Javascript Programming Tutorials, Guides & Best Practices

Install necessary dependencies:

npm install react-router-dom i18next react-i18next i18next-browser-languagedetector

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;

Use a centralized approach for auth tokens and route management — or pass them via shared context if needed.

• Autonomous teams & deployments
• Tech stack flexibility
• Improved scalability
• Faster build times for individual apps

You can persist state to localStorage or sessionStorage:

import create from 'zustand';
import { persist } from 'zustand/middleware';

const useStore = create(persist(
  (set) => ({
    count: 0,
    increase: () => set((state) => ({ count: state.count + 1 })),
  }),
  {
    name: 'counter-storage',
  }
));