Web Reference: Learn how to use the isNaN () method to check if a value is Not-a-Number in JavaScript. See examples, syntax, parameters, return value, browser support and difference with Number.isNaN (). Jul 8, 2025 · 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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