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What are the different data types in JavaScript?

Asked on Jun 21, 2025

Answer

JavaScript has several data types that can be categorized into primitive and non-primitive types. Primitive types include String, Number, Boolean, Null, Undefined, Symbol, and BigInt, while non-primitive types include Objects.

// Primitive data types
        const str = "Hello, World!"; // String
        const num = 42; // Number
        const bool = true; // Boolean
        const nothing = null; // Null
        const notDefined = undefined; // Undefined
        const unique = Symbol("id"); // Symbol
        const bigIntNum = 9007199254740991n; // BigInt

        // Non-primitive data type
        const obj = { name: "Alice", age: 30 }; // Object

Additional Comment:

Primitive types are immutable, meaning their values cannot be changed.
Objects are mutable and can hold collections of values and more complex entities.
"Symbol" is used for creating unique identifiers.
"BigInt" is used for numbers larger than the maximum safe integer in JavaScript.
"Null" represents the intentional absence of any object value.
"Undefined" indicates a variable that has been declared but not assigned a value.

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Ask any question about JavaScript here... and get an instant response.

What are the different data types in JavaScript?

Asked on Jun 21, 2025

Answer

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