Express

Question 1

How do you add express to your package dependencies?

Answer 1

Npm innit -yes then npm install express

Question 2

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

Answer 2

Listen method
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

Pass it a callback function that has parameters response and next. Call use to install middleware

Question 4

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

Answer 4

Req (request) and res (response) and next

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

Question 7

What does the express.json() middleware do and when would you need it?

Answer 7

Method to recognize the incoming Request Object as a JSON Object

Question 8

What does express.static() return?

Answer 8

Returns a middleware that serves static files

Question 9

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

Answer 9

directory name of the current module

Question 10

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

Answer 10

joins the specified path segments into one path