JSON Validator

JSON Input 0 characters
1
Validation Result
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Validation Rules

  • Must comply with RFC 8259 JSON standard
  • All strings must be double-quoted
  • No trailing commas in objects/arrays
  • No comments or undefined values allowed
  • Supported types: string, number, object, array, boolean, null

Common Validation Errors

Error TypeExampleSolution
Syntax error{'key': value}Use double quotes
Malformed{"nums": [1, 2, ]}Remove trailing comma
Invalid value{"flag": TRUE}Use lowercase true

Pro Tips

  • Validate before using in production code
  • Check for hidden characters from editors
  • Use our JSON Formatter to fix issues automatically
  • Pay special attention to API response validation

Related Tools

Need more? Try our JSON Editor, JSON Diff Tool, or Schema Generator.