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BlueLib CommonMinecraft mod for 1.21.3

BlueLib is a Minecraft modding library designed to handle a wide range of modding tasks. It includes systems for simplifying code development, with support for data packs and resource packs. The goal is to make modding more accessible!

client and servernewest supported release 1.21.3UtilityMobsGame MechanicsStorage
Latest version
2.4.3
Minecraft
1.21 to 1.21.3
Java
Java 21+
Loaders
Fabric, NeoForge, Forge
Licence
MIT
Downloads
1.5k
Updated
10 mo ago
Available on
Modrinth
Space NodeOur hosting

Host BlueLib Common servers

One click and BlueLib Common is installed with the right loader, on hardware built for it.

  • 1.21.3
  • Fabric
  • NeoForge
  • Forge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

Every version BlueLib Common declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.3Fabric, NeoForge, Forge21+declared23 Oct 2024
1.21.2Fabric, Forge, NeoForge21+declared22 Oct 2024
1.21.1Fabric, Forge, NeoForge21+declared8 Aug 2024
1.21Fabric, NeoForge, Forge21+declared13 Jun 2024

Download

From BlueLib Common’s own host. Nothing is re-hosted here.

For Minecraft 1.21.3

Choose the loader you use before downloading.

Most recently published release

2.4.3release4 Jan 2026

2.4.3-common-1.21.1-bluelib-2.4.3.jar · 0.9 MB · for 1.21.3, 1.21.2, 1.21.1 · Forge, NeoForge

Choose file on publisher ↗
f729b5a0b812…
Older versions22

Frequently asked

Does BlueLib Common work on Minecraft 1.21.3?

Yes. 1.21.3 is the newest Minecraft version BlueLib Common declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does BlueLib Common support?

Everything the author has declared, from 1.21 up to 1.21.3. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install BlueLib Common 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 BlueLib Common support?

Fabric, NeoForge, Forge. 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 BlueLib Common?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

What licence is BlueLib Common 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 BlueLib Common?

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 BlueLib Common 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. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

Works on the same versions

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

Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftArchitectury APIAn intermediary api aimed to ease developing multiplatform mods.Jade 🔍Shows information about what you are looking at. (Hwyla/WAILA fork for Minecraft 1.16+)Collective🎓 Collective is a shared library with common code for all of Serilum's mods.AttributeFixRemoves arbitrary limits on Minecraft's attribute system.sparkspark is a performance profiler for Minecraft clients, servers and proxies.

Details from Modrinth, where the author last updated it on 4 Jan 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .