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Learn the fundamentals of JSON syntax, structure, and common use cases in modern web development.
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. It is based on a subset of the JavaScript Programming Language.
JSON data is written as key-value pairs. Keys must be strings wrapped in double quotes. Values can be strings, numbers, objects, arrays, booleans, or null. Objects are enclosed in curly braces, arrays in square brackets.
Use JSON.parse() to convert a JSON string into a JavaScript object, and JSON.stringify() to convert a JavaScript object into a JSON string. These methods are available in all modern browsers and Node.js.
JSON is the most common data format for REST APIs. Most API responses are JSON objects, and API requests often include JSON payloads in the body.