📝 TIL: Next.js 15 App Router + cookie-based i18n Instead of /en/ and /zh/ URL prefixes, I use a single URL with a locale cookie. Server components read the cookie and render the correct language. Pros: No route duplication, clean URLs Cons: Can't have language-specific URLs for SEO For a dev community with <1000 users, this tradeoff is worth it. #nextjs #i18n #webdev