How to save a var to the local computer?

Question

I have difficulties with saving a var from javascript to a local file, so I want to write it into an existing file. I can do it with creating and downloading a file but I need it without the browser asking if and where to store the file/var. Is there any way of doing it? Need it because I want to automatically save the var so that my main program (runs locally) can get it. I scrolled through many sites but I couldn't find anything that fit my needs so I unfortunately don't have any code.

Thanks Akira

Answer 1

If the main programm is running you can have the webpage talk to it via http, websockets or webrtc to localhost.