Difference between revisions of "Pre-release protocol"

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This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.13.2, protocol 404]]) to the current pre-release (currently [[Protocol version numbers|19w03b, protocol 455]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
+
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.15.2, protocol 578]]) to the current pre-release (currently [[Protocol version numbers|1.16.2-pre3, protocol 748]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
  
 
One who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occurred to the respective packets there.
 
One who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occurred to the respective packets there.
Line 9: Line 9:
 
=== Data types ===
 
=== Data types ===
  
==== Position ====
+
The UUID type is now also sometimes encoded by the Notchian server as an array of four 32-bit integers, from most significant to least significant (matching the new format used on entity NBT). This representation is identical to using 16 bytes, two 64-bit integers, or one 128-bit integers.
 
 
64-bit value split in to three parts
 
 
 
* x: 26 MSBs
 
* z: 26 {{change|LSBs|middle bits}}
 
* y: 12 {{change|bits between them|LSBs}}
 
 
 
Encoded as followed:
 
 
 
((x & 0x3FFFFFF) << 38) | {{change|((y & 0xFFF) << 26) {{!}} (z & 0x3FFFFFF)|((z & 0x3FFFFFF) << 12) {{!}} (y & 0xFFF)}}
 
 
 
And decoded as:
 
 
 
  val = read_unsigned_long();
 
x = val >> 38;
 
y = {{change|(val >> 26) & 0xFFF|val & 0xFFF}};
 
z = {{change|val << 38 >> 38|(val << 38 >> 38) >> 12}};
 
 
 
Note: The details of bit shifting are rather language dependent; the above may work in Java but probably won't in other languages without some tweaking. In particular, you will usually receive positive numbers even if the actual coordinates are negative. This can be fixed by adding something like the following:
 
 
 
if x >= 2^25 { x -= 2^26 }
 
if y >= 2^11 { y -= 2^12 }
 
if z >= 2^25 { z -= 2^26 }
 
  
 
=== Packets ===
 
=== Packets ===
Line 45: Line 22:
 
  |-
 
  |-
 
!colspan="4"| Play clientbound
 
!colspan="4"| Play clientbound
{{PacketList|0x09|Update Block Entity}}
+
{{PacketList|0x02|Spawn Weather Entity|pre=removed}}
{{PacketList|0x14|Open Horse Window|rel=added}}
+
{{PacketList|{{change|0x03|0x02}}|Spawn Living Entity|pre=unchanged}}
{{PacketList|0x22|Chunk Data}}
+
{{PacketList|{{change|0x04|0x03}}|Spawn Painting|pre=unchanged}}
{{PacketList|0x26|Map Data}}
+
{{PacketList|{{change|0x05|0x04}}|Spawn Player|pre=unchanged}}
{{PacketList|0x2C|Open Book|rel=added}}
+
{{PacketList|{{change|0x06|0x05}}|Entity Animation (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x2C|0x2D}}|Open Sign Editor|pre=unchanged}}
+
{{PacketList|{{change|0x07|0x06}}|Statistics|pre=unchanged}}
{{PacketList|{{change|0x2D|0x2E}}|Craft Recipe Response|pre=unchanged}}
+
{{PacketList|{{change|0x08|0x07}}|Acknowledge Player Digging|pre=unchanged}}
{{PacketList|{{change|0x2E|0x2F}}|Player Abilities (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x09|0x08}}|Block Break Animation|pre=unchanged}}
{{PacketList|{{change|0x2F|0x30}}|Combat Event|pre=unchanged}}
+
{{PacketList|{{change|0x0A|0x09}}|Block Entity Data|pre=unchanged}}
{{PacketList|{{change|0x30|0x31}}|Player List Item|pre=unchanged}}
+
{{PacketList|{{change|0x0B|0x0A}}|Block Action|pre=unchanged}}
{{PacketList|{{change|0x31|0x32}}|Face Player|pre=unchanged}}
+
{{PacketList|{{change|0x0C|0x0B}}|Block Change|pre=unchanged}}
{{PacketList|{{change|0x32|0x33}}|Player Position And Look (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x0D|0x0C}}|Boss Bar|pre=unchanged}}
{{PacketList|{{change|0x33|0x34}}|Use Bed|pre=unchanged}}
+
{{PacketList|{{change|0x0E|0x0D}}|Server Difficulty|pre=unchanged}}
{{PacketList|{{change|0x34|0x35}}|Unlock Recipes|pre=unchanged}}
+
{{PacketList|{{change|0x0F|0x0E}}|Chat Message (clientbound)}}
{{PacketList|{{change|0x35|0x36}}|Destroy Entities|pre=unchanged}}
+
{{PacketList|{{change|0x11|0x0F}}|Tab-Complete (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x36|0x37}}|Remove Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x12|0x10}}|Declare Commands|pre=unchanged}}
{{PacketList|{{change|0x37|0x38}}|Resource Pack Send|pre=unchanged}}
+
{{PacketList|{{change|0x13|0x11}}|Window Confirmation (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x38|0x39}}|Respawn|pre=unchanged}}
+
{{PacketList|{{change|0x14|0x12}}|Close Window (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x39|0x3A}}|Entity Head Look|pre=unchanged}}
+
{{PacketList|{{change|0x15|0x13}}|Window Items|pre=unchanged}}
{{PacketList|{{change|0x3A|0x3B}}|Select Advancement Tab|pre=unchanged}}
+
{{PacketList|{{change|0x16|0x14}}|Window Property|pre=unchanged}}
{{PacketList|{{change|0x3B|0x3C}}|World Border|pre=unchanged}}
+
{{PacketList|{{change|0x17|0x15}}|Set Slot|pre=unchanged}}
{{PacketList|{{change|0x3C|0x3D}}|Camera|pre=unchanged}}
+
{{PacketList|{{change|0x18|0x16}}|Set Cooldown|pre=unchanged}}
{{PacketList|{{change|0x3D|0x3E}}|Held Item Change (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x19|0x17}}|Plugin Message (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x3E|0x3F}}|Display Scoreboard|pre=unchanged}}
+
{{PacketList|{{change|0x1A|0x18}}|Named Sound Effect|pre=unchanged}}
{{PacketList|{{change|0x3F|0x40}}|Entity Metadata|pre=unchanged}}
+
{{PacketList|{{change|0x1B|0x19}}|Disconnect (play)|pre=unchanged}}
{{PacketList|{{change|0x40|0x41}}|Attach Entity|pre=unchanged}}
+
{{PacketList|{{change|0x1C|0x1A}}|Entity Status|pre=unchanged}}
{{PacketList|{{change|0x41|0x42}}|Entity Velocity|pre=unchanged}}
+
{{PacketList|{{change|0x1D|0x1B}}|Explosion|pre=unchanged}}
{{PacketList|{{change|0x42|0x43}}|Entity Equipment|pre=unchanged}}
+
{{PacketList|{{change|0x1E|0x1C}}|Unload Chunk|pre=unchanged}}
{{PacketList|{{change|0x43|0x44}}|Set Experience|pre=unchanged}}
+
{{PacketList|{{change|0x1F|0x1D}}|Change Game State|pre=unchanged}}
{{PacketList|{{change|0x44|0x45}}|Update Health|pre=unchanged}}
+
{{PacketList|{{change|0x20|0x1E}}|Open Horse Window|pre=unchanged}}
{{PacketList|{{change|0x45|0x46}}|Scoreboard Objective|pre=unchanged}}
+
{{PacketList|{{change|0x21|0x1F}}|Keep Alive (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x46|0x47}}|Set Passengers|pre=unchanged}}
+
{{PacketList|{{change|0x22|0x20}}|Chunk Data}}
{{PacketList|{{change|0x47|0x48}}|Teams|pre=unchanged}}
+
{{PacketList|{{change|0x23|0x21}}|Effect|pre=unchanged}}
{{PacketList|{{change|0x48|0x49}}|Update Score|pre=unchanged}}
+
{{PacketList|{{change|0x24|0x22}}|Particle|pre=unchanged}}
{{PacketList|{{change|0x49|0x4A}}|Spawn Position|pre=unchanged}}
+
{{PacketList|{{change|0x25|0x23}}|Update Light}}
{{PacketList|{{change|0x4A|0x4B}}|Time Update|pre=unchanged}}
+
{{PacketList|{{change|0x26|0x24}}|Join Game}}
{{PacketList|{{change|0x4B|0x4C}}|Title|pre=unchanged}}
+
{{PacketList|{{change|0x27|0x25}}|Map Data|pre=unchanged}}
{{PacketList|{{change|0x4C|0x4D}}|Stop Sound|pre=unchanged}}
+
{{PacketList|{{change|0x28|0x26}}|Trade List|pre=unchanged}}
{{PacketList|{{change|0x4D|0x4E}}|Sound Effect|pre=unchanged}}
+
{{PacketList|{{change|0x29|0x27}}|Entity Position|pre=unchanged}}
{{PacketList|0x4F|Entity Sound Effect|rel=added}}
+
{{PacketList|{{change|0x2A|0x28}}|Entity Position and Rotation|pre=unchanged}}
{{PacketList|{{change|0x4E|0x50}}|Player List Header And Footer|pre=unchanged}}
+
{{PacketList|{{change|0x2B|0x29}}|Entity Rotation|pre=unchanged}}
{{PacketList|{{change|0x4F|0x51}}|Collect Item|pre=unchanged}}
+
{{PacketList|{{change|0x2C|0x2A}}|Entity Movement|pre=unchanged}}
{{PacketList|{{change|0x50|0x52}}|Entity Teleport|pre=unchanged}}
+
{{PacketList|{{change|0x2D|0x2B}}|Vehicle Move (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x51|0x53}}|Advancements|pre=unchanged}}
+
{{PacketList|{{change|0x2E|0x2C}}|Open Book|pre=unchanged}}
{{PacketList|{{change|0x52|0x54}}|Entity Properties|pre=unchanged}}
+
{{PacketList|{{change|0x2F|0x2D}}|Open Window|pre=unchanged}}
{{PacketList|{{change|0x53|0x55}}|Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x30|0x2E}}|Open Sign Editor|pre=unchanged}}
{{PacketList|{{change|0x54|0x56}}|Declare Recipes|pre=unchanged}}
+
{{PacketList|{{change|0x31|0x2F}}|Craft Recipe Response|pre=unchanged}}
{{PacketList|{{change|0x55|0x57}}|Tags}}
+
{{PacketList|{{change|0x32|0x30}}|Player Abilities (clientbound)|pre=unchanged}}
{{PacketList|0x58|Update Light|rel=added}}
+
{{PacketList|{{change|0x33|0x31}}|Combat Event|pre=unchanged}}
{{PacketList|{{change|0x14|0x59}}|Open Window}}
+
{{PacketList|{{change|0x34|0x32}}|Player Info|pre=unchanged}}
{{PacketList|0x5A|Trade List|rel=added}}
+
{{PacketList|{{change|0x35|0x33}}|Face Player|pre=unchanged}}
 +
{{PacketList|{{change|0x36|0x34}}|Player Position And Look (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x37|0x35}}|Unlock Recipes}}
 +
{{PacketList|{{change|0x38|0x36}}|Destroy Entities|pre=unchanged}}
 +
{{PacketList|{{change|0x39|0x37}}|Remove Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x3A|0x38}}|Resource Pack Send|pre=unchanged}}
 +
{{PacketList|{{change|0x3B|0x39}}|Respawn}}
 +
{{PacketList|{{change|0x3C|0x3A}}|Entity Head Look|pre=unchanged}}
 +
{{PacketList|{{change|0x10|0x3B}}|Multi Block Change}}
 +
{{PacketList|{{change|0x3D|0x3C}}|Select Advancement Tab|pre=unchanged}}
 +
{{PacketList|{{change|0x3E|0x3D}}|World Border|pre=unchanged}}
 +
{{PacketList|{{change|0x3F|0x3E}}|Camera|pre=unchanged}}
 +
{{PacketList|{{change|0x40|0x3F}}|Held Item Change (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x41|0x40}}|Update View Position|pre=unchanged}}
 +
{{PacketList|{{change|0x42|0x41}}|Update View Distance|pre=unchanged}}
 +
{{PacketList|0x47|Entity Equipment}}
 +
{{PacketList|{{change|0x4E|0x42}}|Spawn Position|pre=unchanged}}
 +
{{PacketList|{{change|0x4F|0x4E}}|Time Update|pre=unchanged}}
 +
{{PacketList|{{change|0x50|0x4F}}|Title|pre=unchanged}}
 +
{{PacketList|{{change|0x51|0x50}}|Entity Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x52|0x51}}|Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x53|0x52}}|Stop Sound|pre=unchanged}}
 +
{{PacketList|{{change|0x54|0x53}}|Player List Header And Footer|pre=unchanged}}
 +
{{PacketList|{{change|0x55|0x54}}|NBT Query Response|pre=unchanged}}
 +
{{PacketList|{{change|0x56|0x55}}|Collect Item|pre=unchanged}}
 +
{{PacketList|{{change|0x57|0x56}}|Entity Teleport|pre=unchanged}}
 +
{{PacketList|{{change|0x58|0x57}}|Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x59|0x58}}|Entity Properties}}
 +
{{PacketList|{{change|0x5A|0x59}}|Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x5B|0x5A}}|Declare Recipes}}
 +
{{PacketList|{{change|0x5C|0x5B}}|Tags|pre=unchanged}}
 
  |-
 
  |-
 
!colspan="4"| Play serverbound
 
!colspan="4"| Play serverbound
{{PacketList|0x1B|Recipe Book Data}}
+
{{PacketList|0x0E|Interact Entity}}
{{PacketList|0x29|Player Block Placement}}
+
{{PacketList|0x0F|Generate Structure|rel=added}}
 +
{{PacketList|{{change|0x0F|0x10}}|Keep Alive (serverbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x10|0x11}}|Lock Difficulty|pre=unchanged}}
 +
{{PacketList|{{change|0x11|0x12}}|Player Position|pre=unchanged}}
 +
{{PacketList|{{change|0x12|0x13}}|Player Position And Rotation (serverbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x13|0x14}}|Player Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x14|0x15}}|Player Movement|pre=unchanged}}
 +
{{PacketList|{{change|0x15|0x16}}|Vehicle Move (serverbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x16|0x17}}|Steer Boat|pre=unchanged}}
 +
{{PacketList|{{change|0x17|0x18}}|Pick Item|pre=unchanged}}
 +
{{PacketList|{{change|0x18|0x19}}|Craft Recipe Request|pre=unchanged}}
 +
{{PacketList|{{change|0x19|0x1A}}|Player Abilities (serverbound)}}
 +
{{PacketList|{{change|0x1A|0x1B}}|Player Digging|pre=unchanged}}
 +
{{PacketList|{{change|0x1B|0x1C}}|Entity Action|pre=unchanged}}
 +
{{PacketList|{{change|0x1C|0x1D}}|Steer Vehicle|pre=unchanged}}
 +
{{PacketList|0x1D|Recipe Book Data|pre=removed}}
 +
{{PacketList|0x1E|Set Displayed Recipe|rel=added}}
 +
{{PacketList|0x1F|Set Recipe Book State|rel=added}}
 +
{{PacketList|{{change|0x1E|0x20}}|Name Item|pre=unchanged}}
 +
{{PacketList|{{change|0x1F|0x21}}|Resource Pack Status|pre=unchanged}}
 +
{{PacketList|{{change|0x20|0x22}}|Advancement Tab|pre=unchanged}}
 +
{{PacketList|{{change|0x21|0x23}}|Select Trade|pre=unchanged}}
 +
{{PacketList|{{change|0x22|0x24}}|Set Beacon Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x23|0x25}}|Held Item Change (serverbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x24|0x26}}|Update Command Block|pre=unchanged}}
 +
{{PacketList|{{change|0x25|0x27}}|Update Command Block Minecart|pre=unchanged}}
 +
{{PacketList|{{change|0x26|0x28}}|Creative Inventory Action|pre=unchanged}}
 +
{{PacketList|{{change|0x27|0x29}}|Update Jigsaw Block}}
 +
{{PacketList|{{change|0x28|0x2A}}|Update Structure Block|pre=unchanged}}
 +
{{PacketList|{{change|0x29|0x2B}}|Update Sign|pre=unchanged}}
 +
{{PacketList|{{change|0x2A|0x2C}}|Animation (serverbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x2B|0x2D}}|Spectate|pre=unchanged}}
 +
{{PacketList|{{change|0x2C|0x2E}}|Player Block Placement|pre=unchanged}}
 +
{{PacketList|{{change|0x2D|0x2F}}|Use Item|pre=unchanged}}
 +
|-
 +
!colspan="4"| Login clientbound
 +
{{PacketList|0x02|Login Success}}
 
  |}
 
  |}
  
Line 108: Line 151:
 
== Entity Metadata ==
 
== Entity Metadata ==
  
=== Entity Metadata Format ===
+
{{#vardefine:meta_prerelease|1}}
 
 
Note that entity metadata is a totally distinct concept from block metadata.  It is not required to send all metadata fields, or even any metadata fields, so long as the terminating entry is correctly sent.
 
  
Entity Metadata is an array of entries, each of which looks like the following:
+
=== FishingHook ===
  
{| class="wikitable"
+
{{Metadata inherit|FishingHook|inherits=Entity|start_at=7}}
! Name
 
! Type
 
! Meaning
 
|-
 
| Index
 
| Unsigned Byte
 
| Unique index key determining the meaning of the following value, see the table below. If this is <code>0xff</code> then the it is the end of the Entity Metadata array and no more is read.
 
|-
 
| Type
 
| Optional VarInt Enum
 
| Only if Index is not <code>0xff</code>; the type of the index, see the table below
 
|-
 
| Value
 
| Optional ''value of Type''
 
| Only if Index is not <code>0xff</code>: the value of the metadata field
 
|}
 
  
 
{| class="wikitable"
 
{| class="wikitable"
! Value of Type field
 
! [[Data types|Type]] of Value field
 
! Notes
 
|-
 
| 0
 
| Byte
 
|
 
|-
 
| 1
 
| VarInt
 
|
 
|-
 
| 2
 
| Float
 
|
 
|-
 
| 3
 
| String
 
|
 
|-
 
| 4
 
| [[Chat]]
 
|
 
|-
 
| 5
 
| OptChat (Boolean + Optional [[Chat]])
 
| [[Chat]] is present if the Boolean is set to true
 
|-
 
| 6
 
| [[Slot]]
 
|
 
|-
 
| 7
 
| Boolean
 
|
 
|-
 
| 8
 
| Rotation
 
| 3 floats: rotation on x, rotation on y, rotation on z
 
|-
 
| 9
 
| [[Data Types#Position|Position]]
 
|
 
|-
 
| 10
 
| OptPosition (Boolean + Optional Position)
 
| Position is present if the Boolean is set to true
 
|-
 
| 11
 
| Direction (VarInt)
 
| (Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5)
 
|-
 
| 12
 
| OptUUID (Boolean + Optional UUID)
 
| UUID is present if the Boolean is set to true
 
|-
 
| 13
 
| OptBlockID (VarInt)
 
| 0 for absent otherwise, <code><nowiki>id &lt;&lt; 4 | data</nowiki></code>
 
|-
 
| 14
 
| [[NBT]]
 
|
 
|-
 
| 15
 
| [[Data Types#Particle|Particle]]
 
|
 
|- {{Added}}
 
| 16
 
| Villager Data
 
| 3 VarInts: villager type, villager profession, level
 
|}
 
 
Villager type (<code>minecraft:villager_type</code> registry):
 
 
{| class="wikitable"
 
! Name !! ID
 
|-
 
| <code>minecraft:desert</code> || 0
 
|-
 
| <code>minecraft:jungle</code> || 1
 
|-
 
| <code>minecraft:plains</code> || 2
 
|-
 
| <code>minecraft:savanna</code> || 3
 
|-
 
| <code>minecraft:snow</code> || 4
 
|-
 
| <code>minecraft:swamp</code> || 5
 
|-
 
| <code>minecraft:taiga</code> || 6
 
|}
 
 
Villager professions (<code>minecraft:villager_profession</code> registry):
 
 
{| class="wikitable"
 
! Name !! ID
 
|-
 
| <code>minecraft:none</code> || 0
 
|-
 
| <code>minecraft:armorer</code> || 1
 
|-
 
| <code>minecraft:butcher</code> || 2
 
|-
 
| <code>minecraft:cartographer</code> || 3
 
|-
 
| <code>minecraft:cleric</code> || 4
 
|-
 
| <code>minecraft:farmer</code> || 5
 
|-
 
| <code>minecraft:fisherman</code> || 6
 
|-
 
| <code>minecraft:fletcher</code> || 7
 
|-
 
| <code>minecraft:leatherworker</code> || 8
 
|-
 
| <code>minecraft:librarian</code> || 9
 
|-
 
| <code>minecraft:mason</code> || 10
 
|-
 
| <code>minecraft:nitwit</code> || 11
 
|-
 
| <code>minecraft:shepherd</code> || 12
 
|-
 
| <code>minecraft:toolsmith</code> || 13
 
|-
 
| <code>minecraft:weaponsmith</code> || 14
 
|}
 
 
=== Mobs ===
 
 
Entity IDs have shifted with the addition of some new mobs.
 
 
=== Itemed Throwable ===
 
 
Extends [[#Throwable|Throwable]].
 
 
Used for all things that previously extended throwable other than potions, which already had an item.
 
 
{| class="wikitable" {{added}}
 
 
  ! Index
 
  ! Index
 
  ! Type
 
  ! Type
Line 278: Line 163:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | 6
+
  | {{Metadata id|}}
  | Slot
+
  | VarInt
  |colspan="2"| Item
+
  |colspan="2"| Hooked entity id + 1, or 0 if there is no hooked entity
  | empty (which behaves as if it were a specific item, depending on the subclass)
+
| 0
 +
|- {{Added}}
 +
  | {{Metadata id|added}}
 +
| Boolean
 +
|colspan="2"| Is catchable
 +
| False
 
  |}
 
  |}
  
=== Egg ===
+
=== Abstract Arrow ===
 
 
Extends [[#Throwable|Throwable]].
 
 
 
No additional metadata.
 
 
 
An empty item behaves as if the item were a <code>minecraft:egg</code>.
 
 
 
=== Ender Pearl ===
 
 
 
Extends [[#Throwable|Throwable]].
 
 
 
No additional metadata.
 
 
 
An empty item behaves as if the item were a <code>minecraft:ender_pearl</code>.
 
 
 
=== Experience Bottle ===
 
 
 
Extends [[#Throwable|Throwable]].
 
 
 
No additional metadata.
 
 
 
<code>minecraft:experience_bottle</code>
 
 
 
=== Snowball ===
 
  
Extends [[#Throwable|Throwable]].
+
{{Metadata inherit|Abstract Arrow|inherits=Entity|start_at=7}}
  
No additional metadata.
+
Abstract base class for [[#Tipped Arrow|Tipped Arrow]] (which is used for regular arrows as well as tipped ones) and [[#Spectral Arrow|Spectral Arrow]].
 
 
<code>minecraft:snowball</code>
 
 
 
=== Eye of Ender ===
 
 
 
Extends [[#Entity|Entity]].
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
|-
 
| 6
 
| Slot
 
|colspan="2"| Item
 
| empty (which behaves as if it were a <code>minecraft:ender_eye</code>)
 
|}
 
 
 
=== Arrow ===
 
 
 
Extends [[#Entity|Entity]].
 
 
 
Abstract base class for [[#TippedArrow|TippedArrow]] (which is used for regular arrows as well as tipped ones) and Spectral Arrow.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 344: Line 186:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | rowspan="3" | 6
+
  | rowspan="3" | {{Metadata id|}}
 
  | rowspan="3" | Byte
 
  | rowspan="3" | Byte
 
  ! Bit mask
 
  ! Bit mask
Line 355: Line 197:
 
  | 0x02
 
  | 0x02
 
  | Is noclip (used by loyalty tridents when returning)
 
  | Is noclip (used by loyalty tridents when returning)
  |-
+
  |- {{removed}}
  | 7
+
  | {{Metadata id|removed}}
 
  | OptUUID
 
  | OptUUID
  |colspan="2"| Shooter UUID
+
  |colspan="2"| Unused
 
  | Empty
 
  | Empty
  |- {{added}}
+
  |-
| 8
+
| {{Metadata id|}}
 
  | Byte
 
  | Byte
  |colspan="2"| Piercing level
+
  |colspan="2"| Peircing level
 
  | 0
 
  | 0
 
  |}
 
  |}
  
=== TippedArrow ===
+
=== Tipped Arrow ===
  
Extends [[#Arrow|Arrow]].
+
{{Metadata inherit|Tipped Arrow|inherits=Abstract Arrow}}
  
 
Used for both tipped and regular arrows.  If not tipped, then color is set to -1 and no tipped arrow particles are used.
 
Used for both tipped and regular arrows.  If not tipped, then color is set to -1 and no tipped arrow particles are used.
Line 379: Line 221:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | {{change|8|9}}
+
  | {{Metadata id|}}
 
  | VarInt
 
  | VarInt
 
  |colspan="2"| Color (-1 for no particles)
 
  |colspan="2"| Color (-1 for no particles)
 
  | -1
 
  | -1
 
  |}
 
  |}
 +
 +
=== Spectral Arrow ===
 +
 +
{{Metadata inherit|Spectral Arrow|inherits=Abstract Arrow}}
 +
 +
No additional metadata.
  
 
=== Trident ===
 
=== Trident ===
  
Extends [[#Arrow|Arrow]].
+
{{Metadata inherit|Trident|inherits=Abstract Arrow}}
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 395: Line 243:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | {{change|8|9}}
+
  | {{Metadata id|}}
 
  | VarInt
 
  | VarInt
 
  |colspan="2"| Loyalty level (enchantment)
 
  |colspan="2"| Loyalty level (enchantment)
 
  | 0
 
  | 0
 +
|-
 +
| {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Has enchantment glint
 +
| False
 
  |}
 
  |}
  
=== Itemed Fireball ===
+
=== Strider ===
 
 
Extends [[#Entity|Entity]].
 
  
Used for regular and small fireballs.  Not used for dragon fireballs and wither skulls.  Interestingly, regular fireballs do not come from an item.
+
{{Metadata inherit|Strider|inherits=Animal|start_at=16}}
  
 
{| class="wikitable" {{added}}
 
{| class="wikitable" {{added}}
Line 413: Line 264:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | 6
+
  | {{Metadata id|}}
| Slot
+
  | VarInt
|colspan="2"| Item
+
|colspan="2"| Total time to "boost" with warped fungus on a stick for
| empty (which behaves as if it were a <code>minecraft:fire_charge</code>)
+
  | 0
|}
 
 
 
=== Fireball ===
 
 
 
Extends {{change|[[#Abstract Fireball|Abstract Fireball]]|[[#Itemed Fireball|Itemed Fireball]]}}.  This is the large fireball shot by ghasts.
 
 
 
No additional metadata.
 
 
 
=== Small Fireball ===
 
 
 
Extends {{change|[[#Abstract Fireball|Abstract Fireball]]|[[#Itemed Fireball|Itemed Fireball]]}}. This is the fireball shot by blazes and dispensers with fire charges.
 
 
 
No additional metadata.
 
 
 
=== Fireworks ===
 
 
 
Extends [[#Entity|Entity]].
 
 
 
{| class="wikitable"
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
  ! Default
 
 
  |-
 
  |-
  | 6
+
  | {{Metadata id|}}
  | [[Slot]]
+
  | Boolean
  |colspan="2"| Firework info
+
  |colspan="2"| Is shaking (true unless riding a vehicle or on or in a block tagged with strider_warm_blocks (default: lava))
  | empty
+
  | false
 
  |-
 
  |-
| 7
+
  | {{Metadata id|}}
  | {{Change|VarInt|OptUUID}}
 
|colspan="2"| Entity {{change|ID|UUID}} of entity which used firework (for elytra boosting)
 
| 0
 
|- {{Added}}
 
| 8
 
 
  | Boolean
 
  | Boolean
  |colspan="2"| Shot at angle (from a crossbow)
+
  |colspan="2"| Has saddle
 
  | false
 
  | false
 
  |}
 
  |}
  
=== Illager Beast ===
+
=== Hoglin ===
  
Extends [[#Monster|Monster]]
+
{{Metadata inherit|Hoglin|inherits=Animal|start_at=16}}
 
 
No additional metadata.
 
 
 
{| class="wikitable" {{added}}
 
! Status
 
!colspan="2"| Description
 
|-
 
| 4
 
|colspan="2"| Starts the attack animation.
 
|-
 
| 39
 
|colspan="2"| Starts the stun animation.
 
|}
 
 
 
=== Panda ===
 
 
 
Extends [[#Animal|Animal]].
 
  
 
{| class="wikitable" {{added}}
 
{| class="wikitable" {{added}}
Line 484: Line 290:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | 13
+
  | {{Metadata id|}}
| Integer
+
  | Boolean
|colspan="2"| Breed timer?  Set to 32 when something happens, and then counts down to 0 again.  At 29 and 14 (before counting down), will play the <code>entity.panda.cant_breed</code> sound event.
+
  |colspan="2"| Is immune to zombification
| 0
+
  | false
|-
 
| 14
 
  | Integer
 
  |colspan="2"| Sneeze timer.  Counts up from 0; when it hits 1 the <code>entity.panda.pre_sneeze</code> event plays and when it hits 21 the <code>entity.panda.sneeze</code> event plays (and it is set back to 0 and the sneeze flag is cleared).
 
| 0
 
|-
 
| 15
 
| Integer
 
|colspan="2"| Eat timer.  If nonzero, counts upwards.
 
| 0
 
|-
 
| 16
 
| Byte
 
|colspan="2"| Main Gene
 
| 0
 
|-
 
| 17
 
| Byte
 
|colspan="2"| Hidden Gene
 
| 0
 
|-
 
|rowspan="6"| 18
 
|rowspan="6"| Byte
 
! Bit mask
 
! Meaning
 
|rowspan="6"| 0
 
|-
 
| 0x01
 
| Unused
 
|-
 
| 0x02
 
| Is sneezing
 
|-
 
| 0x04
 
| Is eating
 
|-
 
| 0x08
 
| Unknown
 
|-
 
| 0x10
 
  | Unknown
 
 
  |}
 
  |}
  
=== Pillager ===
+
=== Zoglin ===
  
Extends [[#Abstract Illager|Abstract Illlager]].
+
{{Metadata inherit|Hoglin|inherits=Monster|start_at=15}}
  
 
{| class="wikitable" {{added}}
 
{| class="wikitable" {{added}}
Line 541: Line 306:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | 13
+
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  | colspan="2"| Using crossbow
+
  |colspan="2"| Is baby
 
  | false
 
  | false
 
  |}
 
  |}
  
=== Ocelot ===
+
=== Base Piglin ===
  
Extends {{change|[[#TameableAnimal|TameableAnimal]]|[[#Ageable|Ageable]]}}.
+
{{Metadata inherit|Base Piglin|inherits=Monster|start_at=15}}
  
{| class="wikitable"
+
{| class="wikitable" {{added}}
 
  ! Index
 
  ! Index
 
  ! Type
 
  ! Type
 
  !style="width: 250px;" colspan="2"| Meaning
 
  !style="width: 250px;" colspan="2"| Meaning
 
  ! Default
 
  ! Default
  |- {{removed}}
+
  |-
| 15
+
  | {{Metadata id|}}
| VarInt
 
|colspan="2"| Type (0 = untamed, 1 = tuxedo, 2 = tabby, 3 = siamese).  Used to render regardless as to whether it is tamed or not.
 
  | 0
 
|- {{added}}
 
| 13
 
 
  | Boolean
 
  | Boolean
  |colspan="2"| Is trusting
+
  |colspan="2"| Is immune to zombification
 
  | false
 
  | false
 
  |}
 
  |}
  
{| class="wikitable" {{added}}
+
=== Piglin ===
! Status
 
!colspan="2"| Description
 
|-
 
| 40
 
|colspan="2"| Spawn smoke particles (trust gaining failed)
 
|-
 
| 41
 
|colspan="2"| Spawn heart particles (trust gaining succeeded)
 
|}
 
 
 
=== Cat ===
 
  
Extends [[#TameableAnimal|TameableAnimal]].
+
{{Metadata inherit|Piglin|inherits=Base Piglin}}
  
 
{| class="wikitable" {{added}}
 
{| class="wikitable" {{added}}
Line 589: Line 338:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | 15
+
  | {{Metadata id|}}
  | VarInt
+
  | Boolean
  |colspan="2"| Type (0 = tabby, 1 = black, 2 = red, 3 = siamese, 4 = british_shorthair, 5 = calico, 6 = persian, 7 = ragdoll, 8 = white, 9 = all_black)
+
  |colspan="2"| Is baby
  | 1
+
  | false
 
  |-
 
  |-
  | 16
+
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Unknown
+
  |colspan="2"| Is charging crossbow
 
  | false
 
  | false
 
  |-
 
  |-
  | 17
+
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Unknown
+
  |colspan="2"| Is dancing
 
  | false
 
  | false
|-
 
| 18
 
| VarInt
 
|colspan="2"| Collar color (values are those {{Minecraft Wiki|Data_values#Dyes|used with dyes}})
 
| 14 (Red)
 
 
  |}
 
  |}
  
=== Villager ===
+
=== Piglin Brute ===
  
Extends [[#Ageable|Ageable]].
+
{{Metadata inherit|Piglin Brute|inherits=Base Piglin}}
  
{| class="wikitable"
+
No additional metadata.
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
|-
 
| 13
 
| {{change|VarInt|Villager Data}}
 
|colspan="2"| {{Change|Profession (Farmer = 0, Librarian = 1, Priest = 2, Blacksmith = 3, Butcher = 4, Nitwit = 5)|Villager Data}}
 
| {{change|0|Plains/None/1}}
 
|}
 
  
=== Zombie Villager ===
+
=== Wolf ===
  
Extends [[#Zombie|Zombie]].
+
{{Metadata inherit|Wolf|inherits=TameableAnimal|start_at=18}}
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 636: Line 370:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | 16
+
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Is converting
+
  |colspan="2"| Is begging
 
  | false
 
  | false
  |-  
+
  |-
| 17
+
  | {{Metadata id|}}
  | {{Change|VarInt|Villager Data}}
+
| VarInt
  |colspan="2"| {{Change|Profession|Villager Data}}
+
  |colspan="2"| Collar color (values are those {{Minecraft Wiki|Data_values#Dyes|used with dyes}})
  | {{change|0|Plains/None/1}}
+
  | 14 (Red)
 +
|- {{Added}}
 +
| {{Metadata id|}}
 +
| VarInt
 +
|colspan="2"| Anger time
 +
| 0
 
  |}
 
  |}
  
== Block Actions ==
+
=== {{Change|Zombie Pigman|Zombified Piglin}} ===
  
No changes so far.
+
{{Metadata inherit|{{Change|Zombie Pigman|Zombified Piglin}}|inherits=Zombie|start_at=18}}
  
== Plugin Channels ==
+
No additional metadata.
  
=== <code>minecraft:book_open</code> ===
+
== Block Actions ==
{{change|''Server to client''}}
 
  
{{change|When a player right clicks with a signed book. This tells the client to open the book GUI.}}
+
No changes so far.
  
{{change|The payload is a VarInt enum for the selected hand: 0 for the main hand, 1 for the offhand.}}
+
== Inventories ==
  
{{change||Replaced with [[#Open Book|Open Book]] packet.}}
+
No changes so far.
  
=== <code>minecraft:trader_list</code> ===
+
== Plugin Channels ==
{{change|''Server to client''}}
 
  
{{change|The list of trades a villager NPC is offering.}}
+
No changes so far.
 
 
{{change||Replaced with [[#Trade List|Trade List]] packet.}}
 
  
 
== Play ==
 
== Play ==
Line 673: Line 408:
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Update Block Entity ====
+
==== Chat Message (clientbound) ====  
  
Sets the block entity associated with the block at the given location.
+
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"
 
{| class="wikitable"
Line 685: Line 422:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x09
+
  |rowspan="3"| {{change|0x0F|0x0E}}
 
  |rowspan="3"| Play
 
  |rowspan="3"| Play
 
  |rowspan="3"| Client
 
  |rowspan="3"| Client
  | Location
+
  | JSON Data
 +
| [[Chat]]
 +
| Limited to 32767 bytes
 +
|-
 
  | Position
 
  | Position
|
 
|-
 
| Action
 
| Unsigned Byte
 
| The type of update to perform, see below
 
|-
 
| NBT Data
 
| [[NBT|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''': {{change|Declare a shulker box, no data appears to be sent and the client seems to do fine without this packet. Perhaps it is a leftover from earlier versions?}}
 
* '''11''': Declare a bed
 
* '''12''': {{Change||Set data of a jigsaw block}}
 
* '''13''': {{Change||Set items in a campfire}}
 
 
==== Open Horse Window ====
 
 
{{Change||This packet is used exclusively for opening the horse GUI.  [[#Open Window|Open Window]] is used for all other GUIs, and now has ID 0x59.}}
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="3"| 0x14
 
|rowspan="3"| Play
 
|rowspan="3"| Client
 
| Window ID?
 
 
  | Byte
 
  | Byte
  |
+
  | 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar).
  |-
+
  |- {{added}}
  | Number of slots?
+
  | Sender
  | VarInt
+
  | 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.
|-
 
| Entity ID?
 
| Integer
 
  |
 
 
  |}
 
  |}
  
Line 748: Line 441:
 
{{Main|Chunk Format}}
 
{{Main|Chunk Format}}
 
{{See also|#Unload Chunk}}
 
{{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).
 
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).
Line 759: Line 454:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="9"| 0x22
+
  |rowspan="11"| {{change|0x22|0x20}}
  |rowspan="9"| Play
+
  |rowspan="11"| Play
  |rowspan="9"| Client
+
  |rowspan="11"| Client
 
  | Chunk X
 
  | Chunk X
 
  | Int
 
  | Int
Line 777: Line 472:
 
  | VarInt
 
  | 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).
 
  | 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).
  |- {{Added}}
+
  |-
 
  | Heightmaps
 
  | Heightmaps
 
  | [[NBT]]
 
  | [[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).
+
  | 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.
 +
|- {{Added}}
 +
| Biomes length
 +
| Optional VarInt
 +
| Size of the following array.  Not present if full chunk is false.
 +
|-
 +
| Biomes
 +
| Optional array of {{change|Integer|VarInt}}
 +
| {{change|1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks.|Possibly something else.}}  Not present if full chunk is false.
 
  |-  
 
  |-  
 
  | Size
 
  | Size
Line 795: Line 498:
 
  |-
 
  |-
 
  | Block entities
 
  | Block entities
  | Array of [[NBT]]
+
  | 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.
 
  | All block entities in the chunk.  Use the x, y, and z tags in the NBT to determine their positions.
 
  |}
 
  |}
  
===== Data structure =====
+
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.
 +
 
 +
{{Change||The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.}}
 +
 
 +
==== Update Light ====
  
The data section of the packet contains most of the useful data for the chunk.
+
Updates light levels for a chunk.
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
!colspan="2"| Field Name
 +
!colspan="2"| Field Type
 +
! Notes
 +
|-
 +
|rowspan="11"| {{change|0x25|0x23}}
 +
|rowspan="11"| Play
 +
|rowspan="11"| Client
 +
|colspan="2"| Chunk X
 +
|colspan="2"| VarInt
 +
| Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|-
 +
|colspan="2"| Chunk Z
 +
|colspan="2"| VarInt
 +
| Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|- {{added}}
 +
|colspan="2"| Trust Edges
 +
|colspan="2"| Boolean
 +
| If edges should be trusted for light updates.
 +
|
 
  |-
 
  |-
  ! Field Name
+
  |colspan="2"| Sky Light Mask
  ! Field Type
+
  |colspan="2"| VarInt
  ! Notes
+
  | 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)
 
  |-
 
  |-
  | Data
+
  |colspan="2"| Block Light Mask
  | Array of [[#Chunk Section structure|Chunk Section]]
+
  |colspan="2"| VarInt
  | The number of elements in the array is equal to the number of bits set in Primary Bit Mask. Sections are sent bottom-to-top, i.e. the first section, if sent, extends from Y=0 to Y=15.
+
  | Mask containing 18 bits, with the same order as sky light
 
  |-
 
  |-
  | Biomes
+
  |colspan="2"| Empty Sky Light Mask
  | Optional Int Array
+
  |colspan="2"| VarInt
  | Only sent if Ground-Up Continuous is true; 256 entries if present
+
  | 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.
  |}
 
 
 
===== Chunk Section structure =====
 
 
 
A Chunk Section is defined in terms of other [[data types]]. A Chunk Section consists of the following fields:
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
! Field Name
+
  |colspan="2"| Empty Block Light Mask
! Field Type
+
  |colspan="2"| VarInt
! Notes
+
  | Mask containing 18 bits, which indicates sections that have 0 for all their block light valuesIf 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.
  |- {{added}}
 
| Block count
 
  | Short
 
  | Number of non-air blocks present in the chunk section, for lighting purposes"Non-air" is defined as any block other than air, cave air, and void air (in particular, note that fluids such as water are still counted).
 
 
  |-
 
  |-
  | Bits Per Block
+
  |rowspan="2"| Sky Light arrays
  | Unsigned Byte
+
| Length
  | Determines how many bits are used to encode a block. Note that not all numbers are valid here.
+
|rowspan="2"| Array
 +
  | VarInt
 +
  | Length of the following array in bytes (always 2048)
 
  |-
 
  |-
  | Palette
+
  | Sky Light array
  | Varies
+
  | Array of 2048 bytes
  | See below for the format.
+
  | 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.
 
  |-
 
  |-
  | Data Array Length
+
  |rowspan="2"| Block Light arrays
 +
| Length
 +
|rowspan="2"| Array
 
  | VarInt
 
  | VarInt
  | Number of longs in the following array
+
  | Length of the following array in bytes (always 2048)
 
  |-
 
  |-
  | Data Array
+
  | Block Light array
  | Array of Long
+
  | Array of 2048 bytes
  | Compacted list of 4096 indices pointing to state IDs in the Palette
+
  | 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.
|- {{removed}}
 
| Block Light
 
  | Byte Array
 
| Half byte per block
 
|- {{removed}}
 
| Sky Light
 
| Optional Byte Array
 
| Only if in the Overworld; half byte per block
 
 
  |}
 
  |}
  
Data Array{{change|, Block Light, and Sky Light are|is}} given for each block with increasing x coordinates, within rows of increasing z coordinates, within layers of increasing y coordinates. {{change|For the half-byte light arrays, even-indexed items (those with an even x coordinate, starting at 0) are packed into the ''low bits'', odd-indexed into the ''high bits''.}}
+
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.
  
==== Map Data ====
+
==== Join Game ====
  
Updates a rectangular area on a {{Minecraft Wiki|map}} item.
+
See [[Protocol Encryption]] for information on logging in.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 867: Line 581:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="17"| 0x26
+
  |rowspan="17"| {{change|0x26|0x24}}
 
  |rowspan="17"| Play
 
  |rowspan="17"| Play
 
  |rowspan="17"| Client
 
  |rowspan="17"| Client
  |colspan="2"| Map ID
+
  | Entity ID
  |colspan="2"| VarInt
+
| Int
  | Map ID of the map being modified
+
| The player's Entity ID (EID)
 +
|-
 +
  | Is hardcore
 +
| Boolean
 +
  |
 
  |-
 
  |-
  |colspan="2"| Scale
+
  | Gamemode
  |colspan="2"| Byte
+
| Unsigned 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)
+
| 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. {{change|Bit 3 (0x8) is the hardcore flag.}}
  |-  
+
|- {{Added}}
  |colspan="2"| Tracking Position
+
  | Previous Gamemode
  |colspan="2"| Boolean
+
| Unsigned Byte
  | Specifies whether player and item frame icons are shown
+
  | 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. (More information needed)
 +
  |- {{Added}}
 +
  | World Count
 +
| VarInt
 +
| Size of the following array
 +
|- {{Added}}
 +
  | World Names
 +
| Array of Identifier
 +
  | Identifiers for all worlds on the server
 
  |- {{Added}}
 
  |- {{Added}}
  |colspan="2"| Locked
+
  | Dimension Codec
  |colspan="2"| Boolean
+
  | [[NBT|NBT Tag Compound]]
  | True if the map has been locked in a cartography table
+
  | The full extent of these is still unknown, but the tag represents a dimension and biome registry. See below for the vanilla default.
|-
 
|colspan="2"| Icon Count
 
|colspan="2"| VarInt
 
| Number of elements in the following array
 
 
  |-
 
  |-
  |rowspan="5"| Icon
+
  | Dimension
  | Type
+
| {{change|Int Enum|[[NBT|NBT Tag Compound]]}}
  |rowspan="6"| Array
+
  | {{change|-1: The Nether, 0: The Overworld, 1: The End|Valid dimensions are defined per dimension registry sent before this}}
  | VarInt enum
+
  |- {{Added}}
  | See below
+
| World Name
 +
  | Identifier
 +
  | Name of the world being spawned into
 
  |-
 
  |-
  | X
+
  | Hashed seed
  | Byte
+
  | Long
  | Map coordinates: -128 for furthest left, +127 for furthest right
+
  | First 8 bytes of the SHA-256 hash of the world's seed.
 
  |-
 
  |-
  | Z
+
  | Max Players
  | Byte
+
  | Unsigned Byte
  | Map coordinates: -128 for highest, +127 for lowest
+
  | Was once used by the client to draw the player list, but now is ignored
 +
|- {{Removed}}
 +
| Level Type
 +
| String Enum (16)
 +
| default, flat, largeBiomes, amplified, customized, buffet, default_1_1
 
  |-
 
  |-
  | Direction
+
  | View Distance
  | Byte
+
  | VarInt
  | 0-15
+
  | Render distance (2-32)
 
  |-
 
  |-
  | Has Display Name
+
  | Reduced Debug Info
 
  | Boolean
 
  | 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.
 
  |-
 
  |-
  | Display Name
+
  | Enable respawn screen
  | Optional [[Chat]]
+
  | Boolean
  | Only present if previous Boolean is true
+
  | Set to false when the doImmediateRespawn gamerule is true
  |-  
+
  |- {{Added}}
  |colspan="2"| Columns
+
  | Is Debug
  |colspan="2"| Byte
+
  | Boolean
| Number of columns updated
+
  | True if the world is a {{Minecraft Wiki|debug mode}} world; debug mode worlds cannot be modified and have predefined blocks
|-
+
  |- {{Added}}
|colspan="2"| Rows
+
  | Is Flat
|colspan="2"| Optional Byte
+
  | Boolean
  | Only if Columns is more than 0; number of rows updated
+
  | 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
|-
 
|colspan="2"| X
 
|colspan="2"| Optional Byte
 
| Only if Columns is more than 0; x offset of the westernmost column
 
|-
 
|colspan="2"| Z
 
|colspan="2"| Optional Byte
 
| Only if Columns is more than 0; z offset of the northernmost row
 
  |-
 
  |colspan="2"| Length
 
  |colspan="2"| Optional VarInt
 
  | Only if Columns is more than 0; length of the following array
 
|-
 
|colspan="2"| Data
 
|colspan="2"| Optional Array of Unsigned Byte
 
| 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).
+
{{Need Info|The format has changed in 20w28a}}
  
Types are based off of rows and columns in <code>map_icons.png</code>:
+
Example of Dimension codec CompoundTag sent by the server:
 +
    ListTag (Type: CompoundTag) "dimension":
 +
        CompoundTag:
 +
            StringTag "name" value: 'minecraft:overworld'
 +
            ByteTag "natural": 1
 +
            Some more attributes ...
 +
 
 +
Known attributes :
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Name
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Values
 
  |-
 
  |-
  ! Icon type
+
  | name
  ! Result
+
  | String
 +
|colspan="2"| Dimension's name
 +
| "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
 
  |-
 
  |-
  | 0
+
  | natural
  | White arrow (players)
+
| Byte
 +
|colspan="2"| Is it a standard overworld like dimension
 +
  | 1: true, 0: false
 
  |-
 
  |-
  | 1
+
  | ambient_light
  | Green arrow (item frames)
+
| Float
 +
|colspan="2"| Ambient light
 +
  | 0.0 to 1.0
 
  |-
 
  |-
  | 2
+
  | has_ceiling
  | Red arrow
+
| Byte
 +
|colspan="2"| Does the dimension have blocks on top ? Like the nether
 +
  | 1: true, 0: false
 
  |-
 
  |-
  | 3
+
  | has_skylight
  | Blue arrow
+
  | Byte
 +
|colspan="2"| Does the dimension have natural sky light
 +
| 1: true, 0: false
 
  |-
 
  |-
  | 4
+
  | fixed_time
  | White cross
+
  | Long
 +
|colspan="2"| Set fixed minecraft clock time
 +
| 0 to 12000
 
  |-
 
  |-
  | 5
+
  | shrunk
  | Red pointer
+
  | Byte
 +
|colspan="2"| Used to set how Cords are scaled for the dimension.
 +
| 1: true, 0: false
 
  |-
 
  |-
  | 6
+
  | ultrawarm
  | White circle (off-map players)
+
  | Byte
 +
|colspan="2"| Sets if Ice and Water evaporate. (Like in the nether)
 +
| 1: true, 0: false
 
  |-
 
  |-
  | 7
+
  | has_raids
  | Small white circle (far-off-map players)
+
  | Byte
 +
|colspan="2"| ?
 +
| 1: true, 0: false
 
  |-
 
  |-
  | 8
+
  | respawn_anchor_works
  | Mansion
+
  | Byte
 +
|colspan="2"| Wether or not respawn anchor can be used
 +
| 1: true, 0: false
 
  |-
 
  |-
  | 9
+
  | bed_works
  | Temple
+
  | Byte
 +
|colspan="2"| Wether or not beds can be used
 +
| 1: true, 0: false
 
  |-
 
  |-
  | 10
+
  | piglin_safe
  | White Banner
+
  | Byte
 +
|colspan="2"| ?
 +
| 1: true, 0: false
 
  |-
 
  |-
  | 11
+
  | logical_height
  | Orange Banner
+
  | Int
 +
|colspan="2"| Maybe the world's max height in blocks ?
 +
| 0-256
 
  |-
 
  |-
  | 12
+
  | infiniburn
  | Magenta Banner
+
  | String
 +
|colspan="2"| ?
 +
| "" or minecraft resource "minecraft:..."
 +
|}
 +
 
 +
==== Unlock Recipes ====
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 13
+
  |rowspan="14"| {{Change|0x37|0x35}}
  | Light Blue Banner
+
|rowspan="14"| Play
 +
  |rowspan="14"| Client
 
  |-
 
  |-
  | 14
+
  | Action
  | Yellow Banner
+
  | VarInt
 +
| 0: init, 1: add, 2: remove
 
  |-
 
  |-
  | 15
+
  | Crafting Recipe Book Open
  | Lime Banner
+
  | Boolean
 +
| If true, then the crafting recipe book will be open when the player opens its inventory.
 
  |-
 
  |-
  | 16
+
  | Crafting Recipe Book Filter Active
  | Pink Banner
+
  | Boolean
 +
| If true, then the filtering option is active when the players opens its inventory.
 
  |-
 
  |-
  | 17
+
  | Smelting Recipe Book Open
  | Gray Banner
+
  | Boolean
 +
| If true, then the smelting recipe book will be open when the player opens its inventory.
 
  |-
 
  |-
  | 18
+
  | Smelting Recipe Book Filter Active
  | Light Gray Banner
+
  | Boolean
 +
| If true, then the filtering option is active when the players opens its inventory.
 +
|- {{added}}
 +
| Blast Furance Recipe Book Open
 +
| Boolean
 +
| If true, then the blast furnace recipe book will be open when the player opens its inventory.
 +
|- {{added}}
 +
| Blast Furance Recipe Book Filter Active
 +
| Boolean
 +
| If true, then the filtering option is active when the players opens its inventory.
 +
|- {{added}}
 +
| Smoker Recipe Book Open
 +
| Boolean
 +
| If true, then the smoker recipe book will be open when the player opens its inventory.
 +
|- {{added}}
 +
| Smoker Recipe Book Filter Active
 +
| Boolean
 +
| If true, then the filtering option is active when the players opens its inventory.
 
  |-
 
  |-
  | 19
+
  | Array size 1
  | Cyan Banner
+
  | VarInt
 +
| Number of elements in the following array
 
  |-
 
  |-
  | 20
+
  | Recipe IDs
  | Purple Banner
+
| Array of Identifier
 +
  |
 
  |-
 
  |-
  | 21
+
  | Array size 2
  | Blue Banner
+
  | Optional VarInt
 +
| Number of elements in the following array, only present if mode is 0 (init)
 
  |-
 
  |-
  | 22
+
  | Recipe IDs
  | Brown Banner
+
  | 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.
 +
 
 +
==== 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.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | 23
+
  |rowspan="10"| {{Change|0x3B|0x39}}
  | Green Banner
+
|rowspan="10"| Play
 +
|rowspan="10"| Client
 +
| Dimension
 +
| {{change|Int Enum|[[NBT|NBT Tag Compound]]}}
 +
| {{change|-1: The Nether, 0: The Overworld, 1: The End|Valid dimensions are defined per dimension registry sent in [[#Join Game|Join Game]]}}
 +
|- {{Added}}
 +
| World Name
 +
| Identifier
 +
  | Name of the world being spawned into
 
  |-
 
  |-
  | 24
+
  | Hashed seed
  | Red Banner
+
  | Long
  |-
+
  | First 8 bytes of the SHA-256 hash of the world's seed.
  | 25
+
  |- {{Added}}
  | Black Banner
+
| Gamemode
  |-
+
| Unsigned Byte
  | 26
+
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included
  | Treasure marker
+
|- {{Added}}
 +
| Previous Gamemode
 +
| Unsigned Byte
 +
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. (More information needed)
 +
|- {{Removed}}
 +
| Level Type
 +
| String (16)
 +
  | Same as [[#Join Game|Join Game]]
 +
  |- {{Added}}
 +
  | Is Debug
 +
  | Boolean
 +
| True if the world is a {{Minecraft Wiki|debug mode}} world; debug mode worlds cannot be modified and have predefined blocks
 +
|- {{Added}}
 +
| 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
 +
|- {{added}}
 +
| 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.
 
  |}
 
  |}
  
==== Open Book ====
+
{{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.}}
  
Sent when a player right clicks with a signed book. This tells the client to open the book GUI.
+
==== Multi Block Change ====
  
{| class="wikitable" {{Added}}
+
{| class="wikitable" {{added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 1,048: Line 884:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x2C
+
  |rowspan="4"| {{Change|0x10|0x3B}}
  |rowspan="1"| Play
+
  |rowspan="4"| Play
  |rowspan="1"| Client
+
  |rowspan="4"| Client
  | Hand
+
  |
  | VarInt enum
+
| Long
  | 0: Main hand, 1: Off hand
+
| Chunk section coordinate (encoded chunk x and z with each 22 bits, and section y with 20 bits, from left to right)
 +
|- {{added}}
 +
|
 +
| Boolean
 +
|
 +
|-
 +
| Array size
 +
  | VarInt
 +
  | Number of elements in the following array
 +
|-
 +
|
 +
| 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).
 
  |}
 
  |}
  
==== Entity Sound Effect ====
+
==== Entity Properties ====
  
Plays a sound effect from an entity.
+
Sets {{Minecraft Wiki|Attribute|attributes}} on the given entity.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,064: Line 912:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x4F
+
  |rowspan="6"| {{change|0x59|0x58}}
  |rowspan="5"| Play
+
  |rowspan="6"| Play
  |rowspan="5"| Client
+
  |rowspan="6"| Client
  | Sound ID
+
  |colspan="2"| Entity ID
 +
|colspan="2"| VarInt
 +
|
 +
|-
 +
|colspan="2"| Number Of Properties
 +
|colspan="2"| Int
 +
| Number of elements in the following array
 +
|-
 +
|rowspan="4"| Property
 +
| Key
 +
|rowspan="4"| Array
 +
| {{Change|String (64)|Identifier}}
 +
| See below
 +
|-
 +
| Value
 +
| Double
 +
| See below
 +
|-
 +
| Number Of Modifiers
 
  | VarInt
 
  | VarInt
  | ID of hardcoded sound event ([https://pokechu22.github.io/Burger/18w48a.html#sounds events] as of 18w48a)
+
  | Number of elements in the following array
 +
|-
 +
| Modifiers
 +
| Array of Modifier Data
 +
| See {{Minecraft Wiki|Attribute#Modifiers}}. Modifier Data defined below.
 +
|}
 +
 
 +
Known Key values (see also {{Minecraft Wiki|Attribute#Modifiers}}):
 +
 
 +
{| class="wikitable"
 
  |-
 
  |-
  | Sound Category
+
! Key
  | VarInt Enum
+
! Default
  | The category that this sound will be played from ([https://gist.github.com/konwboj/7c0c380d3923443e9d55 current categories])
+
! Min
 +
! Max
 +
! Label
 +
|-
 +
| {{change|generic.maxHealth|generic.max_health}}
 +
| 20.0
 +
| 0.0
 +
| 1024.0
 +
| Max Health
 +
|-
 +
  | {{change|generic.followRange|generic.follow_range}}
 +
  | 32.0
 +
  | 0.0
 +
| 2048.0
 +
| Follow Range
 +
|-
 +
| {{change|generic.knockbackResistance|generic.knockback_resistance}}
 +
| 0.0
 +
| 0.0
 +
| 1.0
 +
| Knockback Resistance
 +
|-
 +
| {{change|generic.movementSpeed|generic.movement_speed}}
 +
| 0.7
 +
| 0.0
 +
| 1024.0
 +
| Movement Speed
 +
|-
 +
| {{change|generic.attackDamage|generic.attack_damage}}
 +
| 2.0
 +
| 0.0
 +
| 2048.0
 +
| Attack Damage
 +
|-
 +
| {{change|generic.attackSpeed|generic.attack_speed}}
 +
| 4.0
 +
| 0.0
 +
| 1024.0
 +
| Attack Speed
 +
|-
 +
| {{change|generic.flyingSpeed|generic.flying_speed}}
 +
| 0.4
 +
| 0.0
 +
| 1024.0
 +
| Flying Speed
 +
|-
 +
| generic.armor
 +
| 0.0
 +
| 0.0
 +
| 30.0
 +
| Armor
 +
|-
 +
| {{change|generic.armorToughness|generic.armor_toughness}}
 +
| 0.0
 +
| 0.0
 +
| 20.0
 +
| Armor Toughness
 +
|-
 +
| {{change|generic.attackKnockback|generic.attack_knockback}}
 +
| 0.0
 +
| 0.0
 +
| 5.0
 +
| &mdash;
 +
|-
 +
| generic.luck
 +
| 0.0
 +
| -1024.0
 +
| 1024.0
 +
| Luck
 +
|-
 +
| {{change|horse.jumpStrength|horse.jump_strength}}
 +
| 0.7
 +
| 0.0
 +
| 2.0
 +
| Jump Strength
 
  |-
 
  |-
  | Entity ID
+
  | {{change|zombie.spawnReinforcements|zombie.spawn_reinforcements}}
  | VarInt
+
| 0.0
  |
+
| 0.0
 +
  | 1.0
 +
  | Spawn Reinforcements Chance
 
  |-
 
  |-
  | Volume
+
  | generic.reachDistance
  | Float
+
  | 5.0
  | 1.0 is 100%, capped between 0.0 and 1.0 by Notchian clients
+
  | 0.0
 +
| 1024.0
 +
| Player Reach Distance (Forge only)
 
  |-
 
  |-
  | Pitch
+
  | forge.swimSpeed
  | Float
+
  | 1.0
  | Float between 0.5 and 2.0 by Notchian clients
+
  | 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"| {{Change|0x55|0x57}}
+
  | 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
|- {{added}}
 
| Entity Tags
 
  | (See below)
 
| IDs are entity type IDs
 
 
  |}
 
  |}
 +
 +
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.
  
 
==== Declare Recipes ====
 
==== Declare Recipes ====
Line 1,132: Line 1,088:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| {{Change|0x54|0x56}}
+
  |rowspan="4"| {{change|0x5B|0x5A}}
  |rowspan="5"| Play
+
  |rowspan="4"| Play
  |rowspan="5"| Client
+
  |rowspan="4"| Client
 
  |colspan="2"| Num Recipes
 
  |colspan="2"| Num Recipes
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
 
  | Number of elements in the following array
 
  | Number of elements in the following array
 
  |-
 
  |-
  |rowspan="4"| Recipe
+
  |rowspan="3"| Recipe
|{{removed}}| Recipe ID
 
|rowspan="4"| Array
 
|{{removed}}| Identifier
 
|{{removed}}|
 
|-
 
| Type
 
| {{Change|String|Identifier}}
 
| The recipe serializer, see below
 
|- {{Added}}
 
 
  | Recipe ID
 
  | Recipe ID
 +
|rowspan="3"| Array
 
  | Identifier
 
  | Identifier
 
  |
 
  |
 +
|-
 +
| Type
 +
| String
 +
| The recipe type, see below
 
  |-
 
  |-
 
  | Data
 
  | Data
Line 1,158: Line 1,110:
 
  |}
 
  |}
  
Recipe serializers:
+
Recipe types:
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Serializer
+
  ! Type
 
  ! Description
 
  ! Description
 
  ! Data
 
  ! Data
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_shapeless</code>
+
  | <code>crafting_shapeless</code>
 
  | Shapeless crafting recipe.  All items in the ingredient list must be present, but in any order/slot.
 
  | Shapeless crafting recipe.  All items in the ingredient list must be present, but in any order/slot.
 
  | As follows:
 
  | As follows:
Line 1,190: Line 1,142:
 
     |}
 
     |}
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_shaped</code>
+
  | <code>crafting_shaped</code>
 
  | Shaped crafting recipe.  All items must be present in the same pattern (which may be flipped horizontally or translated)
 
  | Shaped crafting recipe.  All items must be present in the same pattern (which may be flipped horizontally or translated)
 
  | As follows:
 
  | As follows:
Line 1,219: Line 1,171:
 
     |}
 
     |}
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_armordye</code>
+
  | <code>crafting_special_armordye</code>
 
  | Recipe for dying leather armor
 
  | Recipe for dying leather armor
  | None
+
  |rowspan="13"| None
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_bookcloning</code>
+
  | <code>crafting_special_bookcloning</code>
 
  | Recipe for copying contents of written books
 
  | Recipe for copying contents of written books
| None
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_mapcloning</code>
+
  | <code>crafting_special_mapcloning</code>
 
  | Recipe for copying maps
 
  | Recipe for copying maps
| None
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_mapextending</code>
+
  | <code>crafting_special_mapextending</code>
 
  | Recipe for adding paper to maps
 
  | Recipe for adding paper to maps
| None
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_firework_rocket</code>
+
  | <code>crafting_special_firework_rocket</code>
 
  | Recipe for making firework rockets
 
  | Recipe for making firework rockets
| None
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_firework_star</code>
+
  | <code>crafting_special_firework_star</code>
 
  | Recipe for making firework stars
 
  | Recipe for making firework stars
| None
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_firework_star_fade</code>
+
  | <code>crafting_special_firework_star_fade</code>
 
  | Recipe for making firework stars fade between multiple colors
 
  | Recipe for making firework stars fade between multiple colors
| None
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_repairitem</code>
+
  | <code>crafting_special_repairitem</code>
 
  | Recipe for repairing items via crafting
 
  | Recipe for repairing items via crafting
| None
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_tippedarrow</code>
+
  | <code>crafting_special_tippedarrow</code>
 
  | Recipe for crafting tipped arrows
 
  | Recipe for crafting tipped arrows
| None
 
 
  |-
 
  |-
  | <code{{change||minecraft:}}>crafting_special_bannerduplicate</code>
+
  | <code>crafting_special_bannerduplicate</code>
 
  | Recipe for copying banner patterns
 
  | Recipe for copying banner patterns
| None
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_banneraddpattern</code>
+
  | <code>crafting_special_banneraddpattern</code>
 
  | Recipe for adding patterns to banners
 
  | Recipe for adding patterns to banners
| None
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_shielddecoration</code>
+
  | <code>crafting_special_shielddecoration</code>
 
  | Recipe for applying a banner's pattern to a shield
 
  | Recipe for applying a banner's pattern to a shield
| None
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_shulkerboxcoloring</code>
+
  | <code>crafting_special_shulkerboxcoloring</code>
 
  | Recipe for recoloring a shulker box
 
  | Recipe for recoloring a shulker box
| None
 
|- {{Added}}
 
| <code>crafting_special_suspiciousstew</code>
 
| Recipe for crafting suspicious stew with various affects.
 
| None
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}smelting</code>
+
  | <code>smelting</code>
 
  | Smelting recipe
 
  | Smelting recipe
  |rowspan="4"| All of these have the same format, as follows:
+
  |rowspan="4"| As follows:
 
   {| class="wikitable"
 
   {| class="wikitable"
 
     ! Name
 
     ! Name
Line 1,301: Line 1,237:
 
     | Cooking time
 
     | Cooking time
 
     | VarInt
 
     | VarInt
 +
    |
 +
    |}
 +
|-
 +
| <code>blasting</code>
 +
| Blast furnace recipe
 +
|-
 +
| <code>smoking</code>
 +
| Smoker recipe
 +
|-
 +
| <code>campfire_cooking</code>
 +
| Campfire recipe
 +
|-
 +
| <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]]
 
     |
 
     |
 
     |}
 
     |}
 
  |- {{Added}}
 
  |- {{Added}}
  | <code>minecraft:blasting</code>
+
  | <code>smithing</code>
  | Recipes in a blast furnace.
+
  | Smithing table recipe
  |- {{Added}}
+
  | As follows:
| <code>minecraft:smoking</code>
+
  {| class="wikitable"
| Recipes in a smoker.
+
    ! Name
|- {{Added}}
+
    ! Type
| <code>minecraft:campfire_cooking</code>
+
    ! Description
| Recipes in a campfire.
+
    |-
 +
    | Base
 +
    | Ingredient
 +
    | First item
 +
    |-
 +
    | Addition
 +
    | Ingredient
 +
    | Second item
 +
    |-
 +
    | Result
 +
    | [[Slot]]
 +
    |
 +
    |}
 
  |}
 
  |}
  
Line 1,330: Line 1,308:
 
  |}
 
  |}
  
==== Update Light ====
+
=== Serverbound ===
 +
 
 +
==== 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.
  
Updates light levels for a chunk.
+
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"
 
{| class="wikitable"
Line 1,342: Line 1,326:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="8"| 0x58
+
  |rowspan="7"| 0x0E
  |rowspan="8"| Play
+
  |rowspan="7"| Play
  |rowspan="8"| Client
+
  |rowspan="7"| Server
  | Chunk X
+
  | Entity ID
 
  | VarInt
 
  | VarInt
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | The ID of the entity to interact
 
  |-
 
  |-
  | Chunk Z
+
  | Type
  | VarInt
+
  | VarInt Enum
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | 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
 
  |-
 
  |-
  | Sky Light Mask
+
  | Target Z
  | VarInt
+
  | Optional Float
  | 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)
+
  | Only if Type is interact at
 
  |-
 
  |-
  | Block Light Mask
+
  | Hand
  | VarInt
+
  | Optional VarInt Enum
  | Mask containing 18 bits, with the same order as sky light
+
  | Only if Type is interact or interact at; 0: main hand, 1: off hand
 +
|- {{Added}}
 +
| Sneaking
 +
| Boolean
 +
| If the client is sneaking.
 +
|}
 +
 
 +
==== Generate Structure ====
 +
 
 +
Sent when Generate is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
 +
 
 +
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | Empty Sky Light Mask
+
  |rowspan="3"| 0x0F
  | VarInt
+
|rowspan="3"| Play
  | 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.
+
  |rowspan="3"| Server
 +
  | Location
 +
  | Position
 +
  | Block entity location
 
  |-
 
  |-
  | Empty Block Light Mask
+
  | Levels
 
  | VarInt
 
  | 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.
+
  | Value of the levels slider/max depth to generate
 
  |-
 
  |-
  | Sky Light arrays
+
  | Keep Jigsaws
  | Array of arrays of 2048 bytes
+
  | Boolean
  | 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
 
| Array of arrays 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.
+
==== Player Abilities (serverbound) ====
  
==== Open Window ====
+
{{change|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.}}
  
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. {{change||For horses, use [[#Open Horse Window|Open Horse Window]]}}
+
The vanilla client sends this packet when the player starts/stops flying with the Flags parameter changed accordingly. {{change|All other parameters are ignored by the vanilla server.}}
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,392: Line 1,400:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| {{change|0x14|0x59}}
+
  |rowspan="3"| {{change|0x19|0x1A}}
  |rowspan="5"| Play
+
  |rowspan="3"| Play
  |rowspan="5"| Client
+
  |rowspan="3"| Server
  | Window ID
+
  | Flags
  | {{change|Unsigned Byte|VarInt}}
+
  | Byte
  | A unique id number for the window to be displayed. Notchian server implementation is a counter, starting at 1.
+
  | Bit mask. {{change|0x08: damage disabled (god mode), 0x04: can fly, }}0x02: is flying{{change|, 0x01: is Creative}}
|-
 
| Window Type
 
| {{change|String (32)|VarInt}}
 
| The window type to use for display. {{change|See [[Inventory]] for a list|contained in the <code>minecraft:menu</code> regisry}}.
 
|-
 
| Window Title
 
| [[Chat]]
 
| The title of the window
 
 
  |- {{removed}}
 
  |- {{removed}}
  | Number Of Slots
+
  | Flying Speed
  | Unsigned Byte
+
  | Float
  | Number of slots in the window (excluding the number of slots in the player inventory). Always 0 for non-storage windows (e.g. Workbench, Anvil).
+
  |  
 
  |- {{removed}}
 
  |- {{removed}}
  | Entity ID
+
  | Walking Speed
  | Optional Int
+
  | Float
  | EntityHorse's EID. Only sent when Window Type is “EntityHorse”
+
  |  
 
  |}
 
  |}
  
==== Trade List ====
+
==== Set Displayed Recipe ====
  
The list of trades a villager NPC is offering.
+
Replaces Recipe Book Data, type 0.
  
{| class="wikitable"
+
{| class="wikitable" {{Added}}
 
  ! 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="10"| 0x5A
+
  |rowspan="1"| 0x1E
  |rowspan="10"| Play
+
  |rowspan="1"| Play
  |rowspan="10"| Client
+
  |rowspan="1"| Server
|-
+
  | Recipe ID
| colspan="2" | Window ID
+
  | Identifier
| colspan="2" | VarInt
+
  |
  | The ID of the window that is open; this is an int rather than a byte.
 
|-
 
| colspan="2" | Size
 
| colspan="2" | Byte
 
| The number of trades in the following array
 
|-
 
| rowspan="7" | Trades
 
| Input item 1
 
| rowspan="7" | 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
 
 
  |}
 
  |}
  
=== Serverbound ===
+
==== Set Recipe Book State ====
  
==== Recipe Book Data ====
+
Replaces Recipe Book Data, type 1.
  
{| class="wikitable"
+
{| class="wikitable" {{Added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="11"| 0x1B
+
  |rowspan="3"| 0x1F
  |rowspan="11"| Play
+
  |rowspan="3"| Play
  |rowspan="11"| Server
+
  |rowspan="3"| Server
  |colspan="2"| Type
+
  | Book ID
  | VarInt
+
  | VarInt enum
| Determines the format of the rest of the packet
+
  | 0: crafting, 1: furnace, 2: blast furnace, 3: smoker
|-
 
! Type
 
! Field Name
 
!
 
!
 
|-
 
  | 0: Displayed Recipe
 
| Recipe ID
 
| Identifier
 
| A recipe ID
 
 
  |-
 
  |-
  |rowspan="8"| 1: Recipe Book States
+
  | Book Open
| Crafting Recipe Book Open
 
 
  | Boolean
 
  | 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
+
  | Filter Active
| Boolean
 
| Whether the player has the smelting recipe book filter option currently active.
 
|- {{Added}}
 
| 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.
 
|- {{Added}}
 
| 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.
 
|- {{Added}}
 
| Smoking Recipe Book Open
 
| Boolean
 
|
 
|- {{Added}}
 
| Smoking Recipe Filter Active
 
 
  | Boolean
 
  | Boolean
 
  |
 
  |
 
  |}
 
  |}
  
The Recipe Book Status type is sent when one of the states changes.
+
==== Update Jigsaw Block ====
  
==== Player Block Placement ====
+
Sent when Done is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
  
 
{| class="wikitable"
 
{| class="wikitable"
|-
 
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 1,547: Line 1,476:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="9"| 0x29
+
  |rowspan="7"| {{Change|0x27|0x28}}
  |rowspan="9"| Play
+
  |rowspan="7"| Play
  |rowspan="9"| Server
+
  |rowspan="7"| Server
|{{removed}}| Location
 
|{{removed}}| Position
 
|{{removed}}| Block position
 
|- {{removed}}
 
| Face
 
| VarInt Enum
 
| The face on which the block is placed (as documented at [[#Player Digging|Player Digging]])
 
|-
 
| Hand
 
| VarInt Enum
 
| The hand from which the block is placed; 0: main hand, 1: off hand
 
|- {{added}}
 
 
  | Location
 
  | Location
 
  | Position
 
  | Position
  | Block position
+
  | Block entity location
  |- {{added}}
+
  |- {{Removed}}
  | Face
+
  | Attachment type
  | VarInt Enum
+
  | Identifier
  | The face on which the block is placed (as documented at [[#Player Digging|Player Digging]])
+
  |  
 +
|- {{Added}}
 +
| Name
 +
| Identifier
 +
|
 +
|- {{Added}}
 +
| Target
 +
| Identifier
 +
|
 +
|-
 +
| {{Change|Target pool|Pool}}
 +
| Identifier
 +
|
 +
|-
 +
| Final state
 +
| String
 +
| "Turns into" on the GUI, <code>final_state</code> in NBT
 +
|- {{Added}}
 +
| Joint type
 +
| String
 +
| <code>rollable</code> if the attached piece can be rotated, else <code>aligned</code>
 +
|}
 +
 
 +
==== Entity Equipment ====
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
!colspan="2"| Field Name
 +
!colspan="2"| Field Type
 +
! Notes
 
  |-
 
  |-
  | Cursor Position X
+
  |rowspan="5"| 0x47
  | Float
+
  |rowspan="5"| Play
  | The position of the crosshair on the block, from 0 to 1 increasing from west to east
+
  |rowspan="5"| Client
 +
|colspan="2"| Entity ID
 +
|colspan="2"| VarInt
 +
| Entity's EID
 +
|- {{Removed}}
 +
|colspan="2"| Slot
 +
|colspan="2"| VarInt Enum
 +
| Equipment slot. 0: main hand, 1: off hand, 2–5: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet)
 +
|- {{Removed}}
 +
|colspan="2"| Item
 +
|colspan="2"| [[Slot Data|Slot]]
 +
|
 
  |-
 
  |-
  | Cursor Position Y
+
  |rowspan="2"| Equipment
  | Float
+
| Slot
  | The position of the crosshair on the block, from 0 to 1 increasing from bottom to top
+
  |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.
 
  |-
 
  |-
  | Cursor Position Z
+
  | Item
  | Float
+
  | [[Slot Data|Slot]]
| The position of the crosshair on the block, from 0 to 1 increasing from north to south
+
  |
|- {{added}}
 
| 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 pixel 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.
 
 
{{Change||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).}}
 
  
 
== Handshaking ==
 
== Handshaking ==
Line 1,618: Line 1,569:
 
  | Protocol Version
 
  | Protocol Version
 
  | VarInt
 
  | VarInt
  | See [[protocol version numbers]] (currently {{change|404|455}})
+
  | See [[protocol version numbers]] (currently {{change|578|748}})
 
  |-
 
  |-
 
  | Server Address
 
  | Server Address
 
  | String
 
  | String
  | Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information.
+
  | 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
 
  | Server Port
Line 1,647: Line 1,598:
 
=== Clientbound ===
 
=== Clientbound ===
  
No changes so far.
+
==== Login Success ====
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="2"| 0x02
 +
|rowspan="2"| Login
 +
|rowspan="2"| Client
 +
| UUID
 +
| {{Change|String (36)|UUID}}
 +
| {{Change|Unlike in other packets, this field contains the UUID as a string with hyphens}}.
 +
|-
 +
| Username
 +
| String (16)
 +
|
 +
|}
 +
 
 +
This packet switches the connection state to [[#Play|play]].
  
 
=== Serverbound ===
 
=== Serverbound ===

Latest revision as of 21:52, 6 August 2020

This page documents the changes from the last stable Minecraft release (currently 1.15.2, protocol 578) to the current pre-release (currently 1.16.2-pre3, protocol 748). Note that this page contains bleeding-edge information that may not be completely or correctly documented.

One who wishes to commandeer the merging of this into Protocol when an update is made must be sure to respect any changes that may have occurred to the respective packets there.

Contents

Data types

The UUID type is now also sometimes encoded by the Notchian server as an array of four 32-bit integers, from most significant to least significant (matching the new format used on entity NBT). This representation is identical to using 16 bytes, two 64-bit integers, or one 128-bit integers.

Packets

ID Packet name Documentation
Handshaking serverbound
0x00 Handshake Current Pre
Play clientbound
0x02 Spawn Weather Entity Current
0x03 0x02 Spawn Living Entity Current (unchanged)
0x04 0x03 Spawn Painting Current (unchanged)
0x05 0x04 Spawn Player Current (unchanged)
0x06 0x05 Entity Animation (clientbound) Current (unchanged)
0x07 0x06 Statistics Current (unchanged)
0x08 0x07 Acknowledge Player Digging Current (unchanged)
0x09 0x08 Block Break Animation Current (unchanged)
0x0A 0x09 Block Entity Data Current (unchanged)
0x0B 0x0A Block Action Current (unchanged)
0x0C 0x0B Block Change Current (unchanged)
0x0D 0x0C Boss Bar Current (unchanged)
0x0E 0x0D Server Difficulty Current (unchanged)
0x0F 0x0E Chat Message (clientbound) Current Pre
0x11 0x0F Tab-Complete (clientbound) Current (unchanged)
0x12 0x10 Declare Commands Current (unchanged)
0x13 0x11 Window Confirmation (clientbound) Current (unchanged)
0x14 0x12 Close Window (clientbound) Current (unchanged)
0x15 0x13 Window Items Current (unchanged)
0x16 0x14 Window Property Current (unchanged)
0x17 0x15 Set Slot Current (unchanged)
0x18 0x16 Set Cooldown Current (unchanged)
0x19 0x17 Plugin Message (clientbound) Current (unchanged)
0x1A 0x18 Named Sound Effect Current (unchanged)
0x1B 0x19 Disconnect (play) Current (unchanged)
0x1C 0x1A Entity Status Current (unchanged)
0x1D 0x1B Explosion Current (unchanged)
0x1E 0x1C Unload Chunk Current (unchanged)
0x1F 0x1D Change Game State Current (unchanged)
0x20 0x1E Open Horse Window Current (unchanged)
0x21 0x1F Keep Alive (clientbound) Current (unchanged)
0x22 0x20 Chunk Data Current Pre
0x23 0x21 Effect Current (unchanged)
0x24 0x22 Particle Current (unchanged)
0x25 0x23 Update Light Current Pre
0x26 0x24 Join Game Current Pre
0x27 0x25 Map Data Current (unchanged)
0x28 0x26 Trade List Current (unchanged)
0x29 0x27 Entity Position Current (unchanged)
0x2A 0x28 Entity Position and Rotation Current (unchanged)
0x2B 0x29 Entity Rotation Current (unchanged)
0x2C 0x2A Entity Movement Current (unchanged)
0x2D 0x2B Vehicle Move (clientbound) Current (unchanged)
0x2E 0x2C Open Book Current (unchanged)
0x2F 0x2D Open Window Current (unchanged)
0x30 0x2E Open Sign Editor Current (unchanged)
0x31 0x2F Craft Recipe Response Current (unchanged)
0x32 0x30 Player Abilities (clientbound) Current (unchanged)
0x33 0x31 Combat Event Current (unchanged)
0x34 0x32 Player Info Current (unchanged)
0x35 0x33 Face Player Current (unchanged)
0x36 0x34 Player Position And Look (clientbound) Current (unchanged)
0x37 0x35 Unlock Recipes Current Pre
0x38 0x36 Destroy Entities Current (unchanged)
0x39 0x37 Remove Entity Effect Current (unchanged)
0x3A 0x38 Resource Pack Send Current (unchanged)
0x3B 0x39 Respawn Current Pre
0x3C 0x3A Entity Head Look Current (unchanged)
0x10 0x3B Multi Block Change Current Pre
0x3D 0x3C Select Advancement Tab Current (unchanged)
0x3E 0x3D World Border Current (unchanged)
0x3F 0x3E Camera Current (unchanged)
0x40 0x3F Held Item Change (clientbound) Current (unchanged)
0x41 0x40 Update View Position Current (unchanged)
0x42 0x41 Update View Distance Current (unchanged)
0x47 Entity Equipment Current Pre
0x4E 0x42 Spawn Position Current (unchanged)
0x4F 0x4E Time Update Current (unchanged)
0x50 0x4F Title Current (unchanged)
0x51 0x50 Entity Sound Effect Current (unchanged)
0x52 0x51 Sound Effect Current (unchanged)
0x53 0x52 Stop Sound Current (unchanged)
0x54 0x53 Player List Header And Footer Current (unchanged)
0x55 0x54 NBT Query Response Current (unchanged)
0x56 0x55 Collect Item Current (unchanged)
0x57 0x56 Entity Teleport Current (unchanged)
0x58 0x57 Advancements Current (unchanged)
0x59 0x58 Entity Properties Current Pre
0x5A 0x59 Entity Effect Current (unchanged)
0x5B 0x5A Declare Recipes Current Pre
0x5C 0x5B Tags Current (unchanged)
Play serverbound
0x0E Interact Entity Current Pre
0x0F Generate Structure Pre
0x0F 0x10 Keep Alive (serverbound) Current (unchanged)
0x10 0x11 Lock Difficulty Current (unchanged)
0x11 0x12 Player Position Current (unchanged)
0x12 0x13 Player Position And Rotation (serverbound) Current (unchanged)
0x13 0x14 Player Rotation Current (unchanged)
0x14 0x15 Player Movement Current (unchanged)
0x15 0x16 Vehicle Move (serverbound) Current (unchanged)
0x16 0x17 Steer Boat Current (unchanged)
0x17 0x18 Pick Item Current (unchanged)
0x18 0x19 Craft Recipe Request Current (unchanged)
0x19 0x1A Player Abilities (serverbound) Current Pre
0x1A 0x1B Player Digging Current (unchanged)
0x1B 0x1C Entity Action Current (unchanged)
0x1C 0x1D Steer Vehicle Current (unchanged)
0x1D Recipe Book Data Current
0x1E Set Displayed Recipe Pre
0x1F Set Recipe Book State Pre
0x1E 0x20 Name Item Current (unchanged)
0x1F 0x21 Resource Pack Status Current (unchanged)
0x20 0x22 Advancement Tab Current (unchanged)
0x21 0x23 Select Trade Current (unchanged)
0x22 0x24 Set Beacon Effect Current (unchanged)
0x23 0x25 Held Item Change (serverbound) Current (unchanged)
0x24 0x26 Update Command Block Current (unchanged)
0x25 0x27 Update Command Block Minecart Current (unchanged)
0x26 0x28 Creative Inventory Action Current (unchanged)
0x27 0x29 Update Jigsaw Block Current Pre
0x28 0x2A Update Structure Block Current (unchanged)
0x29 0x2B Update Sign Current (unchanged)
0x2A 0x2C Animation (serverbound) Current (unchanged)
0x2B 0x2D Spectate Current (unchanged)
0x2C 0x2E Player Block Placement Current (unchanged)
0x2D 0x2F Use Item Current (unchanged)
Login clientbound
0x02 Login Success Current Pre

New/modified data types

No changes so far.

Entity Metadata

FishingHook

Extends Entity.

Index Type Meaning Default
7 VarInt Hooked entity id + 1, or 0 if there is no hooked entity 0
8 Boolean Is catchable False

Abstract Arrow

Extends Entity.

Abstract base class for Tipped Arrow (which is used for regular arrows as well as tipped ones) and Spectral Arrow.

Index Type Meaning Default
7 Byte Bit mask Meaning 0
0x01 Is critical
0x02 Is noclip (used by loyalty tridents when returning)
8 OptUUID Unused Empty
9 8 Byte Peircing level 0

Tipped Arrow

Extends Abstract Arrow.

Used for both tipped and regular arrows. If not tipped, then color is set to -1 and no tipped arrow particles are used.

Index Type Meaning Default
10 9 VarInt Color (-1 for no particles) -1

Spectral Arrow

Extends Abstract Arrow.

No additional metadata.

Trident

Extends Abstract Arrow.

Index Type Meaning Default
10 9 VarInt Loyalty level (enchantment) 0
11 10 Boolean Has enchantment glint False

Strider

Extends Animal.

Index Type Meaning Default
16 VarInt Total time to "boost" with warped fungus on a stick for 0
17 Boolean Is shaking (true unless riding a vehicle or on or in a block tagged with strider_warm_blocks (default: lava)) false
18 Boolean Has saddle false

Hoglin

Extends Animal.

Index Type Meaning Default
16 Boolean Is immune to zombification false

Zoglin

Extends Monster.

Index Type Meaning Default
15 Boolean Is baby false

Base Piglin

Extends Monster.

Index Type Meaning Default
15 Boolean Is immune to zombification false

Piglin

Extends Base Piglin.

Index Type Meaning Default
16 Boolean Is baby false
17 Boolean Is charging crossbow false
18 Boolean Is dancing false

Piglin Brute

Extends Base Piglin.

No additional metadata.

Wolf

Extends TameableAnimal.

Index Type Meaning Default
18 Boolean Is begging false
19 VarInt Collar color (values are those used with dyes) 14 (Red)
20 VarInt Anger time 0

Zombie Pigman Zombified Piglin

Extends Zombie.

No additional metadata.

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

No changes so far.

Play

Clientbound

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
0x0F 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.

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
0x22 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 Integer 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.

Update Light

Updates light levels for a chunk.

Packet ID State Bound To Field Name Field Type Notes
0x25 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.

Join Game

See Protocol Encryption for information on logging in.

Packet ID State Bound To Field Name Field Type Notes
0x26 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. Bit 3 (0x8) is the hardcore flag.
Previous Gamemode Unsigned Byte 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The 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 Int Enum NBT Tag Compound -1: The Nether, 0: The Overworld, 1: The End 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 Unsigned Byte Was once used by the client to draw the player list, but now is ignored
Level Type String Enum (16) default, flat, largeBiomes, amplified, customized, buffet, default_1_1
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:
The format has changed in 20w28a

Example of Dimension codec CompoundTag sent by the server:

   ListTag (Type: CompoundTag) "dimension":
       CompoundTag: 
           StringTag "name" value: 'minecraft:overworld'
           ByteTag "natural": 1
           Some more attributes ...

Known attributes :

Name Type Meaning Values
name String Dimension's name "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
natural Byte Is it a standard overworld like dimension 1: true, 0: false
ambient_light Float Ambient light 0.0 to 1.0
has_ceiling Byte Does the dimension have blocks on top ? Like the nether 1: true, 0: false
has_skylight Byte Does the dimension have natural sky light 1: true, 0: false
fixed_time Long Set fixed minecraft clock time 0 to 12000
shrunk Byte Used to set how Cords are scaled for the dimension. 1: true, 0: false
ultrawarm Byte Sets if Ice and Water evaporate. (Like in the nether) 1: true, 0: false
has_raids Byte ? 1: true, 0: false
respawn_anchor_works Byte Wether or not respawn anchor can be used 1: true, 0: false
bed_works Byte Wether or not beds can be used 1: true, 0: false
piglin_safe Byte ? 1: true, 0: false
logical_height Int Maybe the world's max height in blocks ? 0-256
infiniburn String ? "" or minecraft resource "minecraft:..."

Unlock Recipes

Packet ID State Bound To Field Name Field Type Notes
0x37 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.

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
0x3B 0x39 Play Client Dimension Int Enum NBT Tag Compound -1: The Nether, 0: The Overworld, 1: The End 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)
Level Type String (16) Same as Join Game
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.

Multi Block Change

Packet ID State Bound To Field Name Field Type Notes
0x10 0x3B Play Client Long Chunk section coordinate (encoded chunk x and z with each 22 bits, and section y with 20 bits, from left to right)
Boolean
Array size VarInt Number of elements in the following array
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).

Entity Properties

Sets attributes on the given entity.

Packet ID State Bound To Field Name Field Type Notes
0x59 0x58 Play Client Entity ID VarInt
Number Of Properties Int Number of elements in the following array
Property Key Array String (64) 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.maxHealth generic.max_health 20.0 0.0 1024.0 Max Health
generic.followRange generic.follow_range 32.0 0.0 2048.0 Follow Range
generic.knockbackResistance generic.knockback_resistance 0.0 0.0 1.0 Knockback Resistance
generic.movementSpeed generic.movement_speed 0.7 0.0 1024.0 Movement Speed
generic.attackDamage generic.attack_damage 2.0 0.0 2048.0 Attack Damage
generic.attackSpeed generic.attack_speed 4.0 0.0 1024.0 Attack Speed
generic.flyingSpeed generic.flying_speed 0.4 0.0 1024.0 Flying Speed
generic.armor 0.0 0.0 30.0 Armor
generic.armorToughness generic.armor_toughness 0.0 0.0 20.0 Armor Toughness
generic.attackKnockback generic.attack_knockback 0.0 0.0 5.0
generic.luck 0.0 -1024.0 1024.0 Luck
horse.jumpStrength horse.jump_strength 0.7 0.0 2.0 Jump Strength
zombie.spawnReinforcements 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.

Declare Recipes

Packet ID State Bound To Field Name Field Type Notes
0x5B 0x5A Play Client Num Recipes VarInt Number of elements in the following array
Recipe Recipe ID Array Identifier
Type String The recipe type, see below
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.

Serverbound

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

Player Abilities (serverbound)

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.

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.

Packet ID State Bound To Field Name Field Type Notes
0x19 0x1A Play Server Flags Byte Bit mask. 0x08: damage disabled (god mode), 0x04: can fly, 0x02: is flying, 0x01: is Creative
Flying Speed Float
Walking Speed Float

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

Update Jigsaw Block

Sent when Done is pressed on the Jigsaw Block interface.

Packet ID State Bound To Field Name Field Type Notes
0x27 0x28 Play Server Location Position Block entity location
Attachment type Identifier
Name Identifier
Target Identifier
Target pool 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

Entity Equipment

Packet ID State Bound To Field Name Field Type Notes
0x47 Play Client Entity ID VarInt Entity's EID
Slot VarInt Enum Equipment slot. 0: main hand, 1: off hand, 2–5: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet)
Item Slot
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

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 578 748)
Server Address String 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

Status

Clientbound

No changes so far.

Serverbound

No changes so far.

Login

Clientbound

Login Success

Packet ID State Bound To Field Name Field Type Notes
0x02 Login Client UUID String (36) UUID Unlike in other packets, this field contains the UUID as a string with hyphens.
Username String (16)

This packet switches the connection state to play.

Serverbound

No changes so far.