Node.js Interview Questions and Answers

These are the Node.js questions you'll encounter in technical interviews, each with a detailed written answer. Master the event loop and async patterns, then work through streams, APIs, and advanced topics.

Last updated: Sep 21, 2026
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What is Node.js?

Node.js is a JavaScript runtime built on Chrome's V8 engine. It allows JavaScript to run on servers and has become the foundation of modern backend development, enabling full-stack JavaScript development.

Node.js interviews test your understanding of the event loop, asynchronous programming, streams, file systems, and the npm ecosystem. You'll discuss module systems, middleware, and how to build scalable backend systems.

Node.js expertise is critical for backend and full-stack development. Master the runtime and you'll be ready for roles at startups and enterprises alike.

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