WorldPainter allows executing JavaScript files (.js) in its own scripting API.

1. Download the script from GitHub or <#1095425730206257266>.
2. In WorldPainter, top-center click Tools -> Run Script.
3. Select the path to your downloaded script in the file tab.
4. Set the parameters in the window for the script.
5. Run the script.
6. Close the window. Undo/Redo works for scripts too.

Warning: Once started, there is no way to interrupt a script without crashing worldpainter. Save your work before running a script.