500 Internal Server Error Ajax Laravel

I'm trying to make a POST to

http://localhost:8888/test

---

JS

$('.saveBTN').click(function (event) {

    $( "form#editForm" ).on( "submit", function( event ) {
      event.preventDefault();

      var inputs = {};
      $("#editForm :input").each(function() {
        inputs[$(this).attr("name")] = $(this).val();
      });

      var $inputs = JSON.stringify(inputs);

      $.ajax({
          headers: {'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')},
          url: '/test',
          type: 'POST',
          dataType: 'json',
          data: $inputs,
          success: function (data, textStatus, xhr) {

              console.log(data);
          },
          error: function (xhr, textStatus, errorThrown) {

              console.log('PUT error.');
          }
      });

});

---

I keep getting

500 Internal Server Error

I've tried added

<meta name="csrf-token" value="{{ csrf_token() }}">

and this on my Ajax

headers: {'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')},

Any hints on this will be much appreciated !

via Chebli Mohamed