Multiplatform online multiplayer

Hello. I’m planning to make a multiplatform MMORPG, and I can’t find anything about multiplayer servers for any platform on Youtube, besides Steam Multiplayer which doesn’t sound that good.

What’s the usual way of making this kind of stuff? I was thinking about making a socket server with NodeJS so I’m able to store player data on MongoDB or something.

Thanks

Thats a cool idea.

Regards,
Tracey
talktowendys