Java Edition protocol/Development version

This page documents the changes from release 1.21.8 (protocol 772) to the current release (1.21.10, protocol 773). The stable protocol documentation is currently lagging behind, and the changes documented here will be merged soon, once they are complete.

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

Contents

ID Packet name Documentation
Configuration clientbound
0x13 Code of Conduct Pre
Configuration serverbound
0x09 Accept Code of Conduct Pre
Play clientbound
0x01 Spawn Entity Current Pre
0x1A Debug Block Value Pre
0x1B Debug Chunk Value Pre
0x1C Debug Entity Value Pre
0x1D Debug Event Pre
0x24 Explosion Current Pre
0x27 Game Test Highlight Position Pre
0x47 Player Rotation Current Pre
0x5f Set Default Spawn Position Current Pre
0x63 Set Entity Velocity Current Pre
Play serverbound
0x16 Debug Sample Subscription Current
0x16 Debug Subscription Request Pre

Data types

These have already been added to the main article.

Configuration

Clientbound

Code of Conduct
Packet ID State Bound To Field Name Field Type Notes
protocol:
0x13

resource:
code_of_conduct 		Play Client

Serverbound

Accept Code of Conduct
Packet ID State Bound To Field Name Field Type Notes
protocol:
0x09

resource:
accept_code_of_conduct 		Configuration Server no fields

Play

Clientbound

Debug Block Value
Packet ID State Bound To Field Name Field Type Notes
protocol:
0x1A

resource:
debug_block_value 		Play Client Location Position
Update Debug Subscription Update
Debug Chunk Value
Packet ID State Bound To Field Name Field Type Notes
protocol:
0x1B

resource:
debug_chunk_value 		Play Client Chunk Z Int
Chunk X Int
Update Debug Subscription Update

Note: The order of X and Z is inverted, because the client reads them as one big-endian Long, with Z being the upper 32 bits.

Debug Entity Value
Packet ID State Bound To Field Name Field Type Notes
protocol:
0x1C

resource:
debug_entity_value 		Play Client Entity ID VarInt
Update Debug Subscription Update
Debug Event
Packet ID State Bound To Field Name Field Type Notes
protocol:
0x1D

resource:
debug_event 		Play Client Event Debug Subscription Event
Game Test Highlight Position
Packet ID State Bound To Field Name Field Type Notes
protocol:
0x27

resource:
game_test_highlight_pos 		Play Client Absolute Location Position
Relative Location Position

Serverbound

Debug Subscription Request

Sent by the client whenever debug subscriptions, used by debug graphs and renderers, are activated or deactivated. The list in the packet replaces the previous set of active subscriptions. Subscriptions not in the list are deactivated.

If the client does not have permission to receive the requested debug information, the subscriptions are nonetheless retained by the server, and it is not necessary to send this packet again if the permissions change.

Packet ID State Bound To Field Name Field Type Notes
protocol:
0x16

resource:
debug_subscription_request 		Play Server Subscriptions Prefixed Array of VarInt List of active debug subscriptions. IDs in the minecraft:debug_subscription registry.
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