Free Online JSON Validator
Validate your JSON syntax instantly. Get detailed error messages with line numbers to fix issues quickly.
JSON Input
Validation Result
Enter JSON and click Validate
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What is JSON Validation?
JSON validation is the process of checking whether a JSON string conforms to the JSON specification. A valid JSON must follow specific syntax rules including proper use of brackets, quotes, colons, and commas.
Common JSON Syntax Errors
- Missing commas - Between key-value pairs or array elements
- Trailing commas - Extra comma after the last element
- Unquoted keys - Object keys must be strings in double quotes
- Single quotes - JSON requires double quotes for strings
- Unclosed brackets - Missing
]or} - Invalid values - Using undefined, NaN, or Infinity
How to Use This Validator
Simply paste your JSON data into the input field and click the "Validate" button. If there are any syntax errors, you'll see a detailed error message indicating what went wrong and approximately where the error occurred. Valid JSON will be confirmed with a success message.
JSON Validation Best Practices
- Always validate JSON before using it in production applications
- Use a JSON formatter to make your data readable before validation
- Check for encoding issues with special characters
- Validate API responses during development and testing