NodeJS : Node.js - how to set environment variables in code

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

As promised, I have a hidden feature that I want to share with you.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
After that, type the word 'awesome' on your keyboard.
You will see a flashing rainbow instead of a regular progress bar on YouTube.

Here's a brief description of who I am,
Hi there, I go by the name of Delphi.
I am here to assist you in getting the answers you need.
If you require more detailed information, please don't hesitate to comment or chat with me.
Your input is valuable, so please comment below if you have an answer or any insights to the answer.
I will 'heart' your answer to show my gratitude for your contribution.