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Node.js & Express Interview Questions

Questions
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What is Node.js, and how does it handle asynchronous operations?
Explain the event loop in Node.js and its significance in managing concurrency.
Describe how to set up a basic Express.js server. What are the primary components of an Express appl
What is middleware in Express, and how do you use it to handle requests and responses?
Explain the difference between blocking and non-blocking I/O in Node.js with an example.
How would you implement error handling in an Express application? Provide a code snippet.
Discuss the role of the package.json file in a Node.js project. What information can you find in it?
How do you manage dependencies in a Node.js application? Explain the difference between installation
What is the purpose of the `req` and `res` objects in Express, and how can you use them to read clie
Explain how routing works in Express. How do you define routes and parameters?
Describe how to connect an Express application to a MongoDB database using Mongoose. Provide a brief
How would you implement authentication in a Node.js and Express application? Discuss strategies and
What is CORS, and why is it important in web applications? How can you enable CORS in your Express a
Explain how you would use environment variables in a Node.js application. Why are they important?
What are the differences between synchronous and asynchronous functions in JavaScript? Provide examp
How would you implement session management in Express applications? Discuss using sessions and cooki
Explain the concept of Promises and async/await in JavaScript. How do they help with asynchronous pr
Describe how to implement file uploads in an Express application. What middleware might you use?
Discuss the importance of validation in web applications. How can you validate data in an Express ap
How do you protect your Node.js application from common security vulnerabilities like SQL Injection
Explain what RESTful APIs are and their principles. How would you design a RESTful API using Express
How can you implement logging in a Node.js application? Discuss libraries you might use and the sign
Describe how to use Socket.IO with an Express application for real-time communication. Provide an ex
What are the differences between a monolithic and microservices architecture? How does Node.js fit i
How would you set up a development and production environment for a Node.js application? Discuss bes
Discuss how load balancing works with Node.js applications. What techniques can you use to scale you
Explain the concept of clustering in Node.js. How can it improve the performance of your application
What is the purpose of using a reverse proxy server like Nginx in front of a Node.js application?
Describe how to handle versioning in a RESTful API developed with Express. What strategies would you
How would you implement rate limiting in your Express application to prevent abuse?
Discuss the use of template engines in Express. How would you render a dynamic web page using a temp
Explain how you can integrate GraphQL into a Node.js application and compare it with REST APIs.
What are webhooks, and how can you implement them in an Express application? Provide a use case.
How do you optimize the performance of your Node.js application? Discuss techniques and tools you mi
Explain the purpose of the "next" function in Express middleware and provide a scenario of its use.
Describe how to perform unit testing in a Node.js and Express application. What frameworks would you
Discuss how to handle file storage in a Node.js application, comparing local file storage with cloud
Explain the concept of service workers and how they work with Node.js applications.
How do you set up and use WebSockets in a Node.js application? Discuss potential use cases.
Describe the process of deploying a Node.js and Express application on a platform like Heroku. What

What is Node.js, and how does it handle asynchronous operations?