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Matthiesen Lib APIMinecraft mod for 1.21.1

The Server-side API for Matthiesen Lib, providing utilities and features for mod developers using the library

server onlynewest supported 1.21.1UtilityLibrary
Latest version
1.12.0
Minecraft
1.21.1
Loaders
Fabric, NeoForge
Licence
MIT
Downloads
11.1k
Updated
2 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Matthiesen Lib API servers

One click and Matthiesen Lib API is installed with the right loader, on hardware built for it.

  • 1.21.1
  • Fabric
  • NeoForge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

Every version Matthiesen Lib API declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1Fabric, NeoForge21+declared8 Aug 2024

Download

From Matthiesen Lib API’s own host. Nothing is re-hosted here.

All 30 releases
1.12.0release18 Jul 2026

matthiesen-lib-api-neoforge-1.12.0.jar · 0.2 MB · for 1.21.1

Download latest
ba5d1f3c4a46…
Older versions24
  • 1.11.312 Jul 20261.21.10.2 MB412 downloads9eaba7fc4470…Get
  • 1.11.29 Jul 20261.21.10.2 MB148 downloads8f70696a077c…Get
  • 1.11.18 Jul 20261.21.10.2 MB15 downloads19a4aef2c2ed…Get
  • 1.11.05 Jul 20261.21.10.2 MB325 downloads5913e9f9603d…Get
  • 1.10.44 Jul 20261.21.10.2 MB31 downloadsc64f73421818…Get
  • 1.10.33 Jul 20261.21.10.2 MB1 download8941a0db8ea0…Get
  • 1.10.23 Jul 20261.21.10.2 MB2 downloads27740b3c2271…Get
  • 1.10.13 Jul 20261.21.10.2 MB5 downloads4c775fd1e1fa…Get
  • 1.10.030 Jun 20261.21.10.2 MB230 downloadsffb52fc15c5c…Get
  • 1.9.228 Jun 20261.21.10.2 MB138 downloadsb42301e2afd3…Get
  • 1.9.124 Jun 20261.21.10.2 MB309 downloadsefab88d0648b…Get
  • 1.9.024 Jun 20261.21.10.2 MB21 downloadsa9400d7d6ba9…Get
  • 1.8.019 Jun 20261.21.10.2 MB565 downloads0cf312cf00bd…Get
  • 1.7.115 Jun 20261.21.10.2 MB49 downloads00e83355aced…Get
  • 1.7.015 Jun 20261.21.10.2 MB348 downloads5b1e09216fe8…Get
  • 1.6.213 Jun 20261.21.10.2 MB108 downloads74f7b9365911…Get
  • 1.6.112 Jun 20261.21.10.2 MB263 downloadsb06bffa8ac72…Get
  • 1.6.011 Jun 20261.21.10.2 MB19 downloads05ab10158b6a…Get
  • 1.5.89 Jun 20261.21.10.1 MB35 downloads4c823d0f443e…Get
  • 1.5.78 Jun 20261.21.10.1 MB237 downloadse68ce66aa4c6…Get
  • 1.5.68 Jun 20261.21.10.2 MB17 downloads2561b2e22229…Get
  • 1.5.56 Jun 20261.21.10.2 MB83 downloads73aee25660e1…Get
  • 1.5.45 Jun 20261.21.10.2 MB18 downloads44b4ebb1f082…Get
  • 1.5.35 Jun 20261.21.10.1 MB12 downloads6632bf573f8b…Get

Frequently asked

Does Matthiesen Lib API work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Matthiesen Lib API declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Do I need to install Matthiesen Lib API on the client or the server?

The server only. Players join with an ordinary Minecraft client and install nothing.

Which platform or loader does Matthiesen Lib API support?

Fabric, NeoForge. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Matthiesen Lib API?

On the newest Minecraft version it supports, Java 21 or newer. The requirement comes from the Minecraft version you run rather than from the mod itself, so on an older supported Minecraft the answer is that version's Java, not this one.

What licence is Matthiesen Lib API under?

MIT, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Matthiesen Lib API?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download Matthiesen Lib API safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. The download link goes to the source recorded for that release; verify the publisher, filename and checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

Details from Modrinth, where the author last updated it on 18 Jul 2026. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .