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Mapshaper

Project4.2K

Edit, simplify, filter, clip, erase, and dissolve geospatial data.

Added 2026-10-07
Replaces
GitHub

What you can build

  • Build a repeatable workflow that takes county-boundary GeoJSON and writes a simplified version for a lighter map.
  • Build a script that takes a GeoJSON features file and a study-area boundary, then outputs the features clipped to that area.
  • Create a workflow that takes a coverage layer and exclusion-zone geometry and writes a version with those areas erased.
  • Build a transformation that takes jurisdiction polygons and produces dissolved boundary geometry for a simplified regional map.
  • Create a batch step that filters a GeoJSON dataset by an attribute value and writes the matching features to a separate output.

Try this prompt

Build a small Node.js command-line adaptation that reads a GeoJSON features file and a GeoJSON study-area boundary, clips the features to that boundary with Mapshaper, and writes a new GeoJSON output. Keep the input files unchanged. Include clear input and output paths, report failures without overwriting existing data, and document the steps needed to run the workflow. Use only Mapshaper capabilities documented in its command reference.

Get started

  1. Meet the runtime requirement

    Install Node.js, which Mapshaper requires for its command-line tools. The README links to the official Node.js site.

  2. Choose an interface

    Use the README's npm installation guidance for the command-line tools, or run the documented local web interface with mapshaper-gui.

  3. Learn the operations

    Use the official command-line introduction and command reference linked from the README to plan a workflow using the supported editing operations.

License & notes

MPL-2.0Mapshaper is free and open source under MPL-2.0. No paid model or API is described. You provide the runtime and compute; hosting costs apply if you host your own interface or workflows. MPL-2.0 has file-level copyleft obligations for covered files when distributing a modified version; it permits combining covered code with differently licensed code under its terms.

  • Large files may make Mapshaper unresponsive or cause JavaScript heap out-of-memory errors; the README documents a higher-memory CLI variant.
  • The maximum output size for a single file is 2GB, though some input formats can be read incrementally.
  • The browser interface supports recent desktop browsers; Safari before 10.1 and Internet Explorer before 10 are unsupported. The README notes Chrome may run out of memory with very large imports.

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