How do I install GraalJS?

Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. Download the .jar. Put it in the .minecraft/mods folder and launch that loader profile. Opens on Modrinth — not every file is mirrored on our own servers.

What Minecraft version does GraalJS work with?

The listing gives Minecraft 26.1.1, 26.1.2, 26.2. This is the version stated by the author or source site, not something we verified ourselves.

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GraalJS

by anmao · on Modrinth

Which build do you need?

This mod ships a separate file for every mod loader and every version of the game. Pick both, then download — the wrong build installs fine and then does nothing in the game.

Mod loader

Mod loader NeoForge2 builds
Mod loader Forge3 builds

Minecraft version

Minecraft 26.1.1–26.2Newest
Minecraft 1.21.1–1.21.6

Minecraft 26.1.1–26.1.2Newest
Minecraft 1.21.1–1.21.6
Minecraft 1.20.1–1.20.6

⬇ Download for 26.1.1–26.2 · NeoForge ⬇ Download for 1.21.1–1.21.6 · NeoForge ⬇ Download for 26.1.1–26.1.2 · Forge ⬇ Download for 1.21.1–1.21.6 · Forge ⬇ Download for 1.20.1–1.20.6 · Forge

I don't know my version or loader

Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.

No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.

Open in MC Java Mods Get it on Google Play →

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:

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft versions listed: 26.1.1, 26.1.2, 26.2
How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.

Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.

Verified by MCModsHub

Ships as graaljs-26.x-25.0.2-1-Neo-lite.jar — drop this file into the mods folder
Download size: 34.9 MB
Download link checked 5 Sept 2026 — working

These come from our own check of the pack file, not from the source page.

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