Express-lvl1

What is Express.js?

• A database

• A frontend JavaScript library

• A Node.js web application framework

• A transpiler for JavaScript

Which method is used to create an instance of an Express application?

• Express.create()

• Express.app()

• Express.new()

• Express()

How do you send a status code of 404 and a message "Not Found" as the response using Express?

• res.status(404).send('Not Found')

• res.send(404, 'Not Found')

• res.set('404').message('Not Found')

• res.error(404).output('Not Found')

Which method is used to specify a callback function for a GET request to a specific route?

• app.get()

• app.request()

• app.receive()

• app.fetch()

Answer explanation

Where do you typically find the data submitted through an HTTP POST request in an Express app?

• req.body

• req.data

• req.params

• req.query

Which Express middleware is commonly used to parse the body of incoming requests?

• body-parser

• request-parser

• http-parser

• data-parser

How can you capture values in the URL using Express routing?

• /:valueName

• /{valueName}

• @valueName

• #valueName

What does app.listen(3000) do in an Express app?

• It makes the app listen on port 3000

• It listens to changes in your code.

• It imports required dependencies.

• It starts the database connection.

To send a file as the response in Express, which method would you use?

• res.send()

• res.sendFile()

• res.download()

• res.output()

What will app.get('/', (req, res) => res.send('Hello World!')); do in an Express application?

• Display 'Hello World!' when accessing any URL

• Save 'Hello World!' to a database

• Send 'Hello World!' as an email

• Display 'Hello World!' when accessing the root URL '/'