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

321. How would you debug intermittent latency spikes in Node.js systems?

322. What causes non-deterministic backend behavior in distributed Node.js applications?

323. How do asynchronous race conditions emerge in microservice architectures?

324. How would you prevent stale-state propagation across backend services?

325. What consistency problems occur during optimistic event processing?

326. How would you reconcile conflicting writes in distributed systems?

327. How do Node.js systems support eventual consistency guarantees?

328. How would you synchronize distributed state across globally deployed services?

329. How do websocket-driven workloads affect backend stability under scale?

330. How would you optimize realtime Node.js systems handling millions of updates?