express-post-json

Question 1

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

Answer 1

it recognizes the incoming request object as a JSON object then attaches it to req.body
you would need it when the client makes a post/put because in both these requests the user is sending data (in the form of some data object) to be accepted or stored by the server

Question 2

What is middleware?

Answer 2

middleware is the functions/methods/operations that are called in between a request and a response