JSON Validator
JSON validator online with line-by-line error details. Check if your JSON is valid instantly—get precise error locations and fix issues fast.
JSON Input
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Common JSON Errors:
- • Missing or extra commas
- • Unquoted property names
- • Single quotes instead of double quotes
- • Trailing commas after last item
- • Unescaped special characters in strings
Features
- Real-time JSON syntax validation
- Line and column error reporting
- Instant feedback as you type
- Clear error messages with explanations
- Character and line count statistics
- Load sample invalid JSON for testing
Common Use Cases
- Validate JSON before saving to database
- Check API request/response validity
- Verify configuration file syntax
- Debug JSON parsing errors
- Ensure data integrity before deployment
Understanding JSON Validation
JSON validation ensures your data follows the correct syntax rules. Invalid JSON will cause parsing errors in applications, APIs, and databases.
Common validation checks:
- Syntax - Proper use of brackets, braces, commas, and quotes
- Data types - Strings, numbers, booleans, arrays, objects, null
- Structure - Balanced opening/closing brackets and braces
- Encoding - Proper UTF-8 character encoding
Our validator provides precise error locations (line and column numbers) to help you fix issues quickly.
Examples
{
"user": {
"id": 12345,
"active": true
}
}{
"name": "John"
"email": "john@example.com"
}{
name: "John Doe"
}Frequently Asked Questions
Common issues: missing/extra commas, unquoted keys, single quotes, trailing commas, unescaped characters, or unbalanced brackets.
Yes, copy and paste your file contents into the validator. The tool works entirely in your browser.
It means the parser found a character it didn't expect. Check the line number - often it's a missing comma or quote.
Check for: trailing commas, single quotes, unquoted keys, or comments (not allowed in standard JSON).
Yes! Validation happens as you type with a small delay to avoid performance issues during fast typing.