JSFiddle - React, Tailwind, and code Playground

JavaScript

url="ftp://example.com";
protocols = ['http', 'https', 'ftp', 'sftp', 'ssh', 'smtp'];
protocols.forEach(function(item) {
	if(url.indexOf(item) != -1) {
   	newUrl = "http://"+url.substr(url.indexOf("//")+2);
   }    
});

alert(newUrl);