Mastering Express Framework

What is the purpose of middleware in Express?

• To store data in a database

• To serve static files only

• To handle only GET requests

• The purpose of middleware in Express is to process requests and responses, enabling functionalities like logging, authentication, and error handling.

Which method is used to define a route in Express?

• app.listen()

• app.route()

• app.configure()

• app.get(), app.post(), app.put(), app.delete()

How can you handle errors in Express applications?

• Log errors to the console only

• Ignore errors and continue execution

• Use error-handling middleware and try-catch blocks in async route handlers.

• Use synchronous route handlers exclusively

What is a REST API?

• A REST API is an interface that allows communication between applications using HTTP requests to access and manipulate resources.

• A REST API is a programming language for web development.

• A REST API is a graphical user interface for applications.

• A REST API is a type of database management system.

Which middleware is commonly used for session management in Express?

• cookie-parser

• passport

• body-parser

• express-session

How do you serve static files in an Express application?

• Set 'app.static('path/to/static/files');' to serve static files.

• Use 'app.use(express.static("path/to/static/files"));' to serve static files.

• Use 'app.serveStatic('path/to/static/files');' to serve static files.

• Use 'app.get('/static', (req, res) => res.sendFile('path/to/static/files'));' to serve static files.

What is the order of middleware execution in Express?

• The order of middleware execution in Express is sequential, based on the order they are defined.

• Middleware execution is random and unpredictable.

• Middleware execution occurs in reverse order of definition.

• All middleware must be defined before any routes.

How can you access route parameters in Express?

• Access route parameters with 'req.query' in Express.

• Use 'req.route' to get route parameters in Express.

• Use 'req.body' to access route parameters in Express.

• Use 'req.params' to access route parameters in Express.

What is the role of the 'next' function in middleware?

• The 'next' function allows middleware to pass control to the next middleware function.

• The 'next' function terminates the middleware process.

• The 'next' function sends a response to the client.

• The 'next' function is used to log requests only.

How do you define a catch-all route in Express?

• app.get('/api/*', (req, res) => { res.send('API route'); });

• app.use('*', (req, res) => { res.send('Middleware route'); });

• app.get('/home', (req, res) => { res.send('Home route'); });

• app.get('*', (req, res) => { res.send('Catch-all route'); });