<h1 align="center">oRPC - Typesafe APIs Made Simple 🪄</h1>
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**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](https://orpc.dev/docs/rpc/handler):
```ts
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:
```ts
import type { RouterClient } from '@orpc/server'
import type { router } from './router'
import { createORPCClient } from '@orpc/client'
import { RPCLink } from '@orpc/client/fetch'
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](https://orpc.dev), starting with the [Getting Started guide](https://orpc.dev/docs/getting-started).
## Packages
**Core**
| Package | Purpose | Docs |
| -------------------------------------------------------------- | -------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| [@orpc/contract](https://www.npmjs.com/package/@orpc/contract) | Define API contract as the single source of truth. | [Procedure Contract](https://orpc.dev/docs/contract/procedure), [Contract Router](https://orpc.dev/docs/contract/router), [Implementation](https://orpc.dev/docs/contract/implementation), [Generate from OpenAPI](https://orpc.dev/docs/contract/generate-from-openapi) |
| [@orpc/server](https://www.npmjs.com/package/@orpc/server) | Build APIs or implement contracts. | [Procedure](https://orpc.dev/docs/procedure), [Router](https://orpc.dev/docs/router), [Middleware](https://orpc.dev/docs/middleware), [Context](https://orpc.dev/docs/context), [RPC Handler](https://orpc.dev/docs/rpc/handler) |
| [@orpc/client](https://www.npmjs.com/package/@orpc/client) | Consume APIs with end-to-end type safety. | [Client-Side Clients](https://orpc.dev/docs/client/client-side), [Server-Side Clients](https://orpc.dev/docs/client/server-side), [RPC Link](https://orpc.dev/docs/rpc/link), [Error Handling](https://orpc.dev/docs/client/error-handling) |
| [@orpc/openapi](https://www.npmjs.com/package/@orpc/openapi) | Add OpenAPI compatibility to APIs. | [OpenAPI Handler](https://orpc.dev/docs/openapi/handler), [OpenAPI Link](https://orpc.dev/docs/openapi/link), [Specification](https://orpc.dev/docs/openapi/specification), [Scalar](https://orpc.dev/docs/openapi/scalar) |
**Schema validation**
| Package | Purpose | Docs |
| ------------------------------------------------------------ | ---------------------------------------------------------- | ----------------------------------------------------- |
| [@orpc/zod](https://www.npmjs.com/package/@orpc/zod) | JSON Schema converter for [Zod](https://zod.dev/). | [Zod](https://orpc.dev/docs/integrations/zod) |
| [@orpc/valibot](https://www.npmjs.com/package/@orpc/valibot) | JSON Schema converter for [Valibot](https://valibot.dev/). | [Valibot](https://orpc.dev/docs/integrations/valibot) |
| [@orpc/arktype](https://www.npmjs.com/package/@orpc/arktype) | JSON Schema converter for [ArkType](https://arktype.io/). | [ArkType](https://orpc.dev/docs/integrations/arktype) |
**Built-in features**
| Package | Purpose | Docs |
| -------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------- |
| [@orpc/publisher](https://www.npmjs.com/package/@orpc/publisher) | Pub/Sub with memory, Redis, and Upstash adapters. | [Publisher](https://orpc.dev/docs/helpers/publisher) |
| [@orpc/ratelimit](https://www.npmjs.com/package/@orpc/ratelimit) | Rate limiting with memory, Redis, and Upstash adapters. | [Rate Limit](https://orpc.dev/docs/helpers/ratelimit) |
| [@orpc/experimental-lock](https://www.npmjs.com/package/@orpc/experimental-lock) | Locking with memory, Redis, and Upstash adapters. | [Lock](https://orpc.dev/docs/helpers/lock) |
| [@orpc/hibernation](https://www.npmjs.com/package/@orpc/hibernation) | Leverage Hibernation APIs like [Cloudflare's Hibernation WebSocket](https://developers.cloudflare.com/durable-objects/best-practices/websockets/#durable-objects-hibernation-websocket-api). | [Hibernation](https://orpc.dev/docs/integrations/hibernation) |
| [@orpc/json-schema](https://www.npmjs.com/package/@orpc/json-schema) | Smart coercion for OpenAPI requests. | [Smart Coercion](https://orpc.dev/docs/plugins/smart-coercion) |
**Framework & ecosystem integrations**
| Package | Purpose | Docs |
| ------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [@orpc/next](https://www.npmjs.com/package/@orpc/next) | Integrate with [Next.js Server Functions](https://nextjs.org/docs/app/getting-started/mutating-data). | [Next.js](https://orpc.dev/docs/integrations/next) |
| [@orpc/ai-sdk](https://www.npmjs.com/package/@orpc/ai-sdk) | Turn contracts and procedures into [AI SDK](https://ai-sdk.dev/) tools. | [AI SDK](https://orpc.dev/docs/integrations/ai-sdk) |
| [@orpc/mcp](https://www.npmjs.com/package/@orpc/mcp) | Expose procedures as [MCP](https://modelcontextprotocol.io/) tools. | [MCP](https://orpc.dev/docs/integrations/mcp) |
| [@orpc/tanstack-query](https://www.npmjs.com/package/@orpc/tanstack-query) | Integrate with [TanStack Query](https://tanstack.com/query/latest). | [TanStack Query](https://orpc.dev/docs/integrations/tanstack-query) |
| [@orpc/pinia-colada](https://www.npmjs.com/package/@orpc/pinia-colada) | Integrate with [Pinia Colada](https://pinia-colada.esm.dev/). | [Pinia Colada](https://orpc.dev/docs/integrations/pinia-colada) |
| [@orpc/swr](https://www.npmjs.com/package/@orpc/swr) | Integrate with [SWR](https://swr.vercel.app/). | [SWR](https://orpc.dev/docs/integrations/swr) |
| [@orpc/msw](https://www.npmjs.com/package/@orpc/msw) | Mock procedures with [Mock Service Worker](https://mswjs.io/). | [MSW](https://orpc.dev/docs/integrations/msw) |
| [@orpc/experimental-effect](https://www.npmjs.com/package/@orpc/experimental-effect) | Integrate with [Effect](https://effect.website/). | [Effect](https://orpc.dev/docs/integrations/effect) |
| [@orpc/nest](https://www.npmjs.com/package/@orpc/nest) | Implement your contract with [NestJS](https://nestjs.com/). | [NestJS](https://orpc.dev/docs/integrations/nest) |
| [@orpc/node](https://www.npmjs.com/package/@orpc/node) | [Node.js](https://nodejs.org/) plugins for static file serving and large uploads. | [Static File](https://orpc.dev/docs/plugins/static-file), [Tmp File Upload](https://orpc.dev/docs/plugins/tmp-file-upload), [Batch Response Compression](https://orpc.dev/docs/plugins/batch-response-compression) |
| [@orpc/bun](https://www.npmjs.com/package/@orpc/bun) | Adapters for [Bun's Redis](https://bun.sh/). | [Publisher](https://orpc.dev/docs/helpers/publisher), [Rate Limit](https://orpc.dev/docs/helpers/ratelimit), [Lock](https://orpc.dev/docs/helpers/lock) |
| [@orpc/cloudflare](https://www.npmjs.com/package/@orpc/cloudflare) | Adapters for [Cloudflare Workers](https://developers.cloudflare.com/workers/). | [Publisher](https://orpc.dev/docs/helpers/publisher), [Rate Limit](https://orpc.dev/docs/helpers/ratelimit), [Lock](https://orpc.dev/docs/helpers/lock), [Traces](https://orpc.dev/docs/integrations/cloudflare-traces) |
| [@orpc/trpc](https://www.npmjs.com/package/@orpc/trpc) | Reuse existing [tRPC](https://trpc.io/) routers within oRPC. | [tRPC](https://orpc.dev/docs/integrations/trpc) |
**Observability**
| Package | Purpose | Docs |
| ------------------------------------------------------------------------ | ---------------------------------------------------------------------------------- | ----------------------------------------------------------------- |
| [@orpc/opentelemetry](https://www.npmjs.com/package/@orpc/opentelemetry) | Integrate with [OpenTelemetry](https://opentelemetry.io/) for distributed tracing. | [OpenTelemetry](https://orpc.dev/docs/integrations/opentelemetry) |
| [@orpc/pino](https://www.npmjs.com/package/@orpc/pino) | Integrate with [Pino](https://getpino.io/) for logging. | [Pino](https://orpc.dev/docs/integrations/pino) |
| [@orpc/evlog](https://www.npmjs.com/package/@orpc/evlog) | Integrate with [Evlog](https://evlog.dev/) for logging. | [Evlog](https://orpc.dev/docs/integrations/evlog) |
## Sponsors
Like what we build over at [middleapi](https://github.com/middleapi)? You can help keep it going through [GitHub Sponsors](https://github.com/sponsors/dinwwwh) or [Open Collective](https://opencollective.com/middleapi). Every bit helps! 🚀
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### Organization Sponsors
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</tr>
</table>
### Backers
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<td align="center"><a href="https://github.com/rhinodavid?ref=middleapi&utm_source=middleapi&utm_medium=sponsor" target="_blank" rel="noopener sponsored" title="David Walsh"><img src="https://avatars.githubusercontent.com/u/5778036?u=b5521f07d2f88c3db2a0dae62b5f2f8357214af0&v=4" width="139" alt="David Walsh"/><br />David Walsh</a></td>
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<td align="center"><a href="https://github.com/Titoine?ref=middleapi&utm_source=middleapi&utm_medium=sponsor" target="_blank" rel="noopener sponsored" title="Titoine"><img src="https://avatars.githubusercontent.com/u/3514286?u=1bb1e86b0c99c8a1121372e56d51a177eea12191&v=4" width="139" alt="Titoine"/><br />Titoine</a></td>
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<td align="center"><a href="https://dubinets.io/?ref=middleapi&utm_source=middleapi&utm_medium=sponsor" target="_blank" rel="noopener sponsored" title="Lev Dubinets"><img src="https://avatars.githubusercontent.com/u/3114081?u=f547f5d5012cab54851f1b1ad72d10e537f78fc2&v=4" width="139" alt="Lev Dubinets"/><br />Lev Dubinets</a></td>
<td align="center"><a href="https://kellychan.im/?ref=middleapi&utm_source=middleapi&utm_medium=sponsor" target="_blank" rel="noopener sponsored" title="Kelly Peilin Chan"><img src="https://avatars.githubusercontent.com/u/520852?u=6b0f7105f694e7b5cacf410a3f04c7044b469dc8&v=4" width="139" alt="Kelly Peilin Chan"/><br />Kelly Peilin Chan</a></td>
<td align="center"><a href="https://guyariely.com/?ref=middleapi&utm_source=middleapi&utm_medium=sponsor" target="_blank" rel="noopener sponsored" title="Guy Ariely"><img src="https://avatars.githubusercontent.com/u/42813496?u=edb6b7f563bf28e160a290832e7da57c0506f8ca&v=4" width="139" alt="Guy Ariely"/><br />Guy Ariely</a></td>
<td align="center"><a href="https://paulsenon.com/?ref=middleapi&utm_source=middleapi&utm_medium=sponsor" target="_blank" rel="noopener sponsored" title="PaulSenon"><img src="https://avatars.githubusercontent.com/u/19531087?u=6385741eb91d200b8c513ec6045482e301767ca6&v=4" width="139" alt="PaulSenon"/><br />PaulSenon</a></td>
<td align="center"><a href="https://nakasyou.how/?ref=middleapi&utm_source=middleapi&utm_medium=sponsor" target="_blank" rel="noopener sponsored" title="Shotaro Nakamura"><img src="https://avatars.githubusercontent.com/u/79000684?u=f644df3f29f0e8677a90967115774564f1d9d6ab&v=4" width="139" alt="Shotaro Nakamura"/><br />Shotaro Nakamura</a></td>
</tr>
<tr>
<td align="center"><a href="https://piscis.dev/?ref=middleapi&utm_source=middleapi&utm_medium=sponsor" target="_blank" rel="noopener sponsored" title="Alex"><img src="https://avatars.githubusercontent.com/u/326163?u=b245f368bd940cf51d08c0b6bf55f8257f359437&v=4" width="139" alt="Alex"/><br />Alex</a></td>
<td align="center"><a href="https://opensource.gubanov.eu/?ref=middleapi&utm_source=middleapi&utm_medium=sponsor" target="_blank" rel="noopener sponsored" title="Andrey Gubanov"><img src="https://avatars.githubusercontent.com/u/1082083?u=c5f2daf7ebece498e85c83367bb37b4e10e2649d&v=4" width="139" alt="Andrey Gubanov"/><br />Andrey Gubanov</a></td>
</tr>
</table>
With thanks to [40 past sponsors](https://orpc.dev/sponsors#past-sponsors) who helped get oRPC here.
## Open Source Programs
[middleapi](https://github.com/middleapi) is supported by these open source programs:
<table>
<tr>
<td align="center"><a href="https://claude.com/contact-sales/claude-for-oss" target="_blank" rel="noopener" title="Claude for Open Source"><img src="https://cdn.simpleicons.org/claude" width="64" alt="Claude"/><br />Claude for Open Source</a></td>
</tr>
</table>
## References
oRPC is inspired by existing solutions that prioritize type safety and developer experience. Special acknowledgments to:
- [tRPC](https://trpc.io): For pioneering the concept of end-to-end type-safe RPC and influencing the development of type-safe APIs.
- [ts-rest](https://ts-rest.com): For its emphasis on contract-first development and OpenAPI integration, which have greatly inspired oRPC's feature set.
## License
Distributed under the MIT License. See [LICENSE](https://github.com/middleapi/orpc/blob/main/LICENSE) for more information.