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() method

Question 3

How do you mount a middleware with an Express application?

Answer 3

Use the ‘.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

the Request ‘req’ and Response ‘res’ 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 is the significance of an HTTP request’s method?

Answer 6

We can use routing to specify how the application responds to a specific request method???

Question 7

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

Answer 7

Returns a middleware that parses incoming requests with JSON payload. It creates a new ‘body’ object containing the parsed data on the request object (req.body).

any request that has json in the body?

Question 8

What does ‘express.static()’ return?

Answer 8

a middleware that serves static files / determines how a file should be treated.

Question 9

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

Answer 9

The directory name of the current module; absolute file path; starts with root of file path and directory name of file

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 normalizes the resulting path.

Joins path segments and returns a string; joins them using host separating system