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Node.js

100 Node.js interview questions

Only coding challenges
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Node.js Basics


  • 1.

    What is Node.js and why is it used?

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  • 2.

    How does Node.js handle child threads?

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  • 3.

    Describe the event-driven programming in Node.js.

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  • 4.

    What is the event loop in Node.js?

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  • 5.

    What is the difference between Node.js and traditional web server technologies?

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  • 6.

    Explain what “non-blocking” means in Node.js.

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  • 7.

    How do you update Node.js to the latest version?

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  • 8.

    What is “npm” and what is it used for?

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  • 9.

    How do you manage packages in a Node.js project?

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  • 10.

    What is a package.json file?

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Node.js Core Modules


  • 11.

    Describe some of the core modules of Node.js.

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  • 12.

    How do you create a simple server in Node.js using the HTTP module?

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  • 13.

    Explain the purpose of the File System (fs) module.

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  • 14.

    What is the Buffer class in Node.js?

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  • 15.

    What are streams in Node.js and what types are available?

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  • 16.

    How do you read and write files in Node.js?

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  • 17.

    How do you use the EventEmitter in Node.js?

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  • 18.

    What is the QueryString module?

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  • 19.

    How do you manage path operations in Node.js?

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Asynchronous Programming


  • 20.

    What are callbacks in Node.js?

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  • 21.

    What is callback hell and how can it be avoided?

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  • 22.

    Explain promises in Node.js.

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  • 23.

    How do async/await functions work in Node.js?

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  • 24.

    What is the difference between synchronous and asynchronous methods in the fs module?

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Networking in Node.js


  • 25.

    How does Node.js handle HTTP requests and responses?

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  • 26.

    What is Express.js and why is it important for Node.js?

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  • 27.

    How do you create a RESTful API with Node.js?

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  • 28.

    What is middleware in the context of Node.js?

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  • 29.

    How do you ensure security in HTTP headers with Node.js?

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Error Handling & Debugging


  • 30.

    How do you handle errors in Node.js?

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  • 31.

    Describe some error first callback patterns in Node.js.

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  • 32.

    What are some common debugging techniques for Node.js applications?

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  • 33.

    Explain process.nextTick().

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  • 34.

    What is the global object in Node.js?

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Testing in Node.js


  • 35.

    What frameworks are available for testing Node.js applications?

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  • 36.

    Explain the concept of mocking in Node.js.

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  • 37.

    Why is benchmarking important in Node.js?

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  • 38.

    How do you test an HTTP server in Node.js?

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Node.js with Databases


  • 39.

    How do you connect a MySQL database with Node.js?

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  • 40.

    Explain how NoSQL databases like MongoDB can be used with Node.js.

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  • 41.

    What’s the role of ORM in Node.js?

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Node.js Performance


  • 42.

    How can you monitor the performance of a Node.js app?

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  • 43.

    What is clustering in Node.js and how does it work?

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  • 44.

    How can you prevent memory leaks in a Node.js application?

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  • 45.

    Explain the use of the --inspect flag in Node.js.

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Concurrency in Node.js


  • 46.

    How does Node.js handle concurrency?

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  • 47.

    What is the difference between process and child_process modules?

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  • 48.

    How do worker threads work in Node.js?

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Node.js and Microservices


  • 49.

    How is Node.js used in microservices architecture?

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  • 50.

    Explain inter-process communication in a Node.js microservice architecture.

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Security in Node.js


  • 51.

    What are some common security best practices for Node.js applications?

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  • 52.

    How would you protect your Node.js application from XSS attacks?

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  • 53.

    What are environment variables and how could you use them in Node.js?

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Node.js and WebSockets


  • 54.

    What are WebSockets and how do they work with Node.js?

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  • 55.

    How do you set up a WebSocket server in Node.js?

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Node.js Deployment


  • 56.

    How do you deploy a Node.js application in production?

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  • 57.

    What is PM2 and how is it used in Node.js?

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  • 58.

    Explain how you would use Docker with a Node.js application.

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Node.js and Version Control


  • 59.

    How do you manage versioning of a Node.js API?

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  • 60.

    What are semantic versioning (semver) and its importance in Node.js development?

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Node.js Advanced Topics


  • 61.

    What is the difference between exports and module.exports in Node.js?

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  • 62.

    How can you create a simple TCP server in Node.js?

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  • 63.

    What is REPL in Node.js?

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  • 64.

    Explain the role of a reverse proxy with Node.js applications.

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  • 65.

    How do Node.js streams enhance performance?

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Frameworks and Libraries in Node.js


  • 66.

    Describe some popular frameworks and libraries in the Node.js ecosystem.

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  • 67.

    How is Koa different from Express.js?

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  • 68.

    What is NestJS and when would you choose it for your Node.js project?

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  • 69.

    What are the benefits of using TypeScript with Node.js?

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Integrations & Third-Party Node.js Modules


  • 70.

    How would you integrate a Node.js app with a third-party API?

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  • 71.

    What is Socket.IO and how does it work with Node.js?

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  • 72.

    Explain how GraphQL can be used with Node.js.

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Node.js with Frontend Technologies


  • 73.

    How does Node.js interact with frontend frameworks like Angular or React?

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  • 74.

    What is server-side rendering and how can it be achieved with Node.js?

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Node.js Best Practices


  • 75.

    What are some coding conventions and best practices in Node.js?

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  • 76.

    How do you ensure your Node.js application adheres to the twelve-factor app principles?

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  • 77.

    What is code linting and how is it applied in Node.js?

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Scaling Node.js Applications


  • 78.

    What are some strategies for scaling Node.js applications?

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  • 79.

    How do you handle session management in a scaled Node.js application?

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  • 80.

    How does the use of microservices affect the scalability of a Node.js application?

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Node.js and Message Queues


  • 81.

    What are message queues and how are they used in Node.js?

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  • 82.

    How do you implement RabbitMQ with Node.js?

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  • 83.

    What is the significance of ZeroMQ in Node.js applications?

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Node.js and Cloud Services


  • 84.

    How do cloud platforms like AWS, Azure, or GCP facilitate Node.js application deployment?

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  • 85.

    What is serverless architecture, and how does it relate to Node.js?

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Environment Management


  • 86.

    How can you manage multiple Node.js versions on the same machine?

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  • 87.

    What are .env files and how do they work in a Node.js application?

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  • 88.

    Describe the usage of the config module in Node.js.

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Node.js and Continuous Integration/Continuous Deployment (CI/CD)


  • 89.

    What is continuous integration/deployment and how is it implemented for Node.js apps?

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  • 90.

    How do you set up a CI/CD pipeline for a Node.js project?

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Node.js Interview Problem Solving and Scenarios


  • 91.

    How would you troubleshoot a slow running Node.js application?

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  • 92.

    Describe how to handle file uploads in a Node.js application.

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  • 93.

    How would you handle heavy computation tasks in a Node.js application?

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Node.js and DevOps


  • 94.

    What is the role of a Node.js application in DevOps?

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  • 95.

    Describe containerization and its benefits for Node.js applications.

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Node.js and IoT


  • 96.

    How is Node.js used in IoT (Internet of Things)?

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  • 97.

    What would you consider when developing a Node.js application for IoT devices?

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Node.js and Machine Learning


  • 98.

    Can you use Node.js for machine learning? If so, how?

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  • 99.

    What are some machine learning libraries or tools available for Node.js?

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APIs and Node.js


  • 100.

    What are best practices for designing RESTful APIs in Node.js?

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