Javatpoint Node Js Interview Questions
Node.js Interview Questions and Answers from Javatpoint
Javatpoint Node Js Interview Questions
Javatpoint Node.js interview questions provide a comprehensive overview of fundamental Node.js concepts, best practices, and common technical challenges faced by developers. By practicing these questions, candidates can enhance their understanding of Node.js, its ecosystem, and the key skills required for a successful software development role. They cover topics such as Node.js architecture, asynchronous programming, event loop, modules, error handling, and performance optimization.
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1 - What is JavaScript?
A client side scripting language that adds interactivity to web pages.
2) What are the primitive data types in JavaScript?
Number, string, boolean, undefined, null, symbol, and BigInt.
3) What is the difference between ‘==’ and ‘===’ operators?
‘==’ performs loose comparison, converting operands to a common type before comparing, while ‘===’ performs strict comparison, comparing both value and type.
4) What is an array in JavaScript?
A collection of ordered, indexed elements that can hold any type of value.
5) What is the purpose of the ‘this’ keyword?
Refers to the current object that is invoking a method.
6) What are closures in JavaScript?
Functions that have access to the variables of the scope in which they were declared, even after the scope has ended.
7) What is the difference between ‘let’ and ‘const’ declarations?
‘let’ declares variables that can be reassigned, while ‘const’ declares constants that cannot be changed after initialization.
8) What is the event loop in JavaScript?
A mechanism that handles asynchronous tasks by placing them in a queue and executing them in a non blocking manner.
9) What is Node.js?
A JavaScript runtime environment that allows writing server side applications.
10) What are some popular frameworks for building web applications in Node.js?
Express, React, Angular, Vue.js, and Next.js.
11 - How do you handle errors in Node.js?
Using the ‘try’ and ‘catch’ blocks, or with the ‘async/await’ syntax.
12) What is a module in Node.js?
A self contained piece of code that can be imported and reused in other projects.
13) How do you manage packages in Node.js?
Using a package manager such as NPM (Node Package Manager).
14) What is the purpose of the ‘package.json’ file?
Stores metadata about a Node.js project, including project dependencies.
15) How do you create a HTTP server in Node.js?
Using the ‘http’ module to create a server that listens on a specific port.
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- Course Overview
- This course covers essential Node.js interview questions, focusing on core concepts, frameworks, and best practices. It prepares candidates for technical interviews by providing a comprehensive understanding of Node.js, its architecture, and its application in web development.
- Course Description
- This course covers fundamental and advanced concepts of Node.js essential for aceing job interviews. It provides a comprehensive overview of Node.js architecture, event-driven programming, core modules, asynchronous operations, RESTful API development, testing, and debugging, equipping you with the knowledge and skills to succeed in technical interviews.
- Key Features
- 1 - Comprehensive Tool Coverage: Provides hands-on training with a range of industry-standard testing tools, including Selenium, JIRA, LoadRunner, and TestRail.
- 2) Practical Exercises: Features real-world exercises and case studies to apply tools in various testing scenarios.
- 3) Interactive Learning: Includes interactive sessions with industry experts for personalized feedback and guidance.
- 4) Detailed Tutorials: Offers extensive tutorials and documentation on tool functionalities and best practices.
- 5) Advanced Techniques: Covers both fundamental and advanced techniques for using testing tools effectively.
- 6) Data Visualization: Integrates tools for visualizing test metrics and results, enhancing data interpretation and decision-making.
- 7) Tool Integration: Teaches how to integrate testing tools into the software development lifecycle for streamlined workflows.
- 8) Project-Based Learning: Focuses on project-based learning to build practical skills and create a portfolio of completed tasks.
- 9) Career Support: Provides resources and support for applying learned skills to real-world job scenarios, including resume building and interview preparation.
- 10) Up-to-Date Content: Ensures that course materials reflect the latest industry standards and tool updates.
Benefits of taking our course
Functional Tools
1 - Node.js: A JavaScript runtime environment that allows developers to build server side web applications and other types of server side applications. It is used for building high performance, scalable, and real time applications.
2) JavaScript: A dynamic, interpreted high level programming language that is used both for client side and server side development. It is a popular language for web development and is responsible for the behavior and interactivity of web pages.
3) Express.js: A web framework for Node.js that provides a set of features and tools for building web applications. It is used for creating fast, scalable, and feature rich web applications.
4) MongoDB: A document oriented database management system that uses JSON like documents to store data. It is a popular database for storing and managing data in Node.js applications.
5) Mongoose: A Node.js library that provides an object oriented interface for MongoDB. It allows developers to interact with MongoDB in a more organized and efficient manner.
6) Cloud9: An online integrated development environment (IDE) that allows developers to write, run, and debug code in the cloud. It is used for collaborative coding and offers a variety of tools and features for web development.
- Answer questions thoroughly and accurately. The more points you get for your answers, the more points you'll earn overall.
- Ask questions that are relevant to the topic.* Questions that are off topic or irrelevant will not earn you any points.
- Be active in the community.* The more you participate in the community, the more points you'll earn. This includes answering questions, asking questions, and commenting on other people's posts.
- Earn badges.* Badges are awarded for completing certain tasks, such as answering a certain number of questions or earning a certain number of points. Badges can earn you additional points.
- Invite your friends.* When you invite your friends to join the community, you'll earn points for each friend who joins.
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