Pretty print API payload
Input: {"name":"Ava","age":27}
Output: Indented JSON with two-space nesting
Useful for reading nested payloads quickly.
JSON formatter and validator
Paste JSON and choose pretty-format or minify. Invalid JSON returns a clear parse error.
Ready.
Formula and algorithm
- Validation: JSON.parse(input)
- Pretty format: JSON.stringify(parsed, null, 2)
- Minify format: JSON.stringify(parsed)
Worked examples
Minify before transport
Input: Well-formatted JSON document
Output: Single-line compact JSON
Removes spaces and line breaks while preserving data.
Invalid JSON detection
Input: {"x":1,}
Output: Parse error shown with message
Trailing commas are not valid JSON and are flagged immediately.
FAQ
Does this support comments in JSON?
No. Standard JSON does not allow comments.
Will my payload leave the browser?
No. Formatting and validation happen locally in your tab.
Can I minify large JSON files?
Yes, within the memory limits of your browser/device.
Related tools
Updated: June 7, 2026