How to upload a file from a computer to a folder without php?

Question

JavaScript

I am creating a chrome extension. You need to upload a photo to the right folder, how to do it if there is no php support in the extensions?

Answer 1

And at what here PHP in general???
Here is the function in chrome extentions that is responsible for downloading the file:

chrome.downloads.download({url:url,filename:filename,saveAs: false},function() {
    console.log(chrome.runtime.lastError);
});