如何在Node.js中使用没有回调的jquery ajax请求？

Question

I have been passing lots of time to understand the reason Why my Node.js service is working very well by using postman. If you look below you can see my node.js service is working perfect. But JQUERY code (calling GetAllNotifyTypesFunc();)

Gives me error: (how to call correct both postman and jquery without callbacks?)

Node.js :

'use strict';
var express = require("express");
var app = express();
var MongoClient = require('mongodb').MongoClient;
var router = express.Router();

app.get('/Notifies', function (req, res) {
    MongoClient.connect('mongodb://127.0.0.1:27017/Test', function (err, db) {
        if (err) throw err;
        var coll = db.collection('Notifies');
        coll.find({}).toArray(function (err, result) {
            if (err) {
                res.send(err);
            } else {

                // res.writeHead(200, {
                //   'Content-Type': 'application/json'
                //    });
                // res.end('callback(\'' + JSON.stringify(result) + '\')');
                res.writeHead(200, {
                    'Content-Type': 'application/json'
                });
                res.end(JSON.stringify(result));
                // res.json(result);
            }
        })
    })
});

var port = Number(process.env.PORT || 5000);
app.listen(port, function () {
    console.log("Listening on " + port);
})

if I use Postman:

    $(function () {

    GetAllNotifyTypesFunc();

});

var GetAllNotifyTypesFunc = function () {
    console.log("notify");

    $.ajax({
        url: 'http://127.0.0.1:5000/Notifies',
        dataType: "jsonp",
        async: false,
        //jsonpCallback: "callback",
        cache: false,
        timeout: 5000,
        success: function (data) {
            console.log(data);
            console.log(JSON.parse(data));
        },
        error: function (jqXHR, textStatus, errorThrown) {
            alert('error ' + textStatus + " " + errorThrown);
        }
    });


}

Answer 1

You say jquery that response will be jsonp but it is json. You need to check the difference, i suppose that you should use:

dataType: "json",

jsonp is fo executable functions, see ( What are the differences between JSON and JSONP? )