JavaScript Number NaN

let x = Number.NaN;

let x = NaN;

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.

Number.NaN

Number.NaN is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	Yes