KLF x KFF

Make KFF works with KLF on 1.20.1 Forge

1.2K Downloads

forgeutility

Rent Server with this Mod

About this Mod

KLF x KFF

This mod is resolving crash when installing KLF(KotlinLangForge) and KFF(KotlinForForge) at the same time in Forge 1.20.1.
And allowing the KFF API working as well.
So that the developer can use latest Kotlin API with KotlinLangForge

Available Versions

0.4.1release

MC 1.20.1forge

May 20, 2026

0.4.0release

MC 1.20.1forge

May 20, 2026

0.3.0release

MC 1.20.1forge

May 20, 2026

0.2.0release

MC 1.20.1forge

December 4, 2025

0.1.0release

MC 1.20.1forge

November 28, 2025

How to Install KLF x KFF 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 (1.20.1).

Install Mod

Open the mod browser in the dashboard and search for "KLF x KFF". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

forge

Minecraft Versions

1.20.1

Server-side

~ Optional

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

KLF x KFF 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 (1.20.1). You can switch loaders with one click in the panel.

Is KLF x KFF compatible with forge?

KLF x KFF officially supports forge for Minecraft 1.20.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with KLF x KFF – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if KLF x KFF 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.