JSON Formatter/Validator
Paste any JSON to instantly format it with proper indentation, minify it to a single line, or catch syntax errors with the exact position of the problem — all validated using JavaScript's own JSON.parse, entirely in your browser.
How to use
- Paste or type JSON into the input box.
- Format (pretty-print) or Minify — the output updates instantly.
- If the JSON is invalid, the exact error and character position are shown instead.
- Copy the result with one click.
FAQ
Why does it say my JSON is invalid?
The error message comes directly from JavaScript's own JSON.parse — the same parser your code uses — so if it's flagged here, it will fail the same way in your app. The message usually points at the exact character position of the problem.
What's the difference between format and minify?
Format adds indentation and line breaks for readability; minify strips all unnecessary whitespace to produce the smallest possible size — useful for production payloads or embedding JSON in a URL.
Is my data sent anywhere?
No — parsing and formatting both happen locally in your browser via JSON.parse/JSON.stringify. Nothing is uploaded.