About GeoJason
Free browser-based GeoJSON developer tools. View validate convert and transform spatial data with no signup required.
GeoJason is a free suite of developer tools for working with GeoJSON, the open standard format for encoding geographic data structures. The site is built for developers, GIS analysts, and anyone who works with spatial data on the web.
Every tool runs entirely in your browser. Your data is never uploaded to a server, stored, or shared with third parties. There is no signup, no account, and no usage limits.
What You Can Do
GeoJason provides over 30 tools organized into three categories:
Tools — View GeoJSON on an interactive map, validate it against the RFC 7946 specification, simplify geometries to reduce file size, calculate areas, lengths, centroids, and bounding boxes, generate points and polygons, merge multiple files, create buffers, clip, union, intersect, dissolve, flatten multi-geometries, fix winding order, flip coordinates, and reduce coordinate precision.
Converters — Convert between GeoJSON and other common geospatial formats including KML (Google Earth), WKT (databases like PostGIS), GPX (GPS tracks), and latitude/longitude coordinate pairs.
Guides — In-depth developer guides covering the GeoJSON specification, best practices, coordinate reference systems, format comparisons, web mapping libraries, and using GeoJSON with PostGIS.
Technology
GeoJason is built with Next.js and uses Leaflet for map rendering and Turf.js for spatial analysis. All processing happens client-side using JavaScript — no backend server is involved in data processing.
Contact
For bug reports, feature requests, or questions, email us at info@geojason.com.