Creating a basic Express server - Quick Revision & Summary

Recall & Review

beginner

What is Express in Node.js?

Express is a simple and flexible web framework for Node.js that helps you build web servers and APIs easily.

beginner

Which method creates an Express application?

The method express() creates an Express application instance.

beginner

How do you make an Express server listen on port 3000?

Use app.listen(3000, () => { console.log('Server running on port 3000') }) to start the server on port 3000.

beginner

What does app.get('/', (req, res) => { ... }) do?

It defines a route handler for GET requests to the root URL '/' and sends a response back to the client.

beginner

Why do we use res.send() in Express?

res.send() sends a response back to the client, like text or HTML, to show in the browser.

Which line creates a new Express app?

A const app = express();

B const app = new Express();

C const app = require('express');

D const app = express.createApp();

The correct way to create an Express app is by calling express() as a function.

How do you define a route for GET requests to '/'?

A app.post('/', (req, res) => { ... });

B app.listen('/', () => { ... });

C app.route('/', 'GET', () => { ... });

D app.get('/', (req, res) => { ... });

app.get() defines a handler for GET requests to the specified path.

What does app.listen(3000) do?

A Sends a response to port 3000

B Stops the server on port 3000

C Starts the server on port 3000

D Creates a new route on port 3000

app.listen(3000) starts the server and listens for requests on port 3000.

Which object represents the incoming request in a route handler?

A req

B res

C app

D server

The 'req' object holds information about the incoming request.

Which method sends a response back to the client?

A server.send()

B res.send()

C app.send()

D req.send()

res.send() is used to send a response to the client.

Explain how to create a basic Express server that responds with 'Hello World' on the root URL.

Think about the steps from importing Express to starting the server.

Describe the roles of the 'req' and 'res' objects in an Express route handler.

One is for input, the other for output.