How to set HTML lang attribute dynamically on NextJs Document?

Question

I believe the best solution here is to use a custom ./pages/_document.js file and override the document itself.

import Document, { Html, Head, Main, NextScript } from 'next/document'

class MyDocument extends Document {
  static async getInitialProps(ctx) {
    const initialProps = await Document.getInitialProps(ctx)
    return { ...initialProps }
  }

  render() {
    return (
      <Html lang="en">
        <Head />
        <body>
          <Main />
          <NextScript />
        </body>
      </Html>
    )
  }
}

export default MyDocument

More explanation can be found here: https://nextjs.org/docs/advanced-features/custom-document

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