JavaScript string.length

Last Updated : 11 Jul, 2025

The string.length is a property in JS which is used to find the length of a given string. The string.length property returns 0 if the string is empty.

javascript

let s1 = 'gfg';
console.log(s1.length);

let s2 = '';
console.log(s2.length);

let s3 = '#$%A';
console.log(s3.length);

Output

3
0
4

Syntax:
string.length
Return Values: It returns the length of the given string.

In JavaScript arrays also have length property to find length of an array. But unlike arrays, we cannot change length of string using length properly because strings are immutable in JS.

JavaScript

let a = ["js", "css", "html"];
a.length = 2;  // Changes length of array
console.log(a);

let s = "geeksforgeeks"
s.length = 3;  // Has no effect on string
console.log(s);