How do I fully remove a mod without leaving broken data or crashing?

Removing a mod cleanly is more than deleting a jar — mods that added blocks or items leave traces in your world. Here's how to remove one safely and what to expect afterward.

Removing a mod

1. Stop the server.
2. Delete the mod's .jar from the mods folder (and any of its config files in config if you want a clean slate).
3. Be aware: if the mod added blocks/items to your world, removing it can cause "missing content" warnings or holes where its blocks were — that's expected.
4. Start and watch the Console.

The world-altering caveat

Removing world-altering mods from an existing world can corrupt or scar it.

Warning: Back up first (Back up now on your server's Backups page, or download your world via Files/SFTP), and ideally remove world-altering mods only alongside a world reset.

Frequently asked questions

Why are there holes in my world after removing a mod? That mod added blocks or items; removing it leaves "missing content" gaps — that's expected behaviour.

Is it safe to remove any mod mid-world? Lightweight mods usually, yes. World-altering mods can scar or corrupt the world — back up first and ideally pair the removal with a reset.