Node Js Basic Interview Question
node.js Basic Interview Questions
Node Js Basic Interview Question
In a basic Node.js interview, candidates may be asked about their understanding of JavaScript runtime environment, event-driven architecture, asynchronous programming using callbacks, modules and NPM (Node Package Manager), error handling, and common Node.js modules such as fs, http, and events. They may also be expected to explain how Node.js differs from traditional server-side environments like PHP, Ruby on Rails, and Java in terms of non-blocking I/O operations and scalability. Additionally, candidates may be asked about their experience with RESTful APIs, Express framework, and best practices for building scalable and efficient server-side applications using Node.js.
To Download Our Brochure: https://www.justacademy.co/download-brochure-for-free
Message us for more information: +91 9987184296
1 - What is Node.js?
Node.js is an open source, cross platform JavaScript runtime environment that allows developers to run JavaScript code outside of a web browser. It is based on Google Chrome's V8 engine and uses an event driven, non blocking I/O model.
2) How does Node.js handle asynchronous operations?
Node.js uses a single threaded event loop to manage asynchronous operations. When a request is made, Node.js sends it to the event loop, which continues to process other requests without waiting for the first request to complete. Once the asynchronous operation is finished, a callback function is called to handle the result.
3) What is npm?
npm, or Node Package Manager, is the default package manager for Node.js. It allows developers to easily install, manage, and share dependencies and packages for their Node.js projects.
4) How can you handle modules in Node.js?
Modules in Node.js can be handled using the “require” function to import external modules or files. Modules can also be created using the “exports” or “module.exports” objects to expose functions or variables for use in other parts of the application.
5) Explain the difference between process.nextTick() and setImmediate() in Node.js.
process.nextTick() and setImmediate() are both used to schedule the execution of a callback function, but they have different priorities. process.nextTick() schedules the callback to be executed on the current phase of the event loop, before any I/O events. setImmediate(), on the other hand, will execute the callback at the beginning of the next event loop iteration.
6) How can you handle errors in Node.js?
Errors in Node.js can be handled using try catch blocks to catch synchronous errors and by using callback functions with error parameters to handle asynchronous errors. Additionally, the “process” object provides the “uncaughtException” event to catch unhandled exceptions.
7) What is the purpose of the package.json file in a Node.js project?
The package.json file is a metadata file in Node.js projects that contains information about the project, such as dependencies, scripts, and version numbers. It also allows developers to easily manage and share project configurations.
8) How can you create an HTTP server in Node.js?
To create an HTTP server in Node.js, you can use the built in “http” module. By creating a new instance of the HTTP server and specifying a request handling function, you can listen for incoming HTTP requests and send responses back to clients.
9) What are streams in Node.js and how are they useful?
Streams in Node.js are objects that allow you to read or write data continuously. They are useful for handling large amounts of data or processing data in chunks, which can improve performance and memory efficiency compared to reading or writing data all at once.
10) What is middleware in Express.js?
Middleware in Express.js are functions that have access to the request and response objects in an Express application. They can perform tasks such as logging, authentication, or error handling before passing control to the next middleware function in the chain. Express.js uses middleware to add functionality to the application's request handling pipeline.
11) How can you handle file uploads in Node.js?
File uploads in Node.js can be handled using middleware such as “multer” in combination with the Express.js framework. Multer allows you to parse multipart form data in HTTP requests and save uploaded files to the server's file system.
12) What is callback hell and how can you avoid it in Node.js?
Callback hell refers to the situation where multiple nested callbacks make the code hard to read and maintain. To avoid callback hell in Node.js, you can use named functions, Promises, or async/await syntax to handle asynchronous operations in a more readable and structured way.
13) What is clustering in Node.js?
To Download Our Brochure: Click Here
Message us for more information: +91 9987184296
Clustering in Node.js refers to the feature that allows you to create multiple instances of the application to take advantage of multi core systems. By using the “cluster” module, you can spawn child processes to handle incoming requests and distribute the workload across multiple CPU cores.
14) What is the importance of event emitters in Node.js?
Event emitters in Node.js are objects that allow you to emit events and attach listeners to them. They are important for building event driven applications where different parts of the system can communicate asynchronously. By emitting and handling events, you can create decoupled and modular code that reacts to various actions or states.
Browse our course links : https://www.justacademy.co/all-courses
To Join our FREE DEMO Session: Click Here
Contact Us for more info:
- Message us on Whatsapp: +91 9987184296
- Email id: info@justacademy.co
Selenium 4 Years Experience Interview Questions
Ui Ux Interview Questions And Answers
Java Selenium Interview Questions For 5 Years Experience
