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JavaScript isFinite() Function

  • Last Updated : 22 Dec, 2020

The JavaScript isFinite() function is used to check whether a number is a finite, legal number or not. It returns true for all the values except +infinity, -infinity, or NaN.



Parameters: This method takes a single parameter as mentioned above and discussed below:

  • value: It is a required value passed in the isFinite() function.

Return Value: It returns a Boolean value i.e. returns false if the value is +infinity, -infinity, or NaN, otherwise returns true.


<!DOCTYPE html>
    <p>JavaScript isFinite() Function</p>
        document.write(isFinite(12) + "<br>");
        document.write(isFinite(0) + "<br>");
        document.write(isFinite(12.3) + "<br>");
        document.write(isFinite("Geeks") + "<br>");
        document.write(isFinite("456") + "<br>");
        document.write(isFinite(-46) + "<br>");


Supported Browsers:

  • Chrome
  • Firefox
  • Edge
  • Opera
  • Safari
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