Express Node Js Interview Questions
Interview Questions for Node.js Developers
Express Node Js Interview Questions
Express is a popular Node.js framework for building web applications. It provides a wide range of features for routing, middleware, and view rendering, making it a valuable tool for developers. In interviews, Express.js questions are often asked to assess candidates' understanding of Node.js, web development concepts, and the Express.js framework itself. Candidates may be asked about topics such as routing, middleware, templating, and error handling, as well as their understanding of Express.js's architecture and best practices.
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1 - What is Express.js?
Express.js is a lightweight and flexible Node.js web framework for building efficient and scalable web applications.
2) What are the core features of Express.js?
Routing, templating, middleware, error handling, and static file serving.
3) What is the use of app.get() and app.post() methods?
To define route handlers for HTTP GET and POST requests, respectively.
4) What does res.render() do?
Renders a view (usually an HTML template) to the client.
5) What is middleware?
Reusable functions that can be used to intercept and process incoming HTTP requests.
6) How do you create a middleware in Express.js?
Using the app.use() method.
7) What is the purpose of req.body?
To access the HTTP request body, typically containing form data.
8) How can you validate user input in Express.js?
By using middleware like Express Validator or Joi.
9) What is a cookie in Express.js?
A small piece of data stored on the client's browser that can be accessed and modified by the server.
10) How do you send a cookie to the client?
Using res.cookie().
11 - What are HTTP status codes?
Numeric codes that indicate the status of an HTTP response.
12) How do you handle errors in Express.js?
By using try catch blocks or error handling middleware.
13) What is the role of body parser in Express.js?
It parses incoming HTTP request bodies to convert them into JSON or other formats.
14) What is the difference between app.listen() and app.get()?
app.listen() starts the HTTP server on a specific port, while app.get() defines a handler for HTTP GET requests.
15) How do you create a RESTful API using Express.js?
By following common HTTP methods and designing appropriate routes and handlers for CRUD operations.
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- Course Overview
- This interview preparation course covers comprehensive questions and answers on key concepts in Express.js, a popular Node.js framework. It delves into topics such as routing, middleware, templating, and RESTful APIs, providing practical insights and expert guidance to help you ace your Express.js job interviews.
- Course Description
- Master essential Express.js concepts and prepare for Node.js interview success. Delve into topics ranging from request-response handling and middleware functions to routing and error handling. Gain proficiency in building RESTful APIs and solving common interview challenges related to Express.js and Node.js.
- 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.
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- 4) Detailed Tutorials: Offers extensive tutorials and documentation on tool functionalities and best practices.
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- 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 versatile JavaScript runtime environment server side programming, enabling the construction of scalable, high performance web applications and APIs.
2) Express.js: A popular Node.js framework for building robust web applications quickly and efficiently, providing a wide range of features and middleware for routing,templating, and more.
3) MongoDB: A document oriented NoSQL database that is highly scalable and schemaless, making it ideal for storing and managing large amounts of unstructured data.
4) Mongoose: A MongoDB object modeling tool for Node.js, allowing for easy interaction with MongoDB databases and offering a convenient way to define schemas and validate data.
5) Postman: A powerful API testing and development tool that enables developers to test, debug, and mock APIs, making it essential for troubleshooting and quality assurance.
6) Git: A version control system that allows developers to track changes to their code, enabling collaboration and ensuring a reliable backup of their work.
Traing Program Offering:
Comprehensive coverage of Node.js, Express.js, MongoDB, Mongoose, and Postman.
Hands on exercises and real world project simulations to enhance practical skills.
Guidance from industry experts with extensive experience in building and deploying Node.js applications.
Access to exclusive resources, such as code repositories and online forums for support and collaboration.
Upon completion, students will possess the necessary competencies to confidently pursue Node.js development roles and contribute to cutting edge web application development projects.
- Answer questions accurately and thoroughly. The more helpful and informative your answers are, the more points you'll get.
- Be active on the site.* The more questions you answer, the more points you'll earn.
- Up vote other people's answers.* When you up vote an answer, you're helping to promote it and get it more visibility. This can help other people find the answer they need and can also earn you points.
- Join a team.* Teams are a great way to collaborate with other users and earn points. When you answer questions in a team, you'll earn points for both your team and yourself.
- Refer friends to the site.* When you refer friends to the site, you'll earn points for each friend who signs up and becomes an active user.
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