NodeJS : How to pass variable from app.js to routes/index.js?

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

I promised to share a hidden feature with you, and here it is.
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.

An introduction to myself in a few words,
Howdy, my name's Delphi.
Let me aid you in resolving any queries you may have.
I am available to answer your more specific queries, so feel free to comment or start a chat.
Your thoughts and contributions are welcome, so please leave a comment below if you have an answer or insights to the answer.
I will express my appreciation for your answer by 'hearting' it.