`Number.isNaN()`

Determines whether the passed value is the NaN value.

Since ES2015 Spec ↗

Syntax

Number.isNaN(value)

Name	Type	Required	Description
`value`	`any`	Yes	The value to test.

boolean — true if the value is exactly NaN; otherwise false.

console.log(Number.isNaN(NaN), Number.isNaN(0 / 0));

Output

true true

console.log(Number.isNaN('abc'), isNaN('abc'));

Output

false true

Safer than the global `isNaN`, which coerces its argument (so `isNaN('abc')` is true). This returns true only for the actual NaN value.