How to Preserve Placeholders in JSON Translations

Keep runtime variables intact while still moving quickly through localization work

JSON Translate TeamMay 16, 20266 min readUpdated May 16, 2026
#placeholders#variables#json translation#qa#localization

Why placeholders break so often

Placeholders are easy for translators and models to misread because they look like natural language fragments. If {{name}}, {{count}}, or %s changes shape, the translated string can fail at runtime.

A safer review workflow

  • Identify placeholder formats used in your app before translation starts.
  • Protect adjacent product terms that often get mistranslated together with variables.
  • Review translated output with diff highlighting turned on.
  • Test the translated strings inside the application, not just in a JSON editor.

What to check before release

  • Every placeholder still exists in the translated value.
  • Spacing and punctuation around tokens still read naturally in the target language.
  • Plural and count-based messages still make sense with real numbers.
  • No HTML or markdown-like fragments were rewritten unexpectedly.

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