There are many programmers working today who only know Javascript. I can’t speak to whether that’s the situation with OP or not, but it is common to see tools that I personally would write in Python being written today in JS, even sometimes by experienced polyglot programmers. I don’t know about “most”, but it is quite common. It surprised me a bit too, the first time I encountered it.

I don’t think it has much to do with “liked” or “best tool for the job” as much as it is simply “prevalent” or “popular”.