vercel/next.js / errors / no-document-viewport-meta.mdx

---

title: 'Viewport meta tags should not be used in _document.js <Head>'

Why This Error Occurred

Adding <meta name="viewport" ...> in pages/_document.js will lead to unexpected results since it cannot be deduped. The viewport tag should be handled by next/head in pages/_app.js.

Possible Ways to Fix It

Set your viewport meta tag in pages/_app.js instead:

import Head from 'next/head'

function MyApp({ Component, pageProps }) {
  return (
    <>
      <Head>
        <meta name="viewport" content="viewport-fit=cover" />
      </Head>
      <Component {...pageProps} />
    </>
  )
}

export default MyApp

Useful Links

• Issue #13230, which led to the creation of this warning.