DevFormat

JSON Validator

Validate your JSON data instantly. Get detailed error messages with line numbers and column positions to quickly fix syntax errors.

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Why Validate JSON?

JSON is strict. A single missing comma or an extra trailing comma can break your entire application. Our JSON Validator parses your code in real-time to find syntax errors that are often missed by the human eye.

By using a validator, you ensure that your data conforms to the official JSON standard (RFC 8259), preventing runtime errors in your applications and APIs.

Common JSON Errors

  • Trailing Comma: JSON does not allow a comma after the last item in an object or array.
  • Quotes: Keys and string values must be enclosed in double quotes ("), not single quotes (').
  • Undefined: undefined is not a valid JSON value (use null instead).
  • Comments: Comments are not supported in standard JSON.

Tips for Debugging

If your JSON is valid but not working as expected, check your data types. Strings like "true" are different from the boolean true, and "123" is a string, not a number.