JSFiddle - React, Tailwind, and code Playground
JavaScript
var yourUrl= "http://www.mydomain.com/folder/mypage.php?param=value";
alert(yourUrl.substring(0, yourUrl.indexOf('?')))
var yourUrl= "http://www.mydomain.com/folder/mypage.php?param=value";
alert(yourUrl.substring(0, yourUrl.indexOf('?')))