Where can I find an example of a cool node.js application and best practice for organizing and writing code?

Question

Node.js

Hello.
I developed a small test introductory project for myself on the MEAN stack, but the EN component turned out to be very simple (endpoint REST API with a simple account system based on passport.js in the form of server.js and routes.js).
Please advise which way to dig (including application examples and best practice, like https://github.com/johnpapa/angular-styleguide for Angular.js) to learn more deeply about Node.js itself, in combination with Express.js to consider yourself a MEAN stack developer and have the minimum required practice to implement "real" projects in this stack and further employment. Thanks in advance.

Answer 1

Which open source node.js project to choose as a reference for architecture and style?
What are some good examples of Node.js + Express sites that I can look at the source code for learning purposes?