JSFiddle - React, Tailwind, and code Playground

JavaScript

window.onload = function(){
    var url0 = "http://www.google.de?q=jsfiddle&whatever=213";
    var url1 = "http://www.google.de?q=jsfiddlewhatever=213";
    var url2 = "http://www.google.de?q=jsfiddle&whatever213";
    
    //Hit run for demo
    //open Console for output -> FF: Shift + Ctrl + K
    console.log("url 0:");
    console.log(getParams(url0));
    console.log("url 1:");
    console.log(getParams(url1));
    console.log("url 2:");
    console.log(getParams(url2));
    
    //window.location.href to get url of current document... :)
};

function getParams(url){
    var paramsStart = url.indexOf('?');
    var params = null;
    
    //no params available
    if(paramsStart != -1){
        var paramsString = url.substring(url.indexOf('?') + 1, url.length);
        
        //only '?' available
        if(paramsString != ""){
            var paramsPairs = paramsString.split('&');
            
            //preparing
            params = {};
            var empty = true;
            var index  = 0;
            var key = "";
            var val = "";
            
            for(i = 0, len = paramsPairs.length; i < len; i++){
                index = paramsPairs[i].indexOf('=');
                
                //if assignment symbol found
                if(index != -1){
                    key = paramsPairs[i].substring(0, index);
                    val = paramsPairs[i].substring(index + 1, paramsPairs[i].length);
                    
                    if(key != "" && val != ""){
                        
                        //extend here for decoding, integer parsing, whatever...
                        
                        params[key] = val;
                        
                        if(empty){
                            empty = false;
                        }
                    }                    
                }
            }
            
            if(empty){
                params = null;
            }
        }
    }
    
   ...