How do I install JustAnotherLibrary?

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 JustAnotherLibrary work with?

The listing gives Minecraft 1.21.11, 1.21.5, 1.21.4, among others. This is the version stated by the author or source site, not something we verified ourselves.

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JustAnotherLibrary

Java mod listed for Minecraft 1.20–1.21. Downloads from the MC Java Mods app on Android.

by ChristianButNot · 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 NeoForge4 builds
Mod loader Fabric1 build
Mod loader Forge1 build

Minecraft version

Minecraft 1.21.11Newest
Minecraft 1.21.5
Minecraft 1.21.4
Minecraft 1.21.1

Minecraft 1.21.4Newest

Minecraft 1.20.1Newest

⬇ Download for 1.21.11 · NeoForge ⬇ Download for 1.21.5 · NeoForge ⬇ Download for 1.21.4 · NeoForge ⬇ Download for 1.21.1 · NeoForge ⬇ Download for 1.21.4 · Fabric ⬇ Download for 1.20.1 · Forge

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 →

JustAnotherLibrary — Minecraft Java mod, screenshot 1

JustAnotherLibraryMod, is the foundation of almost every one of my mods and modpacks. Everything made by me requires this mod.
It currently adds custom item types, tool types, weapon types, all that can be accessed by using the library as a repository.
Contains custom Tool Levels, such as improved vanilla ones (Wood, Stone, Iron, Diamond, etc), custom ones, (Emerald, Quartz, Obsidian), and more (mainly surrounding my custom tools in all of my mods)
Contains Armor Materials for all of my mods, and more
Features a variety of tags that can be utilized for all of the custom item types
Paxels, Spears, Knives, Shears, and more weapon/tool types are implemented, all you'd have to do is create their item models properly to display the way you wish (Take a look at JustSomeMoreSpears for an example!)

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft versions listed: 1.21.11, 1.21.5, 1.21.4
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 justanotherlibrarymod-1.1.6-FABRIC-1.21.4.jar — drop this file into the mods folder
Download size: 77 KB
Download link checked 27 Sept 2026 — working

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

Explore more

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