Explain the event loop How to make your app uncrashable Can you call a middleware after sending the response How to block the event loop How can node be concurrent How to get a rabbit from a hat Answer from Deleted User on reddit.com
Reddit
reddit.com › r/node › what are some of the interesting / tough interview questions you faced?
r/node on Reddit: What are some of the interesting / tough interview questions you faced?
November 4, 2023 -
Apart from what is event loop and how nodejs is single threaded, what are some of the interesting questions you faced as part of your NodeJS interview?
To start from me: a question on promisfy
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Explain the event loop How to make your app uncrashable Can you call a middleware after sending the response How to block the event loop How can node be concurrent How to get a rabbit from a hat
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The most memorable and interesting questions were actually never about specific functions, tech, event loop etc., but rather things like: "what problem made you tear out your hair but then very proud when you found a solution and what was that solution?" Everyone can learn and parrot what the event loop is, but everyone will have a different background, faced different hardships, and feels great about different achievements. Of course, sometimes you ask about concepts and their understanding, but those are rather boring questions.
GeeksforGeeks
geeksforgeeks.org › node.js › top-50-express-js-interview-questions-and-answers
Top 50+ Express.js Interview Questions and Answers - 2025 - GeeksforGeeks
September 19, 2025 - Here, we have compiled all Express.js interview questions and answers that will help you during an interview.
How to prepare for Express JS Interview Questions?
How to prepare for Express JS Interview Questions? More on designgurus.io
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November 10, 2024NodeJs interview questions [DISCUSSION]
Hey I have recently had a few and most of the question were starting off with the question whether nodejs is single or multi threaded and then it went onto the next topic which was the event loop. If you need to conduct a nodejs interview or participate in one, I highly recommend you checked out the Turing.com YouTube channel, they have 2-3 full length interviews about nodejs they were really a great help to me while preparing. More on reddit.com
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February 27, 2023What are some of the interesting / tough interview questions you faced?
Explain the event loop How to make your app uncrashable Can you call a middleware after sending the response How to block the event loop How can node be concurrent How to get a rabbit from a hat More on reddit.com
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November 4, 2023[Question] where can I find real node.js interview questions?
Here are a few I got in a recent interview: Explain the JavaScript event loop. Is JavaScript single-threaded or multi-threaded? Explain the difference between synchronous and asynchronous functions, and an example of when each one is a better choice. Explain promises and callback functions. How does async/await differ from promises? Explain the difference between child_process.spawn() and child_process.fork() Give examples of a function expression, a function definition, and an arrow function. Explain the difference between CommonJS and ESModules. What is an event emitter? Is FS.readfile() a synchronous function or asynchronous? Name one important feature added in ES6. You should be able to find the answers to most of these in the Node.js docs, but feel free to let me know if the answer is unclear or you can’t find the answers. More on reddit.com
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Edureka
edureka.co › blog › interview-questions › top-node-js-interview-questions-2016
Top Node.js Interview Questions and Answers in 2025 | Edureka
December 9, 2024 - This blog lists the top Node.js interview questions you might be asked in Nodejs job interviews in 2025 on concepts such as Node.js express, frameworks etc.
GitHub
github.com › Devinterview-io › express-interview-questions
GitHub - Devinterview-io/express-interview-questions: 🟣 Express.js interview questions and answers to help you prepare for your next technical interview in 2025.
🟣 Express.js interview questions and answers to help you prepare for your next technical interview in 2025. - Devinterview-io/express-interview-questions
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Roadmap
roadmap.sh › questions › nodejs
Top 100 Node.js Interview Questions and Answers
CORS is a security feature that prevents a web page from making requests to a different domain. You can handle it on a Node.js web server by setting specific HTTP headers or by using a middleware library like the cors package in Express.js.
Second Talent
secondtalent.com › home › interview guides › top 20 express.js developer interview questions for employers
Top 20 Express.js Developer Interview Questions For Employers [2025] | Second Talent
October 8, 2025 - They should explain that Node.js is single-threaded so clustering utilizes multi-core systems. Discussion should include process managers like PM2, systemd, or container orchestration with Kubernetes. Proper process management ensures high availability and resource utilization. Question 10. What security vulnerabilities should Express developers be aware of, and how do you protect against them?
InterviewBit
interviewbit.com › node-js-interview-questions
Top 30+ Node.js Interview Questions and Answers (2025) - InterviewBit
Answer 4 simple questions & get a career plan tailored for you ... PL in Node.js stands for Read, Eval, Print, and Loop, which further means evaluating code on the go.
Published December 23, 2024
FinalRoundAI
finalroundai.com › blog › expressjs-interview-questions
90+ Express.js Interview Questions
These questions typically cover topics such as middleware, routing, error handling, and performance optimization to gauge the candidate's proficiency and problem-solving skills in building web applications using Express.js.
Medium
medium.com › @arunangshudas › 20-advanced-node-js-interview-questions-and-their-answers-f11c86f4d982
20 Advanced Node.js Interview Questions and Their Answers
February 13, 2025 - Use ORMs like Sequelize, Prisma, or Knex.js. Validate user input before executing queries. ... async function fetchData() { try { let data = await someAsyncFunction(); console.log(data); } catch (error) { console.error("Error:", error); } } ... Answer: Middleware functions in Express.js execute before the final route handler.
SynergisticIT
synergisticit.com › home › express.js interview questions & answers
Express JS Interview Questions for Beginners
September 22, 2025 - Debugging– It is crucial for the successful development of web applications. Express.js can streamline debugging with a debugging mechanism that can pinpoint the exact part of a web application that has bugs.
Zero To Mastery
zerotomastery.io › blog › node-js-interview-questions
Node.js Interview Prep: Questions + Answers (With Code Examples) | Zero To Mastery
Crush your Node.js interview with this ultimate guide! Get clear answers to top questions, from basics to advanced, and ace your job interview!
Simplilearn
simplilearn.com › home › resources › software development › node.js tutorial › top 100+ node.js interview questions and answers for 2026
Top 100+ Node.js Interview Questions and Answers for 2026
November 6, 2025 - Elevate your Node.js interview game with our ultimate guide. Master key concepts and tackle tough questions with confidence. Start acing your interviews today!
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Braintrust
usebraintrust.com › hire › interview-questions › node-js-developers
Node JS Developer Interview Questions
What is the use of a buffer in Node.js? Answer: A buffer is a temporary storage location for raw data, allowing you to manipulate, store, and transfer data to/from streams, file systems, and sockets. 9. Explain the concept of middleware in Express.js. Answer: Middleware functions have access to the request and response objects and the next middleware function.
Turing
turing.com › interview-questions › node-js
100 Node.js Interview Questions And Answers for 2025 - Turing
100 Node.js Interview Questions And Answers for 2025 - Turing
Here are the top 100 Node.js interview questions covering concepts that would help developers in acing technical interviews, and recruiters in finding top Node.js talent
Hirist
hirist.tech › home › top 20 express js interview questions and answers
Top 20 Express JS Interview Questions and Answers (2025) - Hirist Blog
July 11, 2025 - Prepare top express js interview questions on Express.js, Node.js middleware, routing, HTTP methods, error handling & API requests.
Reddit
reddit.com › r/node › nodejs interview questions [discussion]
r/node on Reddit: NodeJs interview questions [DISCUSSION]
February 27, 2023 -
Hello fellow Node developers. What do you think is a good technical question in a NodeJs technical interview? It can either be questions about the mechanics of nodejs, Or a coding exercise like implementing Promises for example.
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Hey I have recently had a few and most of the question were starting off with the question whether nodejs is single or multi threaded and then it went onto the next topic which was the event loop. If you need to conduct a nodejs interview or participate in one, I highly recommend you checked out the Turing.com YouTube channel, they have 2-3 full length interviews about nodejs they were really a great help to me while preparing.
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Describe how you would use a router with Express. How would you implement security on a Node server to throttle potentially malicious requests? Explain what a package.json file is. On the top of my head.
Medium
shikshanas.medium.com › 50-express-js-interview-questions-c80723726b23
50 Express.js interview questions | by Shikshanas | Medium
October 21, 2024 - 50 Express.js interview questions What is Express.js? How do you create a simple server using Express.js? What is middleware in Express.js? How does Express.js differ from other web frameworks? What …
Tutorialswebsite
tutorialswebsite.com › home › web development
Express and Node JS Interview Questions & Answers - Tutorialswebsite
August 1, 2023 - Now, require should be used to access the config.json file. ... Since authentication is an opinionated area which is not ventured by express JS, therefore any authentication scheme can be used in express JS for the authentication of users.
Vskills
vskills.in › interview-questions › express-framework-interview-questions
Top asked Express Framework Interview Questions | Vskills
Here is the list of top asked Interview questions with answers in Express Framework , these questions will help you to prepare for a job in Express Framework