Ton of stuff online. But depending on where you are in your learning path, it's hard to shuffle through it all.
I've had several friends/colleagues go through a coding bootcamp. Make sure to do research and focus on outcomes-focused programs. Seeing you are wanting to learn JavaScript, Couple of the top programs I know are MakerSquare (Austin, SF, LA, and NYC) and Hack Reactor (SF). Your investment will be worth it -- however, only invest if you are serious about a career as a Software Engineer.