Web Reference: Description In JavaScript NaN is short for "Not-a-Number". The isNaN() method returns true if a value is NaN. The isNaN() method converts the value to a number before testing it. Jul 8, 2025 · To test if a value is a number, use typeof x === "number". The isNaN() function answers the question "is the input functionally equivalent to NaN when used in a number context". If isNaN(x) returns false, you can use x in an arithmetic expression as if it's a valid number that's not NaN. Jul 23, 2025 · The JavaScript isNaN () Function is used to check whether a given value is an illegal number or not. It returns true if the value is a NaN else returns false. It is different from the Number.isNaN () Method. Syntax: isNaN( value ) Parameter Values: This method accepts a single parameter as mentioned above and described below:
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