Unreal.js is a plug-in which brings V8-powered Javascript into UnrealEngine4. (Apache2)

Features

• Powered by latest V8 (ES6)
• CommonJS modules
• Full access to the whole UnrealEngine API
• Free to subclass existing classes including blueprint
• Web-dev like UMG (Jade, pseudo-css, pseudo-angular.js)
• Live reload
• Communicate with outer world: REST, process(pipe), arraybuffer, ...
• Bridge API for editor extension
• Auto-completion for Visual Studio (auto-generated *.d.ts)

• Dedicated Javascript console on UnrealEditor

https://github.com/ncsoft/Unreal.js

So this plugin allows you to make games on Unreal Engine 4 with Java?

If you can do with Blueprint visual scripting language, you can do the almost same job with JavaScript.

Looks awesome! How does the JS to UE API calling work? Would it be possible to create editor plugins using this or modify it to do so?