Express.js Online Practice Exams

Express.js

Free Mock Test

Questions 27
Maximum mark 61

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Express.js Set 1

Free Mock Test

Questions 15
Maximum mark 15

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Obtaining the Express.js certification validates your skills in building web applications with Node.js and the Express.js framework. This certification demonstrates your ability to work with routing, middleware, template engines, and database integration using Express.js. It makes you a valuable asset in the IT job market, as Express.js is widely used for developing server-side applications.

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Express.js Online Practice Exams FAQs

1. What is Express.js and how does it relate to Node.js?

Express.js is a web application framework for Node.js. It provides a set of tools and features for building web applications and APIs in Node.js. Express.js simplifies common tasks like routing, handling requests and responses, and working with middleware. It is often used in conjunction with Node.js to create server-side applications that handle HTTP requests and manage routes and middleware effectively.

2. What are routes and middleware in Express.js?

In Express.js, routes define the paths that users can access on a web server. Routes are used to map URLs to specific functions that handle requests and generate responses. Middleware, on the other hand, are functions that are executed in the order they are defined in the application's request-response cycle. Middleware can perform tasks like authentication, logging, data parsing, and more. Both routes and middleware play a crucial role in structuring and handling requests in Express.js applications.

3. How do you handle routing in Express.js?

Routing in Express.js involves defining routes using HTTP methods (GET, POST, etc.) and URL patterns. For example, to handle a GET request to the "/products" path, you would define a route using `app.get('/products', handlerFunction)`. The `handlerFunction` is executed when a request to that route is made. Routes can also include route parameters, query parameters, and more complex patterns. Express.js provides a flexible and intuitive way to manage the flow of requests and responses in your application.

4. What is middleware chaining in Express.js?

Middleware chaining in Express.js involves using multiple middleware functions in a specific order to process requests. Middleware functions are executed in the order they are added using the `app.use()` or route-specific methods. This allows you to define a sequence of operations for request processing. Middleware chaining is commonly used for tasks like authentication, data validation, and logging. It provides a modular and organized way to handle different aspects of request processing in your application.

5. How can Express.js be used to create RESTful APIs?

Express.js is well-suited for creating RESTful APIs. You can define routes to handle different HTTP methods (GET, POST, PUT, DELETE) and map them to appropriate functions. For example, to create a route that handles GET requests to retrieve a list of items, you would use `app.get('/items', handlerFunction)`. To create a route for adding a new item, you might use `app.post('/items', handlerFunction)`. By defining these routes and implementing the corresponding logic, you can create a robust API that follows RESTful principles for resource management.