I would think the basics of HTML resources is a minimal bar for calling yourself a "developer" (at that stage you're still a student or an apprentice)

Unfortunately it's a pretty common issue in react forums. There was a discussion recently about there being no way to create s3 upload urls in react. I mean of there are several npm modules, but non have react hooks so nothing was viewed as usable.

You can call yourself whatever you can get away with. There are a whole lot of people out there that have never slung anything but React-flavored JS being called developers and being paid to do it. The industry needs these technicians too, I guess.