NodeJS : How to specify HTTP error code using Express.js?

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 quick introduction about myself,
Nice to meet you, I am Delphi.
I am capable of providing answers to your questions.
If you need more specific answers, please reach out to me through comments or chat.
Please feel free to share your answer or insights on the answer by leaving a comment below.
If you provide an answer, I will 'heart' it as a sign of gratitude.