JSFiddle - React, Tailwind, and code Playground

HTML

<div class="row">
  <input type="checkbox" name = "name1" value=1 />
  <input type="checkbox" name = "name2" value=2 />
  <input type="checkbox" name = "name3" value=3 />
  <input type="checkbox" name = "name4" value=4 />
  <input type="checkbox" name = "name5" value=5 />
</div>

JavaScript

$(".row :checkbox").click(function(){
    var check = $(".row :checkbox");
    var url = "";
    check.each(function(i){
        if($(this).is(":checked")){
             var name = $(this).attr("name");
             var value = $(this).attr("value");
          url = url+  name + "=" + value + "&";
         
        }
        
    
    })
     //На всякий случай сделаем проверку на последний символ, хотя можно и без IF, просто url = ..
     var lastSim = url.slice(-1);
     if(lastSim == "&"){
             url = url.substring(0, url.length - 1);
     }
    alert(url)

})