
Modrinth · Minecraft mod
GraalJS
A JavaScript language library.
Quick answer
Which GraalJS release matches 1.21.6 Forge?
GraalJS 1.21.x-24.2.1-1-Forge targets 1.21.1, 1.21.2, 1.21.3 with Forge. Installation on the client is optional. Installation on the dedicated server is optional. No extra mods listed for this file.
Where it goes
Is GraalJS required on the client, server, or both?
Installation on the client is optional. Installation on the dedicated server is optional.
The source marks this as usable on both the client and server.
What else does GraalJS 1.21.x-24.2.1-1-Forge need?
1.21.x-24.2.1-1-Forge on 1.21.6 Forge. Every mod below is checked against that same setup.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add GraalJS without breaking your instance.
Built for GraalJS 1.21.x-24.2.1-1-Forge on 1.21.6 Forge. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 1.21.x-24.2.1-1-Forge. It targets 1.21.1, 1.21.2, 1.21.3 with Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
Installation on the client is optional. Installation on the dedicated server is optional.
- 04
Pick the file you checked
Use the “Get this file” button beside 1.21.x-24.2.1-1-Forge. It opens that exact file at the source.
About this project
What does GraalJS add?
This mod packages GraalJS to facilitate other mods using GraalJS without needing to package it separately.
Version number explanation: GraalJS-(Supported Minecraft version)-(GraalJS version)-(This mod version number)-(Mod loader identifier)-(Packaging type)
For example: GraalJS-1.21.x-24.2.1-1-Neo-lite
GraalJS: https://www.graalvm.org/javascript/
GraalJS Documentation: https://www.graalvm.org/reference-manual/js/
This project's GitHub: https://github.com/An-Mao/MC-GraalJS
----Attention----
· This is not an official GraalVM product. If you encounter non-code related issues, please contact me.
· When starting the game with a JDK that includes GraalJS (such as GraalVM), errors may occur. Please use the lite version in the attached files.
Any questions can be asked in github or contacted as below:
Project description from Modrinth.
Pick your setup
GraalJS by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
26.1.2
2 loader builds26.1.1
2 loader builds1.21.6
2 loader builds1.21.5
2 loader builds1.21.4
2 loader builds1.21.3
2 loader builds1.21.2
2 loader builds1.21.1
2 loader builds1.20.6
1 loader build1.20.5
1 loader build1.20.4
1 loader buildShowing the newest 12 of 15 game versions. Older files are in the list below.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
GraalJS versions and loaders
1.21.x-24.2.1-1-Forge
GraalJS-1.21.x-24.2.1-1-Forge-all.jar
20 Jun 2025
1.21.x-24.2.1-1-Forge
GraalJS-1.21.x-24.2.1-1-Forge-lite.jar
20 Jun 2025
Looking for an older file? The official Modrinth project page is in Resources.