How to Use the JSON Formatter & Validator
- Paste your JSON into the input box.
- Click Format to indent it, or Minify to compact it.
- If there's a syntax error, read the message to locate the issue.
- Copy the formatted result.
What formatting and validating JSON does
A JSON formatter takes messy or minified JSON and pretty-prints it with consistent indentation, so nested structures become readable at a glance. It also validates as it goes, flagging exactly where the syntax breaks.
That makes it invaluable for inspecting an API response, cleaning up a config file, or checking data before you paste it into code.
Common mistakes it catches
JSON is strict, and small slips break it: a trailing comma after the last item, single quotes instead of double, missing quotes around keys, or an unmatched bracket. A validator points to the problem instead of leaving you to hunt for it.
Everything runs in your browser, so whatever you paste stays on your device. You can also minify JSON here to strip whitespace when you need the smallest possible payload.
Frequently Asked Questions
Does it validate my JSON?
Yes. If the JSON is malformed, the tool shows an error describing the problem so you can fix it quickly.
Is my data sent anywhere?
No. All parsing and formatting happens in your browser, your JSON never leaves your device, which matters for sensitive data.
What's the difference between format and minify?
Formatting adds indentation and line breaks for readability; minifying removes all unnecessary whitespace to make the smallest possible payload.