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1.
What is Node.js and why is it used?
Answer:
Node.js Basics
- 2.
How does Node.js handle child threads?
Answer: - 3.
Describe the event-driven programming in Node.js.
Answer: - 4.
What is the event loop in Node.js?
Answer: - 5.
What is the difference between Node.js and traditional web server technologies?
Answer: - 6.
Explain what “non-blocking” means in Node.js.
Answer: - 7.
How do you update Node.js to the latest version?
Answer: - 8.
What is “npm” and what is it used for?
Answer: - 9.
How do you manage packages in a Node.js project?
Answer: - 10.
What is a package.json file?
Answer:
Node.js Core Modules
- 11.
Describe some of the core modules of Node.js.
Answer: - 12.
How do you create a simple server in Node.js using the HTTP module?
Answer: - 13.
Explain the purpose of the File System (fs) module.
Answer: - 14.
What is the Buffer class in Node.js?
Answer: - 15.
What are streams in Node.js and what types are available?
Answer: - 16.
How do you read and write files in Node.js?
Answer: - 17.
How do you use the EventEmitter in Node.js?
Answer: - 18.
What is the QueryString module?
Answer: - 19.
How do you manage path operations in Node.js?
Answer:
Asynchronous Programming
- 20.
What are callbacks in Node.js?
Answer: - 21.
What is callback hell and how can it be avoided?
Answer: - 22.
Explain promises in Node.js.
Answer: - 23.
How do async/await functions work in Node.js?
Answer: - 24.
What is the difference between synchronous and asynchronous methods in the fs module?
Answer:
Networking in Node.js
- 25.
How does Node.js handle HTTP requests and responses?
Answer: - 26.
What is Express.js and why is it important for Node.js?
Answer: - 27.
How do you create a RESTful API with Node.js?
Answer: - 28.
What is middleware in the context of Node.js?
Answer: - 29.
How do you ensure security in HTTP headers with Node.js?
Answer:
Error Handling & Debugging
- 30.
How do you handle errors in Node.js?
Answer: - 31.
Describe some error first callback patterns in Node.js.
Answer: - 32.
What are some common debugging techniques for Node.js applications?
Answer: - 33.
Explain process.nextTick().
Answer: - 34.
What is the global object in Node.js?
Answer:
Testing in Node.js
- 35.
What frameworks are available for testing Node.js applications?
Answer: - 36.
Explain the concept of mocking in Node.js.
Answer: - 37.
Why is benchmarking important in Node.js?
Answer: - 38.
How do you test an HTTP server in Node.js?
Answer:
Node.js with Databases
- 39.
How do you connect a MySQL database with Node.js?
Answer: - 40.
Explain how NoSQL databases like MongoDB can be used with Node.js.
Answer: - 41.
What’s the role of ORM in Node.js?
Answer:
Node.js Performance
- 42.
How can you monitor the performance of a Node.js app?
Answer: - 43.
What is clustering in Node.js and how does it work?
Answer: - 44.
How can you prevent memory leaks in a Node.js application?
Answer: - 45.
Explain the use of the
--inspectflag in Node.js.Answer:
Concurrency in Node.js
- 46.
How does Node.js handle concurrency?
Answer: - 47.
What is the difference between process and child_process modules?
Answer: - 48.
How do worker threads work in Node.js?
Answer:
Node.js and Microservices
- 49.
How is Node.js used in microservices architecture?
Answer: - 50.
Explain inter-process communication in a Node.js microservice architecture.
Answer:
Security in Node.js
- 51.
What are some common security best practices for Node.js applications?
Answer: - 52.
How would you protect your Node.js application from XSS attacks?
Answer: - 53.
What are environment variables and how could you use them in Node.js?
Answer:
Node.js and WebSockets
- 54.
What are WebSockets and how do they work with Node.js?
Answer: - 55.
How do you set up a WebSocket server in Node.js?
Answer:
Node.js Deployment
- 56.
How do you deploy a Node.js application in production?
Answer: - 57.
What is PM2 and how is it used in Node.js?
Answer: - 58.
Explain how you would use Docker with a Node.js application.
Answer:
Node.js and Version Control
- 59.
How do you manage versioning of a Node.js API?
Answer: - 60.
What are semantic versioning (semver) and its importance in Node.js development?
Answer:
Node.js Advanced Topics
- 61.
What is the difference between exports and module.exports in Node.js?
Answer: - 62.
How can you create a simple TCP server in Node.js?
Answer: - 63.
What is REPL in Node.js?
Answer: - 64.
Explain the role of a reverse proxy with Node.js applications.
Answer: - 65.
How do Node.js streams enhance performance?
Answer:
Frameworks and Libraries in Node.js
- 66.
Describe some popular frameworks and libraries in the Node.js ecosystem.
Answer: - 67.
How is Koa different from Express.js?
Answer: - 68.
What is NestJS and when would you choose it for your Node.js project?
Answer: - 69.
What are the benefits of using TypeScript with Node.js?
Answer:
Integrations & Third-Party Node.js Modules
- 70.
How would you integrate a Node.js app with a third-party API?
Answer: - 71.
What is Socket.IO and how does it work with Node.js?
Answer: - 72.
Explain how GraphQL can be used with Node.js.
Answer:
Node.js with Frontend Technologies
- 73.
How does Node.js interact with frontend frameworks like Angular or React?
Answer: - 74.
What is server-side rendering and how can it be achieved with Node.js?
Answer:
Node.js Best Practices
- 75.
What are some coding conventions and best practices in Node.js?
Answer: - 76.
How do you ensure your Node.js application adheres to the twelve-factor app principles?
Answer: - 77.
What is code linting and how is it applied in Node.js?
Answer:
Scaling Node.js Applications
- 78.
What are some strategies for scaling Node.js applications?
Answer: - 79.
How do you handle session management in a scaled Node.js application?
Answer: - 80.
How does the use of microservices affect the scalability of a Node.js application?
Answer:
Node.js and Message Queues
- 81.
What are message queues and how are they used in Node.js?
Answer: - 82.
How do you implement RabbitMQ with Node.js?
Answer: - 83.
What is the significance of ZeroMQ in Node.js applications?
Answer:
Node.js and Cloud Services
- 84.
How do cloud platforms like AWS, Azure, or GCP facilitate Node.js application deployment?
Answer: - 85.
What is serverless architecture, and how does it relate to Node.js?
Answer:
Environment Management
- 86.
How can you manage multiple Node.js versions on the same machine?
Answer: - 87.
What are .env files and how do they work in a Node.js application?
Answer: - 88.
Describe the usage of the config module in Node.js.
Answer:
Node.js and Continuous Integration/Continuous Deployment (CI/CD)
- 89.
What is continuous integration/deployment and how is it implemented for Node.js apps?
Answer: - 90.
How do you set up a CI/CD pipeline for a Node.js project?
Answer:
Node.js Interview Problem Solving and Scenarios
- 91.
How would you troubleshoot a slow running Node.js application?
Answer: - 92.
Describe how to handle file uploads in a Node.js application.
Answer: - 93.
How would you handle heavy computation tasks in a Node.js application?
Answer:
Node.js and DevOps
- 94.
What is the role of a Node.js application in DevOps?
Answer: - 95.
Describe containerization and its benefits for Node.js applications.
Answer:
Node.js and IoT
- 96.
How is Node.js used in IoT (Internet of Things)?
Answer: - 97.
What would you consider when developing a Node.js application for IoT devices?
Answer:
Node.js and Machine Learning
- 98.
Can you use Node.js for machine learning? If so, how?
Answer: - 99.
What are some machine learning libraries or tools available for Node.js?
Answer:
APIs and Node.js
- 100.
What are best practices for designing RESTful APIs in Node.js?
Answer:
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