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nodejs-interview-questions

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此系列收集的内容旨在帮助学生、开发者和技术爱好者为与 Node.js 相关的面试做好准备。无论您是一个刚刚开始学习的新手，还是一位想要提高技能的专业人士，我们都能为您提供帮助。

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此系列收集的内容旨在帮助学生、开发者和技术爱好者为与 Node.js 相关的面试做好准备。无论您是一个刚刚开始学习的新手，还是一位想要提高技能的专业人士，我们都能为您提供帮助。

Nodejs Interview Questions and Answers

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Table of Contents

No. Questions
1 What is Node.js?
2 What is the difference between Node.js and JavaScript?
3 Is Node.js single-threaded?
4 What kind of API function is supported by Node.js?
5 What is the difference between Synchronous and Asynchronous functions?
6 What is middleware?
7 how Node.js handles concurrency ?
8 What do you mean by event loop in Node.js?
9 What is the order in which control flow statements get executed?
10 What are the main disadvantages of Node.js?
11 What is REPL in Node.js?
12 How to import a module in Node.js?
13 What is the difference between Node.js and AJAX?
14 What is package.json in Node.js?
15 What are promises in Node.js?
16 What is event-driven programming in Node.js?
17 What is buffer in Node.js?
18 What are streams in Node.js?
19 Explain crypto module in Node.js
20 What is callback hell?
21 Explain how the npm package manager works What are some common commands and best practices when working with npm?
22 What is a cluster in Node.js?
22 What is a cluster in Node.js?
23 Explain some of the cluster methods in Node.js
24 Explain the core responsibilities of the Node.js Event Loop. How does it facilitate non-blocking I/O operations?
25 Differentiate between CommonJS (require) and ES Modules (import) in Node.js. Discuss their key differences and when you might prefer one over the other.
26 Describe the purpose and key differences between package.json and package-lock.json files in a Node.js project.
27 Discuss different strategies for handling errors in asynchronous Node.js code, particularly with Promises and Async/Await. What are some common pitfalls and best practices?
28 Explain the concept of Streams in Node.js. Provide a scenario where using streams would be significantly more beneficial than reading an entire file into memory.
29 How does middleware function in Express.js? Provide an example of how middleware can be used to solve a common web application challenge.
30 When and why would you consider using the Node.js cluster module? Explain its mechanism for distributing load and improving fault tolerance.
31 Deep dive into the execution order of process.nextTick(), setImmediate(), and setTimeout(fn, 0) relative to each other within the Node.js Event Loop. Provide a use case for each.
32 Discuss strategies for handling CPU-bound operations in Node.js applications to prevent the Event Loop from being blocked. What are the limitations and common solutions?
33 You are tasked with designing a highly scalable and resilient microservice using Node.js. Beyond just REST endpoints, what architectural considerations, patterns, or external services would you incorporate to achieve these goals?
34 Explain the Node.js Event Loop mechanism. How does it enable non-blocking I/O, and what are its key phases?
35 Differentiate between require() and import statements in Node.js. When would you choose one over the other, and what are their respective synchronous/asynchronous characteristics?
36 Describe various strategies for error handling in asynchronous Node.js applications, particularly contrasting traditional callback-based error handling with Promise-based or Async/Await error handling. What are common pitfalls?
37 What are Node.js Streams, and when would you use them over traditional methods like reading an entire file into memory? Provide an example of a common use case.
38 Explain the purpose of the Node.js cluster module and Worker Threads. When would you use one versus the other, and what are their limitations in terms of scaling a Node.js application?
39 You are building a real-time chat application. Discuss the pros and cons of using WebSockets versus traditional REST APIs for the communication layer in a Node.js backend. What architectural considerations would you have?
40 How does Node.js handle CPU-bound tasks, given its single-threaded nature for JavaScript execution? Discuss potential bottlenecks and strategies to mitigate them.
41 What are some common security vulnerabilities in Node.js applications, and how can you mitigate them? Provide at least three examples.
42 Describe the concept of "backpressure" in Node.js Streams. Why is it important, and how would you implement flow control to handle a slow consumer with a fast producer?
43 Explain the significance of the package-lock.json file. How does it differ from package.json, and why is it crucial for maintaining consistent dependency versions across development environments and deployments?
44 Explain the concept of the Node.js Event Loop. How does it enable non-blocking I/O operations, and what are its main phases?
45 Differentiate between process.nextTick(), setTimeout(fn, 0), and setImmediate(). When would you use each, and what is their execution order relative to each other within an Event Loop iteration?
46 [Describe the key differences between Comm

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发布日期2026年8月1日
最后更新2026年9月18日
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