GraphQL vs tRPC: Schema-First or TypeScript?
GraphQL is a language-agnostic, schema-based query layer; tRPC gives end-to-end TypeScript type safety between client and server with no schema or codegen.
GraphQL defines a typed schema any client or language can consume, with flexible queries and a rich ecosystem, suiting public APIs and polyglot clients. tRPC is TypeScript-only: server procedures are imported as fully typed client calls, eliminating schemas and codegen for full-stack TS apps, but only within the TS world. GraphQL favors flexibility and interoperability; tRPC favors zero-friction type safety in TS monorepos.
| GraphQL | tRPC | |
|---|---|---|
| Languages | Any | TypeScript only |
| Schema | Explicit, typed | Inferred from code |
| Codegen | Often needed | None |
| Clients | Polyglot, public | TS full-stack |
| Best for | Public/varied clients | TS monorepos |
Use case and type safety
GraphQL fits public APIs, mobile, and polyglot consumers needing a formal contract. tRPC fits full-stack TypeScript apps (often Next.js) where client and server share types directly, giving instant end-to-end safety without a schema, but it cannot serve non-TS or external consumers as cleanly.
In CI
GraphQL pipelines validate the schema and run client codegen. tRPC relies on the TypeScript compiler, so type-check is the main gate. Both run on managed runners, where faster runners shorten type-check and codegen steps.
The verdict
Public APIs or polyglot clients needing a formal, flexible contract: GraphQL. Internal full-stack TypeScript apps wanting frictionless end-to-end type safety: tRPC. tRPC is excellent inside a TS monorepo; GraphQL is the choice when external or non-TS consumers matter.