oRPC — Typesafe APIs Made Simple

oRPC combines RPC with OpenAPI for end-to-end type-safe APIs (v1.12+). It supports Zod, Valibot, Arktype, or any Standard Schema library.

When to Apply

Reference these guidelines when:

• Creating or modifying API procedures (contracts, routers, handlers)
• Setting up middleware (auth, authorization guards, logging)
• Integrating oRPC with Hono or other server frameworks
• Building data fetching hooks with TanStack Query
• Implementing real-time features with event iterators / SSE
• Configuring client links (fetch, WebSocket, batch, retry)
• Handling errors (server-side ORPCError, client-side typed errors)

Core Concepts