> Same language on the front and backend. Yes, isomorphic JS. With React it can be annoying if you have a component that you never intended to run on the serv

> Same language on the front and backend. Yes, isomorphic JS. With React it can be annoying if you have a component that you never intended to run on the server and you get a hydration warning. It also complicates the decision of what language to use on the backend. It is often useful though.