I'm actually quite familiar with JS and comfortable with writing callbacks on the client. It's very different from doing server and backend code. On the client

I'm actually quite familiar with JS and comfortable with writing callbacks on the client. It's very different from doing server and backend code. On the client, you don't make too many calls to the server, and if you do, I'd consider that you're doing something wrong. What I mean is, on the client side, if you need to make 10 calls to the server before you can display something, you're obviously doing it wrong. So you can avoid a callback mess by simply making sane design decisions. But on the server side, you have to make several calls to the DB, and thus, the callback hell is unavoidable.