Quilted Fabric API (QFAPI) / Quilt Standard Libraries (QSL)
The standard libraries of the Quilt ecosystem. Essential for your modding experience on Quilt!
About this Mod
Quilted Fabric API (QFAPI) and Quilt Standard Libraries (QSL)
Essential standard libraries for the Quilt ecosystem. QSL gives modders Quilt-exclusive tools to add new and exciting features to their mods, while Quilted Fabric API provides compatibility with Fabric mods that use the Fabric API.
This project requires Quilt Loader!
The Quilt Project
The Quilt project is an open-source, community-driven modding toolchain designed primarily for Minecraft. By focusing on speed, ease of use and modularity, Quilt aims to provide a sleek and modern modding toolchain with an open ecosystem.
Learn more about Quilt on our website.
Notes
Quilt is currently still in development, and in beta. This means issues may arise but we will do our best to fix them as fast as we can.
Quilted Fabric API does not support the "implementation details" of most of Fabric API. Mods that use implementation details may work on Fabric, but will not work on Quilt.
Available Versions
How to Install Quilted Fabric API (QFAPI) / Quilt Standard Libraries (QSL) on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set quilt Loader
In the panel under "Egg", select the quilt loader and matching Minecraft version (1.21).
Install Mod
Open the mod browser in the dashboard and search for "Quilted Fabric API (QFAPI) / Quilt Standard Libraries (QSL)". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21, 1.20.6, 1.20.4 (+24 more)
Server-side
~ OptionalRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Quilted Fabric API (QFAPI) / Quilt Standard Libraries (QSL) server crashes on startup – what to do?
Most common cause: wrong quilt 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 (1.21). You can switch loaders with one click in the panel.
Is Quilted Fabric API (QFAPI) / Quilt Standard Libraries (QSL) compatible with quilt?
Quilted Fabric API (QFAPI) / Quilt Standard Libraries (QSL) officially supports quilt for Minecraft 1.21, 1.20.6, 1.20.4. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Quilted Fabric API (QFAPI) / Quilt Standard Libraries (QSL) – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Quilted Fabric API (QFAPI) / Quilt Standard Libraries (QSL) 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.
Similar Mods
Rent Modded Server
Install Quilted Fabric API (QFAPI) / Quilt Standard Libraries (QSL) with just one click on your server.