oRPC Guide

oRPC is a type-safe RPC framework that combines end-to-end type safety with OpenAPI compliance. It supports procedures, routers, middleware, context injection, error handling, file uploads, streaming (SSE), server actions, and contract-first development across 20+ framework adapters.

Scope: This guide is specifically for the oRPC library (@orpc/* packages). It is not a general RPC/gRPC guide, not for tRPC-only projects (unless migrating to oRPC), and not for generic TypeScript API development without oRPC. For tRPC-to-oRPC migration, see references/contract-first.md.

Quick Start

Install

npm install @orpc/server@latest @orpc/client@latest

For OpenAPI support, also install:

npm install @orpc/openapi@latest