NodeJS : Best way to pass variables into callback functions in Node.js

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

So here is a secret hidden feature I promissed to tell you.
This is a YouTube's feature which works on Desktop.
First, Ensure that the video is playing before proceeding.
After that, type the word 'awesome' on your keyboard.
It will change your youtube progress bar into a flashing rainbow.

Let me give you a quick introduction about myself,
Hey there, I am Delphi, pleased to make your acquaintance.
Let me assist you in answering any questions you may have.
Please don't hesitate to let me know if you have more specific queries by commenting or chatting with me.
Please feel free to share your answer or insights on the answer by leaving a comment below.
Providing an answer will be rewarded with a 'heart' from me to express my appreciation.