How to Install Fabric Mods Alongside Forge Mods Using Sinytra Connector

Prepare Your Mods Folder

Sinytra Connector lets a Forge or NeoForge instance load Fabric mods, but it does not make every Fabric mod compatible. Start by placing your Forge mods in the mods folder as usual. Then add the Fabric mods you want to use into the same mods folder — do not create a separate Fabric mods directory. Connector reads Fabric mods from the standard mods folder and translates their loader calls into Forge-compatible ones at runtime.

Handle Fabric API and Dependencies

Many Fabric mods declare Fabric API as a dependency. Connector includes a bundled compatibility layer that stands in for Fabric API, so you generally do not need to add the standalone Fabric API jar. If a Fabric mod lists other Fabric library mods as dependencies, place those library jars in mods too — Connector will load them. Avoid mixing a standalone Fabric API jar with Connector unless a specific mod's documentation tells you otherwise, since duplicate API classes can cause crashes.

Launch and Check the Log

Start the game through your Forge or NeoForge launcher profile. Watch the log for lines mentioning Connector and any Fabric mods it loaded or skipped. If the game crashes on startup, remove Fabric mods one at a time to isolate the incompatible one. Mods that use deep Fabric-specific hooks, custom rendering pipelines, or mixins into Fabric-only classes are the most likely to fail. Keep a backup of your world before adding new Fabric mods to an existing Forge pack.