Node.js Preparation Pack

Learn single-threaded event loop phases, pending I/O callbacks, setImmediate execution, Express middlewares, and clustering.

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Frequently Asked Questions

The Event Loop allows Node.js to run non-blocking, asynchronous I/O tasks on a single thread.

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Node.js Preparation Pack

Question Cards

How would you handle global error boundaries in Express or Node.js backend apps?

What is Node.js and why is it used?

What is the difference between Node.js and JavaScript?

What is npm in Node.js?

What is the Event Loop in Node.js?

What is the difference between synchronous and asynchronous programming in Node.js?

What is Express.js and why is it commonly used with Node.js?

How would you optimize the performance of a Node.js application?

What are Streams in Node.js and when should they be used?

How does Node.js handle high concurrency despite being single-threaded?

What is the difference between CommonJS and ES Modules in Node.js?

What is the purpose of package.json in Node.js projects?

What is package-lock.json and why is it important?

What are callbacks in Node.js?

What are Promises in Node.js?

What is async/await in Node.js?

What is a Buffer in Node.js?

What is the File System module in Node.js?

What are child processes in Node.js?

What is clustering in Node.js?

What is the difference between process.nextTick() and setImmediate()?

What is EventEmitter in Node.js?

How does garbage collection work in Node.js?

What causes memory leaks in Node.js applications?

What is REST API development in Node.js?

How do you secure an Express.js application?

What is CORS in Node.js?

What is JWT authentication in Node.js?

How does Node.js connect with databases?

What is connection pooling in Node.js?

What are worker threads in Node.js?

What is rate limiting in Node.js APIs?

How do you handle file uploads in Node.js?

What is logging in Node.js applications?

What is PM2 in Node.js?

How do you scale a Node.js application?

What are microservices in Node.js?

What is WebSocket in Node.js?

What is Docker usage with Node.js applications?

How do you test Node.js applications?

What is the difference between authentication and authorization in Node.js?

What are environment variables and why are they used in Node.js?

What is dotenv in Node.js?

What is MVC architecture in Node.js applications?

What is middleware chaining in Express.js?

How does request handling work in Express.js?

What are HTTP status codes commonly used in Node.js APIs?

What is API versioning in Node.js?

How do you validate request data in Node.js?

What is schema validation in Node.js?

What is Redis and how is it used with Node.js?

How does caching improve Node.js application performance?

What are message queues in Node.js?

What is background job processing in Node.js?

How do you handle transactions in Node.js applications?

What is GraphQL and how can Node.js support it?

What is rate limiting middleware in Express?

How do you handle errors in async Express routes?

What is graceful shutdown in Node.js?

How do you monitor Node.js application performance?

What is load balancing in Node.js?

What is Kubernetes usage with Node.js?

What are health checks in Node.js applications?

What is API throttling in Node.js?

How do you implement pagination in Node.js APIs?

What is dependency injection in Node.js?

What is the singleton pattern in Node.js?

What are Node.js design patterns?

How do you improve security of Node.js dependencies?

Frequently Asked Questions

What is the Event Loop in Node.js?

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