U-API
by tracerxbrhd
U-API is a NeoForge library mod that other mods built around the U-API ecosystem use for shared systems and utilities.
What it does
The library provides a common core for dependent mods, including shared systems, utilities and integration points. Mods that build on it can stay consistent with one another, since they draw on the same foundation instead of each carrying their own copy of the same code. The project describes itself as lightweight, so it is meant to stay small and focused on the core layer rather than add content of its own.
U-API is meant as a foundation and not as a standalone content mod, so installing it alone adds no blocks, items or mobs. Mods that list it as a required dependency need it in place before they will start. Every player and the server need a copy of the mod. Files target NeoForge only, for 1.21.1 and 26.2, with 3.0.0+mc26.2 as the latest file for 26.2, published on 2026-09-01. The code is open source under the GNU Lesser General Public License v3.0 only.
Key features
Shared core systems
Provides the common systems that dependent mods call, so they do not need to implement them separately.
Shared utilities
Supplies internal utility code that the ecosystem reuses across its modules.
Integration points
Offers defined hooks that dependent mods use to connect with each other through the same foundation.
Modular structure
Organized into separate parts so that future projects can take only the pieces they need.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Required by 1 mod
Use cases
Who it’s for: Mod developers building on the U-API ecosystem, and players who install a mod that lists U-API as a required dependency.
How it compares
Alexandria Lib is a library for Fabric and NeoForge, with files for 1.21.1 only, released under All rights reserved and not open source. EverythingCore is a NeoForge library for 1.21.8 – 26.2 under the MIT License, and it is not open source either. NeoPlots is a NeoForge mod for 1.21.1 that runs on the server alone, so players join without installing it, and its license is All rights reserved. U-API is client and server, open source under the GNU Lesser General Public License v3.0 only, and covers 1.21.1 and 26.2.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| U-API | NeoForge | 1.21.1 – 26.2 | Client and server | 2026-09-01 |
| Alexandria Lib | Fabric and NeoForge | 1.21.1 | Client and server | 2026-09-30 |
| EverythingCore | NeoForge | 1.21.8 – 26.2 | Client and server | 2026-09-06 |
| NeoPlots | NeoForge | 1.21.1 | Server-side only | 2026-01-10 |
Questions
Does a mod that needs U-API have to be installed on both sides?
Which loader does U-API support?
Which game versions have U-API files?
Can U-API be used without another mod that requires it?
In the catalog
U-API is one of 3,514 Library mods on ModsFinder, and one of 1,449 Library mods for NeoForge. 13,894 mods support Minecraft 26.2.
More from tracerxbrhd
Similar mods
What the author says
U-API is a lightweight foundational library for Minecraft mods built around the U-API ecosystem. It provides shared systems, utilities, and integration points used by dependent mods, helping them stay consistent, modular, and easier to maintain.
Official listing
- Modrinth page
- modrinth.com/mod/u-api
- Owner
- tracerxbrhd
- Published
- 2026-06-30
- Updated on Modrinth
- 2026-09-01
- Facts verified
- 2026-10-15