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BlueLibMinecraft mod for 1.21.5

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 1.21.5UtilityMobsGame MechanicsStorage
Latest version
neoforge-2.4.3
Minecraft
1.21 to 1.21.5
Java
Java 21+
Loaders
NeoForge, Fabric
Licence
MIT
Downloads
17.9k
Updated
9 mo ago
Available on
Modrinth
Space NodeOur hosting

Host BlueLib servers

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

  • 1.21.5
  • NeoForge
  • Fabric
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

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

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.5NeoForge, Fabric21+declared25 Mar 2025
1.21.4Fabric, NeoForge21+declared3 Dec 2024
1.21.3Fabric, NeoForge21+declared23 Oct 2024
1.21.2Fabric, NeoForge21+declared22 Oct 2024
1.21.1NeoForge, Fabric21+declared8 Aug 2024
1.21Fabric, NeoForge21+declared13 Jun 2024

Download

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

All 52 releases
neoforge-2.4.3release4 Jan 2026

2.4.3-neoforge-1.21.1-bluelib-2.4.3.jar · 1.0 MB · for 1.21.3, 1.21.2, 1.21.1

Download latest
59a29756b4d6…
Older versions24
  • fabric-2.4.34 Jan 20261.21.3, 1.21.2, 1.21.11.0 MB5.5k downloadseac0b5700fad…Get
  • neoforge-2.4.230 Dec 20251.21.3, 1.21.2, 1.21.11.0 MB111 downloads7a5b73b2465d…Get
  • fabric-2.4.230 Dec 20251.21.3, 1.21.2, 1.21.11.0 MB199 downloads51a46ae7a126…Get
  • neoforge-2.4.130 Dec 20251.21.3, 1.21.2, 1.21.11.0 MB36 downloads979d7fc63f28…Get
  • fabric-2.4.130 Dec 20251.21.3, 1.21.2, 1.21.11.0 MB60 downloads1e107bf63ee0…Get
  • fabric-2.4.028 Nov 20251.21.3, 1.21.2, 1.21.11.0 MB645 downloads521edcc200c7…Get
  • neoforge-2.4.028 Nov 20251.21.3, 1.21.2, 1.21.11.0 MB351 downloadscfc9092da5a6…Get
  • fabric-2.3.823 Sept 20251.21.3, 1.21.2, 1.21.11.0 MB1.1k downloads4a3d76d47b7a…Get
  • neoforge-2.3.823 Sept 20251.21.3, 1.21.2, 1.21.11.0 MB635 downloadsdb24c6e8e39d…Get
  • fabric-2.3.711 Sept 20251.21.3, 1.21.2, 1.21.11.0 MB352 downloads6cab0e4c081d…Get
  • neoforge-2.3.711 Sept 20251.21.3, 1.21.2, 1.21.11.0 MB203 downloadscdea6f219528…Get
  • fabric-2.3.629 Aug 20251.21.3, 1.21.2, 1.21.11.0 MB253 downloads8762d3eb17d4…Get
  • neoforge-2.3.629 Aug 20251.21.3, 1.21.2, 1.21.10.9 MB190 downloads651a0d71aa3d…Get
  • fabric-2.3.528 Aug 20251.21.3, 1.21.2, 1.21.11.0 MB62 downloads656333784723…Get
  • neoforge-2.3.528 Aug 20251.21.3, 1.21.2, 1.21.10.9 MB63 downloads05413367ed8c…Get
  • fabric-2.3.427 Aug 20251.21.3, 1.21.2, 1.21.11.0 MB90 downloads2d997eecba22…Get
  • neoforge-2.3.427 Aug 20251.21.3, 1.21.2, 1.21.10.9 MB72 downloadsc94c6afc1644…Get
  • fabric-2.3.3.626 Aug 20251.21.3, 1.21.2, 1.21.11.0 MB62 downloadsc2b35c7052d0…Get
  • neoforge-2.3.3.626 Aug 20251.21.3, 1.21.2, 1.21.10.9 MB72 downloads848103703fca…Get
  • fabric-2.3.3.525 Aug 20251.21.3, 1.21.2, 1.21.11.0 MB85 downloads9336c0de82c1…Get
  • neoforge-2.3.3.525 Aug 20251.21.3, 1.21.2, 1.21.10.9 MB65 downloads69b09887cb39…Get
  • fabric-2.3.3.424 Aug 20251.21.3, 1.21.2, 1.21.11.0 MB62 downloads0f9a2c1c4542…Get
  • neoforge-2.3.3.424 Aug 20251.21.3, 1.21.2, 1.21.10.9 MB52 downloads8bac7be6e506…Get
  • fabric-2.3.3.323 Aug 20251.21.3, 1.21.2, 1.21.11.0 MB43 downloads2e1aca52b685…Get

Frequently asked

Does BlueLib work on Minecraft 1.21.5?

Yes. 1.21.5 is the newest Minecraft version BlueLib 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 support?

Everything the author has declared, from 1.21 up to 1.21.5. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install BlueLib 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 support?

NeoForge, Fabric. 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?

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 BlueLib 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?

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 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.

Armor HiderHide or adjust the transparency of armor, glint, and offhand items - with full multiplayer sync. No dependencies required.GeckoLibA 3D animation library for entities, blocks, items, armor, and more!Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftJourneyMapReal-time map used for mapping in-game or your browser as you explore.Architectury 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+)

Details from Modrinth, where the author last updated it on 4 Jan 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? .