About Kotlin for Forge
From ModrinthAdds a Kotlin language loader and provides some optional utilities.
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.
Highlights
From source dataGame versions
Supports 48 Minecraft versions, the newest being 26.3.
Loaders
Runs on Forge and NeoForge.
Footprint
Rated a light load on a server.
Kotlin for Forge on Nxeon
From our catalogue- One-click install
- Supported on Nxeon Minecraft servers. We download it from Modrinth, place it, and restart the server.
- Server side
- Optional on the server
- Server type needed
- Forge, NeoForge
- Server load
- light
- Smallest plan we suggest
- Minecraft — 2 GB (2 GB RAM). This follows our own load rating above, not a benchmark.
- Latest build
- 6.4.0, released 2026-10-10
Game versions by loader
| Loader | Game versions | Newest |
|---|---|---|
| NeoForge | 1.20.6 to 26.3 (18 versions) | 26.3 |
| Forge | 1.20.6 to 1.21.8 (10 versions) | 1.21.8 |
From 6 recorded builds of Kotlin for Forge.
Recent builds
| Build | Released | Game versions | Loaders |
|---|---|---|---|
| 6.4.0 | 2026-10-10 | 1.21.9 to 26.3 (8 versions) | NeoForge |
| 5.12.0 | 2026-06-28 | 1.20.6 to 1.21.8 (10 versions) | Forge, NeoForge |
| 6.3.0 | 2026-06-28 | 1.21.9 to 26.2 (7 versions) | NeoForge |
| 6.2.0 | 2026-03-10 | 1.21.9 to 26.1.2 (6 versions) | NeoForge |
| 5.11.0 | 2026-01-17 | 1.20.6 to 1.21.5 (7 versions) | Forge, NeoForge |
| 6.1.0 | 2026-01-17 | 1.21.9 to 1.21.11 (3 versions) | NeoForge |
Run Kotlin for Forge on a Minecraft server
Pick a server or deploy a new one above; it is installed in one click.
What kind of mod it is
From the catalogQuality of life & UI
Small conveniences, tweaks and interface improvements players notice straight away.
Works on a server
From source side supportModrinth lists server-side support for Kotlin for Forge as optional: it can run on a server, but isn’t required there.
Compatibility
- Game
- Minecraft
- Loaders
- ForgeNeoForge
- Runs on
- Serveroptional on the server
- Game versions
- 26.3 and 47 earlier
Verified at the source
- ✓ModrinthOfficial listing, checked 2026-10-18Open ↗
- ✓Authorthedarkcolour, as published on Modrinth
- ✓LicenseLGPL-2.1-onlyFree
