React Native i18n: A Practical Guide to Multi-Language Mobile Apps

Most i18n bugs in React Native apps trace back to two decisions made early: hardcoding strings, and using string concatenation to build sentences. Both feel fine when you're shipping in English. Both are catastrophic the day you add a second locale.

This is the practical playbook I wish I had when I first added Spanish, Japanese, and Arabic to a React Native app: which library to pick, the patterns that scale, and the traps that only show up in production.

TL;DR

Use i18next + react-i18next + expo-localization (or react-native-localize on bare RN).

Never hardcode strings, never concatenate to build sentences.

Use ICU pluralization — count === 1 ?…