GeoJSON Validator

The validator checks for invalid JSON, unsupported geometry types, missing type or coordinates fields, self-intersecting polygons, unclosed rings, coordinate arrays with fewer than the required points, and coordinates outside valid latitude/longitude ranges.

GeoJSON uses longitude first, then latitude — the opposite of the Google Maps convention. A valid GeoJSON coordinate looks like [longitude, latitude] e.g. [-0.1278, 51.5074] for London.

No. The validator identifies and describes errors. Manual corrections should be made in the GeoJSON editor or a GIS application.

All GeoJSON objects require a 'type' field. Geometry objects require 'coordinates'. Feature objects require 'geometry'. FeatureCollections require 'features'.

RFC 7946 is the IETF standard that defines the GeoJSON format. It specifies that all GeoJSON coordinates must use the WGS84 datum and longitude-first order.