$.ajax({
            type: 'post',
            url: '/editItem',
            data: {
                '_token': $('input[name=_token]').val(),
                'id': $("#empid").val(),
                'name': $('#name').val()
            },
            success: function(data) {
               //code
            }
        });

controller

public function reitem(Request $req) {
    $data = Data::all ();
    return view ( 'welcome' )->withData ( $data );
}

try:

success : function (data) { console.log(data); }

and in blade: @{{ data.id }} or any other field in your DATA::all(); model

/// you may also try