Internationalization and Localization Patterns

Overview

Hardcoded strings, binary plural logic, and locale-less date formatting create invisible bugs that only surface when users switch languages or regions. Use this guide when building new features that display user-visible text, numbers, dates, or currency — and during code review to catch i18n defects before they ship.

When to use: Any feature that renders text, numbers, dates, times, or currency to users; reviewing components for hardcoded strings; evaluating plural and date formatting logic; adding RTL language support; designing translation workflows.

Quick Reference