# A GeoJSON map viewer > Source: > Published: 2026-09-02 19:46:39+00:00 Simon Willison built a GeoJSON map viewer. He needed it while helping gather maps of local political boundaries for the Granada Community Services District and the Midcoast Community Council. The requirement was simple: display GeoJSON files on a map and export the result as a PNG. He asked GPT-5.6-Sol for tool suggestions and it built […]