JSON Validator
Validate JSON syntax online. Check if your JSON is valid with detailed error messages and line numbers. Free JSON linter and syntax checker.
💡 Paste your JSON and it will be validated automatically. The validator checks for syntax errors and provides helpful suggestions to fix common issues.
Related JSON Tools
How to Use
- Paste your JSON data into the input field
- The validator will automatically check your JSON
- If valid, you'll see a success message with the parsed structure
- If invalid, you'll see the error with details about what went wrong
Example
Input
{"name": "John", "age": 30}Output
✅ Valid JSON!
Parsed structure:
{
"name": "John",
"age": 30
}FAQ
What does this JSON validator check?
This tool validates JSON syntax according to the JSON specification (RFC 8259). It checks for proper formatting, matching brackets, valid strings, numbers, and data types.
Why is my JSON invalid?
Common JSON errors include: missing or extra commas, unquoted keys, single quotes instead of double quotes, trailing commas, and unescaped special characters in strings.
Can I validate large JSON files?
Yes! The validator works entirely in your browser and can handle large JSON files. However, for very large files (10MB+), it may take a moment to process.
Is my data secure?
Yes, all validation happens in your browser. Your JSON data is never sent to any server.
What's the difference between JSON validation and linting?
Validation checks if JSON is syntactically correct. Linting (like JSONLint) also checks for best practices and style issues. This tool performs syntax validation.