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Saving custom world data on server side


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WorldSavedData is your friend.

You can find an (old but still applicable) example here.

The version there will keep one instance of your data per save file. If you wish to have one instance per dimension instead, use


instead here and


instead here.


To store data, just create normal fields in that WorldSavedData class (e.g. if you wish to store a String, make a field of type String). Then read and write this data to NBT in the appropriately named methods. Also remember to call


on your WorldSavedData instance whenver you change any data in it, otherwise Minecraft will not save it to disk.

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