KubeJS Library (1.21.11, 1.20.1) – Customize Modpack or Server with JavaScript
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April 13, 2026
LatvianModder
KubeJS Library lets you create scripts in JavaScript language to manage your server. This mod adds new blocks and items, change recipes, add custom handlers for quest mods and more.
How to use:
- Run the game with mod installed once. It should generate kubejs folder in your minecraft directory with example scripts. startup scripts only get run once when the game loads. Those are for registering items, setting up configs etc. Server/data scripts are loaded when you join a world, those are better for things like clearlag, displaying custom login messages and world/player related things in general.
- You can use /reload. Note: Not everything is reloadable. Some things require you to restart game, some only world, some work on fly.
How to Install:
New to Minecraft? Follow our step-by-step guide to install Mods on your PC.View Guide
Requirements:
KubeJS Library Download Links
For Minecraft
1.21.11,
1.21.10,
1.21.9
All Versions Covered
1.21.11
1.21.10
1.21.9
1.21.8
1.21.7
1.21.6
1.21.5
1.21.4
1.21.1
1.21
All Versions Covered
1.21.11
1.21.10
1.21.9
1.21.8
1.21.7
1.21.6
1.21.5
1.21.4
1.21.1
1.21
For Minecraft 1.20.4
For Minecraft 1.20.1, 1.20
For Minecraft 1.19.2
For Minecraft 1.19
For Minecraft 1.18.2
For Minecraft 1.18.1
For Minecraft 1.17.1
For Minecraft 1.16.5
For Minecraft 1.15.2, 1.15.1
For Minecraft 1.14.4
For Minecraft 1.12.2
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