JSON Formatter & Validator
Beautify, indent and validate JSON in your browser. Spot errors instantly — nothing is uploaded.
Enter values to see the result.
About the JSON Formatter & Validator
Minified or messy JSON is hard to read and debug. Paste it here to pretty-print it with clean indentation, or instantly find out exactly where it's invalid. You can also minify JSON to its smallest size.
How to use it
- Paste your JSON into the box.
- Pick an indent size, or choose Minify.
- See the formatted JSON, or a clear error if it's invalid.
- Copy the result for your code or config.
Developers and API users use this to read responses, fix config files and validate payloads. It all happens in your browser, so sensitive data in your JSON never leaves your device.
Frequently asked questions
Does it validate JSON?
Yes. If your JSON is invalid, it shows the parser's error message so you can find and fix the problem.
Can it minify JSON?
Yes. Choose the Minify option to strip all whitespace and produce the smallest valid JSON.
Is my JSON sent anywhere?
No. Parsing and formatting happen entirely in your browser — nothing is uploaded, so it's safe for sensitive data.
Why does it say my JSON is invalid?
Common causes are trailing commas, single quotes instead of double quotes, or unquoted keys. The error message points to where parsing failed.