Multilingual React App Development Tutorials, Guides & Insights

Or customize promotions, payment options, and availability by locale.

In 2025, users expect more than just language translation — they want your app to feel native to their region, culture, and behavior.

Create a new file: src/i18n.js

import i18n from 'i18next';
import { initReactI18next } from 'react-i18next';
import LanguageDetector from 'i18next-browser-languagedetector';

// Import translation files
import en from './locales/en.json';
import fr from './locales/fr.json';

i18n
  .use(LanguageDetector) // Detects user language
  .use(initReactI18next)
  .init({
    resources: {
      en: { translation: en },
      fr: { translation: fr },
    },
    fallbackLng: 'en',
    interpolation: {
      escapeValue: false, // React already escapes
    },
    detection: {
      order: ['localStorage', 'navigator', 'htmlTag'],
      caches: ['localStorage'],
    },
  });

export default i18n;