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JSON Validator Too

Validate JSON syntax, structure, and get detailed error reporting

Real-time results
100% Free
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Common JSON Errors

Syntax Errors

{"key": "value"}

Missing closing brace

{"key": "value}

Unquoted string value

{"key": "value",}

Trailing comma

Structural Issues

{key: "value"}

Unquoted property name

{"key": undefined}

Invalid value (use null instead)

{"date": new Date()}

JavaScript objects not allowed

About JSON Validation

JSON validation ensures your data conforms to the JSON specification and helps identify common syntax and structural errors.

What this validator checks:

  • Proper syntax and structure
  • Valid quoting of strings and property names
  • Correct use of commas, colons, and brackets
  • Valid data types (string, number, boolean, null, object, array)
  • No trailing commas (in strict mode)
  • No duplicate keys (in strict mode)

Pro Tips:

  • Use double quotes for all strings and property names
  • Use null instead of undefined or other JavaScript-specific values
  • Avoid trailing commas in arrays and objects
  • Enable strict mode for production-ready JSON
  • Use the auto-validate feature for real-time feedback