Your data is never sent to a server or stored anywhere. All processing happens in your browser.

JSON Validator

How to Use

Paste or type JSON into the input area. The validator checks syntax in real time and shows whether the JSON is valid. If there's an error, it displays the error message and position. Valid JSON is automatically formatted with proper indentation below.

What Is JSON?

JSON (JavaScript Object Notation) is a lightweight data format used for exchanging data between systems. It supports objects (key-value pairs in curly braces), arrays (ordered lists in square brackets), strings, numbers, booleans, and null. JSON requires double quotes for strings, no trailing commas, and no comments.

Common Use Cases

  • Debugging API responses that return malformed JSON.
  • Validating configuration files (package.json, tsconfig.json, etc.).
  • Checking JSON data before importing into databases.
  • Verifying webhook payloads from external services.
  • Cleaning up and formatting minified JSON for readability.

Tips

  • Common JSON errors: trailing commas, single quotes, unquoted keys, missing closing brackets.
  • JSON does not support comments — remove // or /* */ before validating.
  • Use the formatted output to spot structural issues in deeply nested data.
  • The key/value/depth stats help you understand the complexity of your data.
  • For large JSON files, paste a subset first to isolate the error location.

Privacy

All JSON validation happens in your browser. No data is sent to any server.