GeoJSON
Maps as JSON: points, lines, polygons.
Where it came from
GeoJSON crystallized in 2008 from a grassroots mailing-list effort to standardize geographic JSON; RFC 7946 (2016) finalized it. It dethroned heavier XML formats (KML, GML) across the mapping world — Leaflet, Mapbox, OpenStreetMap tooling all breathe GeoJSON.
How it works
A FeatureCollection wraps Features; each has `geometry` (Point, LineString, Polygon, Multi* variants) and arbitrary `properties`. Coordinates are [longitude, latitude] — order matters and trips everyone up at least once.
Polygons close their rings (first point = last point) and follow winding-order conventions for holes.
UWC converts GeoJSON to KML (Google Earth), GPX (GPS devices) and CSV (spreadsheets) — all transformations run locally.
Convert GeoJSON
GeoJSON to KML for Earth, GPX for your GPS watch, CSV for reports — client-side.