Local script to web page integrated command prompt?

Hey ! I'm on a personal project and I'm kinda stuck...

What it's suppose to do:

• Launch a local .js script from a web page
• Redirect everything to an integrated command prompt

I've already find some interesting thing for the integrated command prompt like termlib.js and Xterm.js but I'm not able to find anywhere on the internet something about redirecting the echo of a process to a webpage...

Does anyone have any idea ? Is this even possible ? (I really hope so)

If I'm not clear somewhere, I will be pleased to explain you and correct my publication as fast as possible! If I can improve this question, don't hesitate to tell me ! Thanks for reading !