JSON and its Common Operations

✅ What is 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 primarily used for:

• Data storage

• Data exchange between client and server

• APIs and web services (like REST)

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🔹 JSON Syntax Basics

• Data is in name/value pairs

• Data is separated by commas

• Curly braces {} hold objects

• Square brackets [] hold arrays

Example:

{
  "name": "Alice",
  "age": 25,
  "isStudent": false,
  "skills": ["JavaScript", "Python"]
}

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🔹 Common JSON Operations in JavaScript

1. Parse JSON (string ➜ object)

Convert a JSON string into a JavaScript object.

const jsonStr = '{"name":"Alice","age":25}';
const obj = JSON.parse(jsonStr);
console.log(obj.name); // Alice

2. Stringify (object ➜ string)

Convert a JavaScript object into a JSON string.

const obj = { name: "Bob", age: 30 };
const jsonStr = JSON.stringify(obj);
console.log(jsonStr); // {"name":"Bob","age":30}

3. Accessing JSON Data

Once parsed, JSON behaves like a regular JavaScript object.

const data = JSON.parse('{"city":"Mumbai","temp":32}');
console.log(data.city); // Mumbai

4. Modifying JSON

You can change values once it’s parsed into an object.

let user = JSON.parse('{"name":"Tom"}');
user.name = "Jerry";
console.log(JSON.stringify(user)); // {"name":"Jerry"}

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🔸 Summary Table

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