React Programming Tutorials, Guides & Best Practices

With this setup, your app can:

• Dynamically switch between translated URLs
• Support SEO-friendly, localized routing
• Scale to additional languages easily

Red = luck in China, danger in the West.

• Adapt units and metrics

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;

Create folder structure:

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',
  }
));

Zustand allows you to select specific parts of the state to prevent unnecessary re-renders:

   const value = useMemo(() => ({ user, setUser }), [user]);

   const increment = useCallback(() => setCount(c => c + 1), []);