GraphQL vs REST API for UK Software Development — Honest Comparison (2025)
REST is the right default for most UK API development: simpler, easier to cache, better tooling for UK GDPR compliance monitoring, and the GDS API design standard. GraphQL is genuinely better when: clients need flexible queries across complex related data (e.g., product catalogue with nested categories, attributes, and variants), you are building a public API consumed by many different clients with different data needs, or you are building a BFF (Backend for Frontend) aggregating multiple microservices. ClickMasters defaults to REST + OpenAPI 3.0. GraphQL vs REST is one of the most common UK API architecture debates. Here is an honest analysis of where each wins — including the UK GDPR and GDS compliance implications that most comparisons miss.
| Factor | REST + OpenAPI 3.0 | GraphQL |
|---|---|---|
| Learning curve | Low — understood by all engineers | Medium — requires schema design knowledge |
| UK GDPR data minimisation audit | ✅ Easy — endpoints return fixed data shapes | Harder — flexible queries can return unexpected data |
| Caching | ✅ HTTP caching works naturally | Complex — POST-based queries bypass HTTP cache |
| GDS API design guide alignment | ✅ Native REST fit | Not covered by GDS guide |
| GOV.UK API Catalogue listing | ✅ Standard REST + OpenAPI | Not standard |
| Tooling (Swagger, Postman) | ✅ Mature — OpenAPI 3.0 ecosystem | Good but less universal |
| Mobile over-fetching | ⚠️ Fixed responses may over-fetch | ✅ Clients request exact fields needed |
| Rate limiting per operation | ✅ Simple — per endpoint | Complex — per query complexity |
| FCA audit logging | ✅ Simple — log endpoint + method | Complex — log query intent |
| ClickMasters default | ✅ REST + OpenAPI 3.0 for all projects | Only for complex product catalogue / BFF use cases |
Related Pages
ClickMasters Strategy Team
James Whitmore, CTO
Book a Free Consultation Honest advice for your situation. → clickmasterssoftwaredevelopmentcompany.co.uk/contact/
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