
Koremods
A Kotlin Script bytecode manipulation framework
About this Mod
Koremods
Koremods is a Kotlin Script bytecode manipulation framework. It providers modders a new way of transforming (not just) minecraft bytecode with rich IDE support and Gradle integration.
This Modrinth project contains releases for Koremods Modlauncher, the MinecraftForge frontend.
Main Features
- 📦 Sandboxed
- Koremods scripts are executed in an isolated environment to ensure they only access necessary classes and resources
- ⚡ Focused
- Using the ASM Kotlin wrapper Koffee, you can focus on writing transformers without needless boilerplate code
- ☁ Lightweight Runtime
- Near-instant evaluation speeds of scripts pre-compiled by the Koremods Gradle plugin
- 🧩 Portable
- Koremods' feature-rich core allows easy compatibility with your desired platform
- Frontends only need to create a thin layer beween the platform and Koremods Script.
- 🖋️ Rich IDE Support
- Koremods offers first-class syntax highlighting and autocompletion thanks to IntelliJ IDEA’s Kotlin Script support
Documentation
To get started using Koremods in your mod, check our wiki.
Kotlin Script
Kotlin Scripting is a new, experimental technology that lets you run Kotlin code without prior compilation or packaging. All of Kotlin's language features are available, usually with the addition of a speficic DSL provided by the script definition. Scripts are compiled into bytecode at runtime, and then loaded into the JVM using a custom classloader.
Available Versions
How to Install Koremods on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set forge Loader
In the panel under "Egg", select the forge loader and matching Minecraft version (1.20.4).
Install Mod
Open the mod browser in the dashboard and search for "Koremods". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.20.4, 1.20.1, 1.19.3 (+2 more)
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Koremods server crashes on startup – what to do?
Most common cause: wrong forge version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.20.4). You can switch loaders with one click in the panel.
Is Koremods compatible with forge?
Koremods officially supports forge for Minecraft 1.20.4, 1.20.1, 1.19.3. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Koremods – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Koremods consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install Koremods with just one click on your server.