How to Get Array or String Length in JavaScript

John on January 24, 2021

To get the length of a string or array in JavaScript, use the built-in .length property. To demonstrate this, let's look at a few examples.

Array Length

var fruit = ['Apple','Orange','Strawberry','Melon'];

console.log(fruit.length);

4

String Length

Here is another example with a string.

var fruit = 'Fruit';

console.log(fruit.length);

5

Here is another example demonstrating how to use .length to loop through every array element:

var fruit = ['Apple','Orange','Strawberry','Melon'];

for (var i = 0; i < fruit.length; i++) {
  console.log(fruit[i]);
}

Apple
Orange
Strawberry
Melon

Conclusion

Remember that indexes start at 0 meaning the last index will be one less than the array/string length.