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108 lines
2.7 KiB
Markdown
108 lines
2.7 KiB
Markdown
---
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icon: IconDirectory
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title: server
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head.title: Server directory
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---
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# Server directory
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Nuxt uses the `server/` directory to create any backend logic for your application. It supports HMR and powerful features.
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The `server/` directory contains API endpoints and server middleware for your project.
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## API Routes
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Nuxt will automatically read in any files in the `~/server/api` directory to create API endpoints.
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Each file should export a default function that handles API requests. It can return a promise or JSON data directly (or use `res.end()`).
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### Examples
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#### Hello world
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```js [server/api/hello.ts]
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export default (req, res) => 'Hello World'
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```
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See the result on <http://localhost:3000/api/hello>.
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#### Async function
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```js [server/api/async.ts]
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export default async (req, res) => {
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await someAsyncFunction()
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return {
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someData: true
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}
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}
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```
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**Example:** Using Node.js style
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```ts [server/api/node.ts]
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import type { IncomingMessage, ServerResponse } from 'http'
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export default async (req: IncomingMessage, res: ServerResponse) => {
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res.statusCode = 200
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res.end('Works!')
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}
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```
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#### Accessing req data
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```js
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import { useBody, useCookies, useQuery } from 'h3'
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export default async (req, res) => {
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const query = useQuery(req)
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const body = await useBody(req) // only for POST request
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const cookies = useCookies(req)
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return { query, body, cookies }
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}
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```
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Learn more about [h3 methods](https://www.jsdocs.io/package/h3#package-index-functions).
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## Server Middleware
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Nuxt will automatically read in any files in the `~/server/middleware` to create server middleware for your project.
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These files will be run on every request, unlike [API routes](#api-routes) that are mapped to their own routes. This is typically so you can add a common header to all responses, log responses or modify the incoming request object for later use in the request chain.
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Each file should export a default function that will handle a request.
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```js
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export default async (req, res) => {
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req.someValue = true
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}
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```
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There is nothing different about the `req`/`res` objects, so typing them is straightforward.
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```ts
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import type { IncomingMessage, ServerResponse } from 'http'
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export default async (req: IncomingMessage, res: ServerResponse) => {
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req.someValue = true
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}
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```
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To pass the request deeper into the application, you can `return` inside the function:
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```js
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export default async (req, res) => {
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const isNotHandledByThisMiddleware = req.url.includes('/some-unhandled-url-path/')
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if(isNotHandledByThisMiddleware) {
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return
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}
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// Actual logic here
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}
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```
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::alert{type=info icon=🔎}
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Find more information about custom middleware in the documentation for [nuxt.config.js](/docs/directory-structure/nuxt.config#servermiddleware)
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::
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