GraphQL vs REST: Modern API Design Choices

GraphQL has emerged as a compelling alternative to REST for API design, but understanding when to use each matters. REST endpoints return fixed data structures—when you request /users/123, you get everything the server decides. GraphQL gives clients the power to ask for exactly what they need, nothing more, nothing less. This solves the problems of over-fetching (getting too much data) and under-fetching (needing multiple requests). GraphQL's single endpoint simplifies client code, and its strongly typed schema provides self-documentation. However, GraphQL shifts complexity to the server. Resolvers need to handle nested queries efficiently, and caching becomes more complex than REST's straightforward URL-based approach. Use GraphQL when you have complex data relationships, multiple clients with different data needs, or teams that want to iterate quickly without backend changes. Stick with REST when your API is simple, caching is critical, or you're building public APIs where clients expect REST conventions. Many teams adopt a hybrid approach—GraphQL for mobile apps that need efficient data fetching, REST for simpler use cases. Learn both, and you'll make better architectural decisions.