# mbloch/mapshaper

Tools for editing Shapefile, GeoJSON, TopoJSON and CSV files

Repository: https://github.com/mbloch/mapshaper
Canonical: https://ross.abutalabs.com/products/mapshaper
Homepage: http://mapshaper.org
Language: JavaScript
License: NOASSERTION
License Family: other
Topics: geojson, topojson, shapefile, gis, csv, svg
Last push: 2026-08-21T17:20:48+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 98, release rhythm 86, longevity 100
- inputs: {"age_days": 4943, "days_push": 12, "days_rel": 12, "gap_med": 1, "n_releases_24m": 74}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4168, forks 580 (observed 2026-08-28T04:08:37.932213+00:00)

## What it is
Mapshaper is a JavaScript tool for editing and converting geospatial vector data formats such as Shapefile, GeoJSON, TopoJSON, GeoPackage, GeoTIFF and CSV. It is available as a command-line program, a Node.js library, and an interactive web app that processes data entirely in the browser.

## Use cases
- simplify GeoJSON or TopoJSON polygons for web maps
- convert Shapefile to GeoJSON from the command line
- clip, erase, dissolve or filter map layers
- edit attribute data in geospatial files
- reproject vector data
- merge or split shapefile layers
- clean up slivers and overlapping polygons
- run geospatial data processing in a data pipeline

## When to choose
- you need fast, scriptable editing or conversion of vector GIS formats
- you want to simplify large map files for web visualization
- you prefer a browser-based tool that keeps data private
- you need reproducible geospatial transformations in CI or scripts

## When to avoid
- you need full desktop GIS capabilities like advanced symbology or raster analysis
- you require a maintained permissive license for redistribution (license is non-standard)
- you need heavy 3D or raster geoprocessing beyond GeoTIFF basics

## Facets
- artifact type: cli-tool
- maturity: active
- function: geospatial, data-visualization, cli, parser, image-processing
- domain: developer-tools
- platform: cli, browser, cross-platform
- tags: gis, shapefile, geojson, topojson, geopackage, flatgeobuf, geoparquet, geotiff, kml, csv, simplification, cartography, web-app, svg, geospatial, maps, data-engineering, command-line, nodejs, web-server

## Member repositories
- mbloch/mapshaper (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:37.932213+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:22:45.749612+00:00, confidence not recorded.
  - readme: https://github.com/mbloch/mapshaper (fetched 2026-08-28T04:08:37.932213+00:00, sha 0fe5ee190a5d)
  - homepage: http://mapshaper.org (fetched 2026-08-29T09:13:46.423546+00:00, sha f9c4b2443a1f)
  - site_page: https://mapshaper.org/docs (fetched 2026-08-29T09:13:46.426116+00:00, sha bcec14ed237e)
  - site_page: https://mapshaper.org/docs/reference.html (fetched 2026-08-29T09:13:46.427937+00:00, sha afbbf6d592ed)
- Data as of 2026-08-30T08:39:29.467469+00:00.