// Client side js

        $.ajax({
	        type: "POST",
	        url: "rsvp",
	        data: {name: name, email: email},
	        dataType: "json",
            cache:false,
	        success: function(data) {
                alert('sick');//.log(data);
                console.log(data);
	        },
	        error: function(xhr, textStatus, err){
	        	alert('err');
                //console.log(error);
	        }
        });



// server side js with express.

app.post('/rsvp', function(req, res) {
    var payload;
    payload = {status:0, msg: 'you already rsvpd.'};
    res.json(payload);
  });