NodeJS : How to make sure only one socket.io connection is open per user?

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.
After that, type the word 'awesome' on your keyboard.
Your YouTube progress bar will transform into a flashing rainbow.

A little intro about me,
Greetings, my name is Delphi.
I am here to help you get the answers you are seeking.
Let me know if you have more specific questions or concerns by leaving a comment or starting a chat.
Your input is valuable, so please comment below if you have an answer or any insights to the answer.
I will 'heart' your answer as a sign of appreciation.