Express

Question 1

How do you add express to your package dependencies?

Answer 1

npm init –yes (for package.json)
npm install express

Question 2

What Express application method starts the server and binds it to a network PORT?

Answer 2

app.listen(3000, () => {

console.log(‘Express server listening on port 3000’);
});

Question 3

How do you mount a middleware with an Express application?

Answer 3

app.use(‘/user/:id’, (req, res, next) => {
console.log(‘Request Type:’, req.method)
next()
})

This example shows a middleware function mounted on the /user/:id path.

Question 4

Which objects does an Express application pass to your middleware to manage the request/response lifecycle of the server?

Answer 4

req / res

Question 5

What is the appropriate Content-Type header for HTTP messages that contain JSON in their bodies?

Answer 5

application/json;

Question 6

What is the significance of an HTTP request’s method?

Answer 6

indicate the desired action to be performed for a given resource

(telling the server what you want to do)

Question 7

What does express.static() return?

Answer 7

returns middleware handled by specified directory

Question 8

What is the local __dirname variable in a Node.js module?

Answer 8

same exact thing as path.dirname(__filename)

The directory name of the current module.

Question 9

What does the join() method of Node’s path module do?

Answer 9

The path.join() method joins all given path segments together