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U-API project artwork

Modrinth · Minecraft mod

U-API

A lightweight core API library for mods built around the U-API ecosystem.

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which U-API release should I use?

Updated today
Latest stable file 2.1.1+mc1.21.1
Game version 1.21.1
Loader NeoForge

U-API 2.1.1+mc1.21.1 targets 1.21.1 with NeoForge. Installation on the client is optional. Installation on the dedicated server is optional. No extra mods listed for this file.

Where it goes

Is U-API required on the client, server, or both?

Installation on the client is optional. Installation on the dedicated server is optional.

Client Optional
Dedicated server Optional
Loader for this release NeoForge
Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source marks this as usable on both the client and server.

Understand client and server requirements Read the Minecraft installation guide

What else does U-API 2.1.1+mc1.21.1 need?

2.1.1+mc1.21.1. Change the file and its required mods may change too.

No extra mods listed for this file

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 U-API without breaking your instance.

Built for U-API 2.1.1+mc1.21.1. Pick another file and the loader, install side or required mods may change.

  1. 01

    Stick to this file

    Use 2.1.1+mc1.21.1. It targets 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.

  2. 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.

  3. 03

    Put it on the correct side

    Installation on the client is optional. Installation on the dedicated server is optional.

  4. 04

    Pick the file you checked

    Use the “Get this file” button beside 2.1.1+mc1.21.1. It opens that exact file at the source.

About this project

What does U-API add?

u-api-banner

About U-API

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.

U-API is not meant to be a standalone content mod.
You should install it when another mod lists it as a required dependency.

What it is used for

  • Shared API foundation for related mods
  • Common utilities and internal systems
  • Consistent integration between dependent mods
  • Cleaner modular structure for future projects

For players

Install U-API only if a mod requires it.

By itself, U-API does not add new gameplay content, blocks, items, mobs, dungeons, or progression systems.

For modpacks

U-API can be safely included in modpacks when required by other mods from the same ecosystem.

Compatibility

  • Loader: NeoForge
  • Minecraft: 1.21.1
  • Environment: Client and Server

Project description from Modrinth.

Pick your setup

U-API by Minecraft version and loader

Choose the version and loader you play, then open the matching release.

2 available setups

Check the dependencies, then try the file in a copied instance before changing a world you care about.

Recent files

U-API versions and loaders

13 of 13 releases match

Looking for an older file? The official Modrinth project page is in Resources.

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