Free tool · i18n

Find missing keys in your locale files

A missing key means English showing up on your French page, or a blank label in production. Paste your source file and each locale file below. The check lists every key in the source that is absent or empty in a locale, plus keys the locale has that the source does not. It runs in your browser: nothing is uploaded or stored.

Source file, the language you write in (e.g. en.json)

Locale files, one per language (e.g. fr.json)

This check covers JSON files with nested keys. Finding missing keys once is fine; finding them on every push, translated and opened as a pull request, is what Verba does. The guide on auto-translating new i18n keys on every push compares the four ways to automate it.