Anvil

Package anvil reads level.dat and .mca region files which make up Minecraft worlds.

This library allows loading, modifying and saving of all the information. This means it can be used to analyze the contents of a world, but also change it to create new worlds.

Warning

The code defines read->write->read roundtrip tests to ensure the written data is consistent and correct. Even so, you should always create backups of any world you are about to change. I am not responsible for any damage you may do to your world data or Minecraft itself.

This package has been tested with world data created in Vanilla Minecraft 1.8.3+. There are no guarantees that older worlds can be read or that changes to such a world will still load up in Minecraft. Test your changes thoroughly. And when you're done testing, test some more.

Additionally, don't read/write world data which is currently being used by Minecraft itself. The behaviour of this undefined and will very likely end up in tears.