Difference between revisions of "Pre-release protocol"

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This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.11.2, protocol 316]]) to the current pre-release (currently [[Protocol version numbers|1.12-pre4, protocol 331]]). 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|20w27a, protocol 738]]). 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 ===
  
No changes so far.
+
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 ===
 
=== Packets ===
Line 18: Line 18:
 
  !colspan="2"| Documentation
 
  !colspan="2"| Documentation
 
  |-
 
  |-
!colspan="4"| Handshaking serverbound
+
!colspan="4"| Handshaking serverbound
{{PacketList|0x00|Handshake}}
+
{{PacketList|0x00|Handshake}}
 
  |-
 
  |-
!colspan="4"| Play clientbound
+
!colspan="4"| Play clientbound
{{PacketList|0x08|Advancements|rel=added}}
+
{{PacketList|0x02|Spawn Weather Entity|pre=removed}}
{{PacketList|{{Change|0x08|0x09}}|Block Break Animation|pre=unchanged}}
+
{{PacketList|{{change|0x03|0x02}}|Spawn Living Entity|pre=unchanged}}
{{PacketList|{{Change|0x09|0x0A}}|Update Block Entity}}
+
{{PacketList|{{change|0x04|0x03}}|Spawn Painting|pre=unchanged}}
{{PacketList|{{Change|0x0A|0x0B}}|Block Action|pre=unchanged}}
+
{{PacketList|{{change|0x05|0x04}}|Spawn Player|pre=unchanged}}
{{PacketList|{{Change|0x0B|0x0C}}|Block Change|pre=unchanged}}
+
{{PacketList|{{change|0x06|0x05}}|Entity Animation (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x0C|0x0D}}|Boss Bar|pre=unchanged}}
+
{{PacketList|{{change|0x07|0x06}}|Statistics|pre=unchanged}}
{{PacketList|{{Change|0x0D|0x0E}}|Server Difficulty|pre=unchanged}}
+
{{PacketList|{{change|0x08|0x07}}|Acknowledge Player Digging|pre=unchanged}}
{{PacketList|{{Change|0x0E|0x0F}}|Tab-Complete (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x09|0x08}}|Block Break Animation|pre=unchanged}}
{{PacketList|{{Change|0x0F|0x10}}|Chat Message (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x0A|0x09}}|Block Entity Data|pre=unchanged}}
{{PacketList|{{Change|0x10|0x11}}|Multi Block Change|pre=unchanged}}
+
{{PacketList|{{change|0x0B|0x0A}}|Block Action|pre=unchanged}}
{{PacketList|{{Change|0x11|0x12}}|Confirm Transation (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x0C|0x0B}}|Block Change|pre=unchanged}}
{{PacketList|{{Change|0x12|0x13}}|Close Window (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x0D|0x0C}}|Boss Bar|pre=unchanged}}
{{PacketList|{{Change|0x13|0x14}}|Open Window|pre=unchanged}}
+
{{PacketList|{{change|0x0E|0x0D}}|Server Difficulty|pre=unchanged}}
{{PacketList|{{Change|0x14|0x15}}|Window Items|pre=unchanged}}
+
{{PacketList|{{change|0x0F|0x0E}}|Chat Message (clientbound)}}
{{PacketList|{{Change|0x15|0x16}}|Window Property|pre=unchanged}}
+
{{PacketList|{{change|0x11|0x09}}|Tab-Complete (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x16|0x17}}|Set Slot|pre=unchanged}}
+
{{PacketList|{{change|0x12|0x10}}|Declare Commands|pre=unchanged}}
{{PacketList|{{Change|0x17|0x18}}|Set Cooldown|pre=unchanged}}
+
{{PacketList|{{change|0x13|0x11}}|Window Confirmation (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x18|0x19}}|Plugin Message (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x14|0x12}}|Close Window (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x19|0x1A}}|Named Sound Effect|pre=unchanged}}
+
{{PacketList|{{change|0x15|0x13}}|Window Items|pre=unchanged}}
{{PacketList|{{Change|0x1A|0x1B}}|Disconnect (play)|pre=unchanged}}
+
{{PacketList|{{change|0x16|0x14}}|Window Property|pre=unchanged}}
{{PacketList|{{Change|0x1B|0x1C}}|Entity Status|pre=unchanged}}
+
{{PacketList|{{change|0x17|0x15}}|Set Slot|pre=unchanged}}
{{PacketList|{{Change|0x1C|0x1D}}|Explosion|pre=unchanged}}
+
{{PacketList|{{change|0x18|0x16}}|Set Cooldown|pre=unchanged}}
{{PacketList|{{Change|0x1D|0x1E}}|Unload Chunk|pre=unchanged}}
+
{{PacketList|{{change|0x19|0x17}}|Plugin Message (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x1E|0x1F}}|Change Game State|pre=unchanged}}
+
{{PacketList|{{change|0x1A|0x18}}|Named Sound Effect|pre=unchanged}}
{{PacketList|{{Change|0x1F|0x20}}|Keep Alive (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x1B|0x19}}|Disconnect (play)|pre=unchanged}}
{{PacketList|{{Change|0x20|0x21}}|Chunk Data|pre=unchanged}}
+
{{PacketList|{{change|0x1C|0x1A}}|Entity Status|pre=unchanged}}
{{PacketList|{{Change|0x21|0x22}}|Effect|pre=unchanged}}
+
{{PacketList|{{change|0x1D|0x1B}}|Explosion|pre=unchanged}}
{{PacketList|{{Change|0x22|0x23}}|Particle|pre=unchanged}}
+
{{PacketList|{{change|0x1E|0x1C}}|Unload Chunk|pre=unchanged}}
{{PacketList|{{Change|0x23|0x24}}|Join Game|pre=unchanged}}
+
{{PacketList|{{change|0x1F|0x1D}}|Change Game State|pre=unchanged}}
{{PacketList|{{Change|0x24|0x25}}|Particle|pre=unchanged}}
+
{{PacketList|{{change|0x20|0x1E}}|Open Horse Window|pre=unchanged}}
{{PacketList|{{Change|0x25|0x26}}|Entity Relative Move|pre=unchanged}}
+
{{PacketList|{{change|0x21|0x1F}}|Keep Alive (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x26|0x27}}|Entity Look And Relative Move|pre=unchanged}}
+
{{PacketList|{{change|0x22|0x20}}|Chunk Data}}
{{PacketList|{{Change|0x27|0x28}}|Entity Look|pre=unchanged}}
+
{{PacketList|{{change|0x23|0x21}}|Effect|pre=unchanged}}
{{PacketList|{{Change|0x28|0x29}}|Entity|pre=unchanged}}
+
{{PacketList|{{change|0x24|0x22}}|Particle|pre=unchanged}}
{{PacketList|{{Change|0x29|0x2A}}|Vehicle Move (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x25|0x23}}|Update Light}}
{{PacketList|{{Change|0x2A|0x2B}}|Open Sign Editor|pre=unchanged}}
+
{{PacketList|{{change|0x26|0x24}}|Join Game}}
{{PacketList|{{Change|0x2B|0x2C}}|Player Abilities (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x27|0x25}}|Map Data|pre=unchanged}}
{{PacketList|{{Change|0x2C|0x2D}}|Combat Event|pre=unchanged}}
+
{{PacketList|{{change|0x28|0x26}}|Trade List|pre=unchanged}}
{{PacketList|{{Change|0x2D|0x2E}}|Player List Item|pre=unchanged}}
+
{{PacketList|{{change|0x29|0x27}}|Entity Position|pre=unchanged}}
{{PacketList|{{Change|0x2E|0x2F}}|Player Position And Look (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x2A|0x28}}|Entity Position and Rotation|pre=unchanged}}
{{PacketList|{{Change|0x2F|0x30}}|Use Bed|pre=unchanged}}
+
{{PacketList|{{change|0x2B|0x29}}|Entity Rotation|pre=unchanged}}
{{PacketList|0x31|Unlock Recipes|rel=added}}
+
{{PacketList|{{change|0x2C|0x2A}}|Entity Movement|pre=unchanged}}
{{PacketList|{{Change|0x30|0x32}}|Destroy Entities|pre=unchanged}}
+
{{PacketList|{{change|0x2D|0x2B}}|Vehicle Move (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x31|0x33}}|Remove Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x2E|0x2C}}|Open Book|pre=unchanged}}
{{PacketList|{{Change|0x32|0x34}}|Resource Pack Send|pre=unchanged}}
+
{{PacketList|{{change|0x2F|0x2D}}|Open Window|pre=unchanged}}
{{PacketList|{{Change|0x33|0x35}}|Respawn|pre=unchanged}}
+
{{PacketList|{{change|0x30|0x2E}}|Open Sign Editor|pre=unchanged}}
{{PacketList|{{Change|0x34|0x36}}|Entity Head Look|pre=unchanged}}
+
{{PacketList|{{change|0x31|0x2F}}|Craft Recipe Response|pre=unchanged}}
{{PacketList|{{Change|0x35|0x37}}|World Border|pre=unchanged}}
+
{{PacketList|{{change|0x32|0x30}}|Player Abilities (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x36|0x38}}|Camera|pre=unchanged}}
+
{{PacketList|{{change|0x33|0x31}}|Combat Event|pre=unchanged}}
{{PacketList|{{Change|0x37|0x39}}|Held Item Change (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x34|0x32}}|Player Info|pre=unchanged}}
{{PacketList|{{Change|0x38|0x3A}}|Display Scoreboard|pre=unchanged}}
+
{{PacketList|{{change|0x35|0x33}}|Face Player|pre=unchanged}}
{{PacketList|{{Change|0x39|0x3B}}|Entity Metadata|pre=unchanged}}
+
{{PacketList|{{change|0x36|0x34}}|Player Position And Look (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x3A|0x3C}}|Attach Entity|pre=unchanged}}
+
{{PacketList|{{change|0x37|0x35}}|Unlock Recipes}}
{{PacketList|{{Change|0x3B|0x3D}}|Entity Velocity|pre=unchanged}}
+
{{PacketList|{{change|0x38|0x36}}|Destroy Entities|pre=unchanged}}
{{PacketList|{{Change|0x3C|0x3E}}|Entity Equipment|pre=unchanged}}
+
{{PacketList|{{change|0x39|0x37}}|Remove Entity Effect|pre=unchanged}}
{{PacketList|{{Change|0x3D|0x3F}}|Set Experience|pre=unchanged}}
+
{{PacketList|{{change|0x3A|0x38}}|Resource Pack Send|pre=unchanged}}
{{PacketList|{{Change|0x3E|0x40}}|Update Health|pre=unchanged}}
+
{{PacketList|{{change|0x3B|0x39}}|Respawn}}
{{PacketList|{{Change|0x3F|0x41}}|Scoreboard Objective|pre=unchanged}}
+
{{PacketList|{{change|0x3C|0x3A}}|Entity Head Look|pre=unchanged}}
{{PacketList|{{Change|0x40|0x42}}|Set Passengers|pre=unchanged}}
+
{{PacketList|{{change|0x10|0x3B}}|Multi Block Change}}
{{PacketList|{{Change|0x41|0x43}}|Teams|pre=unchanged}}
+
{{PacketList|{{change|0x3D|0x3C}}|Select Advancement Tab|pre=unchanged}}
{{PacketList|{{Change|0x42|0x44}}|Update Score|pre=unchanged}}
+
{{PacketList|{{change|0x3E|0x3D}}|World Border|pre=unchanged}}
{{PacketList|{{Change|0x43|0x45}}|Spawn Position|pre=unchanged}}
+
{{PacketList|{{change|0x3F|0x3E}}|Camera|pre=unchanged}}
{{PacketList|{{Change|0x44|0x46}}|Time Update|pre=unchanged}}
+
{{PacketList|{{change|0x40|0x3F}}|Held Item Change (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x45|0x47}}|Title|pre=unchanged}}
+
{{PacketList|{{change|0x41|0x40}}|Update View Position|pre=unchanged}}
{{PacketList|{{Change|0x46|0x48}}|Sound Effect|pre=unchanged}}
+
{{PacketList|{{change|0x42|0x41}}|Update View Distance|pre=unchanged}}
{{PacketList|{{Change|0x47|0x49}}|Player List Header And Footer|pre=unchanged}}
+
{{PacketList|0x47|Entity Equipment}}
{{PacketList|{{Change|0x48|0x4A}}|Collect Item|pre=unchanged}}
+
{{PacketList|{{change|0x4E|0x42}}|Spawn Position|pre=unchanged}}
{{PacketList|{{Change|0x49|0x4B}}|Entity Teleport|pre=unchanged}}
+
{{PacketList|{{change|0x4F|0x4E}}|Time Update|pre=unchanged}}
{{PacketList|{{Change|0x4A|0x4C}}|Entity Properties|pre=unchanged}}
+
{{PacketList|{{change|0x50|0x4F}}|Title|pre=unchanged}}
{{PacketList|{{Change|0x4B|0x4D}}|Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x51|0x50}}|Entity Sound Effect|pre=unchanged}}
{{PacketList|0x4E|Advancement Progress|rel=added}}
+
{{PacketList|{{change|0x52|0x51}}|Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x53|0x52}}|Stop Sound|pre=unchanged}}
 +
{{PacketList|{{change|0x54|0x53}}|Player List Header And Footer|pre=unchanged}}
 +
{{PacketList|{{change|0x55|0x54}}|NBT Query Response|pre=unchanged}}
 +
{{PacketList|{{change|0x56|0x55}}|Collect Item|pre=unchanged}}
 +
{{PacketList|{{change|0x57|0x56}}|Entity Teleport|pre=unchanged}}
 +
{{PacketList|{{change|0x58|0x57}}|Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x59|0x58}}|Entity Properties}}
 +
{{PacketList|{{change|0x5A|0x59}}|Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x5B|0x5A}}|Declare Recipes}}
 +
{{PacketList|{{change|0x5C|0x5B}}|Tags|pre=unchanged}}
 
  |-
 
  |-
!colspan="4"| Play serverbound
+
!colspan="4"| Play serverbound
{{PacketList|0x01|Prepare Crafting Grid|rel=added}}
+
{{PacketList|0x0E|Interact Entity}}
{{PacketList|{{Change|0x01|0x02}}|Tab-Complete (serverbound)|pre=unchanged}}
+
{{PacketList|0x0F|Generate Structure|rel=added}}
{{PacketList|{{Change|0x02|0x03}}|Chat Message (serverbound)|pre=unchanged}}
+
{{PacketList|{{change|0x0F|0x10}}|Keep Alive (serverbound)|pre=unchanged}}
{{PacketList|{{Change|0x03|0x04}}|Client Status|pre=unchanged}}
+
{{PacketList|{{change|0x10|0x11}}|Lock Difficulty|pre=unchanged}}
{{PacketList|{{Change|0x04|0x05}}|Client Settings|pre=unchanged}}
+
{{PacketList|{{change|0x11|0x12}}|Player Position|pre=unchanged}}
{{PacketList|{{Change|0x05|0x06}}|Confirm Transaction (serverbound)|pre=unchanged}}
+
{{PacketList|{{change|0x12|0x13}}|Player Position And Rotation (serverbound)|pre=unchanged}}
{{PacketList|{{Change|0x06|0x07}}|Enchant Item|pre=unchanged}}
+
{{PacketList|{{change|0x13|0x14}}|Player Rotation|pre=unchanged}}
{{PacketList|{{Change|0x07|0x08}}|Click Window|pre=unchanged}}
+
{{PacketList|{{change|0x14|0x15}}|Player Movement|pre=unchanged}}
{{PacketList|{{Change|0x08|0x09}}|Close Window (serverbound)|pre=unchanged}}
+
{{PacketList|{{change|0x15|0x16}}|Vehicle Move (serverbound)|pre=unchanged}}
{{PacketList|{{Change|0x09|0x0A}}|Plugin Message (serverbound)|pre=unchanged}}
+
{{PacketList|{{change|0x16|0x17}}|Steer Boat|pre=unchanged}}
{{PacketList|{{Change|0x0A|0x0B}}|Use Entity|pre=unchanged}}
+
{{PacketList|{{change|0x17|0x18}}|Pick Item|pre=unchanged}}
{{PacketList|{{Change|0x0B|0x0C}}|Keep Alive (serverbound)|pre=unchanged}}
+
{{PacketList|{{change|0x18|0x19}}|Craft Recipe Request|pre=unchanged}}
{{PacketList|{{Change|0x0C|0x0D}}|Player Position|pre=unchanged}}
+
{{PacketList|{{change|0x19|0x1A}}|Player Abilities (serverbound)}}
{{PacketList|{{Change|0x0D|0x0E}}|Player Position And Look (serverbound)|pre=unchanged}}
+
{{PacketList|{{change|0x1A|0x1B}}|Player Digging|pre=unchanged}}
{{PacketList|{{Change|0x0E|0x0F}}|Player Look|pre=unchanged}}
+
{{PacketList|{{change|0x1B|0x1C}}|Entity Action|pre=unchanged}}
{{PacketList|{{Change|0x0F|0x10}}|Player|pre=unchanged}}
+
{{PacketList|{{change|0x1C|0x1D}}|Steer Vehicle|pre=unchanged}}
{{PacketList|{{Change|0x10|0x11}}|Vehicle Move (serverbound)|pre=unchanged}}
+
{{PacketList|0x1D|Recipe Book Data|pre=removed}}
{{PacketList|{{Change|0x11|0x12}}|Steer Boat|pre=unchanged}}
+
{{PacketList|0x1E|Set Displayed Recipe|rel=added}}
{{PacketList|{{Change|0x12|0x13}}|Player Abilities (serverbound)|pre=unchanged}}
+
{{PacketList|0x1F|Set Recipe Book State|rel=added}}
{{PacketList|{{Change|0x13|0x14}}|Player Digging|pre=unchanged}}
+
{{PacketList|{{change|0x1E|0x20}}|Name Item|pre=unchanged}}
{{PacketList|{{Change|0x14|0x15}}|Entity Action|pre=unchanged}}
+
{{PacketList|{{change|0x1F|0x21}}|Resource Pack Status|pre=unchanged}}
{{PacketList|{{Change|0x15|0x16}}|Steer Vehicle|pre=unchanged}}
+
{{PacketList|{{change|0x20|0x22}}|Advancement Tab|pre=unchanged}}
{{PacketList|0x17|Crafting Book Data|rel=added}}
+
{{PacketList|{{change|0x21|0x23}}|Select Trade|pre=unchanged}}
{{PacketList|{{Change|0x16|0x18}}|Resource Pack Status|pre=unchanged}}
+
{{PacketList|{{change|0x22|0x24}}|Set Beacon Effect|pre=unchanged}}
{{PacketList|{{Change|0x17|0x19}}|Held Item Change (serverbound)|pre=unchanged}}
+
{{PacketList|{{change|0x23|0x25}}|Held Item Change (serverbound)|pre=unchanged}}
{{PacketList|{{Change|0x18|0x1A}}|Creative Inventory Action|pre=unchanged}}
+
{{PacketList|{{change|0x24|0x26}}|Update Command Block|pre=unchanged}}
{{PacketList|{{Change|0x19|0x1B}}|Update Sign|pre=unchanged}}
+
{{PacketList|{{change|0x25|0x27}}|Update Command Block Minecart|pre=unchanged}}
{{PacketList|{{Change|0x1A|0x1C}}|Animation (serverbound)|pre=unchanged}}
+
{{PacketList|{{change|0x26|0x28}}|Creative Inventory Action|pre=unchanged}}
{{PacketList|{{Change|0x1B|0x1D}}|Spectate|pre=unchanged}}
+
{{PacketList|{{change|0x27|0x29}}|Update Jigsaw Block}}
{{PacketList|{{Change|0x1C|0x1E}}|Player Block Placement|pre=unchanged}}
+
{{PacketList|{{change|0x28|0x2A}}|Update Structure Block|pre=unchanged}}
{{PacketList|{{Change|0x1D|0x1F}}|Use Item|pre=unchanged}}
+
{{PacketList|{{change|0x29|0x2B}}|Update Sign|pre=unchanged}}
{{PacketList|0x20|Advancement Tab|rel=added}}
+
{{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 ==
  
=== Entity Metadata ===
+
No changes so far.
 +
 
 +
== Entity Metadata ==
 +
 
 +
{{#vardefine:meta_prerelease|1}}
  
Note that entity metadata is a totally distinct concept from block metadata.  It is not required to send all metadata fields, or even any metadata fields, so long as the terminating entry is correctly sent.
+
=== FishingHook ===
  
Entity Metadata is an array of entries, each of which looks like the following:
+
{{Metadata inherit|FishingHook|inherits=Entity|start_at=7}}
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Name
+
  ! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 +
|-
 +
| {{Metadata id|}}
 +
| VarInt
 +
|colspan="2"| Hooked entity id + 1, or 0 if there is no hooked entity
 +
| 0
 +
|- {{Added}}
 +
| {{Metadata id|added}}
 +
| Boolean
 +
|colspan="2"| Is catchable
 +
| False
 +
|}
 +
 
 +
=== Abstract Arrow ===
 +
 
 +
{{Metadata inherit|Abstract Arrow|inherits=Entity|start_at=7}}
 +
 
 +
Abstract base class for [[#Tipped Arrow|Tipped Arrow]] (which is used for regular arrows as well as tipped ones) and [[#Spectral Arrow|Spectral Arrow]].
 +
 
 +
{| class="wikitable"
 +
! Index
 
  ! Type
 
  ! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 +
|-
 +
| rowspan="3" | {{Metadata id|}}
 +
| rowspan="3" | Byte
 +
! Bit mask
 
  ! Meaning
 
  ! Meaning
 +
| rowspan="3" | 0
 
  |-
 
  |-
  | Index
+
  | 0x01
  | Unsigned Byte
+
  | Is critical
| Unique index key determining the meaning of the following value, see the table below. If this is <code>0xff</code> then the it is the end of the Entity Metadata array and no more is read.
 
 
  |-
 
  |-
  | Type
+
  | 0x02
  | Optional Byte Enum
+
  | Is noclip (used by loyalty tridents when returning)
  | Only if Index is not <code>0xff</code>; the type of the index, see the table below
+
  |- {{removed}}
 +
| {{Metadata id|removed}}
 +
| OptUUID
 +
|colspan="2"| Unused
 +
| Empty
 
  |-
 
  |-
  | Value
+
  | {{Metadata id|}}
  | Optional ''value of Type''
+
  | Byte
  | Only if Index is not <code>0xff</code>: the value of the metadata field
+
|colspan="2"| Peircing level
 +
  | 0
 
  |}
 
  |}
 +
 +
=== Tipped Arrow ===
 +
 +
{{Metadata inherit|Tipped Arrow|inherits=Abstract Arrow}}
 +
 +
Used for both tipped and regular arrows.  If not tipped, then color is set to -1 and no tipped arrow particles are used.
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Value of Type field
+
  ! Index
  ! [[Data types|Type]] of Value field
+
! Type
  ! Notes
+
  !style="width: 250px;" colspan="2"| Meaning
 +
  ! Default
 
  |-
 
  |-
  | 0
+
  | {{Metadata id|}}
| Byte
 
|
 
|-
 
| 1
 
 
  | VarInt
 
  | VarInt
  |  
+
  |colspan="2"| Color (-1 for no particles)
|-
+
  | -1
| 2
 
| Float
 
|
 
|-
 
| 3
 
| String
 
|
 
|-
 
| 4
 
| [[Chat]]
 
|
 
|-
 
| 5
 
| [[Slot]]
 
|
 
|-
 
| 6
 
| Boolean
 
|
 
|-
 
| 7
 
| Rotation
 
| 3 floats: rotation on x, rotation on y, rotation on z
 
|-
 
| 8
 
| [[Data Types#Position|Position]]
 
|
 
|-
 
| 9
 
| OptPosition (Boolean + Optional Position)
 
| Position is present if the Boolean is set to true
 
|-
 
| 10
 
| Direction (VarInt)
 
| (Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5)
 
  |-
 
| 11
 
| OptUUID (Boolean + Optional UUID)
 
| UUID is present if the Boolean is set to true
 
|-
 
| 12
 
| OptBlockID (VarInt)
 
| 0 for absent otherwise, <code><nowiki>id &lt;&lt; 4 | data</nowiki></code>
 
|-style="background-color: #d9ead3;"
 
| 13
 
| [[NBT|NBT Tag]]
 
|
 
 
  |}
 
  |}
  
Entity classes also recursively inherit fields from classes they extend.
+
=== Spectral Arrow ===
  
=== IllusionIllager ===
+
{{Metadata inherit|Spectral Arrow|inherits=Abstract Arrow}}
  
Extends [[#EvocationIllager|EvocationIllager]].
+
No additional metadata.
  
* ''Entity ID: '''37'''.''
+
=== Trident ===
  
=== Parrot ===
+
{{Metadata inherit|Trident|inherits=Abstract Arrow}}
  
Extends [[#TameableAnimal|TameableAnimal]].
+
{| class="wikitable"
 
 
{| class="wikitable" style="background-color: #d9ead3;"
 
 
  ! Index
 
  ! Index
 
  ! Type
 
  ! Type
Line 236: Line 243:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | 15
+
  | {{Metadata id|}}
 
  | VarInt
 
  | VarInt
  |colspan="2"| Variant (0: red/blue, 1: blue, 2: green, 3: yellow/blue, 4: silver)
+
  |colspan="2"| Loyalty level (enchantment)
 
  | 0
 
  | 0
 +
|-
 +
| {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Has enchantment glint
 +
| False
 
  |}
 
  |}
  
* ''Entity ID: '''105'''.''
+
=== Strider ===
  
=== Player ===
+
{{Metadata inherit|Strider|inherits=Animal|start_at=16}}
  
Extends [[#Living|Living]].
+
{| class="wikitable" {{added}}
 
 
{| class="wikitable"
 
 
  ! Index
 
  ! Index
 
  ! Type
 
  ! Type
Line 254: Line 264:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | 11
+
  | {{Metadata id|}}
| Float
 
|colspan="2"| Additional Hearts
 
| 0.0
 
|-
 
| 12
 
 
  | VarInt
 
  | VarInt
  |colspan="2"| Score
+
  |colspan="2"| Total time to "boost" with warped fungus on a stick for
 
  | 0
 
  | 0
 
  |-
 
  |-
  |rowspan="10"| 13
+
  | {{Metadata id|}}
  |rowspan="10"| Byte
+
  | Boolean
  |colspan="2"| The Displayed Skin Parts bit mask that is sent in [[Protocol#Client Settings|Client Settings]]
+
  |colspan="2"| Is shaking (true unless riding a vehicle or on or in a block tagged with strider_warm_blocks (default: lava))
  |rowspan="10"| 0
+
  | false
 
  |-
 
  |-
  ! Bit mask !! Meaning
+
| {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Has saddle
 +
| false
 +
|}
 +
 
 +
=== Hoglin ===
 +
 
 +
{{Metadata inherit|Hoglin|inherits=Animal|start_at=16}}
 +
 
 +
{| class="wikitable" {{added}}
 +
  ! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  | 0x01 || Cape enabled
+
  | {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Is immune to zombification
 +
| false
 +
|}
 +
 
 +
=== Zoglin ===
 +
 
 +
{{Metadata inherit|Hoglin|inherits=Monster|start_at=15}}
 +
 
 +
{| class="wikitable" {{added}}
 +
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  | 0x02 || Jacket enabled
+
  | {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Is baby
 +
| false
 +
|}
 +
 
 +
=== Base Piglin ===
 +
 
 +
{{Metadata inherit|Base Piglin|inherits=Monster|start_at=15}}
 +
 
 +
{| class="wikitable" {{added}}
 +
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  | 0x04 || Left sleeve enabled
+
  | {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Is immune to zombification
 +
| false
 +
|}
 +
 
 +
=== Piglin ===
 +
 
 +
{{Metadata inherit|Piglin|inherits=Base Piglin}}
 +
 
 +
{| class="wikitable" {{added}}
 +
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  | 0x08 || Right sleeve enabled
+
  | {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Is baby
 +
| false
 
  |-
 
  |-
  | 0x10 || Left pants leg enabled
+
  | {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Is charging crossbow
 +
| false
 
  |-
 
  |-
  | 0x20 || Right pants leg enabled
+
  | {{Metadata id|}}
|-
+
  | Boolean
| 0x40 || Hat enabled
+
  |colspan="2"| Is dancing
|-
+
  | false
| 0x80 || ''Unused''
 
|-
 
| 14
 
| Byte
 
|colspan="2"| Main hand (0 : Left, 1 : Right)
 
| 1
 
|- style="background-color: #d9ead3;"
 
| 15
 
| NBT Tag
 
|colspan="2"|Left shoulder entity data
 
|
 
|- style="background-color: #d9ead3;"
 
| 16
 
  | NBT Tag
 
  |colspan="2"|Right shoulder entity data
 
  |  
 
 
  |}
 
  |}
  
== Block Actions ==
+
=== Piglin Brute ===
  
== Note Block ==
+
{{Metadata inherit|Piglin Brute|inherits=Base Piglin}}
  
Displays a colored note particle and plays the appropriate note sound effect.
+
No additional metadata.
  
=== Action IDs ===
+
=== Wolf ===
  
The action ID is used to determine the instrument to play.
+
{{Metadata inherit|Wolf|inherits=TameableAnimal|start_at=18}}
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  ! Type ID
+
  | {{Metadata id|}}
  ! Instrument
+
  | Boolean
  ! Material/block
+
  |colspan="2"| Is begging
  ! Sound
+
  | false
 
  |-
 
  |-
 +
| {{Metadata id|}}
 +
| VarInt
 +
|colspan="2"| Collar color (values are those {{Minecraft Wiki|Data_values#Dyes|used with dyes}})
 +
| 14 (Red)
 +
|- {{Added}}
 +
| {{Metadata id|}}
 +
| VarInt
 +
|colspan="2"| Anger time
 
  | 0
 
  | 0
| Harp
 
| Any other material
 
| <code>block.note.harp</code>
 
|-
 
| 1
 
| Bass Drum
 
| Stone
 
| <code>block.note.harp</code>
 
|-
 
| 2
 
| Snare Drum
 
| Sand
 
| <code>block.note.snare</code>
 
|-
 
| 3
 
| Clicks/Sticks
 
| Glass
 
| <code>block.note.hat</code>
 
|-
 
| 4
 
| Bass guitar
 
| Wood
 
| <code>block.note.bass</code>
 
|- style="background-color: #d9ead3;"
 
| 5
 
| Flute
 
| Clay
 
| <code>block.note.flute</code>
 
|- style="background-color: #d9ead3;"
 
| 6
 
| Bell
 
| Gold block
 
| <code>block.note.bell</code>
 
|- style="background-color: #d9ead3;"
 
| 7
 
| Guitar
 
| Wool
 
| <code>block.note.guitar</code>
 
|- style="background-color: #d9ead3;"
 
| 8
 
| Chime
 
| Packed ice
 
| <code>block.note.chime</code>
 
|- style="background-color: #d9ead3;"
 
| 9
 
| Xylophone
 
| Bone block
 
| <code>block.note.xylophone</code>
 
 
  |}
 
  |}
  
Any unknown ID is treated as if it were <code>0</code>.
+
=== {{Change|Zombie Pigman|Zombified Piglin}} ===
  
The sound event <code>block.note.pling</code> is unassigned and unused.
+
{{Metadata inherit|{{Change|Zombie Pigman|Zombified Piglin}}|inherits=Zombie|start_at=18}}
  
=== Action param ===
+
No additional metadata.
  
The pitch of the note (between 0–24 inclusive where 0 is the lowest and 24 is the highest). More information about how the pitch values correspond to notes in real life and how they correspond to pitch scaling on the sound effects can be found in the {{Minecraft Wiki|Note Block}} article on the Minecraft wiki.
+
== Block Actions ==
  
== Chat components ==
+
No changes so far.
  
==== Translation component ====
+
== Inventories ==
  
{{Need Info|Is using this with an invalid key intended or deprecated?  Also, what exactly happens on invalid formats?}}
+
No changes so far.
 +
 
 +
== Plugin Channels ==
  
Translates text into the current language.  If the JSON contains a <code>translate</code> key, then the component is a translation component.
+
No changes so far.
  
Translation supports <code>%s</code> and <code>%%</code> format tokens.  <code>%%</code> is just an escaped percent symbol.  <code>%s</code> marks text to replace using content from the optional <code>with</code> tag.  <code>with</code> is an array of components.
+
== Play ==
  
{{Change||As a special case, if the translation key is <code>chat.type.text</code>, it will be changed to <code>chat.type.text.narrate</code> when passed to narrator (although it will remain as <code>chat.type.text</code> in chat).}}
+
=== Clientbound ===
  
==== Keybind component ====
+
==== Chat Message (clientbound) ====  
  
{{change||Displays the client's current keybind for the specified key.  If the component contains a <code>keybind</code> key, then it is a keybind component.  The value is named after the keys in {{Minecraft Wiki|options.txt}} (for instance, for <code>key_key.forward</code> in options.txt, <code>key.forward</code> would be used in the component and <kbd>W</kbd> would be displayed)For keys that are not known, the value provided should be displayed instead (for instance <code>key.invalid</code> would remain as <code>key.invalid</code>).}}
+
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.
  
== Plugin Channels ==
+
{{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.}}
  
No changes so far.
+
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="3"| {{change|0x0F|0x0E}}
 +
|rowspan="3"| Play
 +
|rowspan="3"| Client
 +
| JSON Data
 +
| [[Chat]]
 +
| Limited to 32767 bytes
 +
|-
 +
| Position
 +
| Byte
 +
| 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar).
 +
|- {{added}}
 +
| 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.
 +
|}
  
== Play ==
+
==== Chunk Data ====
 +
{{Main|Chunk Format}}
 +
{{See also|#Unload Chunk}}
  
=== Clientbound ===
+
{{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)}}
  
==== Advancements ====
+
The server only sends skylight information for chunk pillars in the {{Minecraft Wiki|Overworld}}, it's up to the client to know in which dimenison the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent.  This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with [[#Update Block Entity|Update Block Entity]] later).
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 409: Line 450:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="9"| 0x08
+
  |rowspan="12"| {{change|0x22|0x20}}
  |rowspan="9"| Play
+
  |rowspan="12"| Play
  |rowspan="9"| Client
+
  |rowspan="12"| Client
  |colspan="2"| Reset/Clear
+
  | Chunk X
  |colspan="2"| Boolean
+
  | Int
  | Whether to reset/clear the current advancements
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  |colspan="2"| Mapping size
+
  | Chunk Z
  |colspan="2"| VarInt
+
  | Int
  | Size of the following array
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  |rowspan="2"| Advancement mapping
+
  | Full chunk
  | Key
+
| Boolean
  |rowspan="2"| Array
+
  | See [[Chunk Format#Full chunk|Chunk Format]]
  | Identifier
+
  |- {{Added}}
  | The identifier of the advancement
+
| Ignore old data
 +
  | Boolean
 +
  | If false, the client will recalculate lighting based on the old/new chunk data
 
  |-
 
  |-
  | Value
+
  | Primary Bit Mask
  | Advancement
+
  | VarInt
  | See below
+
  | 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).
 
  |-
 
  |-
  |colspan="2"| List size
+
  | Heightmaps
  |colspan="2"| VarInt
+
| [[NBT]]
  | Size of the following array
+
  | 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.
 
  |-
 
  |-
  |colspan="2"| Identifiers
+
  | Biomes
  |colspan="2"| Array of Identifier
+
| Optional array of {{change|Integer|VarInt}}
  | The identifiers of the advancements that should be removed
+
  | {{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
 +
| VarInt
 +
  | Size of Data in bytes
 
  |-
 
  |-
  |colspan="2"| Progress size
+
  | Data
  |colspan="2"| VarInt
+
  | Byte array
  | Size of the following array
+
  | See [[Chunk Format#Data structure|data structure]] in Chunk Format
 
  |-
 
  |-
  |rowspan="2"| Progress mapping
+
  | Number of block entities
| Key
+
  | VarInt
|rowspan="2"| Array
+
  | Number of elements in the following array
  | Identifier
 
  | The identifier of the advancement
 
 
  |-
 
  |-
  | Value
+
  | Block entities
  | Advancement progress
+
  | Array of [[NBT|NBT Tag]]
  | See below
+
  | All block entities in the chunk.  Use the x, y, and z tags in the NBT to determine their positions.
 
  |}
 
  |}
  
Advancement structure:
+
Note that the Notchian client requires an [[#Update View Position|Update View Position]] packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.
 +
 
 +
{{Change||The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.}}
 +
 
 +
==== Update Light ====
 +
 
 +
Updates light levels for a chunk.
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 
  !colspan="2"| Field Name
 
  !colspan="2"| Field Name
 
  !colspan="2"| Field Type
 
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |colspan="2"| Has parent
+
|rowspan="11"| {{change|0x25|0x23}}
 +
|rowspan="11"| Play
 +
|rowspan="11"| Client
 +
|colspan="2"| Chunk X
 +
|colspan="2"| VarInt
 +
| Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|-
 +
|colspan="2"| Chunk Z
 +
|colspan="2"| VarInt
 +
| Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|- {{added}}
 +
  |colspan="2"| Trust Edges
 
  |colspan="2"| Boolean
 
  |colspan="2"| Boolean
  | Indicates whether the next field exists.
+
  | If edges should be trusted for light updates.
 +
|
 
  |-
 
  |-
  |colspan="2"| Parent id
+
  |colspan="2"| Sky Light Mask
  |colspan="2"| Optional Identifier
+
  |colspan="2"| VarInt
  | The identifier of the parent advancement.
+
  | Mask containing 18 bits, with the lowest bit corresponding to chunk section -1 (in the void, y=-16 to y=-1) and the highest bit for chunk section 16 (above the world, y=256 to y=271)
 
  |-
 
  |-
  |colspan="2"| Has display
+
  |colspan="2"| Block Light Mask
  |colspan="2"| Boolean
+
  |colspan="2"| VarInt
  | Indicates whether the next field exists
+
  | Mask containing 18 bits, with the same order as sky light
 
  |-
 
  |-
  |colspan="2"| Display data
+
  |colspan="2"| Empty Sky Light Mask
  |colspan="2"| Optional advancement display
+
  |colspan="2"| VarInt
  | See below.
+
  | Mask containing 18 bits, which indicates sections that have 0 for all their sky light values.  If a section is set in both this mask and the main sky light mask, it is ignored for this mask and it is included in the sky light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the sky light arrays.
 
  |-
 
  |-
  |colspan="2"| Number of criteria
+
  |colspan="2"| Empty Block Light Mask
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
  | Size of the following array
+
  | Mask containing 18 bits, which indicates sections that have 0 for all their block light values.  If a section is set in both this mask and the main block light mask, it is ignored for this mask and it is included in the block light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the block light arrays.
 
  |-
 
  |-
  |rowspan="2"| Criteria
+
  |rowspan="2"| Sky Light arrays
  | Key
+
  | Length
 
  |rowspan="2"| Array
 
  |rowspan="2"| Array
  | Identifier
+
  | VarInt
  | The identifier of the criterion
+
  | Length of the following array in bytes (always 2048)
|-
 
| Value
 
| '''Void'''
 
| There is ''no'' content written here.  Perhaps this will be expanded in the future?
 
 
  |-
 
  |-
  |colspan="2"| Array length
+
  | Sky Light array
  |colspan="2"| VarInt
+
  | Array of 2048 bytes
  | Number of arrays in the following array
+
  | There is 1 array for each bit set to true in the sky light mask, starting with the lowest value.  Half a byte per light value.
 
  |-
 
  |-
  |rowspan="2"| Requirements
+
  |rowspan="2"| Block Light arrays
  | Array length 2
+
  | Length
 
  |rowspan="2"| Array
 
  |rowspan="2"| Array
 
  | VarInt
 
  | VarInt
  | Number of elements in the following array
+
  | Length of the following array in bytes (always 2048)
 
  |-
 
  |-
  | Requirement
+
  | Block Light array
  | Array of String
+
  | Array of 2048 bytes
  | Array of required criteria
+
  | 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.
 
  |}
 
  |}
  
Advancement display:
+
Individual block or sky light arrays are is given for each block with increasing x coordinates, within rows of increasing z coordinates, within layers of increasing y coordinates. Even-indexed items (those with an even x coordinate, starting at 0) are packed into the low bits, odd-indexed into the high bits.
 +
 
 +
==== Join Game ====
 +
 
 +
See [[Protocol Encryption]] for information on logging in.
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 
  ! Field Name
 
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | Title
+
  |rowspan="16"| {{change|0x26|0x24}}
  | Chat
+
|rowspan="16"| Play
 +
|rowspan="16"| Client
 +
| Entity ID
 +
| Int
 +
| The player's Entity ID (EID)
 +
|-
 +
| Is hardcore
 +
  | Boolean
 
  |
 
  |
 
  |-
 
  |-
  | Description
+
  | Gamemode
  | Chat
+
  | Unsigned Byte
  |
+
  | 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]]
 +
| This CompoundTag contains a ListTag named "dimension". The ListTag should contain CompoundTags with named StringTags "key" and "element". The full extent of these is still unknown, but the tag represents a dimension registry. See below for the vanilla default.
 +
|-
 +
| Dimension
 +
| {{change|Int Enum|Identifier}}
 +
| {{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
 +
| Unsigned Byte
 +
| 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)
 
  |-
 
  |-
  | Icon
+
  | Reduced Debug Info
  | [[Slot]]
+
  | 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.
 
  |-
 
  |-
  | Frame type
+
  | Enable respawn screen
  | VarInt enum
+
  | Boolean
  | 0 = <code>task</code>, 1 = <code>challenge</code>, 2 = <code>goal</code>
+
  | 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
 +
|}
 +
Example of Dimension codec CompoundTag sent by the server:
 +
    ListTag (Type: CompoundTag) "dimension":
 +
        CompoundTag:
 +
            StringTag "name" value: 'minecraft:overworld'
 +
            ByteTag "natural": 1
 +
            Some more attributes ...
 +
 
 +
Known attributes :
 +
 
 +
{| class="wikitable"
 +
! Name
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Values
 
  |-
 
  |-
  | Flags
+
  | name
  | Integer
+
  | String
  | 0x1: has background texture; 0x2: <code>show_toast</code>; 0x4: <code>hidden</code>
+
  |colspan="2"| Dimension's name
 +
| "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
 
  |-
 
  |-
  | Background texture
+
  | natural
  | Optional Identifier
+
  | Byte
  | Background texture location. Only if flags indicates it.
+
  |colspan="2"| Is it a standard overworld like dimension
 +
  | 1: true, 0: false
 
  |-
 
  |-
  | X coord
+
  | ambient_light
 
  | Float
 
  | Float
  |  
+
  |colspan="2"| Ambient light
 +
| 0.0 to 1.0
 +
|-
 +
| has_ceiling
 +
| Byte
 +
|colspan="2"| Does the dimension have blocks on top ? Like the nether
 +
| 1: true, 0: false
 +
|-
 +
| has_skylight
 +
| Byte
 +
|colspan="2"| Does the dimension have natural sky light
 +
| 1: true, 0: false
 +
|-
 +
| fixed_time
 +
| Long
 +
|colspan="2"| Set fixed minecraft clock time
 +
| 0 to 12000
 +
|-
 +
| shrunk
 +
| Byte
 +
|colspan="2"| ?
 +
| 1: true, 0: false
 +
|-
 +
| ultrawarm
 +
| Byte
 +
|colspan="2"| ?
 +
| 1: true, 0: false
 +
|-
 +
| has_raids
 +
| Byte
 +
|colspan="2"| ?
 +
| 1: true, 0: false
 +
|-
 +
| respawn_anchor_works
 +
| Byte
 +
|colspan="2"| Wether or not respawn anchor can be used
 +
| 1: true, 0: false
 +
|-
 +
| bed_works
 +
| Byte
 +
|colspan="2"| Wether or not beds can be used
 +
| 1: true, 0: false
 +
|-
 +
| piglin_safe
 +
| Byte
 +
|colspan="2"| ?
 +
| 1: true, 0: false
 +
|-
 +
| logical_height
 +
| Int
 +
|colspan="2"| Maybe the world's max height in blocks ?
 +
| 0-256
 
  |-
 
  |-
  | Y coord
+
  | infiniburn
  | Float
+
  | String
  |  
+
  |colspan="2"| ?
 +
| "" or minecraft resource "minecraft:..."
 
  |}
 
  |}
  
Advancement progress:
+
==== Unlock Recipes ====
  
 
{| class="wikitable"
 
{| class="wikitable"
  !colspan="2"| Field Name
+
  ! Packet ID
  !colspan="2"| Field Type
+
! State
 +
! Bound To
 +
! Field Name
 +
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |colspan="2"| Size
+
  |rowspan="14"| {{Change|0x37|0x35}}
  |colspan="2"| VarInt
+
|rowspan="14"| Play
  | Size of the following array
+
  |rowspan="14"| 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.
 +
|- {{added}}
 +
| Blast Furance Recipe Book Open
 +
| Boolean
 +
| If true, then the blast furnace recipe book will be open when the player opens its inventory.
 +
|- {{added}}
 +
| Blast Furance Recipe Book Filter Active
 +
| Boolean
 +
| If true, then the filtering option is active when the players opens its inventory.
 +
|- {{added}}
 +
| Smoker Recipe Book Open
 +
| Boolean
 +
| If true, then the smoker recipe book will be open when the player opens its inventory.
 +
|- {{added}}
 +
| Smoker Recipe Book Filter Active
 +
| Boolean
 +
| If true, then the filtering option is active when the players opens its inventory.
 +
|-
 +
| Array size 1
 +
| VarInt
 +
  | Number of elements in the following array
 +
|-
 +
| Recipe IDs
 +
| Array of Identifier
 +
|
 
  |-
 
  |-
  |rowspan="2"| Criteria
+
  | Array size 2
| Criterion identifier
+
  | Optional VarInt
|rowspan="2"| Array
+
  | Number of elements in the following array, only present if mode is 0 (init)
  | Identifier
 
  | The identifier of the criterion.
 
 
  |-
 
  |-
  | Criterion progress
+
  | Recipe IDs
  | Criterion progress
+
  | Optional Array of Identifier, only present if mode is 0 (init)
 
  |
 
  |
 
  |}
 
  |}
 +
Action:
 +
* 0 (init) = All the recipes in the list 2 will added to the recipe book. All the recipes in list 1 will be tagged as displayed, recipes that aren't tagged will be shown in the notification. VERIFY LIST ORDER?
 +
* 1 (add) = All the recipes in the list are added and their icon will be shown in the notification.
 +
* 2 (remove) = Remove all the recipes in the list. This allows them to re-displayed when they are readded.
 +
 +
==== Respawn ====
  
Criterion progress:
+
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"
 +
! Packet ID
 +
! State
 +
! Bound To
 
  ! Field Name
 
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | Achieved
+
  |rowspan="10"| {{Change|0x3B|0x39}}
 +
|rowspan="10"| Play
 +
|rowspan="10"| Client
 +
| Dimension
 +
| {{change|Int Enum|Identifier}}
 +
| {{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
 
  | Boolean
  | If true, next field is present
+
  | True if the world is a {{Minecraft Wiki|debug mode}} world; debug mode worlds cannot be modified and have predefined blocks
  |-
+
  |- {{Added}}
  | Date of achieving
+
| Is Flat
  | Optional Long
+
| Boolean
  | As returned by [https://docs.oracle.com/javase/6/docs/api/java/util/Date.html#getTime() <code>Date.getTime</code>]
+
  | 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.
 
  |}
 
  |}
  
==== Update Block Entity ====
+
{{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.}}
  
Sets tile entity associated with the block at the given location.
+
==== Multi Block Change ====
  
{| class="wikitable"
+
{| class="wikitable" {{added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 599: Line 885:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| {{Change|0x09|0x0A}}
+
  |rowspan="3"| {{Change|0x10|0x3B}}
 
  |rowspan="3"| Play
 
  |rowspan="3"| Play
 
  |rowspan="3"| Client
 
  |rowspan="3"| Client
  | Location
+
  |
  | Position
+
  | Long
  |  
+
  | Chunk section coordinate (encoded chunk x and z with each 22 bits, and section y with 20 bits, from left to right)
 
  |-
 
  |-
  | Action
+
  | Array size
  | Unsigned Byte
+
  | VarInt
  | The type of update to perform, see below
+
  | Number of elements in the following array
 
  |-
 
  |-
  | NBT Data
+
  |  
  | [[NBT|NBT Tag]]
+
  | Array of VarLong
  | Data to set.  May be a TAG_END (0), in which case the block entity at the given location is removed (though this is not required since the client will remove the block entity automatically on chunk unload or block removal)
+
  | 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).
 
  |}
 
  |}
  
''Action'' field:
+
==== Entity Properties ====
  
* '''1''': Set data of a mob spawner (everything except for SpawnPotentials: current delay, min/max delay, mob to be spawned, spawn count, spawn range, etc.)
+
Sets {{Minecraft Wiki|Attribute|attributes}} on the given entity.
* '''2''': Set command block text (command and last execution status)
 
* '''3''': Set the level, primary, and secondary powers of a beacon
 
* '''4''': Set rotation and skin of mob head
 
* '''5''': Set type of flower in flower pot
 
* '''6''': Set base color and patterns on a banner
 
* '''7''': Set the data for a Structure tile entity
 
* '''8''': Set the destination for a end gateway
 
* '''9''': Set the text on a sign
 
* '''10''': Declare a shulker box (unclear if there is any actual data)
 
* {{Change||'''11''': Set the color of a bed}}
 
 
 
==== Unlock Recipes ====
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 639: Line 913:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="8"| 0x31
+
  |rowspan="6"| {{change|0x59|0x58}}
  |rowspan="8"| Play
+
  |rowspan="6"| Play
  |rowspan="8"| Client
+
  |rowspan="6"| Client
 +
|colspan="2"| Entity ID
 +
|colspan="2"| VarInt
 +
|
 
  |-
 
  |-
  |colspan="2"| Action
+
  |colspan="2"| Number Of Properties
  |colspan="2"| Short
+
  |colspan="2"| Int
  | The action, see below
+
  | Number of elements in the following array
 
  |-
 
  |-
  |colspan="2"| Crafting Book Open
+
  |rowspan="4"| Property
  |colspan="2"| Boolean
+
  | Key
  | If true, then the crafting book will be open when the player opens its inventory.
+
|rowspan="4"| Array
 +
| {{Change|String (64)|Identifier}}
 +
  | See below
 
  |-
 
  |-
  |colspan="2"| Filtering Craftable
+
  | Value
  |colspan="2"| Boolean
+
  | Double
  | If true, then the filtering option is active when the players opens its inventory.
+
  | See below
 
  |-
 
  |-
  |colspan="2"| Array size 1
+
  | Number Of Modifiers
  |colspan="2"| VarInt
+
  | VarInt
 
  | Number of elements in the following array
 
  | Number of elements in the following array
 
  |-
 
  |-
  |rowspan="1"| Recipe ID
+
  | Modifiers
  |
+
| Array of Modifier Data
  |rowspan="1"| Array
+
| See {{Minecraft Wiki|Attribute#Modifiers}}. Modifier Data defined below.
  | Integer
+
|}
  |
+
 
 +
Known Key values (see also {{Minecraft Wiki|Attribute#Modifiers}}):
 +
 
 +
{| class="wikitable"
 +
|-
 +
! 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
 +
|-
 +
| {{change|generic.movementSpeed|generic.movement_speed}}
 +
| 0.7
 +
| 0.0
 +
| 1024.0
 +
| Movement Speed
 +
|-
 +
| {{change|generic.attackDamage|generic.attack_damage}}
 +
| 2.0
 +
| 0.0
 +
| 2048.0
 +
| Attack Damage
 +
|-
 +
| {{change|generic.attackSpeed|generic.attack_speed}}
 +
| 4.0
 +
| 0.0
 +
| 1024.0
 +
| Attack Speed
 +
|-
 +
| {{change|generic.flyingSpeed|generic.flying_speed}}
 +
| 0.4
 +
| 0.0
 +
| 1024.0
 +
| Flying Speed
 +
|-
 +
| generic.armor
 +
| 0.0
 +
| 0.0
 +
| 30.0
 +
| Armor
 +
|-
 +
| {{change|generic.armorToughness|generic.armor_toughness}}
 +
| 0.0
 +
| 0.0
 +
| 20.0
 +
| Armor Toughness
 +
|-
 +
| {{change|generic.attackKnockback|generic.attack_knockback}}
 +
| 0.0
 +
| 0.0
 +
| 5.0
 +
| &mdash;
 +
|-
 +
| generic.luck
 +
| 0.0
 +
| -1024.0
 +
| 1024.0
 +
| Luck
 +
|-
 +
| {{change|horse.jumpStrength|horse.jump_strength}}
 +
| 0.7
 +
| 0.0
 +
| 2.0
 +
| Jump Strength
 +
|-
 +
| {{change|zombie.spawnReinforcements|zombie.spawn_reinforcements}}
 +
| 0.0
 +
| 0.0
 +
  | 1.0
 +
  | Spawn Reinforcements Chance
 
  |-
 
  |-
  |colspan="2"| Array size 2
+
  | generic.reachDistance
  |colspan="2"| VarInt
+
| 5.0
  | Number of elements in the following array
+
  | 0.0
 +
| 1024.0
 +
  | Player Reach Distance (Forge only)
 
  |-
 
  |-
  |rowspan="1"| Recipe ID
+
  | forge.swimSpeed
  |
+
  | 1.0
  |rowspan="1"| Array
+
  | 0.0
  | Integer
+
  | 1024.0
  |
+
  | Swimming Speed (Forge only)
 
  |}
 
  |}
Action:
 
* 1 = All the recipes in the list 1 are added and their icon will be shown in the notification. The notification will only show up if all the recipes in this list weren't displayed before (removing the recipe resets this). All the recipes in the list 2 will added to the recipe book.
 
* 2 = Remove all the recipes in the list 1. This allows them to re-displayed when they are readded.
 
* 3 = All the recipes in the list 2 will added to the recipe book. All the recipes in list 1 will be tagged as displayed. No notification will be shown.
 
  
Recipe ID:
+
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.
These are hardcoded values in the client and server, all the recipe json files will be loaded in a specific order (alphabetical, like sounds) and internal ids will be assigned in that order. There are also inbuilt recipes like fireworks, banners, etc., these are the first recipes to have their id assigned. Due the fact that the recipes are loaded in a specific order will the ids very likely change when recipes get added. Custom recipes are scheduled for Minecraft 1.13, so most likely will things change a bit in that version.
 
  
==== Advancement Progress ====
+
''Modifier Data'' structure:
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  |-
! State
 
! Bound To
 
 
  ! Field Name
 
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x4E
+
  | UUID
  |rowspan="2"| Play
+
| UUID
  |rowspan="2"| Client
+
  |  
  | Has id
+
  |-
  | Boolean
+
  | Amount
  | Indicates if the next field is present
+
  | Double
 +
  | May be positive or negative
 
  |-
 
  |-
  | ID
+
  | Operation
  | Optional Identifier
+
  | Byte
  |
+
  | See below
 
  |}
 
  |}
 
=== Serverbound ===
 
  
==== Prepare Crafting Grid ====
+
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 ====
 +
 
 +
{{Need Info|May have changed in 20w27a}}
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 717: Line 1,087:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="12"| 0x01
+
  |rowspan="4"| {{change|0x5B|0x5A}}
  |rowspan="12"| Play
+
  |rowspan="4"| Play
  |rowspan="12"| Server
+
  |rowspan="4"| Client
  |colspan="2"| Window ID
+
  |colspan="2"| Num Recipes
  |colspan="2"| Byte
+
  |colspan="2"| VarInt
  | The window id.
+
| Number of elements in the following array
 +
|-
 +
|rowspan="3"| Recipe
 +
| Recipe ID
 +
|rowspan="3"| 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:
 +
 
 +
{| class="wikitable"
 +
! Type
 +
! Description
 +
! Data
 +
|-
 +
| <code>crafting_shapeless</code>
 +
| Shapeless crafting recipe.  All items in the ingredient list must be present, but in any order/slot.
 +
| 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 count
 +
    | VarInt
 +
    | Number of elements in the following array
 +
    |-
 +
    | Ingredients
 +
    | Array of Ingredient
 +
    |
 +
    |-
 +
    | Result
 +
    | [[Slot]]
 +
    |
 +
    |}
 +
|-
 +
| <code>crafting_shaped</code>
 +
| Shaped crafting recipe.  All items must be present in the same pattern (which may be flipped horizontally or translated)
 +
| As follows:
 +
  {| class="wikitable"
 +
    ! 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]]
 +
    |
 +
    |}
 +
|-
 +
| <code>crafting_special_armordye</code>
 +
| Recipe for dying leather armor
 +
|rowspan="13"| None
 +
|-
 +
| <code>crafting_special_bookcloning</code>
 +
| Recipe for copying contents of written books
 +
|-
 +
| <code>crafting_special_mapcloning</code>
 +
| Recipe for copying maps
 +
|-
 +
| <code>crafting_special_mapextending</code>
 +
| Recipe for adding paper to maps
 +
|-
 +
| <code>crafting_special_firework_rocket</code>
 +
| Recipe for making firework rockets
 +
|-
 +
| <code>crafting_special_firework_star</code>
 +
| Recipe for making firework stars
 +
|-
 +
| <code>crafting_special_firework_star_fade</code>
 +
| Recipe for making firework stars fade between multiple colors
 +
|-
 +
| <code>crafting_special_repairitem</code>
 +
| Recipe for repairing items via crafting
 +
|-
 +
| <code>crafting_special_tippedarrow</code>
 +
| Recipe for crafting tipped arrows
 
  |-
 
  |-
  |colspan="2"| Action number
+
  | <code>crafting_special_bannerduplicate</code>
|colspan="2"| Short
+
  | Recipe for copying banner patterns
  | The transaction number. Will be send to the client in a Confirm Transaction packet.
 
 
  |-
 
  |-
  |colspan="2"| Array size
+
  | <code>crafting_special_banneraddpattern</code>
|colspan="2"| Short
+
  | Recipe for adding patterns to banners
  | Number of elements in the following array
 
 
  |-
 
  |-
  |rowspan="3"| Return Entry
+
  | <code>crafting_special_shielddecoration</code>
| Item
+
  | Recipe for applying a banner's pattern to a shield
|rowspan="3"| Array
 
| Slot
 
  | The item stack that will be put in the inventory slot
 
 
  |-
 
  |-
  | Crafting Slot
+
  | <code>crafting_special_shulkerboxcoloring</code>
  | Byte
+
  | Recipe for recoloring a shulker box
| The crafting slot index in the active container
 
 
  |-
 
  |-
  | Player Slot
+
  | <code>smelting</code>
  | Byte
+
  | Smelting recipe
  | The player slot index in the player inventory
+
  |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
 +
    |
 +
    |}
 
  |-
 
  |-
  |colspan="2"| Array Size
+
  | <code>blasting</code>
|colspan="2"| Short
+
  | Blast furnace recipe
  | Number of elements in the following array
 
 
  |-
 
  |-
  |rowspan="3"| Prepare Entry
+
  | <code>smoking</code>
| Item
+
  | Smoker recipe
|rowspan="3"| Array
 
| Slot
 
  | The item stack that will be put in the crafting slot
 
 
  |-
 
  |-
  | Crafting Slot
+
  | <code>campfire_cooking</code>
  | Byte
+
  | Campfire recipe
| The crafting slot index in the active container
 
 
  |-
 
  |-
  | Player Slot
+
  | <code>stonecutting</code>
  | Byte
+
  | Stonecutter recipe
  | The player slot index in the player inventory
+
  | 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]]
 +
    |
 +
    |}
 
  |}
 
  |}
  
This packet is send when a player clicks a recipe in the crafting book that is craftable (white border).
+
Ingredient is defined as:
  
1. Return Entries:
+
{| class="wikitable"
* All the items on the crafting slot are set to null/empty.
+
! Name
* Every entry item stack will be added to the player inventory, to the specific player slot.
+
! 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.
 +
|}
  
2. Prepare Entries:
+
=== Serverbound ===
* All the items on the player inventory slots their quantity is decreased by 1.
 
* Every entry item stack will be put in the proper crafting grid slot.
 
  
The server will send a Confirm Transaction packet back to the client with the provided transaction id.
+
==== Interact Entity ====
  
==== Client Status ====
+
This packet is sent from the client to the server when the client attacks or right-clicks another entity (a player, minecart, etc).
  
Sent when the client is ready to complete login and when the client is ready to respawn after death.
+
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 789: Line 1,325:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x04
+
  |rowspan="7"| 0x0E
  |rowspan="1"| Play
+
  |rowspan="7"| Play
  |rowspan="1"| Server
+
  |rowspan="7"| Server
  | Action ID
+
  | Entity ID
 +
| VarInt
 +
| The ID of the entity to interact
 +
|-
 +
| Type
 
  | VarInt Enum
 
  | VarInt Enum
  | See below
+
  | 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
 +
|- {{Added}}
 +
| Sneaking
 +
| Boolean
 +
| If the client is sneaking.
 
  |}
 
  |}
  
''Action ID'' values:
+
==== Generate Structure ====
  
{| class="wikitable"
+
Sent when Generate is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
 +
 
 +
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  ! Action ID
+
  |rowspan="3"| 0x0F
  ! Action
+
  |rowspan="3"| Play
 +
|rowspan="3"| Server
 +
| Location
 +
| Position
 +
| Block entity location
 
  |-
 
  |-
  | 0
+
  | Levels
  | Perform respawn
+
  | VarInt
 +
| Value of the levels slider/max depth to generate
 
  |-
 
  |-
  | 1
+
  | Keep Jigsaws
  | Request stats
+
  | Boolean
  |-
+
  |
| {{Change|2|}}
 
| {{Change|Open inventory|}}
 
 
  |}
 
  |}
  
==== Crafting Book Data ====
+
==== Player Abilities (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.}}
 +
 
 +
The vanilla client sends this packet when the player starts/stops flying with the Flags parameter changed accordingly. {{change|All other parameters are ignored by the vanilla server.}}
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 820: Line 1,395:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x17
+
  |rowspan="3"| {{change|0x19|0x1A}}
  |rowspan="5"| Play
+
  |rowspan="3"| Play
  |rowspan="5"| Server
+
  |rowspan="3"| Server
  |colspan="2"| Type
+
  | Flags
  | Int
+
| Byte
  | Determines the format of the rest of the packet
+
| Bit mask. {{change|0x08: damage disabled (god mode), 0x04: can fly, }}0x02: is flying{{change|, 0x01: is Creative}}
 +
|- {{removed}}
 +
| Flying Speed
 +
| Float
 +
|
 +
|- {{removed}}
 +
| Walking Speed
 +
| Float
 +
|
 +
|}
 +
 
 +
==== Set Displayed Recipe ====
 +
 
 +
Replaces Recipe Book Data, type 0.
 +
 
 +
{| class="wikitable" {{Added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
  ! Field Type
 +
  ! Notes
 
  |-
 
  |-
  ! Type
+
|rowspan="1"| 0x1E
 +
|rowspan="1"| Play
 +
|rowspan="1"| Server
 +
| Recipe ID
 +
| Identifier
 +
|
 +
|}
 +
 
 +
==== Set Recipe Book State ====
 +
 
 +
Replaces Recipe Book Data, type 1.
 +
 
 +
{| class="wikitable" {{Added}}
 +
  ! Packet ID
 +
! State
 +
! Bound To
 
  ! Field Name
 
  ! Field Name
  !  
+
  ! Field Type
  !  
+
  ! Notes
 
  |-
 
  |-
  | 1: Displayed Recipe
+
  |rowspan="3"| 0x1F
  | Recipe ID
+
|rowspan="3"| Play
  | Int
+
|rowspan="3"| Server
  | The internal id of the displayed recipe.
+
  | Book ID
 +
  | VarInt enum
 +
  | 0: crafting, 1: furnace, 2: blast furnace, 3: smoker
 
  |-
 
  |-
  |rowspan="2"| 2: Crafting Book Status
+
  | Book Open
| Crafting Book Open
 
 
  | Boolean
 
  | Boolean
  | Whether the player has the crafting book currently openened/active.
+
  |
 
  |-
 
  |-
  | Crafting Filter
+
  | Filter Active
 
  | Boolean
 
  | Boolean
  | Whether the player has the crafting filter option currently active.
+
  |
 
  |}
 
  |}
  
The Crafting Book Status type is send when the player closes its inventory.
+
==== Update Jigsaw Block ====
  
==== Advancement Tab ====
+
Sent when Done is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 863: Line 1,475:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x20
+
  |rowspan="7"| {{Change|0x27|0x28}}
  |rowspan="2"| Play
+
|rowspan="7"| Play
  |rowspan="2"| Server
+
|rowspan="7"| Server
  | Action
+
| Location
  | VarInt enum
+
| Position
  | 0: Opened tab, 1: Closed screen
+
| Block entity location
 +
|- {{Removed}}
 +
| Attachment type
 +
| Identifier
 +
|
 +
|- {{Added}}
 +
| Name
 +
| Identifier
 +
|
 +
|- {{Added}}
 +
| Target
 +
| Identifier
 +
|
 +
|-
 +
| {{Change|Target pool|Pool}}
 +
| Identifier
 +
|
 +
|-
 +
| Final state
 +
| String
 +
| "Turns into" on the GUI, <code>final_state</code> in NBT
 +
|- {{Added}}
 +
| Joint type
 +
| String
 +
| <code>rollable</code> if the attached piece can be rotated, else <code>aligned</code>
 +
|}
 +
 
 +
==== Entity Equipment ====
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
!colspan="2"| Field Name
 +
!colspan="2"| Field Type
 +
! Notes
 +
|-
 +
|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.
 
  |-
 
  |-
  | Tab ID
+
  | Item
  | Optional identifier
+
  | [[Slot Data|Slot]]
  | Only present if action is Opened tab
+
  |
 
  |}
 
  |}
  
Line 879: Line 1,547:
 
=== Clientbound ===
 
=== Clientbound ===
  
No changes so far.
+
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 ===
 
=== Serverbound ===
 
No changes so far.
 
  
 
==== Handshake ====
 
==== Handshake ====
Line 902: Line 1,568:
 
  | Protocol Version
 
  | Protocol Version
 
  | VarInt
 
  | VarInt
  | See [[protocol version numbers]] (currently {{change|316|331}})
+
  | See [[protocol version numbers]] (currently {{change|578|738}})
 
  |-
 
  |-
 
  | 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 931: Line 1,597:
 
=== 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 ===
  
 
No changes so far.
 
No changes so far.
 +
  
 
[[Category:Minecraft Modern]]
 
[[Category:Minecraft Modern]]

Latest revision as of 10:01, 9 July 2020

This page documents the changes from the last stable Minecraft release (currently 1.15.2, protocol 578) to the current pre-release (currently 20w27a, protocol 738). 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 0x09 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
Ignore old data Boolean If false, the client will recalculate lighting based on the old/new chunk data
Primary Bit Mask VarInt Bitmask with bits set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15).
Heightmaps NBT Compound containing one long array named MOTION_BLOCKING, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a WORLD_SURFACE long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
Biomes length Optional VarInt Size of the following array. Not present if full chunk is false.
Biomes Optional array of Integer VarInt 1024 biome IDs, ordered by x then z then y, in 4×4×4 blocks. Possibly something else. Not present if full chunk is false.
Size VarInt Size of Data in bytes
Data Byte array See data structure in Chunk Format
Number of block entities VarInt Number of elements in the following array
Block entities Array of NBT Tag All block entities in the chunk. Use the x, y, and z tags in the NBT to determine their positions.

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

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

Update Light

Updates light levels for a chunk.

Packet ID State Bound To Field Name Field Type Notes
0x25 0x23 Play Client Chunk X VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Trust Edges Boolean If edges should be trusted for light updates.
Sky Light Mask VarInt Mask containing 18 bits, with the lowest bit corresponding to chunk section -1 (in the void, y=-16 to y=-1) and the highest bit for chunk section 16 (above the world, y=256 to y=271)
Block Light Mask VarInt Mask containing 18 bits, with the same order as sky light
Empty Sky Light Mask VarInt Mask containing 18 bits, which indicates sections that have 0 for all their sky light values. If a section is set in both this mask and the main sky light mask, it is ignored for this mask and it is included in the sky light arrays (the notchian server does not create such masks). If it is only set in this mask, it is not included in the sky light arrays.
Empty Block Light Mask VarInt Mask containing 18 bits, which indicates sections that have 0 for all their block light values. If a section is set in both this mask and the main block light mask, it is ignored for this mask and it is included in the block light arrays (the notchian server does not create such masks). If it is only set in this mask, it is not included in the block light arrays.
Sky Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Sky Light array Array of 2048 bytes There is 1 array for each bit set to true in the sky light mask, starting with the lowest value. Half a byte per light value.
Block Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Block Light array Array of 2048 bytes There is 1 array for each bit set to true in the block light mask, starting with the lowest value. Half a byte per light value.

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

Join Game

See Protocol Encryption for information on logging in.

Packet ID State Bound To Field Name Field Type Notes
0x26 0x24 Play Client Entity ID Int The player's Entity ID (EID)
Is hardcore Boolean
Gamemode Unsigned Byte 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. Bit 3 (0x8) is the hardcore flag.
Previous Gamemode Unsigned Byte 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. (More information needed)
World Count VarInt Size of the following array
World Names Array of Identifier Identifiers for all worlds on the server
Dimension Codec NBT Tag Compound This CompoundTag contains a ListTag named "dimension". The ListTag should contain CompoundTags with named StringTags "key" and "element". The full extent of these is still unknown, but the tag represents a dimension registry. See below for the vanilla default.
Dimension Int Enum Identifier -1: The Nether, 0: The Overworld, 1: The End Valid dimensions are defined per dimension registry sent before this
World Name Identifier Name of the world being spawned into
Hashed seed Long First 8 bytes of the SHA-256 hash of the world's seed.
Max Players Unsigned Byte Was once used by the client to draw the player list, but now is ignored
Level Type String Enum (16) default, flat, largeBiomes, amplified, customized, buffet, default_1_1
View Distance VarInt Render distance (2-32)
Reduced Debug Info Boolean If true, a Notchian client shows reduced information on the debug screen. For servers in development, this should almost always be false.
Enable respawn screen Boolean Set to false when the doImmediateRespawn gamerule is true
Is Debug Boolean True if the world is a debug mode world; debug mode worlds cannot be modified and have predefined blocks
Is Flat Boolean True if the world is a superflat world; flat worlds have different void fog and a horizon at y=0 instead of y=63

Example of Dimension codec CompoundTag sent by the server:

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

Known attributes :

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

Unlock Recipes

Packet ID State Bound To Field Name Field Type Notes
0x37 0x35 Play Client
Action VarInt 0: init, 1: add, 2: remove
Crafting Recipe Book Open Boolean If true, then the crafting recipe book will be open when the player opens its inventory.
Crafting Recipe Book Filter Active Boolean If true, then the filtering option is active when the players opens its inventory.
Smelting Recipe Book Open Boolean If true, then the smelting recipe book will be open when the player opens its inventory.
Smelting Recipe Book Filter Active Boolean If true, then the filtering option is active when the players opens its inventory.
Blast Furance Recipe Book Open Boolean If true, then the blast furnace recipe book will be open when the player opens its inventory.
Blast Furance Recipe Book Filter Active Boolean If true, then the filtering option is active when the players opens its inventory.
Smoker Recipe Book Open Boolean If true, then the smoker recipe book will be open when the player opens its inventory.
Smoker Recipe Book Filter Active Boolean If true, then the filtering option is active when the players opens its inventory.
Array size 1 VarInt Number of elements in the following array
Recipe IDs Array of Identifier
Array size 2 Optional VarInt Number of elements in the following array, only present if mode is 0 (init)
Recipe IDs Optional Array of Identifier, only present if mode is 0 (init)

Action:

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

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 Identifier -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)
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

Huh.png The following information needs to be added to this page:
May have changed in 20w27a
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 578 738)
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.