fornmdata.js

    $(document).on('submit','#nombre_form',function(event){
        event.preventDefault();
          $.ajax({
           url:"url",
           method:"POST",
           data:new FormData(this),
           dataType:'JSON',
           contentType: false,
           cache: false,
           processData: false,
           success:function(data){
             
           }
          });
      });