Unreal Engine VaREST and DBJson - Simple Setup 

I haven't seen a 5.2 update and beyond. I thought there was some fork or something of it but, we have decided to stick with 5.1.1 for the time being. As far as the other side and handling requests, I might be able to do some kind of an API walkthrough perhaps. I basically have a nodejs REST api that accepts POST requests to an endpoint which has the json as the request body. And I just handle it that way. The API handles all the database things. Might be able to do something if I can find the time though.

I see a linux version for 5.2 that someone got to work. Still waiting on the developer to do their own update. Give them time, it just came out :)