tRPC: End-To-End Type Safety Between TypeScript Client And Server

**tRPC** (`trpc.io`) exposes typed **procedures** (queries and mutations) from a server router consumed by TypeScript clients with compile-time inference. It targets monorepos where client and server share types.

Transports typically use HTTP with JSON or **superjson** for Dates and Maps. React Query integration (`@trpc/react-query`) handles caching and invalidation patterns.

tRPC is not a public HTTP API standard for third-party consumers; external partners still need REST, GraphQL, or gRPC with published schemas. Use tRPC internally, expose OpenAPI at the edge if required.

Validate inputs with Zod via `@trpc/server` adapters. Version routers when breaking procedure shapes, or namespace by version prefix.