Dimension Locker

Locking is controlled by an admin command that marks a dimension as locked or open, and the change takes effect without rebooting the server. The mod is configurable through a gamerule that decides whether operators bypass locked dimensions, and that rule is set to true by default. A player who tries to pass through a locked portal is sent back and receives a feedback message that includes the dimension's name. Disabling the Nether or the End by default can be handled this way, and the mod is intended to work alongside other mods that add dimensions, though some language entries may still need a resource pack.

Exceptions are granted through custom items built on data components. A component can be added to an Ender Eye so that it lets a player enter a chosen dimension, such as the End, while the rest stay locked. Two further components prevent items from being stored in an Ender Chest and keep dropped items from despawning, which suits items that must survive. The data components can be used together or separately, depending on what a server needs.

The mod runs on both the server and each client, so the server and every player need it. Builds exist for Fabric, Forge, NeoForge and Quilt across the 1.19.2 and 1.21.3 – 1.21.4 game versions, and the code is open source under the MIT License.