ArcLib

ArcLib

Arc UI, rendering, and scripting support for Minecraft mods.

ArcLib brings the Arc framework to Minecraft, giving mods a shared foundation for interactive interfaces, 2D graphics, and JavaScript scripting.

If a mod you use requires ArcLib, install the matching version alongside it. ArcLib initializes automatically and provides the runtime that dependent mods need.

What it provides

• UI components: Buttons, dialogs, text fields, scrollable panels, layouts, and animations for custom mod interfaces.
• Minecraft integration: Connects Arc interfaces to Minecraft’s rendering, fonts, mouse, and keyboard input.
• JavaScript support: Includes a Rhino-based scripting environment for mods that use JavaScript to build tools or extend their functionality.
• Shared utilities: Collections, math, file handling, serialization, and lifecycle events for mods built on Arc.
• Dedicated server support: Provides a runtime for server-side logic without requiring a graphical environment.

The features you interact with in-game are provided by the mods that use ArcLib.

Supported versions

Installation

1. Install a supported mod loader for your Minecraft version.
2. Make sure your instance uses the Java version listed above.
3. Download the ArcLib .jar matching both your Minecraft version and mod loader.
4. Place the file in your instance’s mods folder alongside the mod that requires it.
5. On Fabric, install Fabric API for your Minecraft version and use Fabric Loader 0.19.5 or newer.
6. Launch the game or dedicated server.

Install one ArcLib build per instance. For example, a Minecraft 1.21.1 Fabric instance uses arclib-1.21.1-fabric-<version>.jar.

Frequently asked questions

Do I need ArcLib on the client, server, or both?

ArcLib supports clients and dedicated servers. Install it wherever the mod that depends on it requires it. A client-only mod may only need ArcLib on the client; follow that mod’s installation instructions.

Do I need to download Rhino separately?

No. ArcLib includes its Rhino JavaScript runtime.

Why don’t I see a new menu or new items after installing it?

ArcLib is a library that works in the background. Its UI and scripting features become available through mods that use them.

Links and credits

• Source code and developer documentation
• Report an issue
• Original Arc framework by Anuken

Maintained by squi2rel. Licensed under Apache-2.0.