Node.js Interview Questions & Practice

Sample Node.js interview questions

• Event Loop

  Can you explain how Node's event loop differs from the browser's, especially around things like process.nextTick and setImmediate?

• Streams Buffers

  Can you explain what a Node stream is, and why you'd use one instead of reading a whole file into memory?

• Middleware Patterns

  Can you explain what middleware is in a framework like Express, and how the request/response cycle flows through it?

• Error Handling

  How do you handle errors in asynchronous code in Node — what's different about handling a rejected promise versus a synchronous throw?

• Api Design

  How do you decide on a versioning strategy for a REST API?

• Modules Packaging

  Can you explain the difference between CommonJS and ES modules in a Node context, and why that transition has been messy?

• Process Scaling

  Can you explain why Node is single-threaded, and how you'd take advantage of multiple CPU cores anyway?

• Security Backend

  Can you explain the difference between authentication and authorization, and give an example of getting one right but the other wrong?

These are a few examples — each real session pulls 5 questions at random from a larger pool across every category above, so repeat sessions won't repeat the same set.

Frequently asked questions

Is this a live-coding Node.js interview?

No. Node.js practice on Hone is a spoken, conceptual discussion — you explain your reasoning out loud rather than writing or sharing code.

How many Node.js questions are there?

Each session pulls 5 questions at random from a larger pool across multiple categories, so repeat sessions don't repeat the same set.

Can I choose the difficulty?

Yes — easy, medium, or hard, chosen right before you start. It changes how hard the interviewer pushes on follow-ups and how strictly it scores your answers.

Is it free?

Yes — every account gets 5 interviews a month, any track, for free. Pro upgrades to unlimited interviews for $99/month.