JSON Validator
Validate JSON syntax online for free. Check if your JSON is valid, find exact error locations, and get clear error messages. Instant browser validation.
About JSON Validator
Our JSON validator checks your JSON data against the JSON specification and reports exactly where any syntax errors occur, including the line number, character position, and a plain description of the problem. Common errors detected include missing commas, unclosed brackets, trailing commas, unquoted keys, and invalid escape sequences. Paste your JSON and get an instant pass or fail result with full error details.
Frequently Asked Questions
What common JSON errors does it detect?
Missing commas, unclosed brackets, trailing commas, unquoted keys, and invalid characters are all detected with exact locations.
Does it show the exact error location?
Yes — line number and character position are shown for every error found.
Is it free?
Yes, completely free, no signup required.