JSON Formatter
Format and indent valid JSON in your browser, with downloadable output and clear syntax errors.
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How to use JSON Formatter
Turn compact JSON into readable, consistently indented data. Arrays, objects, Unicode, and primitive JSON values stay on your device.
- Paste a JSON document.
- Choose an indentation style and run the formatter.
- Copy the formatted result or download the JSON file.
Good to know
- Standard JSON only: comments, trailing commas, and unquoted keys are invalid.
- Up to 200,000 input characters, 20,000 values, and 60 nesting levels.
- JSON numbers use JavaScript precision; keep large identifiers as strings. Duplicate object keys retain their last value.
Common questions
Is the JSON uploaded?
No. Parsing and formatting run inside your browser.
Will this preserve the original whitespace?
No. Whitespace is replaced by the selected indentation, and number spelling may be normalized.
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