London's digital infrastructure, accessible via HTTP. Integrate 6,000+ datasets into your own applications using high-performance REST and GraphQL endpoints.
The City OS for Developers. Build your products on top of our data. Whether you are building a PropTech app, a logistics dashboard, or an insurance model, our API gives you programmatic access to the entire London DB catalog without requiring a Snowflake account.
Choose the tool that fits your stack. Use our standard REST API for simple, resource-oriented lookups (e.g., GET /property/{uprn}). Use GraphQL to fetch complex, nested relationships (e.g., A Property + Its Planning History + Its Flood Risk) in a single request.
We treat our API as a product, not an afterthought. You get fully typed SDKs, interactive documentation (Swagger/GraphiQL), and predictable, versioned endpoints. All responses are strictly typed JSON.
You don't need to manage database drivers or credentials. Our API layer handles the complexity of querying the underlying warehouse, exposing data to your web and mobile applications with low latency and high availability.