Cause for 'Route.get() requires a callback function but got a [object Undefined]' Error in Node.js

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Understanding the Error

Common Causes

Incorrect Import or Export of Functions:

For example:

[[See Video to Reveal this Text or Code Snippet]]

Typographical Errors:
A simple typo in the variable name holding the callback function or the route method can also cause this error. Double-check the function and route method names for any discrepancies.

Example:

[[See Video to Reveal this Text or Code Snippet]]

Missing Function:
Ensure that the function you are referring to actually exists. If for some reason the function hasn't been defined or has been improperly named, it will cause this error.

Incorrect Routing Configuration:
Make sure that the routing middleware is set up correctly to recognize the callback functions.

How to Resolve

Check and Correct Your Imports/Exports:
Ensure that you are exporting and importing your callback functions correctly.

[[See Video to Reveal this Text or Code Snippet]]

[[See Video to Reveal this Text or Code Snippet]]

Verify Callback Functions:
Confirm that the handler function is defined and carried over correctly in your files.

Debugging:
Use console logs or a debugger to inspect variables that are expected to be functions and ensure they are being properly defined and imported.