CRS / Projection

Enter an EPSG code to set the input CRS of your geometry data (e.g. EPSG:3857 for Web Mercator, EPSG:27700 for British National Grid). Geometries are automatically reprojected to WGS84 (EPSG:4326) for display on the map.

Online GeoJSON Viewer

Render and style GeoJSON geometries, Features, and FeatureCollections on interactive maps. Inspect coordinate arrays, reproject EPSG codes, and export back to WKT, WKB, or BBOX.

Supported GeoJSON Types

Spatial-Sandbox supports all standard RFC 7946 GeoJSON objects:

Point MultiPoint LineString MultiLineString Polygon MultiPolygon GeometryCollection Feature FeatureCollection

GeoJSON Examples

Click Load in Map to test any of these GeoJSON snippets immediately:

{"type":"Point","coordinates":[2.2945,48.8584]}

{"type":"LineString","coordinates":[[-122.4786,37.8100],[-122.4783,37.8199],[-122.4780,37.8300]]}

{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[-73.9731,40.7644],[-73.9579,40.7972],[-73.9818,40.8005],[-73.9819,40.7681],[-73.9731,40.7644]]]},"properties":{"name":"Central Park, New York"}}

WKT Viewer →

Switch to WKT mode for visualizing Well-Known Text strings and PostGIS spatial data.

WKT Validator →

Validate geometry syntax, check coordinate order, and verify polygon boundary closure.