Which gtag.js event tracking code is correct?

Question

Google Analytics

What is the correct code for tracking the goal-event in Google Analytics for gtag.js?

1. gtag('event', 'Custom event name', { 'event_category': 'bbb', 'event_action': 'aaa' });
or
2. gtag('event', 'aaa', {'event_category': 'bbb'});

Answer 1

Correct as it says in the manual:

gtag('event', <action>, {
  'event_category': <category>,
  'event_label': <label>,
  'value': <value>
});

Accordingly, the name of the action "action" is taken out of the list of parameters.