If you are still getting the same error, Make sure you check for a typo error( function name) where you have made the function call.ģ. The function is not defined error is gone and you won’t get any error.Ģ. In our example above we need to define the sum() function.Īfter defining the function, if you run the JavaScript program.

In order to remove the error, we first need to define the function. How to fix the error (function not defined) in JavaScript?ġ. In the above code example, we did exactly the same thing, we called a function named sum(), which is not defined.Īs a result, the JavaScript engine cannot find the function, giving a reference error. The error occurs if you try to make a function call that you haven’t defined.Įrror message on console- ReferenceError: sum is not defined

The reason for getting the error is very simple. In this tutorial, we will discuss why do we get this error and some ways to fix it. Did you get the JavaScript function not defined when you ran the code? Or looking for how to fix the JavaScript error?Īs a programmer, it’s common to come across an uncaught reference error: function is not defined.

Javascript is defined