So if the server side stuff was written in node, that is a js framework and still requires a learning curve for developers if they don't already know node. Also

So if the server side stuff was written in node, that is a js framework and still requires a learning curve for developers if they don't already know node. Also you shouldn't choose your server side language/framework based on the fact it's the same as the front-end code. And you still need to have a clear and well documented API for the server side app - just using js isn't going to solve that problem. If you do solve that problem, in any language, then is implementing it in js really a necessity (apart from maybe a skill issue i.e. do you need people with a mix of skills or just js devs but again, I can't see why this is a problem)?