JSFiddle - React, Tailwind, and code Playground

HTML

<a download='OriginalFileName' id="file" href="data:application/octet-stream;charset=utf-8;base64,Zm9vIGJhcg==">text file</a>

JavaScript

var fileName = prompt("Please name your file", "OriginalFileName"),
fileLink = document.getElementById('file');
if(fileName!= null){
  fileLink.download = fileName;
  fileLink.innerHTML = fileName;
}