Are String Objects in JavaScript?

Last Updated : 15 Apr, 2025

Strings in JavaScript are one of the primitive data types, alongside numbers, booleans, null, undefined, bigint, and symbols. Unlike objects, primitives do not have methods or properties of their own. However, when you attempt to call a method or access a property on a string, JavaScript automatically wraps the string in a String object to provide access to methods.

JavaScript

let s = "hello"; console.log(typeof s);   console.log(s.length);    // Example with a number let x = 42; console.log(x.toString());   // Example with a boolean let y = true; console.log(y.toString());  /* Internal Working of primitives    to be treeated as objects     // Temporary wrapper object let temp = new String("hello");   console.log(temp.length); // 5  // The wrapper is discarded after use temp = null; */

Output

string 5 42 true

The String Object

JavaScript has a built-in String object that can be explicitly used to create string objects. This is different from primitive strings.

JavaScript

const s = new String("Hello"); console.log(typeof s);

Output

object

Key Differences Between Primitives and String Objects

Feature	Primitive String	String Object
Type	`"string"`	`"object"`
Memory Efficiency	More efficient	Less efficient
Use Case	Highly used in creating string	Rarely used

Tip: Always prefer primitive strings for simplicity and performance.

Why the Confusion?

The confusion arises because strings appear to have methods and properties like objects, but they are primitives. The temporary wrapping of primitives into String objects is what enables this behavior.

JavaScript

const s = "Test"; console.log(s.constructor === String);

Output

true

Here, JavaScript implicitly wraps the string in a String object to access the .constructor property.