listen on node js

Question

hi guys .
i have a Q about node js http module and also some server related modules like express & ...
my Q is why we use listen for a port? eventEmitter doesnt make sense for me . can you please give me a good resource for that ?
another question : if i want to get a object in json format from a url , what should i do in express ? for example there is an API called mymemory translation which is free . i want to get the json format and log a property of it . what should i do ? can you explain for me ? thanks all :)

Answer 1

https://www.youtube.com/playlist?list=PL4cUxeGkcC9gcy9lrvMJ75z9maRw4byYp

This playlist is really good, video #8 is about eventEmitters.

Answer 2

fetch()

https://youtu.be/is0QYV0oHx0

Answer 3

Server script is different from desktop application, it always listen to the request of clients, and only execute codes and response data, once receive a request.