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/geojson

well-formed GeoJSON Feature — Polygon ring closed, coordinates in [longitude, latitude] order, type consistent with coordinates shape, properties member present. Content-Type: application/geo+json.

chaos chaos.catastrophic.io

GET /geojson

Returns GeoJSON documents with RFC 7946 violations. Default returns a Polygon whose ring does not close. Use ?mode= to isolate other violations: lat/lon axis swap, type/coordinates mismatch, or absent `properties` member.

modes: polygon-not-closed coordinates-swapped type-coords-mismatch properties-missing

full chaos docs →

control not.catastrophic.io

GET /geojson

well-formed GeoJSON Feature — Polygon ring closed, coordinates in [longitude, latitude] order, type consistent with coordinates shape, properties member present. Content-Type: application/geo+json.

full control docs →

Build against not.catastrophic.io/geojson, then flip the hostname to chaos.catastrophic.io to exercise the chaos.