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React i18n Libraries | Translation Guide
May 20, 2026 · 5 min read
String replace is not i18n. You need plurals, dates, and a workflow for translators. Here is how the main React libraries differ.
Message format matters
i18next is the common default. FormatJS (react-intl) is strict about ICU messages. Framework kits like next-intl tie locale to routing.
Extract strings early. Late extraction is how you ship mixed languages.
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