Frequently asked questions
- Is my data uploaded to a server?
- No. Every operation runs inside your browser using JavaScript. Nothing you paste or open is sent to our servers, stored or logged. You can disconnect from the network after the page loads and the tool keeps working.
- Does minifying change any values?
- No. Only whitespace between tokens is removed. Strings, numbers and their exact literal spelling are untouched, so the minified document parses to exactly the same data.
- How much smaller will my file get?
- It depends entirely on how it was formatted. Indented JSON commonly shrinks by 20 to 40 per cent; already-compact JSON barely changes. The status bar shows the size before and after.
Related tools
Stuck on an error?
Every common JSON parse error is explained separately, with the cause and the fix: common JSON errors.
How your data is handled
Everything happens on your device. There is no upload, no storage and no logging, and only your interface preferences - theme, indentation, font size and word wrap - are kept between visits. Closing the tab clears the document.