React i18n break lines in JSON String

Question

You can do it with css white-space: pre-line; & \n in the translation text.

const root = document.getElementById('root');

i18next.init({
  lng: 'en',
  resources: {
    en: {
      translation: {
        "key": "Hello world\nThis sentence should appear on the second line"
        // ----------------^ new line char
      }
    }
  }
}, function(err, t) {
  // initialized and ready to go!
  root.innerHTML = i18next.t('key');
});

#root {
  white-space: pre-line;
}

<script src="https://unpkg.com/i18next@15.0.9/dist/umd/i18next.min.js"></script>

<div id="root"></div>

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