Web Reference: Sep 23, 2020 · Your function is written with a parameter, but when you call it you pass nothing. In JavaScript, functions can be passed as arguments to other functions. The parameter that receives the function is commonly named callback. The error occurs when the code tries to execute this parameter using parentheses (), but the parameter's value is not a function. The "TypeError: callback is not a function" error occurs when we define acallbackparameter to a function but invoke the function without passing acallback. To solve the error, specify a function as a default parameter, or alwaysprovide a parameter when calling the function. Here is an example of how the error occurs.
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