JSON Validator

Free Online JSON Validator - Check Valid JSON Instantly

Use our free JSON Validator to verify if your JSON data is properly formatted and error-free. Ideal for developers, API testers, and data analysts, this tool helps you validate JSON structures in real-time for faster debugging and accurate output.

What is a JSON Validator?

A JSON Validator is a developer tool that checks the syntax and structure of your JSON data. It detects common formatting errors like missing commas, brackets, or quotes, and ensures your JSON complies with the official standard.

How to Use the JSON Validator

1. Paste your JSON code into the input box.
2. Click the “Validate” button.
3. The result will instantly show whether your JSON is valid or highlight the errors.

Example of Valid JSON

{
  "firstName": "John",
  "lastName": "Smith",
  "gender": "male",
  "age": 30,
  "address": {
    "streetAddress": "150",
    "city": "San Diego",
    "state": "CA",
    "postalCode": "263142"
  }
}

Invalid JSON Example Output

Error: Unexpected token } in JSON at position 145

Top Features

• Real-Time Validation: Detects errors instantly as you input JSON data.
• No Downloads Required: Fully browser-based with no installation or signup.
• Handles Complex Structures: Supports large JSON files and nested objects.
• Beautify & Format: Offers built-in formatting for improved readability.

Popular Use Cases

• Debugging API responses for web and mobile apps
• Validating configuration files for deployment
• Ensuring frontend/backend data integrity
• Educational use for understanding JSON structure

Frequently Asked Questions (FAQs)

1. What does this JSON Validator do?

This tool checks if your JSON input is valid by highlighting syntax and structural errors. It helps ensure your code is correct and compliant with JSON formatting rules.

2. Is this JSON Validator tool free?

Yes, the tool is completely free and has no usage limits or sign-up requirements.

3. What happens if the JSON is invalid?

The tool will display an error message with the exact location and type of error in your JSON code.

4. Can I validate large or deeply nested JSON files?

Yes, the tool is optimized for performance and works efficiently with large and complex JSON objects.

5. Does this tool support JSON Schema validation?

This version checks for syntax errors only. JSON Schema validation support will be added soon.

Conclusion

Validate your JSON quickly and accurately with Webtooly’s JSON Validator. Whether you're troubleshooting APIs or testing configurations, this tool simplifies the validation process and boosts your coding productivity. Be sure to explore other developer tools on Webtooly to enhance your workflow.