# The Number isFinite() method

> Learn how the JavaScript Number.isFinite() method checks whether a value is a finite number, returning false for strings, booleans, objects, and arrays.

Author: [Flavio Copes](https://flaviocopes.com/about/) | Published: 2019-03-25 | Topics: [JavaScript](https://flaviocopes.com/tags/js/) | Canonical: https://flaviocopes.com/javascript-number-isfinite/

Returns true if the passed value is a finite number. Anything else, booleans, strings, objects, arrays, returns false:

```js
Number.isFinite(1) //true
Number.isFinite(-237) //true
Number.isFinite(0) //true
Number.isFinite(0.2) //true

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