tRPC Patterns

Quick Guide: tRPC carries types from server to client through one exported type rather than through a generated schema, so export type AppRouter = typeof appRouter is the whole bridge and everything downstream fails without it. Procedures take a validated input and return a value; TRPCError codes are what become HTTP statuses; middleware narrows the context type so an authenticated procedure's ctx.user is non-nullable. In v11 the transformer moved inside the link, subscriptions are async generators, and @trpc/tanstack-react-query is the current React integration.

Detailed Resources:

• examples/core.md — initialization, context, a CRUD router, the provider, inferred types, queryOptions
• examples/middleware.md — logging, rate limiting, resource-scoped access
• examples/infinite-queries.md — cursor pagination end to end
• examples/optimistic-updates.md — the full snapshot-and-rollback cycle
• examples/subscriptions.md — async generator subscriptions with resumable event ids
• examples/file-uploads.md — File in an input schema (v11+)
• reference.md — error code to HTTP status table, batching and invalidation notes, v10 → v11 migration