JavaScript JSON (JavaScript Object Notation)

Subject: JavaScript

JSON stands for JavaScript Object Notation. It is a lightweight data-interchange format that is easy for humans to read and write, and easy for machines to parse and generate.

Why Use JSON?

  • Language-independent and lightweight.
  • Easy to convert from JavaScript objects.
  • Works seamlessly with APIs and RESTful services.
  • Readable and structured format for configuration or data storage.

JSON Syntax Rules

  • Data is in name/value pairs: "name": "value"
  • Data is separated by commas.
  • Curly braces {} hold objects.
  • Square brackets [] hold arrays.
  • Strings must be in double quotes.
  • Only number, string, boolean, null, array, and object are allowed.

Example: JSON Data

Converting Between JSON and JavaScript

1. JSON to JavaScript Object (Parsing)

2. JavaScript Object to JSON (Stringifying)

Example: JSON in API Response

Limitations of JSON

  • Cannot store functions or undefined.
  • No support for circular references.
  • Date objects are converted to strings.

Key Takeaways

  • JSON is used for data exchange and configuration.
  • Use JSON.stringify() to convert a JavaScript object to a JSON string.
  • Use JSON.parse() to convert a JSON string to a JavaScript object.
  • JSON syntax is strict: only double-quoted strings and basic data types.
  • Ideal for APIs, AJAX, storage, and server communication.
Next : BigInt