Learn api

Question

Can you help me to make easier to lern how to api works and implement it?
What sould i learn first

Answer 1

it's simple
a server writen in any server side language will listen to any request
from anywhere and returns data.

you can code your server in any programing language.

you can make requests from client side using ajax or the server it self.

in javascript you can use nodejs to code a server, using express library will done some work for you.

so .. you should learn expressJS
to start making your own api using javascript.

edit: https://expressjs.com/