The KotlinLangForge Mod (1.21.8, 1.20.1) is a lightweight yet essential library designed to bring Kotlin language compatibility to both Forge and NeoForge modding platforms. Tailored for developers who prefer writing mods in Kotlin rather than Java, this adapter ensures smoother Kotlin integration within Minecraft’s modding ecosystem. Although it doesn’t add new in-game content, it serves as a critical dependency for other Kotlin-based mods.

Features:
- Kotlin language adapter for Forge and NeoForge
Enables full Kotlin language support when developing mods using either the Forge or NeoForge loader. - Essential development library
This is a backend utility mod that allows Kotlin-written mods to function correctly in a Forge or NeoForge environment. - Does not add in-game content
It introduces no blocks, items, or entities. It’s a support mod required only for functionality and code compatibility. - Required dependency
Any Minecraft mod built with Kotlin and targeting Forge/NeoForge will likely require KotlinLangForge to be present in the mods folder.
Screenshots:





Requires:
How to install:
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Why use KotlinLangForge Mod?
As Kotlin grows in popularity among modern developers, many prefer its concise syntax, null safety, and expressive power over Java. The KotlinLangForge Mod makes it possible to build and run Minecraft mods using Kotlin on both Forge and NeoForge, without worrying about language incompatibility.
This is especially useful for:
- Kotlin developers entering the Minecraft modding scene.
- Modpacks containing Kotlin-based mods.
- Teams migrating existing Forge mods from Java to Kotlin.
Without this adapter, any Kotlin-based mod would fail to launch, making KotlinLangForge a vital part of any development environment using Kotlin.
FAQs
Does this mod add content to Minecraft?
No. KotlinLangForge is a library mod and does not introduce any in-game content like items, mobs, or blocks.
Is this mod required for players?
Only if you’re using another mod that depends on it. Players won’t notice any changes unless a Kotlin-based mod requires this library.
Which mod loaders are supported?
This mod supports both Forge and NeoForge for Minecraft 1.21.8 and 1.20.1.
Can I use Kotlin to write Forge mods with this?
Yes. This mod enables Kotlin compatibility for Forge and NeoForge mod development.
Is KotlinLangForge open-source?
Yes. Most Kotlin language adapters like this one are open-source, allowing developers to contribute or inspect the code if needed.
Download links
- Forge version:download Download file
- Forge version:download Download file
- NeoForge version:download Download file
- NeoForge version:download Download file
- NeoForge version:download Download file
- NeoForge version:download Download file
- NeoForge version:download Download file