be positive or negative
Operation Byte See below

The operation controls how the base value of the modifier is changed.

  • 0: Add/subtract amount
  • 1: Add/subtract amount percent of the current value
  • 2: Multiply by amount percent

All of the 0's are applied first, and then the 1's, and then the 2's.

Entity Effect

Packet ID State Bound To Field Name Field Type Notes
0x59 Play Client Entity ID VarInt
Effect ID Byte See this table
Amplifier Byte Notchian client displays effect level as Amplifier + 1
Duration VarInt Duration in ticks.
Flags Byte Bit field, see below.

Within flags:

  • 0x01: Is ambient - was the effect spawned from a beacon? All beacon-generated effects are ambient. Ambient effects use a different icon in the HUD (blue border rather than gray). If all effects on an entity are ambient, the "Is potion effect ambient" living metadata field should be set to true. Usually should not be enabled.
  • 0x02: Show particles - should all particles from this effect be hidden? Effects with particles hidden are not included in the calculation of the effect color, and are not rendered on the HUD (but are still rendered within the inventory). Usually should be enabled.
  • 0x04: Show icon - should the icon be displayed on the client? Usually should be enabled.

Declare Recipes

Packet ID State Bound To Field Name Field Type Notes
0x5A Play Client Num Recipes VarInt Number of elements in the following array
Recipe Type Array Identifier The recipe type, see below
Recipe ID String
Data Optional, varies Additional data for the recipe. For some types, there will be no data.

Recipe types:

Type Description Data
crafting_shapeless Shapeless crafting recipe. All items in the ingredient list must be present, but in any order/slot. As follows:
Name Type Description
Group String Used to group similar recipes together in the recipe book. Tag is present in recipe JSON.
Ingredient count VarInt Number of elements in the following array
Ingredients Array of Ingredient
Result Slot
crafting_shaped Shaped crafting recipe. All items must be present in the same pattern (which may be flipped horizontally or translated) As follows:
Name Type Description
Width VarInt
Height VarInt
Group String Used to group similar recipes together in the recipe book. Tag is present in recipe JSON.
Ingredients Array of Ingredient Length is width * height. Indexed by x + (y * width).
Result Slot
crafting_special_armordye Recipe for dying leather armor None
crafting_special_bookcloning Recipe for copying contents of written books
crafting_special_mapcloning Recipe for copying maps
crafting_special_mapextending Recipe for adding paper to maps
crafting_special_firework_rocket Recipe for making firework rockets
crafting_special_firework_star Recipe for making firework stars
crafting_special_firework_star_fade Recipe for making firework stars fade between multiple colors
crafting_special_repairitem Recipe for repairing items via crafting
crafting_special_tippedarrow Recipe for crafting tipped arrows
crafting_special_bannerduplicate Recipe for copying banner patterns
crafting_special_banneraddpattern Recipe for adding patterns to banners
crafting_special_shielddecoration Recipe for applying a banner's pattern to a shield
crafting_special_shulkerboxcoloring Recipe for recoloring a shulker box
smelting Smelting recipe As follows:
Name Type Description
Group String Used to group similar recipes together in the recipe book.
Ingredient Ingredient
Result Slot
Experience Float
Cooking time VarInt
blasting Blast furnace recipe
smoking Smoker recipe
campfire_cooking Campfire recipe
stonecutting Stonecutter recipe As follows:
Name Type Description
Group String Used to group similar recipes together in the recipe book. Tag is present in recipe JSON.
Ingredient Ingredient
Result Slot
smithing Smithing table recipe As follows:
Name Type Description
Base Ingredient First item
Addition Ingredient Second item
Result Slot

Ingredient is defined as:

Name Type Description
Count VarInt Number of elements in the following array
Items Array of Slot Any item in this array may be used for the recipe. The count of each item should be 1.

Tags

Packet ID State Bound To Field Name Field Type Notes
0x5B Play Client Block Tags (See below) IDs are block IDs
Item Tags (See below) IDs are item IDs
Fluid Tags (See below) IDs are fluid IDs
Entity Tags (See below) IDs are entity IDs

Tags look like:

Field Name Field Type Notes
Length VarInt Number of elements in the following array
Tags Tag name Array Identifier
Count VarInt Number of elements in the following array
Entries Array of VarInt Numeric ID of the block/item.

Serverbound

Teleport Confirm

Sent by client as confirmation of Player Position And Look.

Packet ID State Bound To Field Name Field Type Notes
0x00 Play Server Teleport ID VarInt The ID given by the Player Position And Look packet

Query Block NBT

Used when Shift+F3+I is pressed while looking at a block.

Packet ID State Bound To Field Name Field Type Notes
0x01 Play Server Transaction ID VarInt An incremental ID so that the client can verify that the response matches.
Location Position The location of the block to check.

Query Entity NBT

Used when Shift+F3+I is pressed while looking at an entity.

Packet ID State Bound To Field Name Field Type Notes
0x0D Play Server Transaction ID VarInt An incremental ID so that the client can verify that the response matches.
Entity ID VarInt The ID of the entity to query.

Set Difficulty

Must have at least op level 2 to use. Appears to only be used on singleplayer; the difficulty buttons are still disabled in multiplayer.

Packet ID State Bound To Field Name Field Type Notes
0x02 Play Server New difficulty Byte 0: peaceful, 1: easy, 2: normal, 3: hard

Chat Message (serverbound)

Used to send a chat message to the server. The message may not be longer than 256 characters or else the server will kick the client.

If the message starts with a /, the server will attempt to interpret it as a command. Otherwise, the server will broadcast the same chat message to all players on the server (including the player that sent the message), prepended with player's name. Specifically, it will respond with a translate chat component, "chat.type.text" with the first parameter set to the display name of the player (including some chat component logic to support clicking the name to send a PM) and the second parameter set to the message. See processing chat for more information.

Packet ID State Bound To Field Name Field Type Notes
0x03 Play Server Message String (256) The client sends the raw input, not a Chat component

Client Status

Packet ID State Bound To Field Name Field Type Notes
0x04 Play Server Action ID VarInt Enum See below

Action ID values:

Action ID Action Notes
0 Perform respawn Sent when the client is ready to complete login and when the client is ready to respawn after death.
1 Request stats Sent when the client opens the Statistics menu

Client Settings

Sent when the player connects, or when settings are changed.

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Server Locale String (16) e.g. en_GB
View Distance Byte Client-side render distance, in chunks
Chat Mode VarInt Enum 0: enabled, 1: commands only, 2: hidden. See processing chat for more information.
Chat Colors Boolean “Colors” multiplayer setting
Displayed Skin Parts Unsigned Byte Bit mask, see below
Main Hand VarInt Enum 0: Left, 1: Right

Displayed Skin Parts flags:

  • Bit 0 (0x01): Cape enabled
  • Bit 1 (0x02): Jacket enabled
  • Bit 2 (0x04): Left Sleeve enabled
  • Bit 3 (0x08): Right Sleeve enabled
  • Bit 4 (0x10): Left Pants Leg enabled
  • Bit 5 (0x20): Right Pants Leg enabled
  • Bit 6 (0x40): Hat enabled

The most significant bit (bit 7, 0x80) appears to be unused.

Tab-Complete (serverbound)

Sent when the client needs to tab-complete a minecraft:ask_server suggestion type.

Packet ID State Bound To Field Name Field Type Notes
0x06 Play Server Transaction Id VarInt The id received in the tab completion request packet, must match or the client will ignore this packet. Client generates this and increments it each time it sends another tab completion that doesn't get a response.
Text String (32500) All text behind the cursor without the / (e.g. to the left of the cursor in left-to-right languages like English)

Window Confirmation (serverbound)

If a confirmation sent by the client was not accepted, the server will reply with a Window Confirmation (clientbound) packet with the Accepted field set to false. When this happens, the client must send this packet to apologize (as with movement), otherwise the server ignores any successive confirmations.

Packet ID State Bound To Field Name Field Type Notes
0x07 Play Server Window ID Byte The ID of the window that the action occurred in
Action Number Short Every action that is to be accepted has a unique number. This number is an incrementing integer (starting at 1) with separate counts for each window ID.
Accepted Boolean Whether the action was accepted

Click Window Button

Used when clicking on window buttons. Until 1.14, this was only used by enchantment tables.

Packet ID State Bound To Field Name Field Type Notes
0x08 Play Server Window ID Byte The ID of the window sent by Open Window
Button ID Byte Meaning depends on window type; see below
Window type ID Meaning
Enchantment Table 0 Topmost enchantment
1 Middle enchantment
2 Bottom enchantment
Lectern 1 Previous page (which does give a redstone output)
2 Next page
3 Take Book
100+page Opened page number - 100 + number
Stonecutter Recipe button number - 4*row + col. Depends on the item.
Loom Recipe button number - 4*row + col. Depends on the item.

Click Window

This packet is sent by the player when it clicks on a slot in a window.

Packet ID State Bound To Field Name Field Type Notes
0x09 Play Server Window ID Unsigned Byte The ID of the window which was clicked. 0 for player inventory.
Slot Short The clicked slot number, see below
Button Byte The button used in the click, see below
Action Number Short A unique number for the action, implemented by Notchian as a counter, starting at 1 (different counter for every window ID). Used by the server to send back a Confirm Transaction (clientbound).
Mode VarInt Enum Inventory operation mode, see below
Clicked item Slot The clicked slot. Has to be empty (item ID = -1) for drop mode.

See Inventory for further information about how slots are indexed.

When right-clicking on a stack of items, half the stack will be picked up and half left in the slot. If the stack is an odd number, the half left in the slot will be smaller of the amounts.

The distinct type of click performed by the client is determined by the combination of the Mode and Button fields.

Mode Button Slot Trigger
0 0 Normal Left mouse click
1 Normal Right mouse click
1 0 Normal Shift + left mouse click
1 Normal Shift + right mouse click (identical behavior)
2 0 Normal Number key 1
1 Normal Number key 2
2 Normal Number key 3
8 Normal Number key 9
3 2 Normal Middle click, only defined for creative players in non-player inventories.
4 0 Normal* Drop key (Q) (* Clicked item is different, see above)
1 Normal* Ctrl + Drop key (Ctrl-Q) (drops full stack)
0 -999 Left click outside inventory holding nothing (no-op)
1 -999 Right click outside inventory holding nothing (no-op)
5 0 -999 Starting left mouse drag
4 -999 Starting right mouse drag
8 -999 Starting middle mouse drag, only defined for creative players in non-player inventories. (Note: the vanilla client will still incorrectly send this for non-creative players - see MC-46584)
1 Normal Add slot for left-mouse drag
5 Normal Add slot for right-mouse drag
9 Normal Add slot for middle-mouse drag, only defined for creative players in non-player inventories. (Note: the vanilla client will still incorrectly send this for non-creative players - see MC-46584)
2 -999 Ending left mouse drag
6 -999 Ending right mouse drag
10 -999 Ending middle mouse drag, only defined for creative players in non-player inventories. (Note: the vanilla client will still incorrectly send this for non-creative players - see MC-46584)
6 0 Normal Double click

Starting from version 1.5, “painting mode” is available for use in inventory windows. It is done by picking up stack of something (more than 1 item), then holding mouse button (left, right or middle) and dragging held stack over empty (or same type in case of right button) slots. In that case client sends the following to server after mouse button release (omitting first pickup packet which is sent as usual):

  1. packet with mode 5, slot -999, button (0 for left | 4 for right);
  2. packet for every slot painted on, mode is still 5, button (1 | 5);
  3. packet with mode 5, slot -999, button (2 | 6);

If any of the painting packets other than the “progress” ones are sent out of order (for example, a start, some slots, then another start; or a left-click in the middle) the painting status will be reset.

The server will send back a Confirm Transaction packet. If the click was not accepted, the client must send a matching serverbound confirm transaction packet before sending more Click Window packets, otherwise the server will reject them silently. The Notchian server also sends a Window Items packet for the open window and Set Slot packets for the clicked and cursor slot, but only when the click was not accepted, probably to resynchronize client and server.

Close Window (serverbound)

This packet is sent by the client when closing a window.

Notchian clients send a Close Window packet with Window ID 0 to close their inventory even though there is never an Open Window packet for the inventory.

Packet ID State Bound To Field Name Field Type Notes
0x0A Play Server Window ID Unsigned Byte This is the ID of the window that was closed. 0 for player inventory.

Plugin Message (serverbound)

Main article: Plugin channels

Mods and plugins can use this to send their data. Minecraft itself uses some plugin channels. These internal channels are in the minecraft namespace.

More documentation on this: http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/

Note that the length of Data is known only from the packet length, since the packet has no length field of any kind.

Packet ID State Bound To Field Name Field Type Notes
0x0B Play Server Channel Identifier Name of the plugin channel used to send the data
Data Byte Array Any data, depending on the channel. minecraft: channels are documented here. The length of this array must be inferred from the packet length.

Edit Book

Packet ID State Bound To Field Name Field Type Notes
0x0C Play Server New book Slot
Is signing Boolean True if the player is signing the book; false if the player is saving a draft.
Hand VarInt enum 0: Main hand, 1: Off hand

When editing a draft, the NBT section of the Slot contains this:

TAG_Compound(''): 1 entry
{
  TAG_List('pages'): 2 entries
  {
    TAG_String(0): 'Something on Page 1'
    TAG_String(1): 'Something on Page 2'
  }
}

When signing the book, it instead looks like this:

TAG_Compound(''): 3 entires
{
  TAG_String('author'): 'Steve'
  TAG_String('title'): 'A Wonderful Book'
  TAG_List('pages'): 2 entries
  {
    TAG_String(0): 'Something on Page 1'
    TAG_String(1): 'Something on Page 2'
  }
}

Interact Entity

This packet is sent from the client to the server when the client attacks or right-clicks another entity (a player, minecart, etc).

A Notchian server only accepts this packet if the entity being attacked/used is visible without obstruction and within a 4-unit radius of the player's position.

Note that middle-click in creative mode is interpreted by the client and sent as a Creative Inventory Action packet instead.

Packet ID State Bound To Field Name Field Type Notes
0x0E Play Server Entity ID VarInt The ID of the entity to interact
Type VarInt Enum 0: interact, 1: attack, 2: interact at
Target X Optional Float Only if Type is interact at
Target Y Optional Float Only if Type is interact at
Target Z Optional Float Only if Type is interact at
Hand Optional VarInt Enum Only if Type is interact or interact at; 0: main hand, 1: off hand
Sneaking Boolean If the client is sneaking.

Generate Structure

Sent when Generate is pressed on the Jigsaw Block interface.

Packet ID State Bound To Field Name Field Type Notes
0x0F Play Server Location Position Block entity location
Levels VarInt Value of the levels slider/max depth to generate
Keep Jigsaws Boolean

Keep Alive (serverbound)

The server will frequently send out a keep-alive, each containing a random ID. The client must respond with the same packet.

Packet ID State Bound To Field Name Field Type Notes
0x10 Play Server Keep Alive ID Long

Lock Difficulty

Must have at least op level 2 to use. Appears to only be used on singleplayer; the difficulty buttons are still disabled in multiplayer.

Packet ID State Bound To Field Name Field Type Notes
0x11 Play Server Locked Boolean

Player Position

Updates the player's XYZ position on the server.

Checking for moving too fast is achieved like this:

  • Each server tick, the player's current position is stored
  • When a player moves, the changes in x, y, and z coordinates are compared with the positions from the previous tick (Δx, Δy, Δz)
  • Total movement distance squared is computed as Δx² + Δy² + Δz²
  • The expected movement distance squared is computed as velocityX² + veloctyY² + velocityZ²
  • If the total movement distance squared value minus the expected movement distance squared value is more than 100 (300 if the player is using an elytra), they are moving too fast.

If the player is moving too fast, it will be logged that "<player> moved too quickly! " followed by the change in x, y, and z, and the player will be teleported back to their current (before this packet) serverside position.

Also, if the absolute value of X or the absolute value of Z is a value greater than 3.2×107, or X, Y, or Z are not finite (either positive infinity, negative infinity, or NaN), the client will be kicked for “Invalid move player packet received”.

Packet ID State Bound To Field Name Field Type Notes
0x12 Play Server X Double Absolute position
Feet Y Double Absolute feet position, normally Head Y - 1.62
Z Double Absolute position
On Ground Boolean True if the client is on the ground, false otherwise

Player Position And Rotation (serverbound)

A combination of Player Rotation and Player Position.

Packet ID State Bound To Field Name Field Type Notes
0x13 Play Server X Double Absolute position
Feet Y Double Absolute feet position, normally Head Y - 1.62
Z Double Absolute position
Yaw Float Absolute rotation on the X Axis, in degrees
Pitch Float Absolute rotation on the Y Axis, in degrees
On Ground Boolean True if the client is on the ground, false otherwise

Player Rotation

The unit circle for yaw
The unit circle of yaw, redrawn

Updates the direction the player is looking in.

Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0,-1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.

Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.

The yaw and pitch of player (in degrees), standing at point (x0, y0, z0) and looking towards point (x, y, z) can be calculated with:

dx = x-x0
dy = y-y0
dz = z-z0
r = sqrt( dx*dx + dy*dy + dz*dz )
yaw = -atan2(dx,dz)/PI*180
if yaw < 0 then
    yaw = 360 + yaw
pitch = -arcsin(dy/r)/PI*180

You can get a unit vector from a given yaw/pitch via:

x = -cos(pitch) * sin(yaw)
y = -sin(pitch)
z =  cos(pitch) * cos(yaw)
Packet ID State Bound To Field Name Field Type Notes
0x14 Play Server Yaw Float Absolute rotation on the X Axis, in degrees
Pitch Float Absolute rotation on the Y Axis, in degrees
On Ground Boolean True if the client is on the ground, False otherwise

Player Movement

This packet as well as Player Position, Player Look, and Player Position And Look are called the “serverbound movement packets”. Vanilla clients will send Player Position once every 20 ticks even for a stationary player.

This packet is used to indicate whether the player is on ground (walking/swimming), or airborne (jumping/falling).

When dropping from sufficient height, fall damage is applied when this state goes from false to true. The amount of damage applied is based on the point where it last changed from true to false. Note that there are several movement related packets containing this state.

Packet ID State Bound To Field Name Field Type Notes
0x15 Play Server On Ground Boolean True if the client is on the ground, false otherwise

Vehicle Move (serverbound)

Sent when a player moves in a vehicle. Fields are the same as in Player Position And Look. Note that all fields use absolute positioning and do not allow for relative positioning.

Packet ID State Bound To Field Name Field Type Notes
0x16 Play Server X Double Absolute position (X coordinate)
Y Double Absolute position (Y coordinate)
Z Double Absolute position (Z coordinate)
Yaw Float Absolute rotation on the vertical axis, in degrees
Pitch Float Absolute rotation on the horizontal axis, in degrees

Steer Boat

Used to visually update whether boat paddles are turning. The server will update the Boat entity metadata to match the values here.

Packet ID State Bound To Field Name Field Type Notes
0x17 Play Server Left paddle turning Boolean
Right paddle turning Boolean

Right paddle turning is set to true when the left button or forward button is held; left paddle turning is set to true when the right button or forward button is set to true.

Pick Item

Used to swap out an empty space on the hotbar with the item in the given inventory slot. The Notchain client uses this for pick block functionality (middle click) to retrieve items from the inventory.


Packet ID State Bound To Field Name Field Type Notes
0x18 Play Server Slot to use VarInt See Inventory

The server will first search the player's hotbar for an empty slot, starting from the current slot and looping around to the slot before it. If there are no empty slots, it will start a second search from the current slot and find the first slot that does not contain an enchanted item. If there still are no slots that meet that criteria, then the server will use the currently selected slot.

After finding the appropriate slot, the server swaps the items and then send 3 packets:

  • Set Slot, with window ID set to -2 and slot set to the newly chosen slot and the item set to the item that is now in that slot (which was previously at the slot the client requested)
  • Set Slot, with window ID set to -2 and slot set to the slot the player requested, with the item that is now in that slot and was previously on the hotbar slot
  • Held Item Change, with the slot set to the newly chosen slot.

Craft Recipe Request

This packet is sent when a player clicks a recipe in the crafting book that is craftable (white border).

Packet ID State Bound To Field Name Field Type Notes
0x19 Play Server Window ID Byte
Recipe Identifier A recipe ID
Make all Boolean Affects the amount of items processed; true if shift is down when clicked

Player Abilities (serverbound)

The vanilla client sends this packet when the player starts/stops flying with the Flags parameter changed accordingly.

Packet ID State Bound To Field Name Field Type Notes
0x1A Play Server Flags Byte Bit mask. 0x02: is flying

Player Digging

Sent when the player mines a block. A Notchian server only accepts digging packets with coordinates within a 6-unit radius between the center of the block and 1.5 units from the player's feet (not their eyes).

Packet ID State Bound To Field Name Field Type Notes
0x1B Play Server Status VarInt Enum The action the player is taking against the block (see below)
Location Position Block position
Face Byte Enum The face being hit (see below)

Status can be one of seven values:

Value Meaning Notes
0 Started digging
1 Cancelled digging Sent when the player lets go of the Mine Block key (default: left click)
2 Finished digging Sent when the client thinks it is finished
3 Drop item stack Triggered by using the Drop Item key (default: Q) with the modifier to drop the entire selected stack (default: depends on OS). Location is always set to 0/0/0, Face is always set to -Y.
4 Drop item Triggered by using the Drop Item key (default: Q). Location is always set to 0/0/0, Face is always set to -Y.
5 Shoot arrow / finish eating Indicates that the currently held item should have its state updated such as eating food, pulling back bows, using buckets, etc. Location is always set to 0/0/0, Face is always set to -Y.
6 Swap item in hand Used to swap or assign an item to the second hand. Location is always set to 0/0/0, Face is always set to -Y.

The Face field can be one of the following values, representing the face being hit:

Value Offset Face
0 -Y Bottom
1 +Y Top
2 -Z North
3 +Z South
4 -X West
5 +X East

Entity Action

Sent by the client to indicate that it has performed certain actions: sneaking (crouching), sprinting, exiting a bed, jumping with a horse, and opening a horse's inventory while riding it.

Packet ID State Bound To Field Name Field Type Notes
0x1C Play Server Entity ID VarInt Player ID
Action ID VarInt Enum The ID of the action, see below
Jump Boost VarInt Only used by the “start jump with horse” action, in which case it ranges from 0 to 100. In all other cases it is 0.

Action ID can be one of the following values:

ID Action
0 Start sneaking
1 Stop sneaking
2 Leave bed
3 Start sprinting
4 Stop sprinting
5 Start jump with horse
6 Stop jump with horse
7 Open horse inventory
8 Start flying with elytra

Leave bed is only sent when the “Leave Bed” button is clicked on the sleep GUI, not when waking up due today time.

Open horse inventory is only sent when pressing the inventory key (default: E) while on a horse — all other methods of opening a horse's inventory (involving right-clicking or shift-right-clicking it) do not use this packet.

Steer Vehicle

Packet ID State Bound To Field Name Field Type Notes
0x1D Play Server Sideways Float Positive to the left of the player
Forward Float Positive forward
Flags Unsigned Byte Bit mask. 0x1: jump, 0x2: unmount

Also known as 'Input' packet.

Set Displayed Recipe

Replaces Recipe Book Data, type 0.

Packet ID State Bound To Field Name Field Type Notes
0x1E Play Server Recipe ID Identifier

Set Recipe Book State

Replaces Recipe Book Data, type 1.

Packet ID State Bound To Field Name Field Type Notes
0x1F Play Server Book ID VarInt enum 0: crafting, 1: furnace, 2: blast furnace, 3: smoker
Book Open Boolean
Filter Active Boolean

Name Item

Sent as a player is renaming an item in an anvil (each keypress in the anvil UI sends a new Name Item packet). If the new name is empty, then the item loses its custom name (this is different from setting the custom name to the normal name of the item). The item name may be no longer than 35 characters long, and if it is longer than that, then the rename is silently ignored.

Packet ID State Bound To Field Name Field Type Notes
0x20 Play Server Item name String (32767) The new name of the item

Resource Pack Status

Packet ID State Bound To Field Name Field Type Notes
0x21 Play Server Result VarInt Enum 0: successfully loaded, 1: declined, 2: failed download, 3: accepted

Advancement Tab

Packet ID State Bound To Field Name Field Type Notes
0x22 Play Server Action VarInt enum 0: Opened tab, 1: Closed screen
Tab ID Optional identifier Only present if action is Opened tab

Select Trade

When a player selects a specific trade offered by a villager NPC.

Packet ID State Bound To Field Name Field Type Notes
0x23 Play Server Selected slot VarInt The selected slot int the players current (trading) inventory. (Was a full Integer for the plugin message)

Set Beacon Effect

Changes the effect of the current beacon.

Packet ID State Bound To Field Name Field Type Notes
0x24 Play Server Primary Effect VarInt A Potion ID. (Was a full Integer for the plugin message)
Secondary Effect VarInt A Potion ID. (Was a full Integer for the plugin message)

Held Item Change (serverbound)

Sent when the player changes the slot selection

Packet ID State Bound To Field Name Field Type Notes
0x25 Play Server Slot Short The slot which the player has selected (0–8)

Update Command Block

Packet ID State Bound To Field Name Field Type Notes
0x26 Play Server
Location Position
Command String (32767)
Mode VarInt enum One of SEQUENCE (0), AUTO (1), or REDSTONE (2)
Flags Byte 0x01: Track Output (if false, the output of the previous command will not be stored within the command block); 0x02: Is conditional; 0x04: Automatic

Update Command Block Minecart

Packet ID State Bound To Field Name Field Type Notes
0x27 Play Server Entity ID VarInt
Command String
Track Output Boolean If false, the output of the previous command will not be stored within the command block.

Creative Inventory Action

While the user is in the standard inventory (i.e., not a crafting bench) in Creative mode, the player will send this packet.

Clicking in the creative inventory menu is quite different from non-creative inventory management. Picking up an item with the mouse actually deletes the item from the server, and placing an item into a slot or dropping it out of the inventory actually tells the server to create the item from scratch. (This can be verified by clicking an item that you don't mind deleting, then severing the connection to the server; the item will be nowhere to be found when you log back in.) As a result of this implementation strategy, the "Destroy Item" slot is just a client-side implementation detail that means "I don't intend to recreate this item.". Additionally, the long listings of items (by category, etc.) are a client-side interface for choosing which item to create. Picking up an item from such listings sends no packets to the server; only when you put it somewhere does it tell the server to create the item in that location.

This action can be described as "set inventory slot". Picking up an item sets the slot to item ID -1. Placing an item into an inventory slot sets the slot to the specified item. Dropping an item (by clicking outside the window) effectively sets slot -1 to the specified item, which causes the server to spawn the item entity, etc.. All other inventory slots are numbered the same as the non-creative inventory (including slots for the 2x2 crafting menu, even though they aren't visible in the vanilla client).

Packet ID State Bound To Field Name Field Type Notes
0x29 Play Server Slot Short Inventory slot
Clicked Item Slot

Update Jigsaw Block

Sent when Done is pressed on the Jigsaw Block interface.

Packet ID State Bound To Field Name Field Type Notes
0x28 Play Server Location Position Block entity location
Name Identifier
Target Identifier
Pool Identifier
Final state String "Turns into" on the GUI, final_state in NBT
Joint type String rollable if the attached piece can be rotated, else aligned

Update Structure Block

Packet ID State Bound To Field Name Field Type Notes
0x2A Play Server
Location Position Block entity location
Action VarInt enum An additional action to perform beyond simply saving the given data; see below
Mode VarInt enum One of SAVE (0), LOAD (1), CORNER (2), DATA (3).
Name String
Offset X Byte Between -32 and 32
Offset Y Byte Between -32 and 32
Offset Z Byte Between -32 and 32
Size X Byte Between 0 and 32
Size Y Byte Between 0 and 32
Size Z Byte Between 0 and 32
Mirror VarInt enum One of NONE (0), LEFT_RIGHT (1), FRONT_BACK (2).
Rotation VarInt enum One of NONE (0), CLOCKWISE_90 (1), CLOCKWISE_180 (2), COUNTERCLOCKWISE_90 (3).
Metadata String
Integrity Float Between 0 and 1
Seed VarLong
Flags Byte 0x01: Ignore entities; 0x02: Show air; 0x04: Show bounding box

Possible actions:

  • 0 - Update data
  • 1 - Save the structure
  • 2 - Load the structure
  • 3 - Detect size

The Notchian client uses update data to indicate no special action should be taken (i.e. the done button).

Update Sign

This message is sent from the client to the server when the “Done” button is pushed after placing a sign.

The server only accepts this packet after Open Sign Editor, otherwise this packet is silently ignored.

Packet ID State Bound To Field Name Field Type Notes
0x2B Play Server Location Position Block Coordinates
Line 1 String (384) First line of text in the sign
Line 2 String (384) Second line of text in the sign
Line 3 String (384) Third line of text in the sign
Line 4 String (384) Fourth line of text in the sign

Animation (serverbound)

Sent when the player's arm swings.

Packet ID State Bound To Field Name Field Type Notes
0x2C Play Server Hand VarInt Enum Hand used for the animation. 0: main hand, 1: off hand.

Spectate

Teleports the player to the given entity. The player must be in spectator mode.

The Notchian client only uses this to teleport to players, but it appears to accept any type of entity. The entity does not need to be in the same dimension as the player; if necessary, the player will be respawned in the right world. If the given entity cannot be found (or isn't loaded), this packet will be ignored. It will also be ignored if the player attempts to teleport to themselves.

Packet ID State Bound To Field Name Field Type Notes
0x2D Play Server Target Player UUID UUID of the player to teleport to (can also be an entity UUID)

Player Block Placement

Packet ID State Bound To Field Name Field Type Notes
0x2E Play Server Hand VarInt Enum The hand from which the block is placed; 0: main hand, 1: off hand
Location Position Block position
Face VarInt Enum The face on which the block is placed (as documented at Player Digging)
Cursor Position X Float The position of the crosshair on the block, from 0 to 1 increasing from west to east
Cursor Position Y Float The position of the crosshair on the block, from 0 to 1 increasing from bottom to top
Cursor Position Z Float The position of the crosshair on the block, from 0 to 1 increasing from north to south
Inside block Boolean True when the player's head is inside of a block.

Upon placing a block, this packet is sent once.

The Cursor Position X/Y/Z fields (also known as in-block coordinates) are calculated using raytracing. The unit corresponds to sixteen pixels in the default resource pack. For example, let's say a slab is being placed against the south face of a full block. The Cursor Position X will be higher if the player was pointing near the right (east) edge of the face, lower if pointing near the left. The Cursor Position Y will be used to determine whether it will appear as a bottom slab (values 0.0–0.5) or as a top slab (values 0.5-1.0). The Cursor Position Z should be 1.0 since the player was looking at the southernmost part of the block.

Inside block is true when a player's head (specifically eyes) are inside of a block's collision. In 1.13 and later versions, collision is rather complicated and individual blocks can have multiple collision boxes. For instance, a ring of vines has a non-colliding hole in the middle. This value is only true when the player is directly in the box. In practice, though, this value is only used by scaffolding to place in front of the player when sneaking inside of it (other blocks will place behind when you intersect with them -- try with glass for instance).

Use Item

Sent when pressing the Use Item key (default: right click) with an item in hand.

Packet ID State Bound To Field Name Field Type Notes
0x2F Play Server Hand VarInt Enum Hand used for the animation. 0: main hand, 1: off hand.