If you’ve tried adding multiple languages to a Next.js app, you know it can be a pain: * Big JSON files full of keys * Forgetting to add a translation * Config that makes no sense Here are the 3 main options people use: next-intl – super simple, small, works fine if your app isn’t too big. next-i18next – lots of features, lots of plugins, but setup is heavy and the config can get messy. Intlayer – new option, made for modern Next.js (App Router, Server Components).