# The Number isInteger() method

> Learn how the JavaScript Number.isInteger() method checks whether a value is an integer, returning false for decimals, strings, booleans, objects, and arrays.

Author: [Flavio Copes](https://flaviocopes.com/about/) | Published: 2019-03-14 | Topics: [JavaScript](https://flaviocopes.com/tags/js/) | Canonical: https://flaviocopes.com/javascript-number-isinteger/

Returns true if the passed value is an integer. Anything else, booleans, strings, objects, arrays, returns false:

```js
Number.isInteger(1) //true
Number.isInteger(-237) //true
Number.isInteger(0) //true

Number.isInteger(0.2) //false
Number.isInteger('Flavio') //false
Number.isInteger(true) //false
Number.isInteger({}) //false
Number.isInteger([1, 2, 3]) //false
```