15 Common Node.js Interview Questions With Concise Answers for 2026

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A developer guide published on DEV Community outlines 15 frequently asked Node.js interview questions along with brief, focused answers. The topics covered range from core concepts like the event loop, streams, and single-threaded architecture to practical areas such as async/await, JWT authentication, and password storage. The guide also addresses scaling strategies, including the use of the cluster module, Redis caching, and PM2 for utilizing multiple CPU cores. It distinguishes between CommonJS and ES Modules, and explains differences between Promise methods like all, allSettled, race, and any. The resource targets developers preparing for Node.js interviews and is part of a larger 64-question guide ranging from beginner to advanced levels.

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