Is it possible to send custom events to GA4?

Question

Looks like GA4 requires you to pre-define the customized strings in the admin console before being able to send them.

But sometimes I want to track very trivia and minor content on the pages.

There could be a lot of strings to send. In GA UA it's quite simple, just something like:

ga('pageview', 'page'+string);

But in GA4, how can I do that? Is the feature removed?

Answer 1

Looks like there is a misunderstand about the event parameter

You can create a dimension AKA event parameter in admin -> custom definition

It is kind of a slot. Then you can send any value related the slot with only one configuration. No need to create as mush slot as you sent the value

event : "page_view",
page_custom_type : "some string 1"

event : "page_view",
page_custom_type : "some string 2"