How to get a list of called functions?

Question

JavaScript

There is a site that displays some data. And this site has a hidden API that allows you to get this data,
I don’t know where to start, please tell me)

Answer 1

Since you have javascript in the tags, then the correct answer is to read the code. There is nothing hidden in the world of js - everything is explicitly * given to the client.
* There is, of course, obfuscation, but there are many deobfuscators for this. The best obfuscator is a programmer who came up with an "unusual" architecture.

Answer 2

Console and Profiler in the same firefox devtools or in chrome
Firefox
Chrome

Answer 3

start from the network tab in chrome dev tool, see where the requests go from and what comes from the server,