Multilingual React App Development Tutorials, Guides & Insights

• Use language-based subpaths: /en, /fr, /ar
• Generate hreflang tags for each locale
• Translate meta tags: <title>, <meta description>
• Avoid client-only routing for indexable pages
• Pre-render pages via SSR (e.g., with Next.js)

Use IP detection (via backend or service like IPinfo):

import ICU from 'i18next-icu';

i18n
  .use(ICU) // Enables datetime and currency formatting
  .use(LanguageDetector)
  .use(initReactI18next)
  .init({
    ...
    interpolation: {
      format: (value, format, lng) => {
        if (format === 'datetime') {
          return new Intl.DateTimeFormat(lng).format(value);
        }
        if (format === 'currency') {
          return new Intl.NumberFormat(lng, {
            style: 'currency',
            currency: lng === 'fr' ? 'EUR' : 'USD',
          }).format(value);
        }
        return value;
      },
    }
  });

In large apps, structure your translation files modularly: