Catalyst writes mutable data under Electron’s userData directory. The exact base path depends on the operating system and the installed app identity.
Directory layout
Server records
servers.json stores Catalyst’s known server list. Catalyst writes through a temporary file and rotates metadata backups to reduce the chance of losing the index.
Server folders
Each server has its own folder under servers/. Catalyst keeps worlds, plugins, mods, logs, properties, backups, and generated files there.
Do not manually move a running server folder. Stop the server first, then use export/import or move data while Catalyst is closed.
Modrinth manifest
Installed Modrinth projects are tracked in:
Catalyst uses this manifest to update and remove installed projects. Manually copied JARs are not automatically tracked.
Analytics file
The bundled plugin writes combined analytics to:
Catalyst reads this file for the analytics UI. 