Setup Multilanguage with i18n and react-i18next in Next JS

Create Project with Yarn or NPX

yarn create next-app --typescript

go to “next-multilanguage” folder

edit file “next.config.js” like below

const nextConfig = {
  reactStrictMode: true,
  i18n: {
    locales: ['id', 'en'],
    defaultLocale: 'id',
    localeDetection: false
  }
}

module.exports = nextConfig

run “yarn dev” and open your browser

run “yarn add react-i18next i18next”

yarn add i18next react-i18next i18next-browser-languagedetector

create “locales” folder with “id/en” subfolder

create file i18n.ts in root folder and type like bellow

“root-project/i18.ts”

import i18n from 'i18next'
import { initReactI18next } from 'react-i18next'

import LanguageDetector from 'i18next-browser-languagedetector'


const resources = {
  en: {
    default: require('./locales/en/default.json'),
  },
  id: {
    default: require('./locales/id/default.json'),
  }
}

i18n
  
  .use(LanguageDetector)
  .use(initReactI18next)
  .init({
    
    defaultNS: 'default',
    lng: 'id',
    ns: ['default'],
    debug: false,
    interpolation: {
      escapeValue: false,
    },
    resources: resources,
  })

export default i18n

Gto to root-project/pages/_app.tsx and type

import '../styles/globals.css'
import type { AppProps } from 'next/app'
import i18n from '../i18n'
import { useRouter } from 'next/router'

function MyApp({ Component, pageProps }: AppProps) {

  const router = useRouter()
  if (router.locale) {
    i18n.changeLanguage(router.locale)
  }
  
  return <Component {...pageProps} />
}

export default MyApp

Go to root-project/index.tsx and import i18n

import type { NextPage } from 'next'
import Head from 'next/head'
import Image from 'next/image'
import styles from '../styles/Home.module.css'
import i18n from '../i18n'

const Home: NextPage = () => {
  return (
    <div className={styles.container}>
      <Head>
        <title>Create Next App</title>
        <meta name="description" content="Generated by create next app" />
        <link rel="icon" href="/favicon.ico" />
      </Head>

      <main className={styles.main}>
        <h1 className={styles.title}>
          Welcome to <a href="https://nextjs.org"> {i18n.t('test')}</a>
        </h1>

        <p className={styles.description}>
          Get started by editing{' '}
          <code className={styles.code}>pages/index.tsx</code>
        </p>

        <div className={styles.grid}>
          <a href="https://nextjs.org/docs" className={styles.card}>
            <h2>Documentation &rarr;</h2>
            <p>Find in-depth information about Next.js features and API.</p>
          </a>

          <a href="https://nextjs.org/learn" className={styles.card}>
            <h2>Learn &rarr;</h2>
            <p>Learn about Next.js in an interactive course with quizzes!</p>
          </a>

          <a
            href="https://github.com/vercel/next.js/tree/canary/examples"
            className={styles.card}
          >
            <h2>Examples &rarr;</h2>
            <p>Discover and deploy boilerplate example Next.js projects.</p>
          </a>

          <a
            href="https://vercel.com/new?utm_source=create-next-app&utm_medium=default-template&utm_campaign=create-next-app"
            className={styles.card}
          >
            <h2>Deploy &rarr;</h2>
            <p>
              Instantly deploy your Next.js site to a public URL with Vercel.
            </p>
          </a>
        </div>
      </main>

      <footer className={styles.footer}>
        <a
          href="https://vercel.com?utm_source=create-next-app&utm_medium=default-template&utm_campaign=create-next-app"
          target="_blank"
          rel="noopener noreferrer"
        >
          Powered by{' '}
          <span className={styles.logo}>
            <Image src="/vercel.svg" alt="Vercel Logo" width={72} height={16} />
          </span>
        </a>
      </footer>
    </div>
  )
}

export default Home

Open your browser