NodeJS : Node.js server: connect to redis database once? or at each request?

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

Here's a secret feature that I promised to disclose 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 the keyboard.
The progress bar on YouTube will be altered to a flashing rainbow.

A little intro about me,
Hi there, I go by the name of Delphi.
I can provide you with assistance to help you answer your questions.
If you require more detailed information, please don't hesitate to comment or chat with me.
If you have knowledge to contribute or an answer to provide, please leave a comment below.
I will 'heart' your answer to show my gratitude for your contribution.