JSON Formatter

Formatting only changes whitespace, never your data. If the JSON is invalid, the tool shows the parser’s error message and position instead of producing output.

The tool parses your input with the browser’s native JSON engine. Valid JSON is re-serialised with your chosen indentation for formatting, or with no whitespace for minifying.

The input {"a":1,"b":[2,3]} formatted with 2 spaces becomes a clean, indented, multi-line structure that is easy to read and review.

1. Paste your JSON into the input box.
2. Choose your preferred indentation.
3. Press Format to beautify, or use Minify and Validate.

• Using single quotes — JSON requires double quotes around keys and strings.
• Leaving a trailing comma after the last item.
• Pasting JavaScript objects with unquoted keys.

The JSON Formatter cleans up messy JSON, validates that it is well formed and can compress it to a single line. It reports the exact location of syntax errors so you can fix them fast.