Free Online JSON Validator & Syntax Checker
Validate JSON syntax online with detailed error messages and line numbers. Check JSON structure, find missing brackets, and fix formatting issues instantly. Free tool.
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What is JSON Validator?
JSON Validator is a free online tool that checks whether your JSON data is syntactically correct. It provides detailed error messages including line and column numbers to help you quickly locate and fix issues. Perfect for developers debugging API responses, configuration files, or any JSON data.
How to Use JSON Validator
- Paste your JSON data into the input area
- The tool automatically validates as you type
- View validation status and error details on the right
- Use the statistics to understand your JSON structure
JSON Validator Features
- Real-time JSON syntax validation
- Detailed error messages with line and column numbers
- JSON structure statistics (objects, arrays, types)
- Instant feedback as you type
- Works entirely in your browser - data never leaves your device
JSON Validator FAQ
What kinds of errors can this tool detect?
The validator detects all JSON syntax errors including missing quotes, trailing commas, unmatched brackets, invalid escape sequences, and incorrect value types.
Can it validate JSON against a schema?
Currently this tool validates JSON syntax only. Schema validation (JSON Schema) is a planned feature for a future update.
Is my data secure?
Yes! All validation happens directly in your browser. Your JSON data is never sent to any server.