GeoJason

About GeoJason

Free browser-based GeoJSON developer tools. View validate convert and transform spatial data with no signup required.

GeoJason as a GeoJSON Feature. Paste it into the viewer — it lands on the office.

{
"type":
"Feature",
"geometry":
{
"type":
"Point",
"coordinates":
[-117.15704, 32.70720]
},
"properties":
{
"name":
"GeoJason",
"tagline":
"Free browser-based GeoJSON developer tools",
"started":
"2026-03",
"operator":
{
"name":
"Jason H.",
"role":
"Software engineer",
"experience_years":
20,
},
"why_it_exists":
"Most GeoJSON tools require accounts, upload your data, or only do one thing. GeoJason runs everything in your browser tab — no signup, no upload, no per-feature pricing.",
"what_it_does":
[
"View GeoJSON on an interactive map",
"Validate against RFC 7946",
"Convert between GeoJSON, KML, WKT, GPX, and lat/long",
"Calculate area, length, centroid, bounding box",
"Simplify, buffer, clip, union, merge"
],
"stack":
{
"framework":
"Next.js",
"spatial":
"Turf.js",
"maps":
"Leaflet + OpenStreetMap + ArcGIS",
"language":
"TypeScript"
},
"privacy":
{
"data_uploaded":
false,
"tracking":
["Google Analytics 4", "Google AdSense"],
"details":
"/privacy"
},
}
}

For the full privacy details, see the privacy policy. For terms of use, see the terms of service.