JSON Formatter, Minifier & Validator
Format, beautify, validate or minify JSON in your browser. Choose indentation, sort nested object keys and preserve large integers without rounding.
Your result will appear here.
How to format, validate or minify JSON
- Paste a JSON document, such as an API response or a configuration.
- Choose Format for readable indentation, Minify for compact output, or Validate to check syntax.
- Set indentation or key sorting as needed, then copy or download the result.
Working with JSON Formatter, Minifier & Validator
Formatting preserves numeric literals, including integers beyond JavaScript’s safe-number range. Comments and trailing commas are rejected. Duplicate object keys are reported so that formatting cannot silently discard a value.
JSON formatting example: a large integer stays exact
- Input
{"message":"Hello, world! 👋","id":9007199254740993,"enabled":true}- Result
{ "message": "Hello, world! 👋", "id": 9007199254740993, "enabled": true }
Questions about JSON Formatter, Minifier & Validator
What is the difference between formatting and minifying JSON?
Formatting adds indentation and line breaks for reading. Minifying removes unnecessary whitespace outside strings. Neither operation is intended to change your values; spaces inside strings are preserved.
Will large JSON integers lose precision?
This formatter preserves numeric literals, including 9007199254740993, without converting them to JavaScript numbers. That avoids rounding identifiers beyond the safe integer range.
Why is my JSON invalid?
Common causes include single quotes, unquoted keys, trailing commas and comments. This tool also rejects duplicate object keys instead of silently dropping a value. It reports errors rather than guessing repairs.
Does sorting keys change array order?
No. Sorting applies to object keys, including nested objects. Array elements keep their order. Formatted JSON is not a cryptographic canonicalization format for signing.
Are my files, tokens or text uploaded?
No. These tools process your input in your browser. The website serves the page and its code, but your input is not sent to a conversion server or saved in an account.
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Your input and files are processed on your device. Keep sensitive results out of shared clipboards and use a trusted device for private keys and tokens.