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The “callback is not defined” error is a common issue encountered when working with Node.js. It occurs when a callback function is not defined or is not passed as an argument to a function. This error can be difficult to debug, as it can be caused by a variety of issues. In this article, we will discuss the causes of this error and how to solve it. We will also provide some tips on how to avoid this error in the future. By the end of this article, you should have a better understanding of how to debug and prevent this error.<\/p>\n
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The most likely cause of this error is that the callback function has not been defined. To fix this, you need to define the callback function before calling it. For example:<\/p>\n
\/\/ Define the callback function
\nfunction myCallback(err, data) {
\n if (err) {
\n console.log(err);
\n } else {
\n console.log(data);
\n }
\n}<\/p>\n
\/\/ Call the callback function
\nmyFunction(myCallback); <\/p>\n
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