To see what will drupalSettings output you can put console log in drupalSettingsLoader.js  and this will give you info what is present in drupalSettings vars that is drupal pushing to JS 

Postman when used as desktop doesnt have browser plugin to add xdebug info to request, but solution is easy, just do this.
Add `XDEBUG_SESSION_START=PHPSTORM` to the query string and PHPStorm will catch the debug session as it would if you were using a browser extension.

Disabling caching on JSON API endpoints doesnt seem possible with using just below in your sevices file

If you are using VS Code and xdebug you might encounter situation where you dont see all the array entries and drupal has huge arrays, reason for this is xdebug setting and its default, to fix this you need to make script for xdebug like this with  "max_children": 999,

You may want to xdebug site on remote server, maybe you dont even want to run site locally but just have remote server running the site and codebase to all be there. You could have development server running on some hosting. To do that first you need to