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

app.listen( ) method

Question 3

How do you mount a middleware with an Express application?

Answer 3

app.use( ) method

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

Answer 6

It parses incoming requests with JSON payloads and is based on body-parser; used when json request are sent to the server

Question 7

What does express.static() return?

Answer 7

returns a middleware function

Question 8

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

Answer 8

the directory name of the current module; absolute file path

Question 9

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

Answer 9

joins all given path segments together