Format compact JSON
- Input: {"name":"QuickCalc","tools":["json","jwt"]}
Readable multi-line JSON with indentation
Formatted JSON is easier to inspect during debugging and documentation work.
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JSON Formatter / Validator
Format, minify, and validate JSON locally in your browser without uploading data.
Runs locally. JSON is not uploaded.
Mode
StatusWaiting
Primary result
Waiting
Paste JSON before processing.
Characters
0
Lines
0
Keys
0
Objects
0
Arrays
0
JSON input
Output
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Decode a JWT payload
If this JSON came from a token payload, inspect exp, iat, nbf, and signature boundaries next.
JSON parse and stringify
JSON.stringify(JSON.parse(input), null, spacing)- input
- Raw JSON text pasted into the tool
- spacing
- Indentation size used for formatted output
- JSON.parse
- Native parser that validates JSON syntax
How this tool works
- Parse the input with the browser's native JSON parser.
- Show the parser error when syntax is invalid.
- Format with indentation, minify to one line, or validate without changing data.
Worked examples
Validate API response
- Paste response body from a local API request
Valid JSON or parser error message
Validation catches missing commas, trailing commas, and unquoted keys.
FAQ
Use this result as an estimate
JSON formatting validates syntax and changes text layout only. It does not redact secrets, verify API trust, or make sensitive data safe to share.