There are people with all kinds of experience level, someone would definitely find it useful.

I did build a complete web app (basically a Reddit clone) in NodeJs from scratch recently (though Angular2 instead of React), most of the things that you described in your book's contents were in the official documentation or tutorials (and Stack overflow).

Still, I don't know things like server-side rendering, and although I was able to configure SystemJs I have no idea how to configure it (or its de/merits over bable/webpack), 3rd party authentication (Google/FB login) was a pain, and now I realize I should have used the Flux architecture and also used TDD. But then all this is just a google search away anyway.

However, I would have paid for the book you describe if a) I wasn't broke, b) was just beginning with web dev, c) the book built a complete nontrivial app (something like the Meteor/Telescope).

PS: Which nodeJs framework would you suggest/use?