NodeJS : Error: Evaluation failed: ReferenceError: res is not defined

NodeJS : Error: Evaluation failed: ReferenceError: res is not defined
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I'm going to share a hidden feature with you.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
Then, type the letters 'awesome' on the keyboard.
It will change your youtube progress bar into a flashing rainbow.

Allow me to introduce myself briefly,
Good day, I am Delphi.
I am here to aid you in getting answers to your questions.
NodeJS : Error: Evaluation failed: ReferenceError: res is not defined
I am available to answer your more detailed queries via comments or chat.
If you have knowledge to contribute or an answer to provide, we encourage you to comment below.
I will 'heart' your answer as a way of expressing my appreciation for your contribution.
: NodeJS not Evaluation failed: Error: is ReferenceError: defined res