JSON Minifier
Minify JSON by removing every unnecessary space, tab and line break while keeping the data identical — processed in your browser.
JSON Minifier
Strip every unnecessary whitespace character from valid JSON.
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How to use
The whole flow runs in your browser — nothing is uploaded.
- Paste your JSONFormatted or already-compact JSON both work.
- MinifyPress Minify — the JSON is validated and reprinted without whitespace.
- Check the savingThe header shows the before/after byte counts.
- ExportCopy the compact JSON or download it as a .json file.
- Every step runs locally in your browser.
Key Features
Strip whitespace from JSON to get the smallest payload. Everything runs client-side on your own device.
- Smallest outputAll insignificant whitespace removed, nothing else changed.
- Size comparisonSee exactly how many bytes the minifier saved.
- Validated firstInvalid JSON is reported instead of being silently mangled.
- LocalNothing leaves your browser.
Frequently asked questions
No. JSON.parse followed by JSON.stringify preserves every value, key and their order — only whitespace is removed.
JavaScript keeps the last duplicate key, so such input is normalised when it is parsed. Purely valid JSON without duplicates is untouched.
Typically 10–30% smaller for indented JSON, depending on how much whitespace it contains.