Node.js is a JavaScript runtime built on Chrome's V8 engine that allows you to run JavaScript on the server-side, enabling development of scalable network applications.

npm (Node Package Manager) is the default package manager for Node.js, allowing developers to install, manage, and publish JavaScript packages and dependencies.

What is middleware in Express?

Middleware functions in Express are functions that have access to request and response objects, can modify them, end the request-response cycle, or pass control to next middleware.

Node.js Interview Questions

21. What are child processes in Node.js?

22. How does cluster mode work in Node.js?

23. What are the limitations of Node.js clustering?

24. How does inter-process communication work in Node.js?

25. What are streams in Node.js?

26. What are readable and writable streams?

27. What are duplex and transform streams?

28. How does backpressure work in streams?

29. How do streams improve memory efficiency?

30. What are common stream-related performance problems?