How to Validate JSON

Invalid JSON is one of the most common causes of API failures and application crashes. Validating your JSON before using it is an essential step in modern web development.

Common JSON Errors

Here are the most frequent mistakes that make JSON invalid:

1. Missing Quotes: Keys must be enclosed in double quotes.
2. Single Quotes: JSON strictly requires double quotes ("), not single quotes (').
3. Trailing Commas: A comma after the last item in an object or array is invalid.
4. Missing Commas: Forgetting a comma between elements.

Example of Invalid JSON:

{
  "name": "John",
  "age": 25, // <-- Trailing comma error!
}

How to Check Your JSON

You can use the JSON Validator to instantly check your data. If there is a syntax error, the validator will tell you exactly which line and column contains the mistake, saving you hours of debugging.