JSFiddle - React, Tailwind, and code Playground

JavaScript

var s = '/Controller/Action';
var n = s.indexOf('?');
 s = s.substring(0, n != -1 ? n : s.length);
 document.write(s);

document.write('<br>');

var s = '/Controller/Action?asd/asdad';
 var n = s.indexOf('?');
  s = s.substring(0, n != -1 ? n : s.length);
  document.write(s);