All tools
JSON Formatter & Validator
Paste JSON to pretty-print, validate, or minify it. Everything runs in your browser, perfect for sensitive data.
🔒 Fully private, your JSON is processed entirely on your device and never uploaded to any server.
Format, validate, and minify JSON in your browser. Because it runs entirely on your device, it's safe for sensitive data, nothing is uploaded.
How to use
- Paste your JSON.
- Tap Format/Validate to pretty-print it, or Minify to compress it.
- Copy the result; errors are shown if the JSON is invalid.
Frequently asked questions
Is it safe to paste sensitive JSON here?
Yes, unlike many online formatters, this one processes everything in your browser and never sends your data to a server.
What does it do with invalid JSON?
It shows the parser's error message so you can find and fix the problem.
What's the difference between format and minify?
Format pretty-prints with indentation for readability; minify strips whitespace to make the JSON as small as possible.