Node Js Basic Interview Question
Common Node.js Interview Questions for Beginners
Node Js Basic Interview Question
Node.js is a popular open-source, cross-platform JavaScript runtime environment used for developing server-side and networking applications. It is widely adopted due to its event-driven, non-blocking I/O model, which enables concurrent execution and scalability, making it suitable for real-time applications, APIs, and streaming services. Node.js is also highly extensible with a vast ecosystem of third-party modules, providing developers with a wide range of functionalities and tools to enhance their applications.
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1 - What is the difference between Node.js and JavaScript?
Answer: Node.js is a runtime environment that allows you to run JavaScript code on the server side. JavaScript is a scripting language that is used to create dynamic web pages.
2) What is the event loop in Node.js?
Answer: The event loop is a mechanism that allows Node.js to handle multiple requests concurrently. When an event occurs, such as a user request, the event loop calls the appropriate event handler.
3) What is the difference between a synchronous and asynchronous function?
Answer: A synchronous function executes code sequentially, while an asynchronous function does not. Asynchronous functions allow Node.js to perform other tasks while waiting for a response from an external resource.
4) What is a callback function?
Answer: A callback function is a function that is passed as an argument to another function and is called when the other function has completed its task.
5) What is a promise?
Answer: A promise is an object that represents the eventual completion or failure of an asynchronous operation.
6) What is a stream?
Answer: A stream is a sequence of data that is read or written sequentially.
7) What is a module?
Answer: A module is a file that contains a set of functions, variables, and classes that can be exported and reused in other modules.
8) What is a package manager?
Answer: A package manager is a tool that helps you install, manage, and update Node.js modules.
9) What is the difference between Node.js and Apache?
Answer: Node.js is an event driven, non blocking I/O platform, while Apache is a web server that uses a blocking I/O model.
10) What are some of the advantages of using Node.js?
Answer: Node.js is cross platform, fast, scalable, and has a large ecosystem of modules.
11 - What are some of the disadvantages of using Node.js?
Answer: Node.js is not as mature as some other programming languages and can be less efficient when handling large amounts of data.
12) What are some of the best practices for writing Node.js code?
Answer: Some best practices for writing Node.js code include using asynchronous functions, avoiding blocking I/O operations, and properly handling errors.
13) What are some of the common mistakes that beginners make when writing Node.js code?
Answer: Some common mistakes that beginners make when writing Node.js code include not using asynchronous functions, blocking I/O operations, and not properly handling errors.
14) What are some of the resources that are available to help you learn Node.js?
Answer: Some resources that are available to help you learn Node.js include the Node.js documentation, tutorials, and online courses.
15) What are some of the popular frameworks and libraries for Node.js?
Answer: Some popular frameworks and libraries for Node.js include Express, React, and jQuery.
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- Course Overview
- Gain a comprehensive understanding of Node.js fundamentals through expert-led lessons. Explore key concepts, best practices, and common interview questions. This course empowers you to confidently prepare for and excel in Node.js interviews.
- Course Description
- This course covers essential interview questions for Node.js beginners. It explores fundamental Node.js concepts, including event loops, modules, streams, and HTTP servers. By mastering these concepts, candidates can confidently answer questions about Node.js's architecture, its event-driven nature, and common coding problems.
- 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
Open source JavaScript runtime environment built on Chrome's V8 JavaScript engine.
Enables the execution of JavaScript outside of a browser.
Supports asynchronous and event driven I/O, making it ideal for building high performance and scalable web applications.
2) Express.js
Minimal and flexible web framework for Node.js.
Provides a set of middleware and utilities for developing web and mobile applications.
Simplifies the creation of routes, middleware, and error handling.
3) MongoDB
Document oriented database that stores data as JSON documents.
Flexible schema design and scalability make it a popular choice for web applications.
Supports rich queries and aggregation operations.
4) Cloud Computing Platforms
Platforms like AWS, Azure, or GCP provide infrastructure and services to build, deploy, and manage applications in the cloud.
Allow developers to focus on application logic without worrying about server maintenance or scalability.
Offer a wide range of services, including storage, compute, databases, and networking.
5) Version Control Systems (Git)
Tool used to track and manage changes to code over time.
Allows developers to collaborate and contribute to a project while maintaining a history of revisions.
Facilitates the sharing of code between team members and the tracking of bug fixes and enhancements.
6) Testing Frameworks
Libraries like Mocha or Jest provide tools and assertions for testing Node.js applications.
Allow developers to write automated tests to validate the behavior and functionality of their code.
Ensure code quality, improve reliability, and detect errors early on in the development process.
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