✨ JSON Validator
Validate JSON against RFC 4627 and JavaScript specification. Toggle lenient options for non-quoted names, single quotes, NaN values, and leading zeroes. 100% secure, client-side validation.
Option 1: Copy-paste
Copy-paste your JSON here
Paste any JSON string for validation
Option 2: Upload file
No file chosen
Accept non-quoted names (e.g., {name: "value"})
Accept single-quotes (e.g., {'key': 'value'})
Accept 'NaN' values (JavaScript NaN)
Accept leading zeroes (e.g., 0123)
File encoding:
Validation results will appear here...
Why choose our JSON Validator?
RFC 4627 Compliant
Validates against official JSON specification with optional leniency
100% Private
Your JSON never leaves your browser. Complete client-side validation
4 Toggle Options
Non-quoted names, single quotes, NaN values, and leading zeroes
Multiple Encodings
UTF-8, ISO, Windows encodings support for file uploads