Free Online JSON Validator

JSON Validator

Validate your JSON input for correctness and view instant error messages if your syntax is invalid.

Paste your JSON code here

🔍 What does this tool do?

JSON Validator checks whether your JSON input is syntactically correct. It instantly notifies you if the structure is valid and highlights errors if it's not — helping you debug and clean up your data quickly.

⭐ Key Features

• Instant JSON validation
• Real-time syntax error display
• JSON beautification if valid
• One-click copy and reset actions
• Lightweight and mobile-friendly interface

⚙️ How to use?

• Paste your JSON into the input field
• Click Validate JSON
• If valid, you'll see a confirmation and formatted output
• Use copy/clear buttons as needed

💡 Creative Use Cases:

Developers testing API responses

Quickly validate JSON responses from APIs during development and debugging.

Debugging server-side JSON data

Check JSON data structures before processing or storing in databases.

Teaching and learning JSON basics

Educational tool for understanding JSON syntax and structure.

Validating JSON before submission

Ensure JSON data is properly formatted before sending to services.

QA teams checking data integrity

Quality assurance testing for structured data formats.

✨ Tool Description:

"JSON Validator is a free online tool to validate JSON data. It detects syntax errors, confirms formatting, and beautifies your code. Ideal for developers, students, and API testers."

❓ FAQs

What is JSON and why validate it? +

JSON (JavaScript Object Notation) is a lightweight data format used for storing and exchanging data. Validation ensures your JSON follows proper syntax rules, preventing errors when processing the data.

Does this tool support nested JSON? +

Yes! This validator supports complex nested JSON structures including arrays, objects, and deeply nested data of any complexity level.

Is my data stored or sent anywhere? +

No, all validation happens locally in your browser. Your JSON data is never sent to any server or stored anywhere - it's completely private and secure.

Can I copy or download the validated JSON? +

Yes! You can copy both the original input and the beautified/formatted result using the copy buttons. The formatted JSON is properly indented for better readability.

Does this work on mobile and tablets? +

Absolutely! The tool is fully responsive and works perfectly on all devices including smartphones, tablets, and desktop computers.

What if my JSON is invalid? +

The tool will show you exactly what's wrong with your JSON, including the specific error message and often the line where the problem occurs, making it easy to fix.