February 19, 2023

Adding lang attribute to html tag in Next.js

The lang attribute in HTML specifies the language of the content of a web page. It is important to have the lang attribute set correctly on a web page for the following reasons:

Accessibility: The lang attribute helps screen readers and other assistive technologies identify the language of the content and read it correctly for users with different languages and reading preferences.

SEO (Search Engine Optimization): Search engines use the lang attribute to identify the language of the content of a web page. This helps them to provide more accurate search results for users searching in specific languages.

Translation: The lang attribute can also help translation tools and services to identify the language of the content and translate it correctly, which can be useful for websites with international audiences.

Localization: The lang attribute is an important part of internationalization and localization efforts. By setting the lang attribute correctly, web developers can ensure that their content is displayed correctly for users in different regions and with different language preferences.

To add the lang attribute to the HTML tag in Next.js, you can add the attribute to the Document component. Here's how you can do it:

Create a custom Document component if you don't already have one. To do this, create a new file called _document.js in the pages directory (if it doesn't exist already) and add the following code:

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

class MyDocument extends Document {
  render() {
    return (
      <Html lang="en">
        <Head />
          <Main />
          <NextScript />

export default MyDocument

or add i18n to your next.config.js file:

module.exports = {
  i18n: {
    locales: ['en'],
    defaultLocale: 'en',