REST vs GraphQL: choosing an API architecture for your web app

"REST or GraphQL" gets treated like a technology preference, but it's really a question about your clients: how many of them there are, how different their data needs are from each other, and how often that changes. Get the answer to that right, and the API architecture mostly picks itself.

REST fits a small, stable set of clients with similar needs

If one web app and maybe a mobile app consume the API, and their data needs don't vary much, REST's fixed endpoints are simpler to build, cache, and reason about. Standard HTTP caching works out of the box, and most engineers can pick up a REST API without ramp-up time.

GraphQL fits when clients need very different shapes of the same data

A mobile app that needs a lean payload and a web dashboard that needs a deep, nested one, both querying the same underlying data, is the case GraphQL actually solves. Instead of building separate endpoints or over-fetching data one client doesn't need, each client asks for exactly the fields it wants from a single schema.

GraphQL's flexibility has a real cost

A single open query endpoint means you need query complexity limits and depth restrictions, or a client can accidentally (or deliberately) request something expensive to compute. Caching also takes more deliberate design than REST's cache-the-URL default. None of this is a reason to avoid GraphQL, but it is work that a REST API doesn't require.

Both can version and evolve, just differently

REST versions by URL or header; GraphQL evolves its schema by adding fields and deprecating old ones without breaking existing clients. Neither is "easier to maintain" in the abstract. It depends on whether your changes tend to be additive, which suits GraphQL, or require genuinely new contracts, which suits REST's explicit versioning.

A short checklist

• Do different clients need meaningfully different shapes of the same data?
• Is the number of distinct client types small and stable, or growing?
• Does your team have the capacity to add query complexity limits if you pick GraphQL?
• Would standard HTTP caching cover most of your performance needs?
• Are your likely future changes additive, or do they tend to need new contracts?

Our software development service designs the API around the clients that will actually consume it, REST or GraphQL, decided during scoping rather than assumed upfront. Get in touch to talk through your API.