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Fabric Language Kotlin Mod Wiki & Guide

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A Fabric library mod that provides Kotlin language support for other mods, enabling them to run Kotlin code. It adds no items, blocks, or gameplay content of its own.

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Contents (5)
  1. Overview
  2. Guides
  3. Frequently asked questions
  4. Gallery
  5. You May Also Like

Overview

Fabric Language Kotlin (FLK) is a backend utility and core library mod designed to bridge the gap between the Minecraft Fabric modding toolchain and the Kotlin programming language. Developed and maintained by modmuss50 and the Fabric team, this mod serves as a prerequisite for numerous popular mods, including Tech Reborn and Reborn Core.

Fabric and Kotlin Integration

Unlike traditional content mods, Fabric Language Kotlin does not add physical items, blocks, or mobs to the game world. Instead, it provides the necessary environment for other mods written in Kotlin to function. It bundles the Kotlin standard library, reflection, and coroutines, ensuring that players do not need to manually install these components to run Kotlin-based mods.

Guides

Step-by-step, in-game.

Checking Whether Fabric Language Kotlin Is Safe to RemovePlayers often spot Fabric Language Kotlin in their mod list, see that it adds nothing they can use, and assume it is…Fixing a Crash Caused by a Missing or Mismatched Kotlin LibraryThe most common reason players interact with Fabric Language Kotlin at all is a crash. Kotlin-based mods compile down…How to Install Fabric Language Kotlin as a Dependency for Another ModFabric Language Kotlin is a library, not a content mod. You will almost never install it because you want it for…Understanding Why Fabric Language Kotlin Adds No Items or BlocksNew players sometimes install Fabric Language Kotlin expecting new content and are confused when nothing changes…

Frequently asked questions

What does Fabric Language Kotlin actually do if it adds nothing?
It bundles the Kotlin runtime and language libraries so other mods written in Kotlin can run on Fabric. You never interact with it directly; it just sits in your mods folder enabling those mods to work.
Do I need to install Fabric Language Kotlin by itself?
No. It only exists to support other mods, so you install it when a mod you want lists it as a dependency. On its own it changes nothing in your game.
How do I know if a mod needs Fabric Language Kotlin?
Check the mod's dependencies section on its download page or in its mod metadata; Kotlin-based mods list Fabric Language Kotlin as a required dependency. If the game crashes with a missing Kotlin class error, that's also a sign.
The game crashes saying a Kotlin class is missing — what do I do?
That means a Kotlin mod is present but the Kotlin library isn't, or the installed version is too old for that mod. Add or update Fabric Language Kotlin so it matches what the dependent mod expects.

See all 20 Fabric Language Kotlin questions ›