NodeJS : Route.get() requires a callback function but got a [object Undefined]. What did I do wrong?

To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I have a secret feature that I want to reveal to you.
This is a YouTube's feature which works on Desktop.
First, Ensure that the video is playing before proceeding.
Then, type the letters 'awesome' on your keyboard as the next step.
Your YouTube progress bar will transform into a flashing rainbow.

Here's a brief description of who I am,
Howdy, my name's Delphi.
I am available to help you find solutions to your inquiries.
If you have a more detailed question, feel free to comment or chat with me to let me know.
Your thoughts and contributions are welcome, so please leave a comment below if you have an answer or insights to the answer.
Providing an answer will be acknowledged and appreciated with a 'heart' from me.