JavaScript Array.isArray()

Check if an object is an array:

const fruits = ["Banana", "Orange", "Apple", "Mango"];
let result = Array.isArray(fruits);

Check if another datatype is an array:

let text = "W3Schools";
let result = Array.isArray(text);

Description

The isArray() method returns true if an object is an array, otherwise false.

Array.isArray() is a static property of the JavaScript Array object.

You can only use it as Array.isArray().

Using x.isArray(), where x is an array will return undefined.

Array.isArray(obj)

Parameter	Description
obj	Required. An object (or any data type) to be tested.

Type	Description
A boolean	`true` if the object is an array, otherwise `false`.

isArray() is an ECMAScript5 (ES5) feature.

ES5 (JavaScript 2009) fully supported in all modern browsers since July 2013:


Chrome 23	IE/Edge 10	Firefox 21	Safari 6	Opera 15
Sep 2012	Sep 2012	Apr 2013	Jul 2012	Jul 2013