The first row becomes the keys and every row after it becomes an object. Quoted commas and line breaks inside a field are handled properly.
This page loads no libraries at all — the work is done by the browser itself. Your file is read on your own machine and never sent anywhere — open your browser's network tab and watch while you use it.
Yes — it supplies the key names.
No. Everything stays a string, because guessing turns product codes into numbers and loses leading zeros.
Everything here is free and works the same way — in your browser.