Have frontend javascript access text file that is private to users

I'm having trouble putting into words what I want, but I'll try to explain better. What I want to do is have the javascript (or another solution, if there is one) be able to access a text file on a static site and use data from the text file (in whatever way). The catch is I don't want users browsing to the website to be able to access the text file itself, but only be able to see the output of however I use the file and display results. Is there a way to do this?