JSON Formatter
Format, validate and minify JSON online. Paste your JSON and get clean, indented output with clear error messages.
Your JSON is processed entirely in your browser. Nothing is uploaded to a server.
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How to use this tool
- 1Paste or type your JSON into the input box.
- 2Your JSON is validated automatically as you type, showing the exact line and column of any error.
- 3Click Format to pretty-print it with indentation, or Minify to compact it onto one line.
- 4Copy the result or download it as a .json file.
Features
- Automatic validation as you type, with line and column for errors.
- Format: pretty-print JSON with 2-space indentation.
- Minify: compact JSON onto a single line.
- Copy result to clipboard, or download as a .json file.
- Handles large JSON without freezing the page (validation is debounced).
- No account or sign-up required.
Privacy
Your JSON is processed entirely in your browser. It is never sent to a server, logged or stored.
Frequently asked questions
Is this JSON formatter free?
Yes. You can format, validate and minify unlimited JSON for free, with no sign-up required.
What happens if my JSON is invalid?
You'll see the parser's error message along with the exact line and column where the problem starts, so you can find and fix it quickly.
What's the difference between Format and Minify?
Format adds indentation and line breaks to make JSON easier to read. Minify removes all unnecessary whitespace to make the file as small as possible.
Is my JSON data sent to a server?
No. Formatting, validating and minifying all happen locally in your browser using the JSON built into JavaScript.
Is there a size limit?
There's no hard limit, but very large JSON files (tens of megabytes) may be slow to process since everything runs in your browser tab rather than on a server.