Game with own API for developers

Development Modding
1

Hi,

I want to ask you if it is possible to make game where would be implemented some language interpreter (like Lua or JavaScript) and ppl could make his own scripts and run on own hosted servers (like Minecraft or CS:GO)?

2

yes JS is going:

Unreal Marketplace: Unreal.js in Code Plugins - UE Marketplace

GitHub: GitHub - ncsoft/Unreal.js: Unreal.js: Javascript runtime built for UnrealEngine

3

It is possible but you have a lot of work ahead of you if you want to create nice javascript-based modding. Just installing unreal.js is not going to get you far.