NodeJS : Simplest way to authenticate a user with express?

NodeJS : Simplest way to authenticate a user with express?
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.
Next, enter the letters 'awesome' on your keyboard.
You will see a flashing rainbow instead of a regular progress bar on YouTube.

Let me give you a brief introduction of who I am,
Hey, I'm known as Delphi.
I am at your disposal to help you with any questions you have.
NodeJS : Simplest way to authenticate a user with express?
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a Simplest NodeJS user with : authenticate way to express?