Check If Field Already Exists In SharePoint 2013 List Using JSOM

Steps

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

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

var checkFieldExist=checkFieldExists('Documents');
});

function checkFieldExists(listTitle){

     var context = new SP.ClientContext.get_current();
     var web = context.get_web();
     var list = web.get_lists().getByTitle(listTitle);
     var listFields = list.get_fields();
     context.load(listFields);
     context.executeQueryAsync(printFieldNames,onError);

     function printFieldNames() {
     var e = listFields.getEnumerator();
           var fieldExist = false;
              while (e.moveNext()) {
                   var field = e.get_current();
                   if (field.get_title() == "myfieldname") {
                     fieldExist = true;
                }
              }
              return fieldExist;
     }

     function onError(sender,args)
     {   return fieldExist;
        console.log(args.get_message());
     }
  }
</script>

Conclusion

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