Node Js Interview Questions
node.js Interview Questions
Node Js Interview Questions
In a Node.js job interview, candidates may be asked about their understanding of key concepts such as asynchronous programming, event-driven architecture, modules, streams, and error handling in Node.js applications. They may also be expected to discuss their experience with key Node.js frameworks like Express.js, their knowledge of Node.js best practices, and their ability to optimize code performance and troubleshoot common Node.js issues. Additionally, questions related to database interactions with Node.js, RESTful API design, security considerations, and testing practices specific to Node.js applications may also be part of the interview process. Being prepared to articulate their approach to problem-solving, debugging techniques, and familiarity with common Node.js features and tools will help candidates succeed in a Node.js interview.
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1 - What is Node.js?
Node.js is an open source, server side platform built on Google Chrome's V8 JavaScript engine that allows developers to run javascript code outside the browser. It is event driven and non blocking, making it efficient for building scalable and real time applications.
2) Explain the difference between Node.js and JavaScript.
Node.js is a runtime environment that allows you to run JavaScript code on the server side, while JavaScript is a programming language that is used for client side scripting in web development.
3) How does Node.js handle asynchronous operations?
Node.js uses event driven architecture and non blocking I/O operations to handle asynchronous tasks efficiently. It employs callbacks, promises, and async/await to manage asynchronous operations.
4) What is NPM?
NPM (Node Package Manager) is the default package manager for Node.js that allows developers to easily install, manage, and share reusable code packages and dependencies for their Node.js projects.
5) How can you create a simple HTTP server in Node.js?
You can create a simple HTTP server in Node.js using the built in `http` module. By requiring the `http` module, you can create an instance of the `http.Server` object and listen to a specified port for incoming HTTP requests.
6) What is the purpose of the Express.js framework in Node.js?
Express.js is a popular web application framework for Node.js that simplifies the process of building web applications by providing a robust set of features for routing, middleware, and template engines.
7) How does Node.js handle errors in applications?
Node.js provides a mechanism for handling errors using try/catch blocks for synchronous code and utilizing error first callbacks for asynchronous operations. Additionally, you can use the `process.on('uncaughtException')` event to catch unhandled exceptions.
8) Explain the concept of streams in Node.js.
Streams in Node.js are objects that allow you to read and write data continuously. They are particularly useful for handling large amounts of data efficiently, as they enable you to process data in chunks rather than loading the entire dataset into memory.
9) What is the event loop in Node.js?
The event loop is a crucial component of Node.js that allows it to handle multiple asynchronous operations simultaneously. It continuously checks for events in the event queue and executes callback functions when events are ready to be processed.
10) How can you debug Node.js applications?
Node.js provides built in debugging features such as the `inspect` flag and the `Node.js` inspector protocol that allow developers to debug their applications using tools like Chrome DevTools or Visual Studio Code for inspecting and debugging Node.js applications.
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