Interview Questions In Node Js

Interview Questions In Node Js

Node.js Interview Questions and Answers

Interview Questions In Node Js

Interview questions in Node.js are valuable tools for assessing a candidate's proficiency in core Node.js concepts such as event-driven architecture, asynchronous programming, and handling HTTP requests. They evaluate the understanding of essential Node.js modules and frameworks, including Express.js, Mongoose, and Passport.js. By exploring topics like REST APIs, concurrency, and database handling, these questions provide insight into the candidate's ability to build performant, scalable, and secure Node.js applications.

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1 - What is Node.js?

     Node.js is a platform for executing JavaScript code on the server side.

2) What is the difference between synchronous and asynchronous operations in Node.js?

     Synchronous operations block the event loop, while asynchronous operations do not.

3) What is the event loop in Node.js?

     The event loop is a mechanism that listens for and responds to events, such as incoming HTTP requests.

4) What are modules in Node.js?

     Modules are reusable pieces of code that can be imported into other Node.js applications.

5) What is the difference between require() and import?

     require() is used to import CommonJS modules, while import is used to import ES modules.

6) What is npm?

      npm is a package manager for Node.js.

7) What are the different types of errors in Node.js?

      Errors, Exceptions, and Fatal Errors.

8) How do you handle errors in Node.js?

      Using try…catch blocks or event listeners.

9) What is the global object in Node.js?

      The global object is the root of the Node.js runtime environment.

10) What is the console object in Node.js?

      The console object provides methods for printing to the standard output and error streams.

11 - What is the process object in Node.js?

      The process object represents the current Node.js process.

12) What is the difference between a Buffer and a String in Node.js?

      Buffers represent binary data, while strings represent text data.

13) What is the difference between a ReadableStream and a WritableStream?

      ReadableStream represents a source of data, while WritableStream represents a destination of data.

14) What is the purpose of the pipe() method on streams?

      To connect a readable stream to a writable stream.

15) What is the purpose of the fs module?

      To provide methods for interacting with the file system.

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• Course Overview
• This course provides a comprehensive overview of frequently asked interview questions in Node.js, covering core concepts, modules, event loop, async programming, testing, and debugging.
• Course Description
• Master the art of interviewing for Node.js roles with this comprehensive course. Gain insights into frequently asked questions, including concepts like callback functions, event loops, and asynchronous programming, equipping you with the knowledge and confidence to ace your next interview.
• Key Features
• 1 - Comprehensive Tool Coverage: Provides hands-on training with a range of industry-standard testing tools, including Selenium, JIRA, LoadRunner, and TestRail.
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• 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 server side JavaScript runtime environment widely used for building scalable and efficient web applications.

2) Express.js: A popular web framework for Node.js that provides a robust set of features for building APIs, routing, and middleware.

3) MongoDB: A NoSQL database that offers flexibility and scalability, making it suitable for storing and retrieving large amounts of data.

4) Mongoose: An object relational mapping (ORM) library for MongoDB that simplifies data modeling and interaction.

5) Jest: A testing framework for JavaScript that enables unit testing, integration testing, and mocking.

6) Supertest: A testing framework for Node.js that simplifies API testing and allows for in depth testing of HTTP requests and responses.

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