Express

Question 1

How do you add express to your package dependencies?

Answer 1

npm install express

Question 2

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

Answer 2

listen()

Question 3

How do you mount a middleware with an Express application?

Answer 3

app.use(callback)

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), res (response), 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

It signals the intent of how an HTTP request should be routed. GET requests can have one handler function, while DELETE requests have a different one.

Question 7

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

Answer 7

It parses incoming requests with JSON payloads. Needed when sending json data to the server.

Question 8

What does express.static() return?

Answer 8

function serveStatic

Question 9

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

Answer 9

The directory name of the current module

Question 10

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

Answer 10

joins all given path segments together using the platform-specific separator as a delimiter, then normalized the resulting path