InfraNode is a free public REST API that consolidates open data from German cities, providing a consistent JSON envelope across multiple data sources. It eliminates the need for multiple API keys and allows access to a wide range of data regarding urban environments without advertising or payment barriers.
Build a live city dashboard showing air quality, transit departures, and charging-station availability, or create alerts for floods and heatwaves. You can also make neighborhood planning tools using population and finance time series. You query 82 data types across 84 German cities through one consistent JSON response that always includes source attribution. The service is free and keyless, but calls are rate-limited per IP to protect availability.
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