[lairdwell]

What's the most versatile and well supported back-end language? Is using one and a different one for front end better than say using JS for full stack?

[garty1]

There are no best language. It would be more about you need, that will result in the best language for your need.
But if you really need a answer, C#, NodeJS, Python are all really nice. Actually there are probably the most common in the industry for back-end.

Please note too, when you work for someone, you don't always choose you language, you usually just deal with it.

[lacking]

Indeed there is no best answer, considering the fact that the choice depends mainly on your application and needs. The thing is you can even write your back-end in C++ with say the Qt framework for instance. You would have total control over how your back-end reacts to the client side and you can make your code really efficient. But do you really want to reinvent the wheel ?

The question you should ask would be: will the back-end coded in my favorite (where you feel most at ease) language fulfill my (client's) need ?

[raykap2]

you really have to go with the situation and kind of data you are going to put in it. your question is too generic

[Leonidas300]

Maybe check Python frameworks like Django or Flask

[Sexbomb_101]

I reckon it's worth taking a look into PHP and MySQL

[coolkidattheparty]

I agree that it really depends on your needs.

[weofihwofiwbr]

MERN stack using NodeJS for back end