Understanding Express.js

What does middleware in Express.js mainly do?

• It handles routing.

• It performs tasks like logging and parsing requests.

• It connects to the database.

• It manages server configuration.

How can middleware be used in Express.js?

• By calling app.use() with a function that takes request, response, and next as arguments.

• By using app.get() with a function that takes request, response, and next as arguments.

• By defining middleware within the package.json file.

• By including middleware directly in the HTML file.

Which type of middleware is provided by Express.js and used for parsing JSON request bodies?

• Application-Level Middleware

• Router-Level Middleware

• Built-in Middleware

• Third-Party Middleware

What type of middleware would you use to handle cross-origin requests in an Express.js app?

• Application-Level Middleware

• Error-Handling Middleware

• Built-in Middleware

• Third-Party Middleware

What are the common HTTP methods used in RESTful APIs with Express.js?

• UPDATE

• GET, POST, PUT, DELETE

• FETCH

• PATCH

What is Express.js?

• A JavaScript runtime environment
• A front-end framework
• A back-end web application framework
• A package manager for Node.js

Explain the concept of request and response objects in Express.js.

• Request and response objects in Express.js are not related to handling HTTP requests

• Request and response objects in Express.js are used for database operations

• Request and response objects in Express.js are essential for handling incoming HTTP requests and sending appropriate responses back to the client.

• Request and response objects in Express.js are only necessary for static file serving

Which HTTP request method is used to create a new resource in RESTful API using Express.js?Where would you define middleware that should only apply to specific routes in an Express.js application?

• Application-Level Middleware

• Router-Level Middleware

• Error-Handling Middleware

• Built-in Middleware

In Express.js, what does the `app.use()` method do?

• Create a new route
• Define a route handler
• Mount a middleware function
• Send a response to the client

What is the purpose of the 'req' and 'res' parameters in Express.js route handlers?

• To store user credentials
• To define route parameters
• To access the request and response objects
• To manage database connections