GraphQL

What Is GraphQL?

GraphQL is a modern alternative to REST APIs. Instead of fixed endpoints returning predefined data structures, GraphQL enables clients to request exactly what they need. A client specifies the shape of data desired, and the server returns precisely that—nothing more, nothing less. This flexibility eliminates wasted bandwidth and unnecessary database queries.

GraphQL defines a schema (the shape of available data) and clients write queries against this schema. The server executes queries, fetching only requested data. This approach is particularly powerful for mobile apps (where bandwidth matters) and complex data models (where different clients need different data subsets).

GraphQL enables real-time capabilities through subscriptions, where clients subscribe to updates. It simplifies client development—no need to coordinate multiple REST endpoints. However, GraphQL requires careful design: poorly designed schemas become complex, and caching is more nuanced than REST. GraphQL shines for complex, flexible data requirements.