Difference between revisions of "Pre-release protocol"

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(→‎Declare Commands: Flags are now always a byte)
(1.16.3, no changes other than PVN)
 
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This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.12.2, protocol 340]]) to the current pre-release (currently [[Protocol version numbers|17w50a, protocol 351]]). 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|1.16.3, protocol 753]]). 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 ===
  
==== Other definitions ====
+
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.
 
 
===== Global palette =====
 
A table/dictionary/palette mapping nonnegative integers to block states. {{change|The block state IDs can be constructed from this table by multiplying what the Minecraft Wiki calls “block IDs” by 16 and adding the metadata/damage value (or in most programming languages block_id << 4 {{!}} metadata).|Block state IDs are created in a linear fashion based off of order of assignmentOne block state ID allocated for each unique block state for a block; if a block has multiple properties then the number of allocated states is the product of the number of values for each property.  A current list of properties and state ID ranges is found on [http://pokechu22.github.io/Burger/17w48a.html burger].}}
 
  
 
=== Packets ===
 
=== Packets ===
Line 25: Line 22:
 
  |-
 
  |-
 
!colspan="4"| Play clientbound
 
!colspan="4"| Play clientbound
{{PacketList|0x07|Statistics}}
+
{{PacketList|0x02|Spawn Weather Entity|pre=removed}}
{{PacketList|0x0B|Block Change}}
+
{{PacketList|{{change|0x03|0x02}}|Spawn Living Entity|pre=unchanged}}
{{PacketList|{{change|0x0F|0x0E}}|Chat Message (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x04|0x03}}|Spawn Painting|pre=unchanged}}
{{PacketList|{{change|0x10|0x0F}}|Multi Block Change}}
+
{{PacketList|{{change|0x05|0x04}}|Spawn Player|pre=unchanged}}
{{PacketList|{{change|0x0E|0x10}}|Tab-Complete (clientbound)}}
+
{{PacketList|{{change|0x06|0x05}}|Entity Animation (clientbound)|pre=unchanged}}
{{PacketList|0x11|Declare Commands|rel=added}}
+
{{PacketList|{{change|0x07|0x06}}|Statistics|pre=unchanged}}
{{PacketList|{{change|0x11|0x12}}|Confirm Transaction (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x08|0x07}}|Acknowledge Player Digging|pre=unchanged}}
{{PacketList|{{change|0x12|0x13}}|Close Window (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x09|0x08}}|Block Break Animation|pre=unchanged}}
{{PacketList|{{change|0x13|0x14}}|Open Window|pre=unchanged}}
+
{{PacketList|{{change|0x0A|0x09}}|Block Entity Data|pre=unchanged}}
{{PacketList|{{change|0x14|0x15}}|Window Items|pre=unchanged}}
+
{{PacketList|{{change|0x0B|0x0A}}|Block Action|pre=unchanged}}
{{PacketList|{{change|0x15|0x16}}|Window Property|pre=unchanged}}
+
{{PacketList|{{change|0x0C|0x0B}}|Block Change|pre=unchanged}}
{{PacketList|{{change|0x16|0x17}}|Set Slot|pre=unchanged}}
+
{{PacketList|{{change|0x0D|0x0C}}|Boss Bar|pre=unchanged}}
{{PacketList|{{change|0x17|0x18}}|Set Cooldown|pre=unchanged}}
+
{{PacketList|{{change|0x0E|0x0D}}|Server Difficulty|pre=unchanged}}
{{PacketList|{{change|0x18|0x19}}|Plugin Message (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x0F|0x0E}}|Chat Message (clientbound)}}
{{PacketList|{{change|0x19|0x1A}}|Named Sound Effect}}
+
{{PacketList|{{change|0x11|0x0F}}|Tab-Complete (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x1A|0x1B}}|Disconnect (play)|pre=unchanged}}
+
{{PacketList|{{change|0x12|0x10}}|Declare Commands|pre=unchanged}}
{{PacketList|{{change|0x1B|0x1C}}|Entity Status|pre=unchanged}}
+
{{PacketList|{{change|0x13|0x11}}|Window Confirmation (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x1C|0x1D}}|Explosion|pre=unchanged}}
+
{{PacketList|{{change|0x14|0x12}}|Close Window (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x1D|0x1E}}|Unload Chunk|pre=unchanged}}
+
{{PacketList|{{change|0x15|0x13}}|Window Items|pre=unchanged}}
{{PacketList|{{change|0x1E|0x1F}}|Change Game State|pre=unchanged}}
+
{{PacketList|{{change|0x16|0x14}}|Window Property|pre=unchanged}}
{{PacketList|{{change|0x1F|0x20}}|Keep Alive (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x17|0x15}}|Set Slot|pre=unchanged}}
{{PacketList|{{change|0x20|0x21}}|Chunk Data}}
+
{{PacketList|{{change|0x18|0x16}}|Set Cooldown|pre=unchanged}}
{{PacketList|{{change|0x21|0x22}}|Effect|pre=unchanged}}
+
{{PacketList|{{change|0x19|0x17}}|Plugin Message (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x22|0x23}}|Particle}}
+
{{PacketList|{{change|0x1A|0x18}}|Named Sound Effect|pre=unchanged}}
{{PacketList|{{change|0x23|0x24}}|Join Game|pre=unchanged}}
+
{{PacketList|{{change|0x1B|0x19}}|Disconnect (play)|pre=unchanged}}
{{PacketList|{{change|0x24|0x25}}|Map|pre=unchanged}}
+
{{PacketList|{{change|0x1C|0x1A}}|Entity Status|pre=unchanged}}
{{PacketList|{{change|0x25|0x26}}|Entity|pre=unchanged}}
+
{{PacketList|{{change|0x1D|0x1B}}|Explosion|pre=unchanged}}
{{PacketList|{{change|0x26|0x27}}|Entity Relative Move|pre=unchanged}}
+
{{PacketList|{{change|0x1E|0x1C}}|Unload Chunk|pre=unchanged}}
{{PacketList|{{change|0x27|0x28}}|Entity Look And Relative Move|pre=unchanged}}
+
{{PacketList|{{change|0x1F|0x1D}}|Change Game State|pre=unchanged}}
{{PacketList|{{change|0x28|0x29}}|Entity Look|pre=unchanged}}
+
{{PacketList|{{change|0x20|0x1E}}|Open Horse Window|pre=unchanged}}
{{PacketList|{{change|0x29|0x2A}}|Vehicle Move (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x21|0x1F}}|Keep Alive (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x2A|0x2B}}|Open Sign Editor|pre=unchanged}}
+
{{PacketList|{{change|0x22|0x20}}|Chunk Data}}
{{PacketList|{{change|0x2B|0x2C}}|Craft Recipe Response}}
+
{{PacketList|{{change|0x23|0x21}}|Effect|pre=unchanged}}
{{PacketList|{{change|0x2C|0x2D}}|Player Abilities (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x24|0x22}}|Particle|pre=unchanged}}
{{PacketList|{{change|0x2D|0x2E}}|Combat Event|pre=unchanged}}
+
{{PacketList|{{change|0x25|0x23}}|Update Light}}
{{PacketList|{{change|0x2E|0x2F}}|Player List Item|pre=unchanged}}
+
{{PacketList|{{change|0x26|0x24}}|Join Game}}
{{PacketList|{{change|0x2F|0x30}}|Player Position And Look (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x27|0x25}}|Map Data|pre=unchanged}}
{{PacketList|{{change|0x30|0x31}}|Use Bed|pre=unchanged}}
+
{{PacketList|{{change|0x28|0x26}}|Trade List|pre=unchanged}}
{{PacketList|{{change|0x31|0x32}}|Unlock Recipes}}
+
{{PacketList|{{change|0x29|0x27}}|Entity Position|pre=unchanged}}
{{PacketList|{{change|0x32|0x33}}|Destroy Entities|pre=unchanged}}
+
{{PacketList|{{change|0x2A|0x28}}|Entity Position and Rotation|pre=unchanged}}
{{PacketList|{{change|0x33|0x34}}|Remove Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x2B|0x29}}|Entity Rotation|pre=unchanged}}
{{PacketList|{{change|0x34|0x35}}|Resource Pack Send|pre=unchanged}}
+
{{PacketList|{{change|0x2C|0x2A}}|Entity Movement|pre=unchanged}}
{{PacketList|{{change|0x35|0x36}}|Respawn|pre=unchanged}}
+
{{PacketList|{{change|0x2D|0x2B}}|Vehicle Move (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x36|0x37}}|Entity Head Look|pre=unchanged}}
+
{{PacketList|{{change|0x2E|0x2C}}|Open Book|pre=unchanged}}
{{PacketList|{{change|0x37|0x38}}|Select Advancement Tab|pre=unchanged}}
+
{{PacketList|{{change|0x2F|0x2D}}|Open Window|pre=unchanged}}
{{PacketList|{{change|0x38|0x39}}|World Border|pre=unchanged}}
+
{{PacketList|{{change|0x30|0x2E}}|Open Sign Editor|pre=unchanged}}
{{PacketList|{{change|0x39|0x3A}}|Camera|pre=unchanged}}
+
{{PacketList|{{change|0x31|0x2F}}|Craft Recipe Response|pre=unchanged}}
{{PacketList|{{change|0x3A|0x3B}}|Held Item Change (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x32|0x30}}|Player Abilities (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x3B|0x3C}}|Display Scoreboard|pre=unchanged}}
+
{{PacketList|{{change|0x33|0x31}}|Combat Event|pre=unchanged}}
{{PacketList|{{change|0x3C|0x3D}}|Entity Metadata|pre=unchanged}}
+
{{PacketList|{{change|0x34|0x32}}|Player Info|pre=unchanged}}
{{PacketList|{{change|0x3D|0x3E}}|Attach Entity|pre=unchanged}}
+
{{PacketList|{{change|0x35|0x33}}|Face Player|pre=unchanged}}
{{PacketList|{{change|0x3E|0x3F}}|Entity Velocity|pre=unchanged}}
+
{{PacketList|{{change|0x36|0x34}}|Player Position And Look (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x3F|0x40}}|Entity Equipment|pre=unchanged}}
+
{{PacketList|{{change|0x37|0x35}}|Unlock Recipes}}
{{PacketList|{{change|0x40|0x41}}|Set Experience|pre=unchanged}}
+
{{PacketList|{{change|0x38|0x36}}|Destroy Entities|pre=unchanged}}
{{PacketList|{{change|0x41|0x42}}|Update Health|pre=unchanged}}
+
{{PacketList|{{change|0x39|0x37}}|Remove Entity Effect|pre=unchanged}}
{{PacketList|{{change|0x42|0x43}}|Scoreboard Objective}}
+
{{PacketList|{{change|0x3A|0x38}}|Resource Pack Send|pre=unchanged}}
{{PacketList|{{change|0x43|0x44}}|Set Passengers|pre=unchanged}}
+
{{PacketList|{{change|0x3B|0x39}}|Respawn}}
{{PacketList|{{change|0x44|0x45}}|Teams|pre=unchanged}}
+
{{PacketList|{{change|0x3C|0x3A}}|Entity Head Look|pre=unchanged}}
{{PacketList|{{change|0x45|0x46}}|Update Score|pre=unchanged}}
+
{{PacketList|{{change|0x10|0x3B}}|Multi Block Change}}
{{PacketList|{{change|0x46|0x47}}|Spawn Position|pre=unchanged}}
+
{{PacketList|{{change|0x3D|0x3C}}|Select Advancement Tab|pre=unchanged}}
{{PacketList|{{change|0x47|0x48}}|Time Update|pre=unchanged}}
+
{{PacketList|{{change|0x3E|0x3D}}|World Border|pre=unchanged}}
{{PacketList|{{change|0x48|0x49}}|Title|pre=unchanged}}
+
{{PacketList|{{change|0x3F|0x3E}}|Camera|pre=unchanged}}
{{PacketList|0x4A|Stop Sound|rel=added}}
+
{{PacketList|{{change|0x40|0x3F}}|Held Item Change (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x49|0x4B}}|Sound Effect|pre=unchanged}}
+
{{PacketList|{{change|0x41|0x40}}|Update View Position|pre=unchanged}}
{{PacketList|{{change|0x4A|0x4C}}|Player List Header And Footer|pre=unchanged}}
+
{{PacketList|{{change|0x42|0x41}}|Update View Distance|pre=unchanged}}
{{PacketList|{{change|0x4B|0x4D}}|Collect Item|pre=unchanged}}
+
{{PacketList|0x47|Entity Equipment}}
{{PacketList|{{change|0x4C|0x4E}}|Entity Teleport|pre=unchanged}}
+
{{PacketList|{{change|0x4E|0x42}}|Spawn Position|pre=unchanged}}
{{PacketList|{{change|0x4D|0x4F}}|Advancements|pre=unchanged}}
+
{{PacketList|{{change|0x4F|0x4E}}|Time Update|pre=unchanged}}
{{PacketList|{{change|0x4E|0x50}}|Entity Properties|pre=unchanged}}
+
{{PacketList|{{change|0x50|0x4F}}|Title|pre=unchanged}}
{{PacketList|{{change|0x4F|0x51}}|Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x51|0x50}}|Entity Sound Effect|pre=unchanged}}
{{PacketList|0x52|Declare Recipes|rel=added}}
+
{{PacketList|{{change|0x52|0x51}}|Sound Effect|pre=unchanged}}
{{PacketList|0x53|Tags|rel=added}}
+
{{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|{{change|0x02|0x01}}|Chat Message (serverbound)|pre=unchanged}}
+
{{PacketList|0x0E|Interact Entity}}
{{PacketList|{{change|0x03|0x02}}|Client Status|pre=unchanged}}
+
{{PacketList|0x0F|Generate Structure|rel=added}}
{{PacketList|{{change|0x04|0x03}}|Client Settings|pre=unchanged}}
+
{{PacketList|{{change|0x0F|0x10}}|Keep Alive (serverbound)|pre=unchanged}}
{{PacketList|{{change|0x01|0x04}}|Tab-Complete (serverbound)}}
+
{{PacketList|{{change|0x10|0x11}}|Lock Difficulty|pre=unchanged}}
{{PacketList|0x12|Craft Recipe Request}}
+
{{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}}
 
  |}
 
  |}
  
 
== New/modified data types ==
 
== New/modified data types ==
  
=== [[Slot]] ===
+
No changes so far.
 +
 
 +
== Entity Metadata ==
 +
 
 +
{{#vardefine:meta_prerelease|1}}
 +
 
 +
=== FishingHook ===
 +
 
 +
{{Metadata inherit|FishingHook|inherits=Entity|start_at=7}}
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Name
+
  ! Index
 
  ! Type
 
  ! Type
  ! Meaning
+
  !style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  | {{Change|Block ID|Item ID}}
+
  | {{Metadata id|}}
  | Short
+
  | VarInt
  | The {{Minecraft Wiki|Data values#Block IDs|item{{change|/block}} ID}}. A value of <code>-1</code> signifies that the slot is empty, and no further data follows. {{Change||Item IDs are now uniquely defined and are completely independent of block IDs.}}
+
  |colspan="2"| Hooked entity id + 1, or 0 if there is no hooked entity
  |-
+
| 0
  | Item Count
+
  |- {{Added}}
| Optional Byte
+
  | {{Metadata id|added}}
  | Not present if Block ID is <code>-1</code>.
+
  | Boolean
  |- style="background-color: #f4cccc; text-decoration: line-through;"
+
  |colspan="2"| Is catchable
| Item Damage
+
  | False
| Optional Short
 
| Not present if Block ID is <code>-1</code>.
 
|-
 
| NBT
 
  | Optional NBT
 
| Not present if Block ID is <code>-1</code>. If 0, there is no NBT data, and no further data follows. Otherwise the byte is the start of an NBT blob as shown below:
 
 
  |}
 
  |}
  
== Block Actions ==
+
=== Abstract Arrow ===
  
No changes so far.
+
{{Metadata inherit|Abstract Arrow|inherits=Entity|start_at=7}}
  
== Plugin Channels ==
+
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>MC|StopSound</code> ===
+
{| class="wikitable"
 
+
! Index
{{Change|''Server to client''}}
+
! Type
 
+
!style="width: 250px;" colspan="2"| Meaning
{{Change|Used to implement {{Minecraft Wiki|Commands#StopSound|the <code>/stopsound</code> command}}. Stops a sound that is currently playing on the client.}}
+
! Default
 
+
|-
{| class="wikitable" style="background-color: #f4cccc; text-decoration: line-through;"
+
| rowspan="3" | {{Metadata id|}}
  ! Field name
+
  | rowspan="3" | Byte
  ! Field type
+
! Bit mask
  ! Notes
+
! Meaning
 +
| rowspan="3" | 0
 +
  |-
 +
  | 0x01
 +
  | Is critical
 
  |-
 
  |-
  | Sound category
+
  | 0x02
  | String
+
  | Is noclip (used by loyalty tridents when returning)
  | Should be one of the sound categories used in [[Protocol#Named Sound Effect|Named Sound Effect]], but if it's invalid or empty then it is (intentionally) treated as ''all'' sound categories.
+
|- {{removed}}
 +
  | {{Metadata id|removed}}
 +
| OptUUID
 +
|colspan="2"| Unused
 +
| Empty
 
  |-
 
  |-
  | Sound name
+
  | {{Metadata id|}}
  | String
+
  | Byte
  | A [http://pokechu22.github.io/Burger/1.11.html#sounds sound effect name]. If left empty, ''all'' sounds are stopped.
+
  |colspan="2"| Peircing level
 +
  | 0
 
  |}
 
  |}
  
{{Change|Emptiness of sound category or sound name can be combined, IE a empty sound name but a set sound category will stop all sounds in the given category.}}
+
=== Tipped Arrow ===
  
{{Change||This plugin channel has been replaced by the [[#Stop sound|stop sound]] packet.}}
+
{{Metadata inherit|Tipped Arrow|inherits=Abstract Arrow}}
  
== Play ==
+
Used for both tipped and regular arrows. If not tipped, then color is set to -1 and no tipped arrow particles are used.
 
 
=== Clientbound ===
 
 
 
==== Block Change ====
 
 
 
Fired whenever a block is changed within the render distance.
 
 
 
{{Warning2|Changing a block in a chunk that is not loaded is not a stable action.  The Notchian client currently uses a ''shared'' empty chunk which is modified for all block changes in unloaded chunks; while in 1.9 this chunk never renders in older versions the changed block will appear in all copies of the empty chunk.  Servers should avoid sending block changes in unloaded chunks and clients should ignore such packets.}}
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! Index
  ! State
+
  ! Type
! Bound To
+
  !style="width: 250px;" colspan="2"| Meaning
! Field Name
+
  ! Default
! Field Type
 
  ! Notes
 
|-
 
|rowspan="2"| 0x0B
 
|rowspan="2"| Play
 
|rowspan="2"| Client
 
  | Location
 
| Position
 
| Block Coordinates
 
 
  |-
 
  |-
  | Block ID
+
  | {{Metadata id|}}
 
  | VarInt
 
  | VarInt
  | The new block state ID for the block as given in the [[#global palette|global palette]].  {{change|(When reading data: <code>type {{=}} id >> 4</code>, <code>meta {{=}} id & 15</code>, when writing data: <code>id {{=}} type << 4 {{!}} (meta & 15)</code>)|See that section for more information.}}
+
  |colspan="2"| Color (-1 for no particles)
 +
| -1
 
  |}
 
  |}
  
 +
=== Spectral Arrow ===
  
==== Statistics ====
+
{{Metadata inherit|Spectral Arrow|inherits=Abstract Arrow}}
  
Sent as a response to [[#Client_Status|Client Status]] (id 1).
+
No additional metadata.
 +
 
 +
=== Trident ===
 +
 
 +
{{Metadata inherit|Trident|inherits=Abstract Arrow}}
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! Index
  ! State
+
  ! Type
! Bound To
+
  !style="width: 250px;" colspan="2"| Meaning
  !colspan="2"| Field Name
+
  ! Default
!colspan="2"| Field Type
 
  ! Notes
 
|-
 
|rowspan="6"| 0x07
 
|rowspan="6"| Play
 
|rowspan="6"| Client
 
|colspan="2"| Count
 
|colspan="2"| VarInt
 
| Number of elements in the following array
 
 
  |-
 
  |-
  |rowspan="4"| Statistic
+
  | {{Metadata id|}}
|style="background-color: #f4cccc; text-decoration: line-through;"| Name
 
|rowspan="4"| Array
 
|style="background-color: #f4cccc; text-decoration: line-through;"| String (32767)
 
|style="background-color: #f4cccc; text-decoration: line-through;"| [https://gist.github.com/Alvin-LB/8d0d13db00b3c00fd0e822a562025eff https://gist.github.com/Alvin-LB/8d0d13db00b3c00fd0e822a562025eff]
 
|- style="background-color: #d9ead3;"
 
| Unknown 1
 
 
  | VarInt
 
  | VarInt
  |
+
  |colspan="2"| Loyalty level (enchantment)
|- style="background-color: #d9ead3;"
+
  | 0
| Unknown 2
 
| VarInt
 
  |
 
 
  |-
 
  |-
  | Value
+
  | {{Metadata id|}}
  | VarInt
+
  | Boolean
  | The amount to set it to
+
|colspan="2"| Has enchantment glint
 +
  | False
 
  |}
 
  |}
  
==== Multi Block Change ====
+
=== Strider ===
  
Fired whenever 2 or more blocks are changed within the same chunk on the same tick.
+
{{Metadata inherit|Strider|inherits=Animal|start_at=16}}
  
{{Warning|Changing blocks in chunks not loaded by the client is unsafe (see note on [[#Block Change|Block Change]]).}}
+
{| class="wikitable" {{added}}
 
+
  ! Index
{| class="wikitable"
+
  ! Type
  ! Packet ID
+
  !style="width: 250px;" colspan="2"| Meaning
  ! State
+
  ! Default
! Bound To
 
  !colspan="2"| Field Name
 
!colspan="2"| Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="6"| {{Change|0x10|0x0F}}
+
  | {{Metadata id|}}
  |rowspan="6"| Play
+
  | VarInt
|rowspan="6"| Client
+
  |colspan="2"| Total time to "boost" with warped fungus on a stick for
  |colspan="2"| Chunk X
+
  | 0
|colspan="2"| Int
 
  | Chunk X coordinate
 
 
  |-
 
  |-
  |colspan="2"| Chunk Z
+
  | {{Metadata id|}}
  |colspan="2"| Int
+
| Boolean
  | Chunk Z coordinate
+
  |colspan="2"| Is shaking (true unless riding a vehicle or on or in a block tagged with strider_warm_blocks (default: lava))
 +
  | false
 
  |-
 
  |-
  |colspan="2"| Record Count
+
  | {{Metadata id|}}
  |colspan="2"| VarInt
+
  | Boolean
  | Number of elements in the following array, i.e. the number of blocks affected
+
  |colspan="2"| Has saddle
|-
+
  | false
|rowspan="3"| Record
 
| Horizontal Position
 
|rowspan="3"| Array
 
  | Unsigned Byte
 
| The 4 most significant bits (<code>0xF0</code>) encode the X coordinate, relative to the chunk. The 4 least significant bits (<code>0x0F</code>) encode the Z coordinate, relative to the chunk.
 
|-
 
| Y Coordinate
 
| Unsigned Byte
 
| Y coordinate of the block
 
|-
 
| Block ID
 
| VarInt
 
| The new block state ID for the block as given in the [[#global palette|global palette]].  {{change|(When reading data: <code>type {{=}} id >> 4</code>, <code>meta {{=}} id & 15</code>, when writing data: <code>id {{=}} type << 4 {{!}} (meta & 15)</code>)|See that section for more information.}}
 
 
  |}
 
  |}
  
To decode the position into a world position:
+
=== Hoglin ===
  
<syntaxhighlight lang="java">
+
{{Metadata inherit|Hoglin|inherits=Animal|start_at=16}}
worldX = (horizPos >> 4 & 15) + (chunkX * 16);
 
worldY = vertPos;
 
worldZ = (horizPos & 15) + (chunkZ * 16);
 
</syntaxhighlight>
 
  
 +
{| class="wikitable" {{added}}
 +
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 +
|-
 +
| {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Is immune to zombification
 +
| false
 +
|}
  
==== Tab-Complete (clientbound) ====
+
=== Zoglin ===
  
{{Need Info|This is most definitely no longer an accurate description of this packet}}
+
{{Metadata inherit|Hoglin|inherits=Monster|start_at=15}}
  
The server responds with a list of auto-completions of the last word sent to it. In the case of regular chat, this is a player username. Command names and parameters are also supported. The client sorts these alphabetically before listing them.
+
{| class="wikitable" {{added}}
 
+
  ! Index
{| class="wikitable"
+
  ! Type
  ! Packet ID
+
  !style="width: 250px;" colspan="2"| Meaning
  ! State
+
  ! Default
  ! Bound To
 
! Field Name
 
! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="5"| {{Change|0x0E|0x10}}
+
  | {{Metadata id|}}
  |rowspan="5"| Play
+
  | Boolean
|rowspan="5"| Client
+
  |colspan="2"| Is baby
|style="background-color: #d9ead3;"| Transaction Id
+
  | false
|style="background-color: #d9ead3;"| VarInt
 
  |style="background-color: #d9ead3;"| This id should also be used in the tab completion response packet, or it will be ignored.
 
|- style="background-color: #d9ead3;"
 
| Start
 
| VarInt
 
|
 
|- style="background-color: #d9ead3;"
 
| Length
 
| VarInt
 
|
 
|-
 
| Count
 
| VarInt
 
| Number of elements in the following array
 
|-
 
| Matches
 
| Array of String (32767)
 
  | One eligible command, note that each command is sent separately instead of in a single string, hence the need for Count
 
 
  |}
 
  |}
  
==== Declare Commands ====
+
=== Base Piglin ===
  
{{Need Info|This information is probably incomplete/inaccurate}}
+
{{Metadata inherit|Base Piglin|inherits=Monster|start_at=15}}
  
Lists all of the commands on the server, and how they are parsed.
+
{| class="wikitable" {{added}}
 
+
  ! Index
{| class="wikitable"
+
  ! Type
  ! Packet ID
+
  !style="width: 250px;" colspan="2"| Meaning
  ! State
+
  ! Default
  ! Bound To
 
! Field Name
 
! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x11
+
  | {{Metadata id|}}
  |rowspan="3"| Play
+
  | Boolean
  |rowspan="3"| Client
+
  |colspan="2"| Is immune to zombification
| Count
+
  | false
| VarInt
 
| Length of the following array
 
|-
 
| Nodes
 
| Array of Node
 
| A array of <code>CommandNode</code>s
 
|-
 
| Root index
 
| VarInt
 
  | Index of the <code>RootCommandNode</code> in the previous array
 
 
  |}
 
  |}
  
Node:
+
=== Piglin ===
 +
 
 +
{{Metadata inherit|Piglin|inherits=Base Piglin}}
  
{| class="wikitable"
+
{| class="wikitable" {{added}}
  ! Field Name
+
  ! Index
  ! Field Type
+
  ! Type
  ! Notes
+
  !style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  | Flags
+
  | {{Metadata id|}}
  | Byte
+
  | Boolean
  |
+
  |colspan="2"| Is baby
  {| class="wikitable"
+
| false
  ! Bit mask
 
  !colspan="2"| Meaning
 
  |-
 
  |rowspan="4"| 0x03
 
  |colspan="2"| Type of the <code>CommandNode</code>
 
  |-
 
  |0
 
  |<code>RootCommandNode</code>
 
  |-
 
  |1
 
  |<code>LiteralCommandNode</code>
 
  |-
 
  |2
 
  |<code>ArgumentCommandNode</code>
 
  |-
 
  |0x04
 
  |colspan="2"| Has command
 
  |-
 
  |0x08
 
  |colspan="2"| Has redirect node
 
  |-
 
  |0x10
 
  |colspan="2"| Has custom suggestions, currently only present if the type is a <code>ArgumentCommandNode</code>
 
  |}
 
 
  |-
 
  |-
  | Children Count
+
  | {{Metadata id|}}
  | VarInt
+
  | Boolean
  | Length of the following array
+
|colspan="2"| Is charging crossbow
 +
  | false
 
  |-
 
  |-
  | Children
+
  | {{Metadata id|}}
| Array of VarInt
+
  | Boolean
| The indexes of the children <code>CommandNode</code>s within the <code>Nodes</code> array
+
  |colspan="2"| Is dancing
  |-
+
  | false
  | Redirect node
 
| Optional VarInt
 
| Only if flags & 0x08. Points to the redirect <code>CommandNode</code> within the <code>Nodes</code> array
 
|-
 
| Extra node data
 
| Extra node data
 
  | Type depends on the <code>CommandNode</code> type, see below.
 
 
  |}
 
  |}
  
Extra node data:
+
=== Piglin Brute ===
 +
 
 +
{{Metadata inherit|Piglin Brute|inherits=Base Piglin}}
 +
 
 +
No additional metadata.
 +
 
 +
=== Wolf ===
 +
 
 +
{{Metadata inherit|Wolf|inherits=TameableAnimal|start_at=18}}
 +
 
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Index
 
  ! Type
 
  ! Type
  ! Field Name
+
  !style="width: 250px;" colspan="2"| Meaning
  ! Field Type
+
  ! Default
! Notes
 
 
  |-
 
  |-
  | <code>RootCommandNode</code>
+
  | {{Metadata id|}}
  | Empty
+
  | Boolean
  | Empty
+
  |colspan="2"| Is begging
  |  
+
  | false
 
  |-
 
  |-
  | <code>LiteralCommandNode</code>
+
  | {{Metadata id|}}
| Literal
+
  | VarInt
| String (32767)
+
  |colspan="2"| Collar color (values are those {{Minecraft Wiki|Data_values#Dyes|used with dyes}})
| The text
+
  | 14 (Red)
  |-
+
  |- {{Added}}
  |rowspan="4"| <code>ArgumentCommandNode</code>
+
  | {{Metadata id|}}
| Name
+
  | VarInt
| String (32767)
+
  |colspan="2"| Anger time
  | The name of the argument
+
  | 0
|-
 
| Parser
 
| Identifier
 
| One of several known to the client, listed below.  If the client does not know the parser, reading this RequiredArgumentBuilder stops immediately (following fields are not read)
 
  |-
 
  | Properties
 
| Optional, varies
 
| See below.  Varies depending on the parser.
 
  |-
 
  | Suggests
 
| Optional Identifier
 
  | Only present if (flags & 0x10) != 0. See below for the available types.
 
 
  |}
 
  |}
  
Parsers:
+
=== {{Change|Zombie Pigman|Zombified Piglin}} ===
  
{| class="wikitable"
+
{{Metadata inherit|{{Change|Zombie Pigman|Zombified Piglin}}|inherits=Zombie|start_at=18}}
! Identifier
+
 
! Description
+
No additional metadata.
! Properties
+
 
|-
+
== Block Actions ==
| <code>brigadier:bool</code>
+
 
| Boolean value (<code>true</code> or <code>false</code>, case-sensitive)
+
No changes so far.
| None
+
 
|-
+
== Inventories ==
| <code>brigadier:double</code>
+
 
| Double
+
No changes so far.
| Specifies min and max values:
+
 
  {| class="wikitable"
+
== Plugin Channels ==
  ! Name
+
 
  ! Type
+
No changes so far.
  ! Description
+
 
  |-
+
== Play ==
  | Flags
 
  | Byte
 
  |
 
  |-
 
  | Min
 
  | Optional double
 
  | Only if flags & 0x01.  If not specified, defaults to <code>-Double.MAX_VALUE</code> (≈ -1.7976931348623157E307)
 
  |-
 
  | Max
 
  | Optional double
 
  | Only if flags & 0x02.  If not specified, defaults to <code>Double.MAX_VALUE</code> (≈ 1.7976931348623157E307)
 
  |}
 
|-
 
| <code>brigadier:float</code>
 
| Float
 
| Specifies min and max values:
 
  {| class="wikitable"
 
  ! Name
 
  ! Type
 
  ! Description
 
  |-
 
  | Flags
 
  | Byte
 
  |
 
  |-
 
  | Min
 
  | Optional float
 
  | Only if flags & 0x01.  If not specified, defaults to <code>-Float.MAX_VALUE</code> (≈ -3.4028235E38)
 
  |-
 
  | Max
 
  | Optional float
 
  | Only if flags & 0x02.  If not specified, defaults to <code>Float.MAX_VALUE</code> (≈ 3.4028235E38)
 
  |}
 
|-
 
| <code>brigadier:integer</code>
 
| Integer
 
| Specifies min and max values:
 
  {| class="wikitable"
 
  ! Name
 
  ! Type
 
  ! Description
 
  |-
 
  | Flags
 
  | Byte
 
  |
 
  |-
 
  | Min
 
  | Optional integer
 
  | Only if flags & 0x01.  If not specified, defaults to <code>Integer.MIN_VALUE</code> (-2147483648)
 
  |-
 
  | Max
 
  | Optional integer
 
  | Only if flags & 0x02.  If not specified, defaults to <code>Integer.MAX_VALUE</code> (2147483647)
 
  |}
 
|-
 
| <code>brigadier:string</code>
 
| A string
 
| A VarInt enum:
 
  {| class="wikitable"
 
  ! Value
 
  ! Name
 
  ! Description
 
  |-
 
  | 0
 
  | <code>SINGLE_WORD</code>
 
  | Reads a single word
 
  |-
 
  | 1
 
  | <code>QUOTABLE_PHRASE</code>
 
  | If it starts with a <code>"</code>, keeps reading until another <code>"</code> (allowing escaping with <code>\</code>).  Otherwise behaves the same as <code>SINGLE_WORD</code>
 
  |-
 
  | 2
 
  | <code>GREEDY_PHRASE</code>
 
  | Reads the rest of the content after the cursor.  Quotes will not be removed.
 
  |}
 
|-
 
| <code>minecraft:entity</code>
 
| A selector, player name, or UUID.
 
| Has a single flags byte:
 
  {| class="wikitable"
 
  ! Bit mask
 
  ! Meaning
 
  |-
 
  | 0x01
 
  | Only allows 1 entity/player
 
  |-
 
  | 0x02
 
  | Only allows players
 
  |}
 
|-
 
| <code>minecraft:game_profile</code>
 
| A player, online or not.  Can also use a selector, which may match one or more players (but not entities).
 
| None
 
|-
 
| <code>minecraft:block_pos</code>
 
| A location, represented as 3 numbers (which must be integers).  May use relative locations with <code>~</code>.
 
| None
 
|-
 
| <code>minecraft:vec3</code>
 
| A location, represented as 3 numbers (which may have a decimal point, but will be moved to the center of a block if none is specified).  May use relative locations with <code>~</code>.
 
| None
 
|-
 
| <code>minecraft:vec2</code>
 
| A location, represented as 2 numbers (which may have a decimal point, but will be moved to the center of a block if none is specified).  May use relative locations with <code>~</code>.
 
| None
 
|-
 
| <code>minecraft:block</code>
 
| A block state, optionally including NBT and state information.
 
| None
 
|-
 
| <code>minecraft:item</code>
 
| An item, optionally including NBT.
 
| None
 
|-
 
| <code>minecraft:color</code>
 
| A chat color.  One of the names from [[Chat#Colors]], or <code>reset</code>.  Case-insensitive.
 
| None
 
|-
 
| <code>minecraft:component</code>
 
| A JSON [[Chat]] component.
 
| None
 
|-
 
| <code>minecraft:message</code>
 
| A regular message, potentially including selectors.
 
| None
 
|-
 
| <code>minecraft:nbt</code>
 
| An NBT value, parsed using JSON-NBT rules.
 
| None
 
|-
 
| <code>minecraft:nbt_path</code>
 
| A path within an NBT value, allowing for array and member accesses.
 
| None
 
|-
 
| <code>minecraft:objective</code>
 
| A scoreboard objective.
 
| None
 
|-
 
| <code>minecraft:objective_criteria</code>
 
| A single score criterion.
 
| None
 
|-
 
| <code>minecraft:operation</code>
 
| A scoreboard operator
 
| None
 
|-
 
| <code>minecraft:particle</code>
 
| A particle effect (an identifier with extra information following it for specific particles, mirroring the [[#Particle|Particle]] packet)
 
| None
 
|-
 
| <code>minecraft:rotation</code>
 
| An angle, represented as 2 numbers (which may have a decimal point, but will be moved to the center of a block if none is specified).  May use relative locations with <code>~</code>.
 
| None
 
|-
 
| <code>minecraft:scoreboard_slot</code>
 
| A scoreboard display position slot.  <code>list</code>, <code>sidebar</code>, <code>belowName</code>, and <code>sidebar.team.${color}</code> for all chat colors (<code>reset</code> is not included)
 
| None
 
|-
 
| <code>minecraft:score_holder</code>
 
| Something that can join a team.  Allows selectors and <code>*</code>.
 
| Has a single flags byte:
 
  {| class="wikitable"
 
  ! Bit mask
 
  ! Meaning
 
  |-
 
  | 0x01
 
  | Unknown.
 
  |-
 
  | 0x02
 
  | Unknown.
 
  |}
 
|-
 
| <code>minecraft:swizzle</code>
 
| A collection of up to 3 axes.
 
| None
 
|-
 
| <code>minecraft:team</code>
 
| The name of a team.  Parsed as an unquoted string.
 
| None
 
|-
 
| <code>minecraft:item_slot</code>
 
| A name for an inventory slot.
 
| None
 
|-
 
| <code>minecraft:resource_location</code>
 
| An Identifier.
 
| None
 
|-
 
| <code>minecraft:mob_effect</code>
 
| A potion effect.
 
| None
 
|}
 
  
Suggestion types:
+
=== Clientbound ===
  
{| class="wikitable"
+
==== Chat Message (clientbound) ====
  ! Identifier
 
  ! Description
 
  |-
 
  | <code>minecraft:ask_server</code>
 
  | Sends the <code>Tab-Complete</code> packet to the server to request tab completions.
 
  |-
 
  | <code>minecraft:all_recipes</code>
 
  | Suggests all the available recipes.
 
  |-
 
  | <code>minecraft:available_sounds</code>
 
  | Suggests all the available sounds.
 
  |-
 
  | <code>minecraft:summonable_entities</code>
 
  | Suggests all the summonable entities.
 
  |}
 
  
==== Named Sound Effect ====
+
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.
{{See also|#Sound Effect}}
 
  
Used to play a sound effect on the client. Custom sounds may be added by resource packs.
+
{{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 684: Line 422:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="7"| {{Change|0x19|0x1A}}
+
  |rowspan="3"| {{change|0x0F|0x0E}}
  |rowspan="7"| Play
+
  |rowspan="3"| Play
  |rowspan="7"| Client
+
  |rowspan="3"| Client
  | Sound Name
+
  | JSON Data
  | {{Change|String (256)|Identifier}}
+
  | [[Chat]]
  | All sound effect names as of 1.12.2 can be seen [http://pokechu22.github.io/Burger/1.12.2.html#sounds here].
+
  | Limited to 32767 bytes
 
  |-
 
  |-
  | Sound Category
+
  | Position
  | VarInt Enum
+
  | Byte
  | The category that this sound will be played from ([https://gist.github.com/konwboj/7c0c380d3923443e9d55 current categories])
+
  | 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar).
|-
+
  |- {{added}}
| Effect Position X
+
  | Sender
| Int
+
  | UUID
| Effect X multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
+
  | Used by the Notchian client for the disableChat launch option. Setting both longs to 0 will always display the message regardless of the setting.
  |-
 
  | Effect Position Y
 
  | Int
 
  | Effect Y multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
 
|-
 
| Effect Position Z
 
| Int
 
| Effect Z multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
 
|-
 
| Volume
 
| Float
 
| 1 is 100%, can be more
 
|-
 
| Pitch
 
| Float
 
| Float between 0.5 and 2.0 by Notchian clients
 
 
  |}
 
  |}
  
Line 719: 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).
 
{{Change||Indexes into the global palette are still used, but since the global palette has changed, behavior is different.}}
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 732: Line 454:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="9"| {{Change|0x20|0x21}}
+
  |rowspan="11"| {{change|0x22|0x20}}
  |rowspan="9"| Play
+
  |rowspan="11"| Play
  |rowspan="9"| Client
+
  |rowspan="11"| Client
 
  | Chunk X
 
  | Chunk X
 
  | Int
 
  | Int
Line 743: Line 465:
 
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  | Ground-Up Continuous
+
  | Full chunk
 
  | Boolean
 
  | Boolean
  | See [[Chunk Format#Ground-up continuous|Chunk Format]]
+
  | See [[Chunk Format#Full chunk|Chunk Format]]
 
  |-
 
  |-
 
  | Primary Bit Mask
 
  | Primary Bit Mask
 
  | 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).
 +
|-
 +
| Heightmaps
 +
| [[NBT]]
 +
| Compound containing one long array named <code>MOTION_BLOCKING</code>, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a <code>WORLD_SURFACE</code> long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
 +
|- {{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 761: Line 495:
 
  | Number of block entities
 
  | Number of block entities
 
  | VarInt
 
  | VarInt
  | Length of the following array
+
  | Number of elements in the following array
 
  |-
 
  |-
 
  | Block entities
 
  | Block entities
Line 768: Line 502:
 
  |}
 
  |}
  
 +
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.
  
==== Particle ====
+
{{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.}}
  
Displays the named particle
+
New format, 5 bits per block, containing the following references to blocks in a palette (not shown): <span style="border: solid 2px hsl(0, 90%, 60%)">1</span><span style="border: solid 2px hsl(30, 90%, 60%)">2</span><span style="border: solid 2px hsl(60, 90%, 60%)">2</span><span style="border: solid 2px hsl(90, 90%, 60%)">3</span><span style="border: solid 2px hsl(120, 90%, 60%)">4</span><span style="border: solid 2px hsl(150, 90%, 60%)">4</span><span style="border: solid 2px hsl(180, 90%, 60%)">5</span><span style="border: solid 2px hsl(210, 90%, 60%)">6</span><span style="border: solid 2px hsl(240, 90%, 60%)">6</span><span style="border: solid 2px hsl(270, 90%, 60%)">4</span><span style="border: solid 2px hsl(300, 90%, 60%)">8</span><span style="border: solid 2px hsl(330, 90%, 60%)">0</span><span style="border: solid 2px hsl(0, 90%, 30%)">7</span><span style="border: solid 2px hsl(30, 90%, 30%)">4</span><span style="border: solid 2px hsl(60, 90%, 30%)">3</span><span style="border: solid 2px hsl(90, 90%, 30%)">13</span><span style="border: solid 2px hsl(120, 90%, 30%)">15</span><span style="border: solid 2px hsl(150, 90%, 30%)">16</span><span style="border: solid 2px hsl(180, 90%, 30%)">9</span><span style="border: solid 2px hsl(210, 90%, 30%)">14</span><span style="border: solid 2px hsl(240, 90%, 30%)">10</span><span style="border: solid 2px hsl(270, 90%, 30%)">12</span><span style="border: solid 2px hsl(300, 90%, 30%)">0</span><span style="border: solid 2px hsl(330, 90%, 30%)">2</span>
 +
 
 +
<code>0020863148418841</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 60%)">00000</span><span style="outline: solid 2px hsl(300, 90%, 60%)">01000</span><span style="outline: solid 2px hsl(270, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(240, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(210, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(180, 90%, 60%)">00101</span><span style="outline: solid 2px hsl(150, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(120, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(90, 90%, 60%)">00011</span><span style="outline: solid 2px hsl(60, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(30, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(0, 90%, 60%)">00001</span></code><br>
 +
<code>01018A7260F68C87</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 30%)">00010</span><span style="outline: solid 2px hsl(300, 90%, 30%)">00000</span><span style="outline: solid 2px hsl(270, 90%, 30%)">01100</span><span style="outline: solid 2px hsl(240, 90%, 30%)">01010</span><span style="outline: solid 2px hsl(210, 90%, 30%)">01110</span><span style="outline: solid 2px hsl(180, 90%, 30%)">01001</span><span style="outline: solid 2px hsl(150, 90%, 30%)">10000</span><span style="outline: solid 2px hsl(120, 90%, 30%)">01111</span><span style="outline: solid 2px hsl(90, 90%, 30%)">01101</span><span style="outline: solid 2px hsl(60, 90%, 30%)">00011</span><span style="outline: solid 2px hsl(30, 90%, 30%)">00100</span><span style="outline: solid 2px hsl(0, 90%, 30%)">00111</span></code>
 +
 
 +
==== Update Light ====
 +
 
 +
Updates light levels for a chunk.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 777: Line 519:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="11"| {{Change|0x22|0x23}}
+
  |rowspan="11"| {{change|0x25|0x23}}
 
  |rowspan="11"| Play
 
  |rowspan="11"| Play
 
  |rowspan="11"| Client
 
  |rowspan="11"| Client
  | Particle ID
+
  |colspan="2"| Chunk X
  | Int
+
  |colspan="2"| VarInt
  | See below
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  | Long Distance
+
  |colspan="2"| Chunk Z
  | Boolean
+
|colspan="2"| VarInt
  | If true, particle distance increases from 256 to 65536
+
  | 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.
 +
|
 
  |-
 
  |-
  | X
+
  |colspan="2"| Sky Light Mask
  | Float
+
  |colspan="2"| VarInt
  | X position of the particle
+
  | 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)
 
  |-
 
  |-
  | Y
+
  |colspan="2"| Block Light Mask
  | Float
+
  |colspan="2"| VarInt
  | Y position of the particle
+
  | Mask containing 18 bits, with the same order as sky light
 
  |-
 
  |-
  | Z
+
  |colspan="2"| Empty Sky Light Mask
  | Float
+
  |colspan="2"| VarInt
  | Z position of the particle
+
  | 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.
 
  |-
 
  |-
  | Offset X
+
  |colspan="2"| Empty Block Light Mask
  | Float
+
  |colspan="2"| VarInt
  | This is added to the X position after being multiplied by random.nextGaussian()
+
  | 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.
 
  |-
 
  |-
  | Offset Y
+
  |rowspan="2"| Sky Light arrays
  | Float
+
| Length
  | This is added to the Y position after being multiplied by random.nextGaussian()
+
|rowspan="2"| Array
 +
  | VarInt
 +
  | Length of the following array in bytes (always 2048)
 
  |-
 
  |-
  | Offset Z
+
  | Sky Light array
  | Float
+
  | Array of 2048 bytes
  | This is added to the Z position after being multiplied by random.nextGaussian()
+
  | 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.
 
  |-
 
  |-
  | Particle Data
+
  |rowspan="2"| Block Light arrays
  | Float
+
| Length
  | The data of each particle
+
|rowspan="2"| Array
 +
  | VarInt
 +
  | Length of the following array in bytes (always 2048)
 
  |-
 
  |-
  | Particle Count
+
  | Block Light array
  | Int
+
  | Array of 2048 bytes
| The number of particles to create
+
  | There is 1 array for each bit set to true in the block light mask, starting with the lowest valueHalf a byte per light value.
|-
 
| Data
 
| {{Change|Array of VarInt|Varies}}
 
  | {{Change|Length depends on particle. "iconcrack" has length of 2, "blockcrack", "blockdust", and "fallingdust" have lengths of 1, the rest have 0.|Type of data varies based off of the particle.  For "iconcrack", it is a [[Slot]]For "blockcrack", "blockdust", and "fallingdust", it is a block state encoded as a VarInt that is an index within the global palette.}}
 
 
  |}
 
  |}
  
==== Craft Recipe Response ====
+
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.
  
Response to the serverbound packet ([[#Craft Recipe Request|Craft Recipe Request]]), with the same recipe ID.  Appears to be used to notify the UI.
+
==== Join Game ====
 +
 
 +
See [[Protocol Encryption]] for information on logging in.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 841: Line 590:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| {{Change|0x2B|0x2C}}
+
  |rowspan="17"| {{change|0x26|0x24}}
  |rowspan="2"| Play
+
  |rowspan="17"| Play
  |rowspan="2"| Client
+
  |rowspan="17"| Client
  | Window ID
+
  | Entity ID
  | Byte
+
  | Int
 +
| The player's Entity ID (EID)
 +
|-
 +
| Is hardcore
 +
| Boolean
 
  |
 
  |
 
  |-
 
  |-
  | Recipe
+
  | Gamemode
  | {{Change|VarInt|Identifer}}
+
  | Unsigned Byte
  | A recipe ID
+
| 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. {{change|Bit 3 (0x8) is the hardcore flag.}}
 +
|- {{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)
 +
|- {{Added}}
 +
| World Count
 +
| VarInt
 +
| Size of the following array
 +
|- {{Added}}
 +
| World Names
 +
| Array of Identifier
 +
| Identifiers for all worlds on the server
 +
|- {{Added}}
 +
  | Dimension Codec
 +
| [[NBT|NBT Tag Compound]]
 +
| The full extent of these is still unknown, but the tag represents a dimension and biome registry. See below for the vanilla default.
 +
|-
 +
| Dimension
 +
| {{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 before this}}
 +
|- {{Added}}
 +
| 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
 +
| {{change|Unsigned Byte|VarInt}}
 +
| 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
 +
|-
 +
| View Distance
 +
| VarInt
 +
| Render distance (2-32)
 +
|-
 +
| Reduced Debug Info
 +
| Boolean
 +
| If true, a Notchian client shows reduced information on the {{Minecraft Wiki|debug screen}}.  For servers in development, this should almost always be false.
 +
|-
 +
| Enable respawn screen
 +
| Boolean
 +
| Set to false when the doImmediateRespawn gamerule is true
 +
|- {{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
 
  |}
 
  |}
  
 +
{{Need Info|Lay out and explain the format}}
 +
 +
'''[https://paste.gg/p/KennyTV/ad46ef552c6443cc808385f060564550 Default Vanilla Dimension/Biome Codec]'''
 +
 +
Known dimension attributes:
 +
 +
{| class="wikitable"
 +
! Name
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Values
 +
|-
 +
| name
 +
| String
 +
|colspan="2"| Dimension's name
 +
| "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
 +
|-
 +
| piglin_safe
 +
| Byte
 +
|colspan="2"| Whether piglins shake and transform to zombified piglins.
 +
| 1: true, 0: false
 +
|-
 +
| natural
 +
| Byte
 +
|colspan="2"| When false, compasses spin randomly. When true, nether portals can spawn zombified piglins.
 +
| 1: true, 0: false
 +
|-
 +
| ambient_light
 +
| Float
 +
|colspan="2"| How much light the dimension has.
 +
| 0.0 to 1.0
 +
|-
 +
| fixed_time
 +
| Long
 +
|colspan="2"| If this is set to a number, the time of the day is the specified value.
 +
| false, or 0 to 24000
 +
|-
 +
| infiniburn
 +
| String
 +
|colspan="2"| A resource location defining what block tag to use for infiniburn.
 +
| "" or minecraft resource "minecraft:..."
 +
|-
 +
| respawn_anchor_works
 +
| Byte
 +
|colspan="2"| Whether players can charge and use respawn anchors.
 +
| 1: true, 0: false
 +
|-
 +
| has_skylight
 +
| Byte
 +
|colspan="2"| Whether the dimension has skylight access or not.
 +
| 1: true, 0: false
 +
|-
 +
| bed_works
 +
| Byte
 +
|colspan="2"| Whether players can use a bed to sleep.
 +
| 1: true, 0: false
 +
|-
 +
| effects
 +
| String
 +
|colspan="2"| ?
 +
| "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
 +
|-
 +
| has_raids
 +
| Byte
 +
|colspan="2"| Whether players with the Bad Omen effect can cause a raid.
 +
| 1: true, 0: false
 +
|-
 +
| logical_height
 +
| Int
 +
|colspan="2"| The maximum height to which chorus fruits and nether portals can bring players within this dimension.
 +
| 0-256
 +
|-
 +
| coordinate_scale
 +
| Float
 +
|colspan="2"| The multiplier applied to coordinates when traveling to the dimension.
 +
| 1: true, 0: false
 +
|-
 +
| ultrawarm
 +
| Byte
 +
|colspan="2"| Whether the dimensions behaves like the nether (water evaporates and sponges dry) or not. Also causes lava to spread thinner.
 +
| 1: true, 0: false
 +
|-
 +
| has_ceiling
 +
| Byte
 +
|colspan="2"| Whether the dimension has a bedrock ceiling or not. When true, causes lava to spread faster.
 +
| 1: true, 0: false
 +
|}
  
 
==== Unlock Recipes ====
 
==== Unlock Recipes ====
Line 864: Line 760:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="8"| {{Change|0x31|0x32}}
+
  |rowspan="14"| {{Change|0x37|0x35}}
  |rowspan="8"| Play
+
  |rowspan="14"| Play
  |rowspan="8"| Client
+
  |rowspan="14"| Client
 
  |-
 
  |-
 
  | Action
 
  | Action
Line 872: Line 768:
 
  | 0: init, 1: add, 2: remove
 
  | 0: init, 1: add, 2: remove
 
  |-
 
  |-
  | Crafting Book Open
+
  | Crafting Recipe Book Open
 
  | Boolean
 
  | Boolean
  | If true, then the crafting book will be open when the player opens its inventory.
+
  | If true, then the crafting recipe book will be open when the player opens its inventory.
 
  |-
 
  |-
  | Filtering Craftable
+
  | 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.
 +
|- {{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
 
  | Boolean
 
  | If true, then the filtering option is active when the players opens its inventory.
 
  | If true, then the filtering option is active when the players opens its inventory.
Line 885: Line 805:
 
  |-
 
  |-
 
  | Recipe IDs
 
  | Recipe IDs
  | Array of {{Change|VarInt|Identifier}}
+
  | Array of Identifier
 
  |
 
  |
 
  |-
 
  |-
Line 893: Line 813:
 
  |-
 
  |-
 
  | Recipe IDs
 
  | Recipe IDs
  | Optional Array of {{Change|VarInt|Identifier}}, only present if mode is 0 (init)
+
  | Optional Array of Identifier, only present if mode is 0 (init)
 
  |
 
  |
 
  |}
 
  |}
 
Action:
 
Action:
* 0 (init) = All the recipes in the list 2 will added to the recipe book. All the recipes in list 1 will be tagged as displayed, recipes that aren't tagged will be shown in the notification. VERIFY LIST ORDER?
+
* 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.
 
* 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.
 
* 2 (remove) = Remove all the recipes in the list. This allows them to re-displayed when they are readded.
  
==== Scoreboard Objective ====
+
==== Respawn ====
  
This is sent to the client when it should create a new {{Minecraft Wiki|scoreboard}} objective or remove one.
+
To change the player's dimension (overworld/nether/end), send them a respawn packet with the appropriate dimension, followed by prechunks/chunks for the new dimension, and finally a position and look packet. You do not need to unload chunks, the client will do it automatically.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 913: Line 833:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| {{Change|0x42|0x43}}
+
|rowspan="10"| {{Change|0x3B|0x39}}
 +
|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
 +
|-
 +
| Hashed seed
 +
| Long
 +
| First 8 bytes of the SHA-256 hash of the world's seed.
 +
|- {{Added}}
 +
| Gamemode
 +
| Unsigned Byte
 +
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included
 +
|- {{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.
 +
|}
 +
 
 +
{{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.}}
 +
 
 +
==== Multi Block Change ====
 +
 
 +
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
  |rowspan="4"| {{Change|0x10|0x3B}}
 
  |rowspan="4"| Play
 
  |rowspan="4"| Play
 
  |rowspan="4"| Client
 
  |rowspan="4"| Client
  | Objective Name
+
  |
  | String (16)
+
  | Long
  | An unique name for the objective
+
| Chunk section coordinate (encoded chunk x and z with each 22 bits, and section y with 20 bits, from left to right)
 +
  |- {{added}}
 +
|
 +
| Boolean
 +
| Always inverse the preceding Update Light packet's "Trust Edges" bool
 +
|
 
  |-
 
  |-
  | Mode
+
  | Array size
  | Byte
+
  | VarInt
  | 0 to create the scoreboard. 1 to remove the scoreboard. 2 to update the display text.
+
  | Number of elements in the following array
 
  |-
 
  |-
  | Objective Value
+
  |  
  | Optional String (32)
+
  | Array of VarLong
  | Only if mode is 0 or 2. The text to be displayed for the score
+
  | 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).
|-
 
| Type
 
| Optional {{change|String|VarInt Enum}}
 
| Only if mode is 0 or 2. {{change|“integer” or “hearts”|0 = "integer", 1 = "hearts"}}
 
 
  |}
 
  |}
  
==== Stop Sound ====
+
==== Entity Properties ====
 +
 
 +
Sets {{Minecraft Wiki|Attribute|attributes}} on the given entity.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 939: Line 918:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="7"| 0x4A
+
  |rowspan="6"| {{change|0x59|0x58}}
  |rowspan="7"| Play
+
  |rowspan="6"| Play
  |rowspan="7"| Client
+
  |rowspan="6"| Client
  | Flags
+
  |colspan="2"| Entity ID
  | Byte
+
|colspan="2"| VarInt
  | Controls which fields are present.
+
|
 +
|-
 +
|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
 
  |-
 
  |-
  | Source
+
  | Number Of Modifiers
  | Optional VarInt enum
+
  | VarInt
  | Only if flags is 3 or 1 (bit mask 0x1).  See below.  If not present, then sounds from all sources are cleared.
+
  | Number of elements in the following array
 
  |-
 
  |-
  | Sound
+
  | Modifiers
  | Optional Identifier
+
  | Array of Modifier Data
  | Only if flags is 2 or 3 (bit mask 0x2).  A sound effect name, see [[#Named Sound Effect|Named Sound Effect]]. If not present, then all sounds are cleared.
+
  | See {{Minecraft Wiki|Attribute#Modifiers}}. Modifier Data defined below.
 
  |}
 
  |}
  
Categories:
+
Known Key values (see also {{Minecraft Wiki|Attribute#Modifiers}}):
  
 
{| class="wikitable"
 
{| class="wikitable"
! Name !! Value
 
 
  |-
 
  |-
  | master || 0
+
! Key
 +
! Default
 +
! 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
 
  |-
 
  |-
  | music || 1
+
  | {{change|generic.movementSpeed|generic.movement_speed}}
 +
| 0.7
 +
| 0.0
 +
| 1024.0
 +
| Movement Speed
 
  |-
 
  |-
  | record || 2
+
  | {{change|generic.attackDamage|generic.attack_damage}}
 +
| 2.0
 +
| 0.0
 +
| 2048.0
 +
| Attack Damage
 
  |-
 
  |-
  | weather || 3
+
  | {{change|generic.attackSpeed|generic.attack_speed}}
 +
| 4.0
 +
| 0.0
 +
| 1024.0
 +
| Attack Speed
 
  |-
 
  |-
  | block || 4
+
  | {{change|generic.flyingSpeed|generic.flying_speed}}
 +
| 0.4
 +
| 0.0
 +
| 1024.0
 +
| Flying Speed
 
  |-
 
  |-
  | hostile || 5
+
  | generic.armor
 +
| 0.0
 +
| 0.0
 +
| 30.0
 +
| Armor
 
  |-
 
  |-
  | neutral || 6
+
  | {{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
 +
|-
 +
| {{change|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 ([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"
 +
|-
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | player || 7
+
  | UUID
 +
| UUID
 +
|  
 
  |-
 
  |-
  | ambient || 8
+
  | Amount
 +
| Double
 +
| May be positive or negative
 
  |-
 
  |-
  | voice || 9
+
  | 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 ====
 
==== Declare Recipes ====
Line 995: Line 1,094:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x52
+
  |rowspan="4"| {{change|0x5B|0x5A}}
 
  |rowspan="4"| Play
 
  |rowspan="4"| Play
 
  |rowspan="4"| Client
 
  |rowspan="4"| Client
 
  |colspan="2"| Num Recipes
 
  |colspan="2"| Num Recipes
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
  | Length of the following array
+
  | Number of elements in the following array
 
  |-
 
  |-
 
  |rowspan="3"| Recipe
 
  |rowspan="3"| Recipe
Line 1,038: Line 1,137:
 
     | Ingredient count
 
     | Ingredient count
 
     | VarInt
 
     | VarInt
     | Length of the following array
+
     | Number of elements in the following array
 
     |-
 
     |-
 
     | Ingredients
 
     | Ingredients
Line 1,080: Line 1,179:
 
  | <code>crafting_special_armordye</code>
 
  | <code>crafting_special_armordye</code>
 
  | Recipe for dying leather armor
 
  | Recipe for dying leather armor
  | None
+
  |rowspan="13"| None
 
  |-
 
  |-
 
  | <code>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>crafting_special_mapcloning</code>
 
  | <code>crafting_special_mapcloning</code>
 
  | Recipe for copying maps
 
  | Recipe for copying maps
| None
 
 
  |-
 
  |-
 
  | <code>crafting_special_mapextending</code>
 
  | <code>crafting_special_mapextending</code>
 
  | Recipe for adding paper to maps
 
  | Recipe for adding paper to maps
| None
 
 
  |-
 
  |-
 
  | <code>crafting_special_firework_rocket</code>
 
  | <code>crafting_special_firework_rocket</code>
 
  | Recipe for making firework rockets
 
  | Recipe for making firework rockets
| None
 
 
  |-
 
  |-
 
  | <code>crafting_special_firework_star</code>
 
  | <code>crafting_special_firework_star</code>
 
  | Recipe for making firework stars
 
  | Recipe for making firework stars
| None
 
 
  |-
 
  |-
 
  | <code>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>crafting_special_repairitem</code>
 
  | <code>crafting_special_repairitem</code>
 
  | Recipe for repairing items via crafting
 
  | Recipe for repairing items via crafting
| None
 
 
  |-
 
  |-
 
  | <code>crafting_special_tippedarrow</code>
 
  | <code>crafting_special_tippedarrow</code>
 
  | Recipe for crafting tipped arrows
 
  | Recipe for crafting tipped arrows
| None
 
 
  |-
 
  |-
 
  | <code>crafting_special_bannerduplicate</code>
 
  | <code>crafting_special_bannerduplicate</code>
 
  | Recipe for copying banner patterns
 
  | Recipe for copying banner patterns
| None
 
 
  |-
 
  |-
 
  | <code>crafting_special_banneraddpattern</code>
 
  | <code>crafting_special_banneraddpattern</code>
 
  | Recipe for adding patterns to banners
 
  | Recipe for adding patterns to banners
| None
 
 
  |-
 
  |-
 
  | <code>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>crafting_special_shulkerboxcoloring</code>
 
  | <code>crafting_special_shulkerboxcoloring</code>
 
  | Recipe for recoloring a shulker box
 
  | Recipe for recoloring a shulker box
  | None
+
  |-
 +
| <code>smelting</code>
 +
| Smelting recipe
 +
|rowspan="4"| As follows:
 +
  {| class="wikitable"
 +
    ! Name
 +
    ! Type
 +
    ! Description
 +
    |-
 +
    | Group
 +
    | String
 +
    | Used to group similar recipes together in the recipe book.
 +
    |-
 +
    | Ingredient
 +
    | Ingredient
 +
    |
 +
    |-
 +
    | Result
 +
    | [[Slot]]
 +
    |
 +
    |-
 +
    | Experience
 +
    | Float
 +
    |
 +
    |-
 +
    | Cooking time
 +
    | 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}}
 +
| <code>smithing</code>
 +
| Smithing table recipe
 +
| As follows:
 +
  {| class="wikitable"
 +
    ! Name
 +
    ! Type
 +
    ! Description
 +
    |-
 +
    | Base
 +
    | Ingredient
 +
    | First item
 +
    |-
 +
    | Addition
 +
    | Ingredient
 +
    | Second item
 +
    |-
 +
    | Result
 +
    | [[Slot]]
 +
    |
 +
    |}
 
  |}
 
  |}
  
Line 1,140: Line 1,307:
 
  | Count
 
  | Count
 
  | VarInt
 
  | VarInt
  | Length of the following array
+
  | Number of elements in the following array
 
  |-
 
  |-
 
  | Items
 
  | Items
Line 1,147: Line 1,314:
 
  |}
 
  |}
  
==== Tags ====
+
=== Serverbound ===
 +
 
 +
==== Interact Entity ====
  
{{Warning|This packet MUST be send, even if it's empty, not doing so can crash the client (e.g. when clicking a fuel slot in a furnace).}}
+
This packet is sent from the client to the server when the client attacks or right-clicks another entity (a player, minecart, etc).
 +
 
 +
A Notchian server only accepts this packet if the entity being attacked/used is visible without obstruction and within a 4-unit radius of the player's position.
 +
 
 +
Note that middle-click in creative mode is interpreted by the client and sent as a [[#Creative Inventory Action|Creative Inventory Action]] packet instead.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,159: Line 1,332:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x53
+
  |rowspan="7"| 0x0E
  |rowspan="2"| Play
+
  |rowspan="7"| Play
  |rowspan="2"| Client
+
  |rowspan="7"| Server
  | Block Tags
+
| Entity ID
  | (See below)
+
| VarInt
  | IDs are block IDs
+
| 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
 
  |-
 
  |-
  | Item Tags
+
  | Hand
  | (See below)
+
  | Optional VarInt Enum
  | IDs are item IDs
+
  | Only if Type is interact or interact at; 0: main hand, 1: off hand
 +
|- {{Added}}
 +
| Sneaking
 +
| Boolean
 +
| If the client is sneaking.
 
  |}
 
  |}
  
Tags look like:
+
==== Generate Structure ====
  
{| class="wikitable"
+
Sent when Generate is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
  !colspan="2"| Field Name
+
 
  !colspan="2"| Field Type
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
  ! Field Name
 +
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |colspan="2"| Length
+
  |rowspan="3"| 0x0F
  |colspan="2"| VarInt
+
  |rowspan="3"| Play
  | Length of the following array
+
  |rowspan="3"| Server
 +
| Location
 +
| Position
 +
| Block entity location
 
  |-
 
  |-
  |rowspan="3"| Tags
+
  | Levels
| Tag name
 
|rowspan="3"| Array
 
| Identifier
 
|
 
|-
 
| Count
 
 
  | VarInt
 
  | VarInt
  | Length of the following array
+
  | Value of the levels slider/max depth to generate
 
  |-
 
  |-
  | Entries
+
  | Keep Jigsaws
  | Array of VarInt
+
  | Boolean
  | Numeric ID of the block/item.
+
  |
 
  |}
 
  |}
  
=== Serverbound ===
+
==== Player Abilities (serverbound) ====
  
==== Tab-Complete (serverbound) ====
+
{{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.}}
  
{{Need Info|This is most definitely no longer an accurate description of this packet}}
+
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.}}
 
 
Sent when the user presses ''tab'' while writing text.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,213: Line 1,406:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| {{Change|0x01|0x04}}
+
  |rowspan="3"| {{change|0x19|0x1A}}
  |rowspan="5"| Play
+
  |rowspan="3"| Play
  |rowspan="5"| Server
+
  |rowspan="3"| Server
  |style="background-color: #d9ead3;"| Transaction Id
+
  | Flags
  |style="background-color: #d9ead3;"| VarInt
+
  | Byte
  |style="background-color: #d9ead3;"| The id received in the tab completion request packet, must match or the client will ignore this packet.
+
  | Bit mask. {{change|0x08: damage disabled (god mode), 0x04: can fly, }}0x02: is flying{{change|, 0x01: is Creative}}
|-
+
  |- {{removed}}
| Text
+
  | Flying Speed
| String ({{change|32767|256}})
+
  | Float
  | All text behind the cursor without the <code>/</code> (e.g. to the left of the cursor in left-to-right languages like English)
+
  |  
|- style="background-color: #f4cccc; text-decoration: line-through;"
+
  |- {{removed}}
  | Assume Command
+
  | Walking Speed
  | Boolean
+
  | Float
  | If true, the server will parse Text as a command even if it doesn't start with a <code>/</code>. Used in the command block GUI.
 
  |- style="background-color: #f4cccc; text-decoration: line-through;"
 
  | Has Position
 
  | Boolean
 
 
  |  
 
  |  
|- style="background-color: #f4cccc; text-decoration: line-through;"
 
| Looked At Block
 
| Optional Position
 
| The position of the block being looked at. Only sent if Has Position is true.
 
 
  |}
 
  |}
  
==== Craft Recipe Request ====
+
==== Set Displayed Recipe ====
  
A replacement for [[Protocol#Prepare Crafting Grid|Prepare Crafting Grid]].  It appears to behave more or less the same, but the client does not specify where to move the items.
+
Replaces Recipe Book Data, type 0.
  
This packet is sent when a player clicks a recipe in the crafting book that is craftable (white border).
+
{| class="wikitable" {{Added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="1"| 0x1E
 +
|rowspan="1"| Play
 +
|rowspan="1"| Server
 +
| Recipe ID
 +
| Identifier
 +
|
 +
|}
  
{| class="wikitable"
+
==== Set Recipe Book State ====
 +
 
 +
Replaces Recipe Book Data, type 1.
 +
 
 +
{| class="wikitable" {{Added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 1,251: Line 1,454:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x12
+
  |rowspan="3"| 0x1F
 
  |rowspan="3"| Play
 
  |rowspan="3"| Play
 
  |rowspan="3"| Server
 
  |rowspan="3"| Server
  | Window ID
+
  | Book ID
  | Byte
+
  | 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 {{Minecraft Wiki|Jigsaw Block}} interface.
 +
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | Recipe
+
  |rowspan="7"| {{Change|0x27|0x28}}
  | {{Change|VarInt|Identifier}}
+
|rowspan="7"| Play
  | A recipe ID
+
|rowspan="7"| Server
 +
| Location
 +
| Position
 +
| Block entity location
 +
|- {{Removed}}
 +
| Attachment type
 +
| Identifier
 +
|
 +
|- {{Added}}
 +
| Name
 +
| Identifier
 +
|
 +
|- {{Added}}
 +
| Target
 +
| Identifier
 +
|
 +
|-
 +
  | {{Change|Target pool|Pool}}
 +
  | Identifier
 +
|
 
  |-
 
  |-
  | Make all
+
  | Final state
  | Boolean
+
  | String
  | Affects the amount of items processed; true if shift is down when clicked
+
  | "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
 +
|-
 +
|rowspan="5"| 0x47
 +
|rowspan="5"| Play
 +
|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]]
 +
|
 +
|-
 +
|rowspan="2"| Equipment
 +
| Slot
 +
|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.
 +
|-
 +
| Item
 +
| [[Slot Data|Slot]]
 +
|
 +
|}
  
 
== Handshaking ==
 
== Handshaking ==
Line 1,293: Line 1,575:
 
  | Protocol Version
 
  | Protocol Version
 
  | VarInt
 
  | VarInt
  | See [[protocol version numbers]] (currently {{change|340|351}})
+
  | See [[protocol version numbers]] (currently {{change|578|753}})
 
  |-
 
  |-
 
  | 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 1,322: Line 1,604:
 
=== 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 17:11, 10 September 2020

This page documents the changes from the last stable Minecraft release (currently 1.15.2, protocol 578) to the current pre-release (currently 1.16.3, protocol 753). 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.

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

0020863148418841 0000000000100000100001100011000101001000010000011000100001000001
01018A7260F68C87 0000000100000001100010100111001001100000111101101000110010000111

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 VarInt 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:
Lay out and explain the format

Default Vanilla Dimension/Biome Codec

Known dimension attributes:

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

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 Always inverse the preceding Update Light packet's "Trust Edges" bool
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 578 753)
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.