An app that retrieves the latest changes from the OSM minutely diffs, and displays them in near real-time, (with a fixed offset between 1 and 2 minutes).
It's a Next.js app that uses the OSM minute diffs in osc format. It's parsed into GeoJSON by an API route. The API response is cached on the Vercel CDN, so no more than 1 request per 30 seconds is sent to the OSM servers.
The front-end uses Mapbox GL JS to display the changesets. The data is sent to a webworker which sends updates to the map. The featureState of the displayed features is updated every 50 ms. Because we compute the fixed offset upon receiving the first API response, the updates will show up as they happened (with a minute or two of delay).
Currently, only node additions, deletions, and updates are shown, because the coordinates of edited relations or ways are not available in the diff files.
Inspired by https://github.com/cstenac/osm-livechanges