Check If Sharepoint List Already Exists In A Site Using JSOM

Steps

1. Open your Notepad.
2. Copy the code given below and paste it.
3. Name it spvalidation.js.
4. Add Content Editor Webpart in your page.
5. Add saved.js file into your Webpart properties.

<script>
$(document).ready(function()
{

ChecListalreadyexists('Documents');
});
function ChecListalreadyexists(listTitle)
{
   var context = SP.ClientContext.get_current();
   var web = context.get_web();
   var site = context.get_site();
   var rootWeb = site.get_rootWeb();
   var subWebs = rootWeb.get_webs();

   context.load(subWebs, 'Include(Title,Lists)');
   context.executeQueryAsync(
    function () {
         for (var i = 0; i < subWebs.get_count(); i++) {
            var subWeb = subWebs.itemAt(i);
            var lists = subWeb.get_lists();
            if(get_listExists(lists,listTitle)) { //Lists property is initialized
               console.log(subWeb.get_title());
            }
         }
    },
    function (sender, args) {
       console.log(args.get_message());
    }
   );
}



function get_listExists(lists,listTitle)
{
    var listExists = false;
    var le = lists.getEnumerator();
    while (le.moveNext()) {
         var list = le.get_current();
            if(list.get_title() == listTitle) {
              listExists = true;
              break;
         }
    }
    return listExists;
}

</script>

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