Number.isFinite()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015.

The Number.isFinite() static method determines whether the passed value is a finite number — that is, it checks that a given value is a number, and the number is neither positive Infinity, negative Infinity, nor NaN.

Try it

console.log(Number.isFinite(1 / 0));
// Expected output: false

console.log(Number.isFinite(10 / 5));
// Expected output: true

console.log(Number.isFinite(0 / 0));
// Expected output: false

Syntax

Number.isFinite(value)

Parameters

value: The value to be tested for finiteness.

Return value

The boolean value true if the given value is a finite number. Otherwise false.

Examples

Using isFinite()

Number.isFinite(Infinity); // false
Number.isFinite(NaN); // false
Number.isFinite(-Infinity); // false

Number.isFinite(0); // true
Number.isFinite(2e64); // true

Difference between Number.isFinite() and global isFinite()

In comparison to the global isFinite() function, this method doesn't first convert the parameter to a number. This means only values of the type number and are finite return true, and non-numbers always return false.

isFinite("0"); // true; coerced to number 0
Number.isFinite("0"); // false
isFinite(null); // true; coerced to number 0
Number.isFinite(null); // false

Specifications

Specification
ECMAScript® 2026 Language Specification # sec-number.isfinite

Browser compatibility

	Desktop					Mobile						Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	Deno	Node.js
`isFinite`	19	12	16	15	9	25	16	14	9	1.5	4.4	1.0	0.10.0