- When does GraphQL win?
- Mobile clients that want specific fields, aggregating many backend services, or when frontend teams need type-safe contracts with autocomplete.
- When does REST win?
- Simple CRUD on resources, public APIs used by many consumers, cacheable reads (REST + HTTP caching is excellent), or when the backend team is small.
- What are GraphQL's hidden costs?
- N+1 queries without DataLoader, complex authorization at field level, query complexity analysis to prevent abuse, and frontend overfetching when devs aren't careful.
- Can I use both?
- Yes — many teams have REST for public API and GraphQL for internal. Tailoring the interface to the consumer is often the right call.