CurseForge · Minecraft mod
WorldJS
KubeJS addon for changing world generation features
Quick answer
Which WorldJS release should I use?
worldjs-1.21.1-1.1.0.jar targets 1.21.1 with NeoForge. The project page does not say whether this file belongs on the client, dedicated server, or both. All 3 required mods have matching files.
Where it goes
Is WorldJS required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does worldjs-1.21.1-1.1.0.jar need?
worldjs-1.21.1-1.1.0.jar. Change the file and its required mods may change too.
Install KubeJS, Rhino, Better Advanced Tooltips first. We found matching files for this game-version and loader setup. 2 come through another mod in the chain.
2 extra mods were pulled in by other dependencies. Indented rows show who needs each one. We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add WorldJS without breaking your instance.
Built for worldjs-1.21.1-1.1.0.jar. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use worldjs-1.21.1-1.1.0.jar. It targets 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install KubeJS, Rhino, Better Advanced Tooltips first. We found matching files for this game-version and loader setup. 2 come through another mod in the chain.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside worldjs-1.21.1-1.1.0.jar. It opens that exact file at the source.
About this project
What does WorldJS add?
World generation integration for KubeJS. Allows for the addition of configured features, placed features, and biome modifiers using KubeJS's ServerEvents.registry
Supports:
- All vanilla configured feature types (+ a WorldJS custom type)
- All vanilla placement modifier types (+ placed features)
- All NeoForge biome modifiers
Additionally, support for other placement modifier types can be added with the provided PlacedFeatureModifierEvent
Example
ServerEvents.registry('worldgen/configured_feature', event => {
event.create('delta_feature', 'delta_feature')
.size([11, 15])
.rimSize([1, 3])
.rim('minecraft:calcite')
.contents('minecraft:lava')
.withPlacement('minecraft:delta', p => { // Overwrite the vanilla placed feature
p.modifiers(modifiers => {
let { minecraft } = modifiers
minecraft
.countOnEveryLayer(40)
.biome()
})
})
})

Project description from CurseForge.
Pick your setup
WorldJS by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.1
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
WorldJS versions and loaders
worldjs-1.21.1-1.1.0.jar
6 Sept 2026
worldjs-1.21.1-1.0.1.jar
12 Jul 2026
worldjs-1.21.1-1.0.0.jar
29 May 2026
Looking for an older file? The official CurseForge project page is in Resources.