mapshaper

last updated: Oct 20, 2023

Mapshaper is software for editing Shapefile, GeoJSON, TopoJSON, CSV and several other data formats, written in JavaScript.

Mapshaper supports essential map making tasks like simplifying shapes, editing attribute data, clipping, erasing, dissolving, filtering and more.

See the project wiki for documentation on how to use mapshaper.

I mentioned it in TopoJSON, but never actually made a note for the software