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Matthiesen Lib API

⚠️ This mod has been deprecated and is no longer going to receive updates. This library has been replaced by Matthiesen Core which provides a more robust and feature-rich foundation for mod developers to build upon.

FabricNeoForge
Loaders
FabricNeoForge
Downloads on Modrinth
71.4K
Followers on Modrinth
2
versions
76
Updated
July 18, 2026Jul 18
Published
in 2026
This is a library — other mods need it, and it adds nothing to the game by itselfRequired by 15 mods. Download it if another mod needs it.

At a glance

A library: other mods need it — required by 15 mods
Runs on Fabric and NeoForge
For Minecraft 1.21.1
Server only — players don't need to install it
Latest version — 1.12.0 from July 18, 2026
License MIT — free
Where it's needed
In gamenot neededOn serverrequired

Install on the server only; players don't need it

Game versions1.21.1

Matthiesen Lib API

⚠️ This mod has been deprecated and is no longer going to receive updates. This library has been replaced by Matthiesen Core which provides a more robust and feature-rich foundation for mod developers to build upon.

Matthiesen Lib API is the server-side API for Matthiesen Lib, 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 API, simply drop it in your mods folder alongside the mod that needs it.

Docs

Documentation for the library can be found at mods.matthiesen.dev

Version Compatibility

Minecraft VersionLibrary Version
1.21.11.x.x

FastStats Metrics

This library uses FastStats to collect anonymous usage statistics. This helps the developer understand how the library and the mods built using the library are being used and improve it over time. You can learn more about the data collected and how it is used by visiting FastStats: Information.

You can also view the data collected by this library on the FastStats: Matthiesen Lib API page.

To opt out of this data collection, set the enabled property to false in the <game_directory>/config/matthiesen_lib_api/metrics.properties file.

FAQ

How to install Matthiesen Lib API?

Install Fabric for your Minecraft version, download Matthiesen Lib API for the same version and loader, put the file into the mods folder and launch the game with the loader profile.

Which Minecraft versions does Matthiesen Lib API support?

Matthiesen Lib API has builds for Minecraft 1.21.1.

Is Matthiesen Lib API needed on the server?

Server only — players don't need to install it

License and source
MIT Licensefree to use and share with credit to the author
Original — Modrinth↗Files unchanged, verified with SHA-512Is this your mod? For rights holders

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