REST vs GraphQL for Frontend Developers
A common frontend system-design question. Neither is 'better' — they trade off simplicity against flexibility.
The core trade-off
REST exposes resource endpoints (GET /posts) — simple and cacheable, but you can over-fetch (too many fields) or under-fetch (needing several round trips). GraphQL has one endpoint where the client asks for exactly the fields it needs — great for varied screens and mobile, at the cost of added caching and server complexity.
When each wins
Reach for GraphQL when many different clients need flexible, precise data; use REST for simple, cacheable resources; consider a BFF (backend-for-frontend) when the client would otherwise orchestrate many backend calls.
Crack the frontend system design round
APIs, rendering, state, caching and real 'design a [X]' walkthroughs — the System Design Handbook is in the Complete Frontend Kit.
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- Is GraphQL a replacement for REST?
- No — it's an alternative with different trade-offs. Many systems use REST for simple resources and GraphQL where clients need flexible queries.
- How is caching different?
- REST leans on HTTP caching by URL. GraphQL uses a single POST endpoint, so it typically relies on a normalized client cache (Apollo, urql) keyed by entity id.