Express

Question 1

How do you add express to your package dependencies?

Answer 1

npm install express

npm i express

Question 2

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

Answer 2

app.listen( );

Question 3

How do you mount a middleware with an Express application?

Answer 3

with the 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

request and response objects

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 a request as JSON and passes along the req.body property to other middleware.

Necessary when our parser will receive JSON request bodies

Question 7

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

Answer 7

Semantics or just for expressing intent

Could assign any functionality to any HTTP method if one wanted to

Question 8

What does express.static( ) return?

Answer 8

A function

Question 9

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

Answer 9

It contains a string representation of the current directory

Question 10

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

Answer 10

It takes all arguments and combines them into a single file/directory path as a string