ArbiterLib
by bluffcon
ArbiterLib is a Minecraft datapack framework library that gives datapack authors shared tools for blocks, crafting, tags and items.
What it does
The library provides a centralized block registry, so tick handling and placement logic are kept in one place instead of being rebuilt in each datapack. It includes building blocks such as a workbench and a smeltery that mimic vanilla blocks, and it offers commands that cover shortcuts like y-motion changes, quick heads and instakills.
Player data is stored centrally through IDs in scoreboard data storage, where anything can be stored and retrieved. Only the server has to run ArbiterLib: it works on the server alone, and players may leave it out. Files are published for Fabric and NeoForge across six release versions, 1.21.9 – 26.3, and the library is open source under the MIT License. Two catalog mods require it, Autofisher Net! and Sulfur Expansion.
Key features
Centralized block registry
Blocks are registered in one place, with their ticks and placement handled by the library rather than by each datapack.
Crafting stations
A workbench and a smeltery mimic vanilla blocks, so new crafting stations can be added without writing the logic from scratch.
Quick command actions
Commands cover shortcuts such as y-motion changes, quick heads and instakills.
Central player data
Player data is stored through IDs in scoreboard data storage, giving datapacks one shared place to keep and read values.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Required by 2 mods
Use cases
Datapack authors
Authors who build crafting blocks, tags and items can reuse the framework instead of implementing the same logic in every pack.
Who it’s for: Datapack authors and server owners who run datapacks that depend on the library, since the server has to run it.
How it compares
Utils is open source under the MIT License and is needed on the server, with the client optional, but its files cover 1.21 – 1.21.8 and it also loads on Forge and Quilt. Faux Custom Entity Data is a client and server library under the GNU Lesser General Public License v2.1 only, for Fabric alone, covering 1.18.1 – 26.2. NoxaFrame is client-side only and open source under the Mozilla Public License 2.0, for 1.20.1 – 1.21.1.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| ArbiterLib | Fabric and NeoForge | 1.21.9 – 26.3 | Server required, client optional | 2026-09-24 |
| Utils | Fabric, Forge, NeoForge and Quilt | 1.21 – 1.21.8 | Server required, client optional | 2025-03-26 |
| Faux Custom Entity Data | Fabric | 1.18.1 – 26.2 | Client and server | 2026-06-17 |
| NoxaFrame | Fabric and NeoForge | 1.20.1 – 1.21.1 | Client-side only | 2026-04-20 |
Questions
Does Autofisher Net! need ArbiterLib?
Does the server need ArbiterLib installed?
Which loaders have ArbiterLib files?
In the catalog
ArbiterLib is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 8,071 mods support Minecraft 26.3.
More from bluffcon
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What the author says
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! 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…
Official listing
- Modrinth page
- modrinth.com/mod/arbiterlib
- Owner
- bluffcon
- Published
- 2026-04-08
- Updated on Modrinth
- 2026-09-24
- Facts verified
- 2026-10-15