I'm trying to "poison" a filename in a file-upload application to make sure my server side validation is upheld. My understanding is that JavaScript runs in the browser and that everything eventually boils down to JavaScript. In DevTools, how am I supposed to mock this if I can't find the JavaScript that "relates" to my C#? I feel like I should be able to see JavaScript code that somewhat resembles what I have in C#, but I'm not really seeing anything.
EDIT: Anyone want to explain why this was downvoted or are you guys just going to hide behind the curtains?