JSON Minifier
Remove every byte that isn't data. Minified JSON is what you want in an API response, a config value or anywhere size matters — the whitespace that makes it readable is pure overhead once it's being transmitted. The tool tells you how much you saved, and validates on the way through, so broken JSON is caught rather than silently mangled.
Nothing is uploaded — this tool runs inside your browser, so your files never leave your device.
Why use this tool
- Removes all whitespace and line breaks
- Validates the JSON as it goes — invalid input is reported, not mangled
- Shows the before and after size and the percentage saved
- Runs in your browser
How it works
- 1Paste your formatted JSON.
- 2Copy the minified result.
- 3Check the saving reported underneath.
JSON Minifier — frequently asked questions
It depends entirely on how it was formatted. Heavily indented JSON with deep nesting often drops 30–50%; JSON that was already compact may save almost nothing.
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