JSONXPath's free online JSON validator helps you instantly validate JSON syntax with real-time error detection and detailed error messages. All processing happens in your browser for maximum privacy and security.
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What is JSON Validation?
JSON validation is the process of checking whether JSON data conforms to the correct syntax rules. Valid JSON must follow specific formatting rules including proper quotes, commas, brackets, and data types.
Key Features
- Real-Time Validation: Instant feedback as you type
- Detailed Error Messages: Know exactly what's wrong and where
- 100% Client-Side: Your data never leaves your browser
- No File Size Limits: Validate JSON of any size
- Syntax Highlighting: Easy to read and debug
- Free Forever: No registration or payment required
Common JSON Validation Errors
- Missing or extra commas
- Unquoted keys or values
- Single quotes instead of double quotes
- Unclosed brackets or braces
- Invalid characters or escape sequences
- Trailing commas (not allowed in JSON)
Why Use JSONXPath Validator?
- Privacy First: All validation happens in your browser - your data never touches our servers
- Lightning Fast: No server delays, instant validation
- Developer Friendly: Clear error messages help you fix issues quickly
- Always Available: Works offline once loaded
💡 Pro Tip: Combine validation with our
JSON formatter to clean up and validate your JSON in one go!
How to Validate JSON
- Paste or type your JSON into the editor
- See real-time validation as you type
- Review any error messages if validation fails
- Fix errors and validate again
Need help with JSON? Check out our comprehensive JSON tutorial for beginners.