How do I install BLib?

Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. Download the .jar. Put it in the .minecraft/mods folder and launch that loader profile. Opens on CurseForge — not every file is mirrored on our own servers.

What Minecraft version does BLib work with?

The listing gives Minecraft 1.21.1. This is the version stated by the author or source site, not something we verified ourselves.

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BLib

Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.

by bvanseg · on CurseForge

Which build do you need?

This mod ships a separate file for every mod loader and every version of the game. Pick both, then download — the wrong build installs fine and then does nothing in the game.

Mod loader

Mod loader Fabric1 build
Mod loader NeoForge1 build

Minecraft version

Minecraft 1.21.1Newest

Minecraft 1.21.1Newest

⬇ Download for 1.21.1 · Fabric ⬇ Download for 1.21.1 · NeoForge

I don't know my version or loader

Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.

No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.

Open in MC Java Mods Get it on Google Play →

A library that makes multi-loader mod development more streamlined.

Features:
- Unified API (write common code once, run on Fabric/NeoForge with minimal Fabric/NeoForge boilerplate)
- Block breaking progress management
- Custom decorated pot pattern registration
- Datafixing utilities (registry name migration)
- Custom loot item conditions for detecting loaded mods
- AzureLib/animation utilities
- Large-scale explosion utilities
- GOAP-based AI utilities
- Common tag API for items, blocks, etc.
- Custom stream codec implementation (independent of Mojang stream codecs)
- Custom data sync/persistence API (independent of Mojang data components)
- [Fabric] Automatic registration of spawn egg dispenser behaviors
- [NeoForge] Semi-automated datagen management

Note: This is a library mod for developers only, and as a result does not impact the base game if used by itself.

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft version listed: 1.21.1
How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.

Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.

File checked by MCModsHub

Ships as blib-fabric-1.21.1-0.2.2.jar — drop this file into the mods folder
Download size: 1.7 MB
Download link checked 2 Oct 2026 — working

These come from our own check of the pack file, not from the source page.

Explore more

All Mods for Java All Minecraft Java mods Java mods for 1.21