Web Reference: Jul 3, 2018 · There is no need to pass the third parameter in the callback function of writeFile. The only thing is that we should pass a callback function. This guide will explain the fundamental reason this error occurs and teach you the modern, standard methods for preventing it by providing a default parameter or by conditionally checking for the function's existence. Mar 3, 2024 · The "TypeError: callback is not a function" error occurs when we define a callback parameter to a function but invoke the function without passing a callback. To solve the error, specify a function as a default parameter, or always provide a parameter when calling the function.
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