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

1. What is Node.js and what problems does it solve?

2. How does Node.js differ from browser-based JavaScript execution?

3. What is the V8 engine?

4. How does Node.js execute JavaScript internally?

5. What is the event loop in Node.js?

6. How does the event loop differ from browser event loops?

7. What are the phases of the Node.js event loop?

8. How do microtasks and macrotasks work in Node.js?

9. What is the difference between process.nextTick and setImmediate?

10. How does asynchronous I/O work in Node.js?