Data types tell what kind of value a variable stores in JavaScript.

• Primitive types store a single value.
• Non-primitive types can store multiple values. 

Primitive types:

1. String:

let name = "Mahendra";

2. Number:

let age = 25;

3. Boolean:

let isLogin = true;

4. Undefined:

let city;

5. Null:

let data = null;

6. BigInt:

let bigNum = 12345678901234567890n;

7. Symbol:

let id = Symbol("id");

Non-primitive types:

1. Object:

let person = {
  name: "Raj",
  age: 25
};

2. Array:

let colors = ["Red", "Blue", "Green"];

 JavaScript typeof Operator

The typeof operator is used to check the data type of a variable or value in JavaScript.

let name = "Mahendra";

console.log(typeof name);

Output:

string