
Modrinth ยท Minecraft mod
ArbiterLib
๐ โข Minecraft datapack framework with crafting, blocks, tags, items, and other utils!
Quick answer
Which ArbiterLib release matches 1.21.9?
ArbiterLib a2 targets 1.21.9, 1.21.10 with datapack, minecraft. Installation on the client is optional. Installation on the dedicated server is optional. No extra mods listed for this file.
Where it goes
Is ArbiterLib required on the client, server, or both?
Installation on the client is optional. Installation on the dedicated server is optional.
The source marks this as usable on both the client and server.
What else does ArbiterLib a2 need?
a2 on 1.21.9. Every mod below is checked against that same setup.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add ArbiterLib without breaking your instance.
Built for ArbiterLib a2 on 1.21.9. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use a2. It targets 1.21.9, 1.21.10 with datapack, minecraft; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
Installation on the client is optional. Installation on the dedicated server is optional.
- 04
Pick the file you checked
Use the โGet this fileโ button beside a2. It opens that exact file at the source.
About this project
What does ArbiterLib add?

ArbiterLib โ๏ธ
Arbiter is a Minecraft datapack framework library, your tool for quicker implementation of things you wish to make. It makes things easier for those who wish to use it!
It is recommended to follow this project (โค๏ธ) or join the Discord to receive updates about the latest versions (which are always required)!
What it has to offer
- Crafting: a workbench and a smeltery, mimicking vanilla blocks.
JEI Integration for all Arbiter recipes and items via ArbiterJEI
Commands for quick actions like applying y-motion, quick heads, instakills, etc.
Block registry and centralized ticks. Placement logic and removal handled by Arbiter!
Centralized player data storage, via ID in scoreboard and data storage, for storing and retrieving anything persistent
These are not new features, there are already libraries that make blocks or add crafting stations. But Arbiter does it all in one place, and Arbiter wants to do them better than anything else.
Feature requests and issues are more than welcome! Any size or complexity.
Using Arbiter
If you wish to use ArbiterLib for your project, please read the full Readme file on GitHub
Check out the Template Project for Arbiter to get started! All requirements in implementation are already there. It's always kept up-to-date with the features of this repo.
Afterword
See the GitHub for source code, in-depth explanations of the features, and issues.
Join the Discord to chat about your projects you may develop with this, about datapacks that use this framework, or anything else in the world!
Arbiter could make things easier for you, but could also make them take more time depending on how you work. You're free to use it or not use it!
Thank you for reading.
Project description from Modrinth.
Pick your setup
ArbiterLib by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
26.1.2
3 loader builds26.1.1
1 loader build26.1
1 loader build1.21.10
1 loader build1.21.9
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
ArbiterLib versions and loaders
a2
arbiterlib_a2.zip
12 May 2026
a1
arbiterlib_a1.zip
8 May 2026
Looking for an older file? The official Modrinth project page is in Resources.