OpenAPI (REST) vs. GraphQL / tRPC
OpenAPI vs GraphQL vs tRPC · 2026 API layer call
REST + OpenAPI for external APIs. tRPC for TypeScript-only monorepos. GraphQL when you actually need flexible clients.
option AOpenAPI (REST)option BGraphQL / tRPCserviceWebsites, web apps & online shops
→ Verdict
OpenAPI for external / public APIs and SDK generation. tRPC for TypeScript-only monorepos with tight client-server coupling. GraphQL when multiple clients with varied needs genuinely benefit from flexibility.
Pick a topic
When to pick which
A · Pick this when…
OpenAPI (REST)
- 01External / partner / public API
- 02Multi-language client generation needed
- 03OpenAPI-driven docs + SDKs
B · Pick that when…
GraphQL / tRPC
- 01tRPC: Next.js monorepo, single team
- 02tRPC: end-to-end TypeScript types
- 03GraphQL: multiple clients with varied data needs
- 04GraphQL: legacy backend federation
Factors to weigh
Factor-by-factor
| Factors to weigh | OpenAPI (REST) | GraphQL / tRPC |
|---|---|---|
| Client-language coverage | All (SDK gen) | tRPC TS only, GraphQL all |
| Over-fetching | Possible | tRPC minimal, GraphQL none |
| Versioning | Explicit (v1, v2) | tRPC type evolution, GraphQL deprecation field |
| Learning curve | Low | tRPC low for TS devs, GraphQL medium |
| Caching (HTTP) | Native | tRPC partial, GraphQL hard |
| Schema evolution | Manual (OpenAPI) | tRPC type-safe, GraphQL tool-aided |
| We recommend | External / public APIs | tRPC for TS monorepo, GraphQL for client diversity |
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