GeoJSON Validator
Validate your Geographic JSON files. Check for errors, warnings, and data quality issues. Free and private — files are processed in your browser.
What we check
- Valid JSON structure
- Required elements and schema compliance
- Coordinate bounds and validity
- Missing or empty feature names
- Duplicate coordinates
- Data quality suggestions
Common issues we detect
Invalid JSON syntax from manual editing or API errors, reversed lat/lon coordinates (GeoJSON requires [longitude, latitude]), coordinates outside valid bounds, missing required 'type' properties, incorrect geometry types for features, invalid coordinate nesting for Polygons and MultiPolygons, and non-compliant structure that breaks mapping libraries.
When to validate your GeoJSON
Before deploying to web maps (Mapbox, Leaflet, OpenLayers) to avoid runtime errors, after generating GeoJSON from scripts or APIs, when debugging mapping library issues, before importing to spatial databases like PostGIS, or when combining GeoJSON from multiple sources to ensure consistent structure and coordinate system compatibility.
Frequently Asked Questions
What does the GeoJSON validator check?
The validator verifies JSON syntax, GeoJSON structure, coordinate validity, required properties, geometry types, and GeoJSON specification compliance. It also checks for common issues like reversed lat/lon, invalid coordinate bounds, and missing feature properties.
Is my GeoJSON uploaded anywhere?
No. Validation runs entirely in your browser using JavaScript. Your GeoJSON data stays on your device and is never sent to any server.
What's the maximum file size?
The browser-based validator handles files up to 5MB. For larger datasets or batch processing, the full Takeout Tools app supports unlimited file sizes.
Can I validate API responses?
Yes! You can paste GeoJSON directly from API responses or load it from a file. The validator will check if the structure matches the GeoJSON specification, making it perfect for debugging API integrations.
Convert GeoJSON files
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