/publish

Opens a single-player world to the local network (LAN), allowing other players on the same network to join.

Syntax

/publish [<allowCommands>] [<gamemode>] [<port>]

Name	Required	Description
allowCommands	No	Whether to allow cheats/commands for other players joining (true or false).
gamemode	No	The default game mode for joining players (survival, creative, adventure, spectator).
port	No	The port to host on. A random available port is chosen if omitted.

/publish
/publish true creative
/publish false survival 25565

Requires permission level 4.
Singleplayer only — not available on dedicated servers.
The world remains open to LAN until the host quits the world.
This is equivalent to using the "Open to LAN" option from the Escape menu, but with more control over settings.
While the world is open to LAN, the game does not pause when the menu is opened.

This command is not usable from command blocks. It is a singleplayer-only command.