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 commonly used for transmitting data in web applications.

JSON Syntax

JSON syntax is derived from JavaScript object notation syntax:

• Data is in name/value pairs.
• Data is separated by commas.
• Curly braces hold objects.
• Square brackets hold arrays.

Example

Here is an example of a JSON object:

{
    "firstName": "John",
    "lastName": "Doe",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "New York",
        "state": "NY"
    },
    "phoneNumbers": [
        { "type": "home", "number": "212-555-1234" },
        { "type": "office", "number": "646-555-4567" }
    ]
}

Converting JSON to JavaScript Object

You can convert a JSON string into a JavaScript object using the JSON.parse() method:

let jsonString = '{"firstName":"John","lastName":"Doe","age":30}';
let jsonObject = JSON.parse(jsonString);
console.log(jsonObject.firstName); // John

Converting JavaScript Object to JSON

You can convert a JavaScript object into a JSON string using the JSON.stringify() method:

let jsObject = { firstName: "John", lastName: "Doe", age: 30 };
let jsonString = JSON.stringify(jsObject);
console.log(jsonString); // {"firstName":"John","lastName":"Doe","age":30}

Use Cases

JSON is commonly used for:

• Exchanging data between a web server and a client.
• Storing configuration settings.
• Transmitting data between different parts of an application.

For more detailed information, you can check out resources like W3Schools[^1^][1] and MDN Web Docs[^2^][3].