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Matthiesen LibMinecraft mod for 1.21.1

A lightweight Architectury-style library for shared mod code across Fabric and NeoForge.

client and servernewest supported 1.21.1UtilityLibrary
Latest version
1.12.0
Minecraft
1.21.1
Java
Java 21+
Loaders
Fabric, NeoForge
Licence
MIT
Downloads
10.0k
Updated
2 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Matthiesen Lib servers

One click and Matthiesen Lib 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 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’s own host. Nothing is re-hosted here.

All 30 releases
1.12.0release18 Jul 2026

matthiesen-lib-neoforge-1.12.0.jar · 0.1 MB · for 1.21.1

Download latest
e6de44558641…
Older versions24
  • 1.11.312 Jul 20261.21.10.1 MB362 downloads79f2f32d1761…Get
  • 1.11.29 Jul 20261.21.10.1 MB91 downloads47e92bc874d2…Get
  • 1.11.18 Jul 20261.21.10.1 MB18 downloads579bc568fa5c…Get
  • 1.11.05 Jul 20261.21.10.1 MB277 downloads1d76ee5f8ce7…Get
  • 1.10.44 Jul 20261.21.10.1 MB37 downloads26545ee4f6a7…Get
  • 1.10.33 Jul 20261.21.10.1 MB19 downloadsed25bd47be1e…Get
  • 1.10.23 Jul 20261.21.10.1 MB6 downloadse52133594a41…Get
  • 1.10.13 Jul 20261.21.10.1 MB5 downloadsf2ac24e41513…Get
  • 1.10.030 Jun 20261.21.188 KB63 downloadsbaf0fb217c72…Get
  • 1.9.228 Jun 20261.21.181 KB132 downloads6ab38868094f…Get
  • 1.9.124 Jun 20261.21.178 KB66 downloads9772e1166644…Get
  • 1.9.024 Jun 20261.21.181 KB5 downloads0735ee1529e2…Get
  • 1.8.019 Jun 20261.21.180 KB546 downloads268d0e7abdc1…Get
  • 1.7.115 Jun 20261.21.178 KB45 downloads75e99f630430…Get
  • 1.7.015 Jun 20261.21.178 KB28 downloads202bce4f142d…Get
  • 1.6.213 Jun 20261.21.178 KB44 downloadsd30fbda6bf03…Get
  • 1.6.112 Jun 20261.21.178 KB78 downloads60c5cd9dd119…Get
  • 1.6.011 Jun 20261.21.178 KB19 downloads1888ede5b8ee…Get
  • 1.5.89 Jun 20261.21.180 KB224 downloads95031fa9cab7…Get
  • 1.5.78 Jun 20261.21.180 KB190 downloads63716e08adbe…Get
  • 1.5.68 Jun 20261.21.180 KB20 downloads450b7fd9fe41…Get
  • 1.5.56 Jun 20261.21.180 KB75 downloads09323d34ee79…Get
  • 1.5.45 Jun 20261.21.178 KB9 downloads7b6d8d6f57c2…Get
  • 1.5.35 Jun 20261.21.178 KB12 downloads7202a5f4171a…Get

Frequently asked

Does Matthiesen Lib work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Matthiesen Lib 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 on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does Matthiesen Lib 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?

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 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?

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 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.

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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? .