Free Online JSON Validator

Validate your JSON against RFC 4627 and JavaScript specification quickly and easily. Ensure your data structure is correct with our free online tool.

How to Use Our JSON Validator

  1. Input JSONPaste your JSON content or upload a file (max 2MB).
  2. Choose Validation ModeYour content will be checked against both RFC 4627 and JavaScript standards.
  3. Run ValidationClick 'Validate JSON' to check your content.
  4. Review ResultsCheck validation results and fix any syntax issues.

Key Features of Our JSON Validator

Dual Standard Validation

Validate against both RFC 4627 and JavaScript standards.

Detailed Error Reports

Get specific error messages and syntax highlighting.

Format Support

Support for nested objects, arrays, and all JSON data types.

Secure Processing

Local validation with complete data privacy.

Popular Use Cases

API Development

  • Validate API request/response payloads
  • Test REST API endpoints
  • Debug API integration issues

Configuration Management

  • Validate configuration files
  • Check package.json files
  • Verify data export formats

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Helpful Resources & Guides