68 lines
2.1 KiB
Markdown
68 lines
2.1 KiB
Markdown
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---
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title: Head
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description: Add custom elements to the `head` of your page with the built-in Head component.
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---
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We expose a built-in component for appending elements to the `head` of the page:
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```jsx
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import Head from 'next/head'
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function IndexPage() {
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return (
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<div>
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<Head>
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<title>My page title</title>
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</Head>
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<p>Hello world!</p>
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</div>
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)
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}
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export default IndexPage
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```
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## Avoid duplicated tags
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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:
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```jsx
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import Head from 'next/head'
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function IndexPage() {
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return (
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<div>
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<Head>
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<title>My page title</title>
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<meta property="og:title" content="My page title" key="title" />
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</Head>
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<Head>
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<meta property="og:title" content="My new title" key="title" />
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</Head>
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<p>Hello world!</p>
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</div>
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)
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}
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export default IndexPage
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```
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In this case only the second `<meta property="og:title" />` is rendered. `meta` tags with duplicate `key` attributes are automatically handled.
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> **Good to know**: `<title>` and `<base>` tags are automatically checked for duplicates by Next.js, so using key is not necessary for these tags.
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> 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.
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## Use minimal nesting
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`title`, `meta` or any other elements (e.g. `script`) need to be contained as **direct** children of the `Head` element,
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or wrapped into maximum one level of `<React.Fragment>` or arrays—otherwise the tags won't be correctly picked up on client-side navigations.
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## Use `next/script` for scripts
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We recommend using [`next/script`](/docs/pages/guides/scripts) in your component instead of manually creating a `<script>` in `next/head`.
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## No `html` or `body` tags
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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.
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