Kotlin for Forge
Adds a Kotlin language loader and provides some optional utilities. Free Minecraft Java mod for 1.20.6, 1.21, 1.21.1.
I don't know my version or loader
Used to make mods with the Kotlin programming language. Works by shading the Kotlin libraries, providing KotlinLanguageProvider to load @Mod object declarations, providing AutoKotlinEventBusSubscriber to load @EventBusSubscriber declarations, and providing useful utility functions and constants.
As of Kotlin for Forge 1.8.0, this provides Kotlin 1.4.21, Kotlin coroutines 1.4.2, Kotlin JSON serialization 1.0.1, and Jetbrains annotations 20.1.0.
If you're not a mod developer, this is a dependency mod.
Unlike Kottle, this library (as of 1.2.0) provides its own implementation of IEventBus that supports IEventBus#addListener and IEventBus#addGenericListener with function references.
Information for how to implement can be found here. You do not have to use the language loader or any of the features Kotlin for Forge provides, you can just use it for the bundled Kotlin libraries.
If you'd like to ask for help or suggest something, feel free to do so on the Kotlin for Forge discord server.
- Ships as kotlinforforge-5.12.0-all.jar — drop this file into the mods folder
- Download size: 6.9 MB
- Download link checked 7 Sept 2026 — working
These come from our own check of the pack file, not from the source page.
