JSON Formatter & Validator
Validate, pretty-print or minify JSON.
Use it to check API responses, configuration files and logs before pasting them into another system.
Uses JavaScript JSON parsing: large integers may lose precision and duplicate keys keep their last value.
How to use & example
- Paste JSON into the Input box.
- Choose Format JSON for readable indentation or Minify JSON for a compact single line.
- Fix any validation message, then copy the result.
{"server":"web01","port":443}{
"server": "web01",
"port": 443
}