NodeJS : node.js app with nginx 502 bad gateway error

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, Ensure that the video is playing before proceeding.
Then, type the letters 'awesome' on your keyboard as the next step.
Your YouTube progress bar will transform into a flashing rainbow.

A little intro about me,
Hi, my name is Delphi, nice to meet you.
I am here to aid you in getting answers to your questions.
I am available to answer your more specific queries, so feel free to comment or start a chat.
We welcome your thoughts and feedback, so please comment below with your answer or insights to the answer.
A 'heart' from me is a way of showing appreciation for your answer.