JavaScript Basics

JavaScript Advanced

JavaScript Arrays

JavaScript Functions

JavaScript Objects

JavaScript DOM

JavaScript String

How to convert array to string in JavaScript?

JavaScript provides two methods using which you can convert an array to a string:

Array toString() method.
Array join() method.

Array to string with commas

The toString() method returns a string representation of an array. Within that string, array elements are separated by commas.

Note: The toString() method does not modify the original array.

let numbers = [1, 2, 3, 4, 5];
numbers.toString(); //"1,2,3,4,5"

Array to string without commas

If you want to convert array to string but don't want commas within the generated string, use the join() method.

Array join() method accepts a string parameter that works as a separator and returns a string with array values separated by the provided separator.

let numbers = [1, 2, 3, 4, 5];
numbers.join(" "); //"1 2 3 4 5"
numbers.join("-"); //"1-2-3-4-5"

If you don't pass a separator to the join() method, it will use commas as the separator.

numbers.join(); //"1,2,3,4,5"

On the other hand, if you pass an empty string to the join() method, it will simply combine all the array elements.

numbers.join(""); //"12345"

Note: The join() method does not modify the original array.

Array of objects to string

If you use toString() and join() methods with an array of objects, you will get [object Object]. So, to convert an array of objects to a string, you must use JSON.stringify() method.

let inventory = [
  {
    name:'Google Nest Cam Indoor',
    quantity:10
  },
  {
    name:'Amazon Blink Mini',
    quantity:22
  },
  {
    name:'Ring Video Doorbell',
    quantity:5
  }
];
console.log(inventory.toString());
console.log(inventory.join());
console.log(JSON.stringify(inventory));

Output

[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
[{"name":"Google Nest Cam Indoor","quantity":10},{"name":"Amazon Blink Mini","quantity":22},{"name":"Ring Video Doorbell","quantity":5}]"