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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