Matthiesen Lib
Matthiesen Lib is a lightweight Architectury-style library that enables mod developers to write shared code that works seamlessly across both Fabric and NeoForge mod loaders for Minecraft 1.21.1. Instead of maintaining separate implementations for each platform, you can write your mod logic once in common code and let Matthiesen Lib handle the platform-specific details.
Note: For regular users, This library does nothing on its own - it's a developer tool. If a mod requires Matthiesen Lib, simply drop it in your
modsfolder alongside the mod that needs it.
Docs
Documentation for the library can be found at mods.matthiesen.dev
Dependencies
- Matthiesen Lib API - The core API mod that provides the shared code and functionality for mod developers to use in their mods.
Optional Dependencies
- Ember's Text API - Use fancy text effects anywhere, including custom fonts!
Version Compatibility
| Minecraft Version | Library Version |
|---|---|
| 1.21.1 | 1.x.x |
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.1
- 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.
- Ships as matthiesen-lib-neoforge-1.12.0.jar — drop this file into the mods folder
- Download size: 123 KB
- Download link checked 29 Aug 2026 — working
These come from our own check of the pack file, not from the source page.