ModsJava
JMX
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.
JSON Model Extensions
JMX adds support for FREX Rendering API features to Minecraft JSON model loading. It can also be configured to load all JSON models as FREX meshes, which may offer a modest reduction in memory usage due to more efficient data structures.
Current Features
- Backwards compatibility with Vanilla model JSONs
- Alternate texture definitions for each face
- Up to two sprite layers per face
- Material specification to control lighting, render layer
- Material inheritance, similar to other JSON model inheritance
- Support for separate definition for FREX renderers (useful for shaders)
- FREX definitions can reference shaders loaded via FREX JSON material loader
See the JMX Wiki for more information.
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.20, 1.20.1
- 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 jmx-fabric-20.0.281.jar — drop this file into the mods folder
- Download size: 811 KB
- Download link checked 30 Aug 2026 — working
These come from our own check of the pack file, not from the source page.