How to organize large Node.js projects

Question

What are some good ways to organize large Node.js projects?

For example, an app making use of both express.js and socket.io? This would include both application logical

Answer 1

If you don't mind, you can always learn typescript and go for https://nestjs.com/

If you want to stick with JS I strongly recommend to use onion architecture. The best practice is to keep separated business logic, controllers, even libraries (they should be wrapped inside of some classes / helpers) - just in case, if you will have to migrate to another library (different CSV parser etc.).

With onion architecture, you don't care from where requests comes from, there won't be a lot of changes to add even some message broker.

Also try this one https://en.wikipedia.org/wiki/Domain-driven_design

ESLint may help with proper project organization.