whathappened.here is a lightweight, map-first social check-in and review application built on top of OpenStreetMap. It acts as an open-source decentralized alternative to Foursquare, allowing users to log into OpenStreetMap, explore places, write reviews with Markdown and image uploads, and permalink specific posts or locations.
Features
- OpenStreetMap Integration & OAuth 2.0: Secure authentication using native OSM credentials.
- Interactive Leaflet Mapping: Powered by Leaflet.js with GPS locating controls and bounding box scanning.
- Photon Geocoding Search: Fast place lookup with auto-complete results and custom coordinate copying.
- Overpass API Discovery: Dynamic detection of named locations directly from the current map viewport.
- Dedicated Standalone Pages & Permalinks: Full interface pages for individual user posts and specific places with clean, shareable URLs.
- Rich Markdown & Image Uploads: Write detailed reviews formatted with Markdown and upload inline images.
- Post Management: Edit or delete your own posts directly within the interface.
Screenshots
