JSON Validator

Paste your JSON below to validate it for syntax errors and incorrect formatting.

Enter JSON

Or, Upload JSON File

Accept non-quoted names Accept single-quotes Accept 'NaN' values Accept leading zeroes Allow trailing commas Allow Infinity values Allow comments

A JSON Validator is a tool that checks if a JSON input follows proper syntax and rules.

Simply enter or upload a JSON file, select validation options, and click "Validate JSON".

Trailing commas are commas at the end of a list or object. Standard JSON does not allow them.

Standard JSON requires double quotes, but this tool provides an option to accept single quotes.

"NaN" (Not-a-Number) is invalid in JSON but can be enabled for custom parsing.

If invalid, the tool will highlight errors, including the line number where the issue is found.

Need to format your JSON? Try our JSON Formatter.