JSON Validator

Validate, format, and beautify JSON data with detailed error reporting. Perfect for developers and API testing.

0 characters, 0 lines
Valid JSON

Your JSON is valid and well-formed.

Invalid JSON

There is an error in your JSON.

Formatted JSON
Recent Validations

About JSON Validator

This free online JSON validator helps you check if your JSON data is valid and well-formed. It also provides formatting options to make your JSON more readable. JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write and easy for machines to parse and generate.

Frequently Asked Questions

JSON (JavaScript Object Notation) is a lightweight data format used for data interchange. Validation is important because even small syntax errors can cause applications to fail. A JSON validator ensures your data is correctly structured and can be parsed by applications without errors.

Common JSON errors include:
  • Missing or extra commas
  • Unquoted or incorrectly quoted keys
  • Trailing commas (not allowed in JSON)
  • Mismatched brackets or braces
  • Invalid escape sequences in strings
  • Incorrect number formats

Yes, your data is completely safe. All JSON validation happens locally in your browser - your JSON is never sent to our servers. We don't store or track any of the data you validate.

Formatting (or beautifying) JSON adds proper indentation and line breaks to make it more readable for humans. Minifying JSON removes all unnecessary whitespace to make the file size smaller, which is useful for network transmission. Both formats are valid JSON, but serve different purposes.