Web Reference: Jul 8, 2025 · To tell if a value is NaN, use Number.isNaN() or isNaN() to most clearly determine whether a value is NaN — or, since NaN is the only value that compares unequal to itself, you can perform a self-comparison like x !== x. Description In JavaScript, NaN is short for "Not-a-Number". In JavaScript, NaN is a number that is not a legal number. The Global NaN property is the same as the Number.Nan property. Apr 16, 2010 · The NaN (Not-a-Number) is a weirdo Global Object in javascript frequently returned when some mathematical operation failed. You wanted to check if NaN == null which results false.
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