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# Zod OpenAPI Hono
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**Zod OpenAPI Hono** is extending Hono to support OpenAPI.
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With it, you can validate values and types using [**Zod**](https://zod.dev/) and generate OpenAPI Swagger documentation.
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This is based on [**Zod to OpenAPI**](https://github.com/asteasolutions/zod-to-openapi).
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For details on creating schemas and defining routes, please refer to this resource.
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**Zod OpenAPI Hono** is an extended Hono class that supports OpenAPI. With it, you can validate values and types using [**Zod**](https://zod.dev/) and generate OpenAPI Swagger documentation. This is based on [**Zod to OpenAPI**](https://github.com/asteasolutions/zod-to-openapi) (thanks a lot!). For details on creating schemas and defining routes, please refer to [the "Zod to OpenAPI" resource](https://github.com/asteasolutions/zod-to-openapi).
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_This is not a real middleware but hosted on this monorepo._
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_Note: This is not standalone middleware but is hosted on the monorepo "[github.com/honojs/middleware](https://github.com/honojs/middleware)"._
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## Limitations
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- Currently, it does not support validation of _headers_ and _cookies_.
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- An instance of Zod OpenAPI Hono cannot be used as a "subApp" in conjunction with `rootApp.route('/api', subApp)`.
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## Usage
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### Installation
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You can install it via the npm. Should be installed with `hono` and `zod`.
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You can install it via npm. It should be installed alongside `hono` and `zod`.
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```sh
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npm i hono zod @hono/zod-openapi
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@ -19,9 +21,9 @@ npm i hono zod @hono/zod-openapi
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### Basic Usage
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#### Write your application
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#### Setting up your application
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First, define schemas with Zod:
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First, define your schemas with Zod. The `z` object should be imported from `@hono/zod-openapi`:
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```ts
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import { z } from '@hono/zod-openapi'
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@ -54,7 +56,7 @@ const UserSchema = z
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.openapi('User')
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```
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Next, create routes:
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Next, create a route:
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```ts
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import { createRoute } from '@hono/zod-openapi'
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@ -72,13 +74,13 @@ const route = createRoute({
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schema: UserSchema,
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},
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},
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description: 'Get the user',
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description: 'Retrieve the user',
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},
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},
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})
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```
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Finally, create the App:
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Finally, set up the app:
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```ts
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import { OpenAPIHono } from '@hono/zod-openapi'
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@ -94,7 +96,7 @@ app.openapi(route, (c) => {
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})
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})
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// OpenAPI document will be served on /doc
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// The OpenAPI documentation will be available at /doc
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app.doc('/doc', {
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openapi: '3.0.0',
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info: {
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@ -104,11 +106,17 @@ app.doc('/doc', {
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})
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```
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### Handling validation errors
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You can start your app just like you would with Hono. For Cloudflare Workers and Bun, use this entry point:
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You can handle the validation errors the following ways.
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```ts
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export default app
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```
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Define the schema:
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### Handling Validation Errors
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Validation errors can be handled as follows:
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First, define the error schema:
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```ts
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const ErrorSchema = z.object({
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@ -121,7 +129,7 @@ const ErrorSchema = z.object({
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})
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```
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Add the response:
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Then, add the error response:
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```ts
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const route = createRoute({
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schema: ErrorSchema,
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},
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},
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description: 'Return Error!',
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description: 'Returns an error',
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},
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},
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})
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```
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Add the hook:
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Finally, add the hook:
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```ts
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app.openapi(
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return c.jsonT(
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{
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code: 400,
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message: 'Validation Error!',
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message: 'Validation Error',
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},
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400
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)
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### Middleware
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You can use Hono's middleware as same as using Hono because Zod OpenAPI is just extending Hono.
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Zod OpenAPI Hono is an extension of Hono, so you can use Hono's middleware in the same way:
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```ts
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import { prettyJSON } from 'hono/pretty-json'
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app.use('/doc/*', prettyJSON())
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```
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### RPC-mode
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### RPC Mode
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Zod OpenAPI Hono supports Hono's RPC-mode. You can create the types for passing Hono Client:
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Zod OpenAPI Hono supports Hono's RPC mode. You can define types for the Hono Client as follows:
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```ts
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import { hc } from 'hono/client'
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@ -177,10 +177,9 @@ describe('Query', () => {
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}),
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})
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const PostsSchema = z
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const BooksSchema = z
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.object({
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title: z.string().openapi({}),
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content: z.string().openapi({}),
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titles: z.array(z.string().openapi({})),
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page: z.number().openapi({}),
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})
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.openapi('Post')
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200: {
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content: {
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'application/json': {
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schema: PostsSchema,
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schema: BooksSchema,
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},
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},
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description: 'Get the posts',
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description: 'Get books',
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},
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},
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})
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app.openapi(route, (c) => {
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const { page } = c.req.valid('query')
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return c.jsonT({
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title: 'Good title',
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content: 'Good content',
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titles: ['Good title'],
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page: Number(page),
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})
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})
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const res = await app.request('/books?page=123')
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expect(res.status).toBe(200)
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expect(await res.json()).toEqual({
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title: 'Good title',
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content: 'Good content',
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titles: ['Good title'],
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page: 123,
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})
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})
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title: z.string().openapi({}),
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})
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const PostsSchema = z
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const PostSchema = z
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.object({
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id: z.number().openapi({}),
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title: z.string().openapi({}),
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200: {
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content: {
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'application/json': {
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schema: PostsSchema,
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schema: PostSchema,
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},
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},
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description: 'Get the posts',
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description: 'Post a post',
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},
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},
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})
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headers: {
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'Content-Type': 'application/json',
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},
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body: JSON.stringify({}),
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})
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const res = await app.request(req)
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expect(res.status).toBe(400)
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title: z.string().openapi({}),
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})
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const PostsSchema = z
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const PostSchema = z
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.object({
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id: z.number().openapi({}),
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title: z.string().openapi({}),
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200: {
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content: {
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'application/json': {
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schema: PostsSchema,
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schema: PostSchema,
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},
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},
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description: 'Post the post',
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description: 'Post a post',
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},
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},
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})
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title: z.string().openapi({}),
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})
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const PostsSchema = z
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const PostSchema = z
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.object({
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id: z.number().openapi({}),
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message: z.string().openapi({}),
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200: {
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content: {
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'application/json': {
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schema: PostsSchema,
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schema: PostSchema,
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},
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},
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description: 'Post the post',
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description: 'Post a post',
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},
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},
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})
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