Is there a way to get the faved_by_id value of an user through the API ?

It’s that parameter derpibooru uses in the url for favorite pages.

What is your starting point?

The ID for faved_by_id is the user’s ID, same as any other place the user’s ID applies. If you already know their user ID, there is no further work for you to do.

I do not see an endpoint to directly get a user’s ID if you only know their username. You can get a user’s ID by finding any non-anonymous upload, comment, forum post, or gallery, by username - the user ID is part of these responses.

If you know the user has favorites, you can search for faved_by:username instead of faved_by_id:

To find the user ID so that I could get the image IDs from their favorite galleries just from the username.

>you can search for faved_by:username instead of faved_by_id

But you just gave me a better solution. Thanks dude !