test.blade.php

<script type="text/javascript">
$.ajaxSetup({
    headers: {
        'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
    }
});

$('form').on('submit',function(e){
    e.preventDefault();
    $.ajax({
        type:'POST',
        url:'', // endpoint {{ route('test') }}
        headers: {
            'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
        },
        data: {
         // data key valular
       },
       success:function(data){
          alert(data.success);
       }
    });
});