How to support multiple languages and locales in a Next.js app?

How to support multiple languages and locales in a Next.js app?

Adding support for multiple languages and locales in a Next.js application involves several steps, including setting up internationalization libraries, managing translations, and implementing language-switching functionality. Below is an example of how you can achieve this:

  1. Install Required Packages:

    First, you need to install the necessary packages. You can use libraries like next-i18next for internationalization support in Next.js.

     npm install next-i18next i18next i18next-browser-languagedetector
  2. Set Up Configuration:

    Create a next.config.js file in the root of your project to configure Next.js to use the i18next translation system.

     // next.config.js
     const { i18n } = require('./next-i18next.config');
     module.exports = {

    Create a next-i18next.config.js file to configure i18next.

     // next-i18next.config.js
     const { i18n } = require('i18next');
     const { initReactI18next } = require('react-i18next');
     const Backend = require('i18next-http-backend');
     const NextI18Next = require('next-i18next').default;
     module.exports = new NextI18Next({
       defaultLanguage: 'en',
       otherLanguages: ['fr'], // Add more languages as needed
       localePath: typeof window === 'undefined' ? 'public/locales' : 'locales',
       ns: ['common'],
       defaultNS: 'common',
       keySeparator: false,
       backend: {
         loadPath: '/locales/{{lng}}/{{ns}}.json',
  3. Create Translation Files:

    Inside your project directory, create a public/locales folder. Within this folder, create subfolders for each language (e.g., en for English, fr for French). In each language folder, create JSON files with translations.

    For example:

     // public/locales/en/common.json
       "welcome": "Welcome to our website!",
       "about": "About Us",
       "contact": "Contact Us"
     // public/locales/fr/common.json
       "welcome": "Bienvenue sur notre site Web!",
       "about": "À Propos",
       "contact": "Contactez-nous"
  4. Implement Language Switching:

    You can create a language switcher component to allow users to switch between languages. Here's a simple example using React and next/router:

     import { useRouter } from 'next/router';
     import { i18n } from 'next-i18next';
     const LanguageSwitcher = () => {
       const router = useRouter();
       const changeLanguage = (language) => {
         router.push(router.pathname, router.asPath, { locale: language });
       return (
           <button onClick={() => changeLanguage('en')}>English</button>
           <button onClick={() => changeLanguage('fr')}>French</button>
     export default LanguageSwitcher;
  5. Use Translations in Your Components:

    Finally, use the useTranslation hook provided by next-i18next to access translations in your components:

     import { useTranslation } from 'next-i18next';
     const HomePage = () => {
       const { t } = useTranslation('common');
       return (
     export default HomePage;

    This component will display the translated text based on the current language selected by the user.

This is a simple example of how to support multiple languages and locales in a Next.js app. You can build on this by adding more languages, handling dynamic content, and improving the user experience based on language choices.

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