JSON Formatter & Validator

Paste any JSON to pretty-print, validate and minify it. Get clear error messages with line numbers when your JSON is invalid.

Input

Formatted output

{
  "hello": "world",
  "n": 42,
  "list": [
    1,
    2,
    3
  ]
}

Ad space

Frequently asked questions

Is this JSON formatter free to use?+

Yes, the JSON Formatter & Validator is completely free with no usage limits.

Does my JSON get uploaded to a server?+

No. Parsing and formatting happen entirely in your browser using JavaScript. Your JSON never leaves your device.

Can it fix invalid JSON automatically?+

No, it validates and shows you exactly where the syntax error is so you can fix it, rather than guessing at a "fix."