JSON

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 used to represent structured data as text.

JSON is commonly used for transmitting data in web applications (e.g., sending data from the server to the client, or vice versa). JSON syntax is a subset of the JavaScript object notation syntax:

• Data is represented in key-value pairs.
• Curly braces {} hold objects.
• Square brackets [] hold arrays.

Example: Here’s an example of a JSON object and how to parse and generate JSON in JavaScript:

// JSON object as a string
const jsonString = '{"name": "John", "age": 30, "city": "New York"}';

// Parse JSON string to a JavaScript object
const jsonObject = JSON.parse(jsonString);

console.log(jsonObject.name); // Output: John
console.log(jsonObject.age); // Output: 30
console.log(jsonObject.city); // Output: New York

// Modify the JavaScript object
jsonObject.age = 31;

// Convert JavaScript object back to JSON string
const newJsonString = JSON.stringify(jsonObject);

console.log(newJsonString); // Output: {"name":"John","age":31,"city":"New York"}

In this example:

• A JSON string (jsonString) is defined.
• The JSON.parse method is used to convert the JSON string to a JavaScript object (jsonObject).
• The properties of the jsonObject are accessed and modified.
• The JSON.stringify method is used to convert the modified JavaScript object back into a JSON string (newJsonString).