JSON Minifier
Strip whitespace from JSON to get the smallest valid output — free, instant and private. Everything runs in your browser; nothing is uploaded.
100% in your browser — your data never leaves your device.
How to minify JSON
- Paste your JSON into the input box on the left.
- It is parsed and re-serialised with no whitespace in the output panel.
- If the JSON is invalid, the error message and position appear below so you can fix it first.
- Click Copy to put the minified JSON on your clipboard.
Why minify JSON?
Formatted JSON is great for reading, but the extra whitespace adds up over large payloads. Minifying strips it out to produce the smallest valid document, which means quicker transfers and smaller files — without touching the data itself.
Frequently asked questions
- Is my JSON uploaded anywhere?
- No. Minifying runs locally in your browser with the native JSON parser. Nothing is sent to a server.
- What does minifying remove?
- All insignificant whitespace — indentation, line breaks and spaces between tokens. The data itself is unchanged, just packed into the smallest valid form.
- Why minify JSON?
- Smaller JSON means less bandwidth and faster loading. It is handy for API payloads, config embedded in code, and anywhere file size matters.
- Is minified JSON still valid?
- Yes. Whitespace is not significant in JSON, so a minified document parses exactly the same as its formatted version.