If “build the server and client in the same language” is a hard requirement, I believe your only choice is JavaScript…
The tone of the post makes me think you’re newer to programming, so I’ll leave it at that, as extensions to this question can overwhelm quickly, but yeah, JavaScript is a fine language for what you’re doing
No disrespect to either artist, but I always find it funny whenever this meme-format is aimed at anyone other than the king of “YEAH!”'s…
Rob Zombie
SO FAR AWAY