oRPC

oRPC is a TypeScript framework for building end-to-end typesafe APIs. Write your API once as plain TypeScript functions, and oRPC gives you a fully typed client, a REST API with an OpenAPI document, and MCP tools for AI agents, with no code generation. It runs on Node.js, Bun, Deno, Cloudflare Workers, and more.

Define procedures on the server and serve them with an RPC handler:

import { os } from '@orpc/server'
import * as z from 'zod'

export const router = {
  planet: {
    find: os
      .input(z.object({ id: z.number() }))
      .handler(({ input }) => ({ id: input.id, name: 'Earth' })),
  },
}

Then call them from a client that knows every input and output, without generating anything:

import { createORPCClient } from '@orpc/client'
import { RPCLink } from '@orpc/client/fetch'
import type { RouterClient } from '@orpc/server'

import type { router } from './router'

const link = new RPCLink({ origin: 'http://localhost:3000', url: '/rpc' })
const client: RouterClient<typeof router> = createORPCClient(link)

const planet = await client.planet.find({ id: 1 }) // { id: number, name: string }

Documentation

Read the full documentation at orpc.dev, starting with the Getting Started guide.

Packages

Core

Package	Purpose	Docs
@orpc/contract	Define API contract as the single source of truth.	Procedure Contract, Contract Router, Implementation, Generate from OpenAPI
@orpc/server	Build APIs or implement contracts.	Procedure, Router, Middleware, Context, RPC Handler
@orpc/client	Consume APIs with end-to-end type safety.	Client-Side Clients, Server-Side Clients, RPC Link, Error Handling
@orpc/openapi	Add OpenAPI compatibility to APIs.	OpenAPI Handler, OpenAPI Link, Specification, Scalar

Schema validation

Package	Purpose	Docs
@orpc/zod	JSON Schema converter for Zod.	Zod
@orpc/valibot	JSON Schema converter for Valibot.	Valibot
@orpc/arktype	JSON Schema converter for ArkType.	ArkType

Built-in features

This is the beginning of the README. Read the rest at the original. Read the full README ↗