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Detecting missing and unused i18next translation keys in a React project

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A translation key is just a string that points to a JSON entry, so nothing by default confirms it exists in every locale. The author describes how a missing key can leave users seeing raw key names, or silently fall back to English without anyone noticing. A jq-based diff script can compare key paths between locale files, though it needs to run per namespace and per locale and cannot reliably detect unused keys. For day-to-day work, the author built I18n Support Plus, an open-source MIT plugin for JetBrains IDEs that flags keys by locale coverage and shows values inline. The article is written by the plugin's maintainer, which the author notes openly.

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