What is JSON?

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It supports objects (key-value pairs), arrays, strings, numbers, booleans, and null. JSON is human-readable, language-independent, and widely used for APIs, configuration files, and web applications. It originated from JavaScript but is now supported by virtually all programming languages. JSON does not support comments, trailing commas, or undefined. Common file extension is .json.