I want to build a web server with websocket.

I was thinking about controlling Leapmotion using RaspberryPi3, but I learned that Leamotion cannot be connected directly to RaspberryPi3.I recently learned that the only way to connect Leapmotion to a PC and RaspberryPi3 on WebServer is to retrieve Leapmotion data from that PC, but I don't know how to launch JavaScript at all.It may be a simple place, but please let me know.