Cognizant Node Js Interview Questions
Cognizant Node.js Interview Questions and Answers
Cognizant Node Js Interview Questions
Cognizant Node.js interview questions help recruiters assess candidates' knowledge and skills in Node.js, a popular JavaScript runtime environment for building scalable and efficient server-side applications. These questions explore concepts such as event-driven architecture, asynchronous programming, RESTful APIs, and best practices for Node.js development. By answering these questions effectively, candidates can demonstrate their understanding of Node.js' core principles and their ability to apply them in real-world projects.
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1 - Describe the key differences between synchronous and asynchronous programming in Node.js.
Answer: Synchronous code executes sequentially, blocking the event loop, while asynchronous code uses callbacks or promises to execute later, allowing the event loop to continue processing other tasks.
2) Explain the concept of event loop in Node.js.
Answer: The event loop is a core component of Node.js that manages asynchronous execution. It continuously checks for pending events and executes their callbacks or resolves their promises in the order they were received.
3) How do you handle errors in Node.js?
Answer: Use the `try…catch` block to handle synchronous errors. For asynchronous code, use the `.catch()` method on promises or the `callback(err,…)` convention for callbacks.
4) Explain the concept of modules in Node.js.
Answer: Modules are reusable code units that can be imported and exported. They allow for modularity and code reuse.
5) Describe the different ways to read from and write to files in Node.js.
Answer: Use `fs.readFile()` and `fs.writeFile()` for synchronous operations, or `fs.createReadStream()` and `fs.createWriteStream()` for asynchronous streaming operations.
6) How do you send HTTP requests in Node.js?
Answer: Use the `http` or `https` module to create a request object and specify the request options. Then call the `request.end()` method to send the request.
7) Explain event driven programming in Node.js.
Answer: Event driven programming relies on event listeners to respond to specific events triggered by the system or external sources. Node.js's event emitter API allows objects to listen for and emit events.
8) Describe the different ways to create a web server in Node.js.
Answer: Use the `http` or `https` module to create an instance of the `Server` class. Alternatively, use a framework like Express.js for a more comprehensive web server solution.
9) How do you handle user sessions in Node.js?
Answer: Use middleware like Express session or Passport.js to create and manage user sessions. Store session data in a database, Redis, or in memory.
10) Explain the role of middleware in Node.js.
Answer: Middleware is a type of function that sits between the request and response cycles in a web application. It allows developers to perform common tasks like authentication, authorization, logging, and parsing request data.
11 - Describe the different types of database connections in Node.js.
Answer: Use `mongoose` for MongoDB, `mysql` for MySQL, `pg` for PostgreSQL, or `redis` for Redis. Each library provides a specific set of methods for connecting to and interacting with the database.
12) How do you handle authentication and authorization in Node.js?
Answer: Use Passport.js or other authentication libraries to handle OAuth, JWT, or custom authentication mechanisms. Implement authorization checks using middleware or specific rules based on user roles and permissions.
13) Explain the concept of microservices in Node.js.
Answer: Microservices architecture divides an application into smaller, independent services that communicate through lightweight protocols like HTTP or gRPC. Node.js is suitable for building microservices due to its lightweight and event driven nature.
14) Describe the different deployment options for Node.js applications.
Answer: Deploy Node.js applications to platforms like Heroku, AWS Elastic Beanstalk, DigitalOcean App Platform, or self host them on virtual machines or containers using Docker or Kubernetes.
15) Explain the importance of testing in Node.js.
Answer: Testing ensures the reliability and correctness of Node.js applications. Use testing frameworks like Mocha, Chai, and Sinon to write unit tests, integration tests, and API tests.
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- Course Overview
- This course covers essential Node.js interview questions to prepare candidates for technical interviews at Cognizant. It delves into key concepts of Node.js, including its event-driven architecture, asynchronous programming, and object-oriented features. The course also explores various aspects of Node.js, such as file handling, networking, and error handling, providing in-depth knowledge and practical examples to enhance candidates' preparation for successful interviews.
- Course Description
- This comprehensive course prepares you for interviews at Cognizant by covering essential Node.js concepts, commonly asked questions, and practice problems. Improve your technical skills, master interview techniques, and increase your chances of success in landing your desired role.
- 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: Runtime environment based on the Chrome V8 JavaScript engine, enabling the creation of server side applications.
2) Express.js: Web framework for building web applications and APIs using Node.js, offering features such as routing, middleware, and template engines.
3) MongoDB: Document oriented database management system, providing flexible schema design, high scalability, and fast querying capabilities.
4) Mocha: JavaScript testing framework that enables writing, running, and debugging unit tests for Node.js applications.
5) Chai: JavaScript assertion library that provides a simple and expressive API for writing clear and maintainable test assertions.
6) Supertest: HTTP request testing framework for Node.js, allowing for easy testing of HTTP servers and APIs.
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