---
title: TypeScript Hono OpenAPI
description: This guide shows how to publish an OpenAPI service to Agentic using TypeScript and Hono's OpenAPI support.
---

[Hono](https://hono.dev) is a popular open source TypeScript framework for building HTTP servers, and [`@hono/zod-openapi`](https://hono.dev/examples/zod-openapi) is an excellent solution for creating an auto-generated OpenAPI spec from your Hono routes.

## 1. Install dependencies

<Info>
  **Prerequisite**: Please install [Node.js](https://nodejs.org) before
  proceeding.
</Info>

<CodeGroup>

```bash npm
npm add hono @hono/node-server @hono/zod-openapi zod
```

```bash pnpm
pnpm add hono @hono/node-server @hono/zod-openapi zod
```

```bash bun
bun add hono @hono/node-server @hono/zod-openapi zod
```

```bash yarn
yarn add hono @hono/node-server @hono/zod-openapi zod
```

</CodeGroup>

## 2. Create a Hono OpenAPI Node.js server

```ts server.ts
import { serve } from '@hono/node-server'
import { createRoute, OpenAPIHono, z } from '@hono/zod-openapi'
import { logger } from 'hono/logger'

const app = new OpenAPIHono()
app.use(logger())

const echoRoute = createRoute({
  description: 'Echoes the request body',
  // The OpenAPI `operationId` will be used as the tool name in Agentic
  operationId: 'echo',
  method: 'post',
  path: '/echo',
  request: {
    body: {
      content: {
        'application/json': {
          schema: z.object({}).passthrough()
        }
      }
    }
  },
  responses: {
    200: {
      description: 'Echoed request body',
      content: {
        'application/json': {
          schema: z.object({}).passthrough()
        }
      }
    }
  }
})

return app.openapi(echoRoute, async (c) => {
  return c.json(c.req.valid('json'))
})

app.doc31('/docs', {
  openapi: '3.1.0',
  info: {
    title: 'Example',
    description: 'Example description',
    version: '0.0.1'
  }
})

serve({ fetch: app.fetch, port: 8787 })
```

Note that the auto-generated OpenAPI spec will be available at `/docs` in this example.

<Tip>
  Hono is really flexible, so if you'd rather deploy your server to Cloudflare
  Workers instead of using Node.js (or any other platform), just follow [Hono's
  docs](https://hono.dev/docs/getting-started/basic).
</Tip>

## 3. Deploy your OpenAPI server remotely

Deploy your server publicly or use a tool like [ngrok](https://ngrok.com) to expose it to the internet.

<Warning>
  Tools like `ngrok` expose your unauthenticated server to the internet. Only
  run this command in a safe environment if you understand the risks.
</Warning>

We recommend deploying your server to a cloud provider like [Cloudflare Workers](https://workers.cloudflare.com), [Vercel](https://vercel.com/guides/hosting-backend-apis) (for instance, using the [Hono](https://vercel.com/templates/hono/hono-on-vercel) API template), [Render](https://render.com/docs/deploy-fastapi), [Porter](https://docs.porter.run/guides/nodejs/deploy-nodejs), or [Fly.io](https://fly.io/docs/python/frameworks/fastapi/). Or one of the big boys [AWS](https://aws.amazon.com), [GCP](https://cloud.google.com), or [Azure](https://azure.microsoft.com).

## 4. Deploy your origin OpenAPI service to Agentic

Now that you have a publicly available MCP server, you can follow the [existing OpenAPI server guide](/publishing/guides/existing-openapi-service) to deploy it to Agentic.
