GeoJSON Inspector

GeoJSON is deceptively simple until something goes wrong — winding order, coordinate axis confusion ([lng, lat] not [lat, lng]), unclosed rings, or a forgotten "type" field.

The GeoJSON Inspector parses your GeoJSON, reports structural errors line-by-line, pretty-prints the result, and renders all geometries on an interactive map so you can see exactly what you’ve got.

[!TIP] GeoJSON coordinates are always [longitude, latitude] — the opposite of what most people expect. If your polygon appears on the wrong continent, swap your axes.