Minecraft:Java Edition protocol/Packets - Revision history

SyncBot: Sync: updated from Minecraft

2026-05-19T11:10:44Z

Sync: updated from Minecraft

← Older revision		Revision as of 11:10, 19 May 2026
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	Clicking in the creative inventory menu is quite different from non-creative inventory management. Picking up an item with the mouse actually deletes the item from the server, and placing an item into a slot or dropping it out of the inventory actually tells the server to create the item from scratch. (This can be verified by clicking an item that you don't mind deleting, then severing the connection to the server; the item will be nowhere to be found when you log back in.) As a result of this implementation strategy, the "Destroy Item" slot is just a client-side implementation detail that means "I don't intend to recreate this item.". Additionally, the long listings of items (by category, etc.) are a client-side interface for choosing which item to create. Picking up an item from such listings sends no packets to the server; only when you put it somewhere does it tell the server to create the item in that location.		Clicking in the creative inventory menu is quite different from non-creative inventory management. Picking up an item with the mouse actually deletes the item from the server, and placing an item into a slot or dropping it out of the inventory actually tells the server to create the item from scratch. (This can be verified by clicking an item that you don't mind deleting, then severing the connection to the server; the item will be nowhere to be found when you log back in.) As a result of this implementation strategy, the "Destroy Item" slot is just a client-side implementation detail that means "I don't intend to recreate this item.". Additionally, the long listings of items (by category, etc.) are a client-side interface for choosing which item to create. Picking up an item from such listings sends no packets to the server; only when you put it somewhere does it tell the server to create the item in that location.

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

	{\| class="wikitable"		{\| class="wikitable"

SyncBot: Sync: updated from Minecraft

2026-05-13T11:09:28Z

Sync: updated from Minecraft

← Older revision		Revision as of 11:09, 13 May 2026
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	\| Simulation Distance		\| Simulation Distance
	\| {{Type\|VarInt}}		\| {{Type\|VarInt}}
	\| ~~The~~ distance ~~that the client will process specific things, such as entities~~.		\| Server simulation distance. See [[#Set Simulation Distance\|Set Simulation Distance]].
	\|-		\|-
	\| Reduced Debug Info		\| Reduced Debug Info
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	\| Simulation Distance		\| Simulation Distance
	\| {{Type\|VarInt}}		\| {{Type\|VarInt}}
	\| ~~The~~ distance ~~that the client will process specific things, such as entities~~.		\| Server simulation distance.
	\|}		\|}

			The server simulation distance is used by the vanilla client only to determine whether the death animation of an entity should progress. If the integer [[Minecraft:w:chessboard distance\|chessboard distance]] between the chunk the local player is in (not the chunk cache center) and the chunk the entity is in is greater than the simulation distance, the animation will be paused.

	==== Set Subtitle Text ====		==== Set Subtitle Text ====

SyncBot: Sync: updated from Minecraft

2026-05-01T11:17:55Z

Sync: updated from Minecraft

← Older revision		Revision as of 11:17, 1 May 2026
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	! Notes		! Notes
	\|-		\|-
	\| rowspan="2"\| ''protocol:''<br/><code>~~0x01~~</code><br/><br/>''resource:''<br/><code>hello</code>		\| rowspan="2"\| ''protocol:''<br/><code>0x00</code><br/><br/>''resource:''<br/><code>hello</code>
	\| rowspan="2"\| Login		\| rowspan="2"\| Login
	\| rowspan="2"\| Server		\| rowspan="2"\| Server
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	! Notes		! Notes
	\|-		\|-
	\| rowspan="2"\| ''protocol:''<br/><code>~~0x02~~</code><br/><br/>''resource:''<br/><code>key</code>		\| rowspan="2"\| ''protocol:''<br/><code>0x01</code><br/><br/>''resource:''<br/><code>key</code>
	\| rowspan="2"\| Login		\| rowspan="2"\| Login
	\| rowspan="2"\| Server		\| rowspan="2"\| Server
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	! Notes		! Notes
	\|-		\|-
	\| rowspan="2"\| ''protocol:''<br/><code>~~0x03~~</code><br/><br/>''resource:''<br/><code>custom_query_answer</code>		\| rowspan="2"\| ''protocol:''<br/><code>0x02</code><br/><br/>''resource:''<br/><code>custom_query_answer</code>
	\| rowspan="2"\| Login		\| rowspan="2"\| Login
	\| rowspan="2"\| Server		\| rowspan="2"\| Server
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	! Notes		! Notes
	\|-		\|-
	\| ''protocol:''<br/><code>~~0x04~~</code><br/><br/>''resource:''<br/><code>login_acknowledged</code>		\| ''protocol:''<br/><code>0x03</code><br/><br/>''resource:''<br/><code>login_acknowledged</code>
	\| Login		\| Login
	\| Server		\| Server

SyncBot: Sync: updated from Minecraft

2026-04-30T11:10:10Z

Sync: updated from Minecraft

← Older revision		Revision as of 11:10, 30 April 2026
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	! Notes		! Notes
	\|-		\|-
	\| rowspan="2"\| ''protocol:''<br/><code>~~0x00~~</code><br/><br/>''resource:''<br/><code>hello</code>		\| rowspan="2"\| ''protocol:''<br/><code>0x01</code><br/><br/>''resource:''<br/><code>hello</code>
	\| rowspan="2"\| Login		\| rowspan="2"\| Login
	\| rowspan="2"\| Server		\| rowspan="2"\| Server
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	! Notes		! Notes
	\|-		\|-
	\| rowspan="2"\| ''protocol:''<br/><code>~~0x01~~</code><br/><br/>''resource:''<br/><code>key</code>		\| rowspan="2"\| ''protocol:''<br/><code>0x02</code><br/><br/>''resource:''<br/><code>key</code>
	\| rowspan="2"\| Login		\| rowspan="2"\| Login
	\| rowspan="2"\| Server		\| rowspan="2"\| Server
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	! Notes		! Notes
	\|-		\|-
	\| rowspan="2"\| ''protocol:''<br/><code>~~0x02~~</code><br/><br/>''resource:''<br/><code>custom_query_answer</code>		\| rowspan="2"\| ''protocol:''<br/><code>0x03</code><br/><br/>''resource:''<br/><code>custom_query_answer</code>
	\| rowspan="2"\| Login		\| rowspan="2"\| Login
	\| rowspan="2"\| Server		\| rowspan="2"\| Server
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	! Notes		! Notes
	\|-		\|-
	\| ''protocol:''<br/><code>~~0x03~~</code><br/><br/>''resource:''<br/><code>login_acknowledged</code>		\| ''protocol:''<br/><code>0x04</code><br/><br/>''resource:''<br/><code>login_acknowledged</code>
	\| Login		\| Login
	\| Server		\| Server

SyncBot: Sync: updated from Minecraft

2026-04-23T11:18:02Z

Sync: updated from Minecraft

← Older revision		Revision as of 11:18, 23 April 2026
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	! Notes		! Notes
	\|-		\|-
	\| ''protocol:''<br/><code>~~0x2C~~</code><br/><br/>''resource:''<br/><code>keep_alive</code>		\| ''protocol:''<br/><code>0x2B</code><br/><br/>''resource:''<br/><code>keep_alive</code>
	\| Play		\| Play
	\| Client		\| Client
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	! Notes		! Notes
	\|-		\|-
	\| rowspan="9"\| ''protocol:''<br/><code>~~0x2D~~</code><br/><br/>''resource:''<br/><code>level_chunk_with_light</code>		\| rowspan="9"\| ''protocol:''<br/><code>0x2C</code><br/><br/>''resource:''<br/><code>level_chunk_with_light</code>
	\| rowspan="9"\| Play		\| rowspan="9"\| Play
	\| rowspan="9"\| Client		\| rowspan="9"\| Client

SyncBot: Sync: updated from Minecraft

2026-04-22T11:16:24Z

Sync: updated from Minecraft

← Older revision		Revision as of 11:16, 22 April 2026
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	! Notes		! Notes
	\|-		\|-
	\| ''protocol:''<br/><code>~~0x2B~~</code><br/><br/>''resource:''<br/><code>keep_alive</code>		\| ''protocol:''<br/><code>0x2C</code><br/><br/>''resource:''<br/><code>keep_alive</code>
	\| Play		\| Play
	\| Client		\| Client
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	! Notes		! Notes
	\|-		\|-
	\| rowspan="9"\| ''protocol:''<br/><code>~~0x2C~~</code><br/><br/>''resource:''<br/><code>level_chunk_with_light</code>		\| rowspan="9"\| ''protocol:''<br/><code>0x2D</code><br/><br/>''resource:''<br/><code>level_chunk_with_light</code>
	\| rowspan="9"\| Play		\| rowspan="9"\| Play
	\| rowspan="9"\| Client		\| rowspan="9"\| Client

SyncBot: Sync: new page from Minecraft

2026-04-16T11:13:53Z

Sync: new page from Minecraft

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