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    Simon Willison Builds GeoJSON Map Viewer

    Open source developer shares a tool for visualizing GeoJSON data interactively on OpenStreetMap.

    SW
    1 Source, 29d ago, first seen 29d ago

    TLDR

    Simon Willison announced he created a small tool after finding it faster to build than locate an existing one matching his requirements. The GeoJSON Map Viewer enables pasting GeoJSON objects such as Feature or FeatureCollection into an editor. Users can then adjust fill color and opacity to view the data rendered on an interactive OpenStreetMap background. The project focuses on turning one or more GeoJSON shapes into a rendered PNG output.

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    1 Source, first seen 29d ago

    Combined views

    20.4K

    1 Source, first seen 29d ago

    113 likes
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    30 comments
    56 saves
    4 reposts

    Sentiment

    Positive——Negative

    Summary

    Not enough discussion yet.

    No sentiment analysis available yet.

    1 Source

    @simonwIn another case of it being quicker to build a tool than hunt around to find something that does what you need, here's a little vibe-coded thing for turning one or more GeoJSON shapes into a rendered PNG https://simonwillison.net/2026/Sep/1/geojson/

    1 Source

    @simonwIn another case of it being quicker to build a tool than hunt around to find something that does what you need, here's a little vibe-coded thing for turning one or more GeoJSON shapes into a rendered PNG https://simonwillison.net/2026/Sep/1/geojson/