| --- |
| title: Head |
| description: Add custom elements to the `head` of your page with the built-in Head component. |
| --- |
|
|
| We expose a built-in component for appending elements to the `head` of the page: |
|
|
| ```jsx |
| import Head from 'next/head' |
|
|
| function IndexPage() { |
| return ( |
| <div> |
| <Head> |
| <title>My page title</title> |
| </Head> |
| <p>Hello world!</p> |
| </div> |
| ) |
| } |
|
|
| export default IndexPage |
| ``` |
|
|
| ## Avoid duplicated tags |
|
|
| To avoid duplicate tags in your `head` you can use the `key` property, which will make sure the tag is only rendered once, as in the following example: |
|
|
| ```jsx |
| import Head from 'next/head' |
|
|
| function IndexPage() { |
| return ( |
| <div> |
| <Head> |
| <title>My page title</title> |
| <meta property="og:title" content="My page title" key="title" /> |
| </Head> |
| <Head> |
| <meta property="og:title" content="My new title" key="title" /> |
| </Head> |
| <p>Hello world!</p> |
| </div> |
| ) |
| } |
|
|
| export default IndexPage |
| ``` |
|
|
| In this case only the second `<meta property="og:title" />` is rendered. `meta` tags with duplicate `key` attributes are automatically handled. |
|
|
| > **Good to know**: `<title>` and `<base>` tags are automatically checked for duplicates by Next.js, so using key is not necessary for these tags. |
|
|
| > The contents of `head` get cleared upon unmounting the component, so make sure each page completely defines what it needs in `head`, without making assumptions about what other pages added. |
|
|
| ## Use minimal nesting |
|
|
| `title`, `meta` or any other elements (e.g. `script`) need to be contained as **direct** children of the `Head` element, |
| or wrapped into maximum one level of `<React.Fragment>` or arrays—otherwise the tags won't be correctly picked up on client-side navigations. |
|
|
| ## Use `next/script` for scripts |
|
|
| We recommend using [`next/script`](/docs/pages/guides/scripts) in your component instead of manually creating a `<script>` in `next/head`. |
|
|
| ## No `html` or `body` tags |
|
|
| You **cannot** use `<Head>` to set attributes on `<html>` or `<body>` tags. This will result in an `next-head-count is missing` error. `next/head` can only handle tags inside the HTML `<head>` tag. |
|
|
