JSON Formatter
Format, validate, and minify JSON instantly. Free and private. Everything runs in your browser; your data is never uploaded.
Paste in messy, minified, or broken JSON, from an API response, a log line, or a config file, and get it back cleanly indented, validated for syntax errors, or squeezed down to a single minified line.
How to use it
- Paste or type your JSON into the input box
- Click Format to beautify it (or Minify to compress it)
- Copy the result or fix any syntax errors it flags
Frequently asked questions
- Does my JSON data get uploaded anywhere?
- No. Formatting, validating, and minifying all happen locally in your browser. The JSON never leaves your device, which makes it safe for API keys, internal payloads, or anything else you'd rather not paste into a random server.
- What happens if my JSON has a syntax error?
- The tool points to the exact line and character where parsing failed (e.g. a trailing comma, an unquoted key, or a missing bracket) so you can fix it instead of hunting through a wall of unformatted text.
- What's the difference between formatting and minifying?
- Formatting adds indentation and line breaks so nested objects and arrays are easy to read; minifying strips all whitespace to produce the smallest possible payload for sending over the wire or storing.
- 1
Nothing is uploaded
The file never leaves your device. There is no server to send it to, so there is nothing to leak, log, or subpoena.
- 2
No signup, no limits
No account, no email, no daily cap, no watermark, and no paid tier waiting behind the third file.
- 3
Works offline
Load the page once and it keeps working with the network off, because all the work was always happening locally.