JavaScript Data Types

JavaScript variables can hold different data types: numbers, strings, objects and more.

Data Types

• String: Represents textual data. let color = "Yellow";
• Number: Represents numeric data. let length = 16;
• BigInt: Represents large integers.
• Boolean: Represents true or false. let x = true;
• Undefined: A variable without a value.
• Null: Represents the intentional absence of any object value.
• Symbol: A unique and immutable primitive value.
• Object: A collection of properties. const person = {firstName:"John", lastName:"Doe"};

The typeof Operator

You can use the typeof operator to find the type of a JavaScript variable.

typeof "John"         // Returns "string"
typeof 3.14           // Returns "number"
typeof true            // Returns "boolean"
typeof {name:'John'}   // Returns "object"