Tom MacWright is for drawing, changing, and sharing GeoJSON-formatted map data.

Save as a GitHub Gist and share a link. Hit Cmd-S to do it quickly.

Edit the JSON properties in GeoJSON features easily.

Line-specific JSON-validation errors from jsonlint.

Line-specific GeoJSON-validation errors from geojsonhint.

Use with modern mapping tools, like TileMill, MapBox.js, GitHub, and Shapely.

It’s made of open source: Leaflet.draw, MapBox.js, CodeMirror, and a new library I wrote called geojsonhint, that does GeoJSON validation.