Preview GeoJSON on a live map

Paste a GeoJSON FeatureCollection, Feature, or Geometry. The viewer wraps single Features and bare Geometries in a FeatureCollection for display and download.

• Point features render as markers
• Lines, polygons, and other non-point features render in the overlay
• The view is centered and fitted from the collection bounds

Parsing, geometry splitting, bounds calculation, and GeoJSON download run in the browser. The live basemap still makes normal network requests for map resources.

• The GeoJSON is not posted to a MapsMaker application endpoint by this component
• The text and preview are session state and disappear on refresh
• Download the FeatureCollection before leaving if you need to keep the wrapped version

The validation action confirms that the JSON can be interpreted as GeoJSON and that a bounding box can be calculated. It is not schema-complete, topology-aware, or projection-aware validation.

• Swapped latitude and longitude can still produce a misleading result
• Invalid or unusual geometry may fail during bounds calculation
• The tool does not reproject non-WGS84 coordinates

Start with the smallest relevant feature and check coordinates before pasting a large collection.

• Confirm web coordinates are longitude then latitude
• Check that the collection contains at least one feature with usable coordinates
• Reduce a large or complex collection if the browser becomes unresponsive
• Use the polygon-specific tool only when the question is about Polygon or MultiPolygon structure

Use this viewer to inspect pasted GeoJSON, Draw on a Map to create one polygon manually, and the full editor to import supported files and publish a saved map.

• This page does not accept KML or GPX
• The editor separately imports GeoJSON, KML, and GPX within current safety limits
• No static-image export is produced by this viewer