I don't get output with an AJAX 'POST'

const XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest;

//setup the json object
let jsonQuizData = {
    "nQuestionCount": 10,
    "strQuizName": "Fabricated Test One",
    "nPassingScore": 91,
    "dtmFinished": 1540338527220,
    "nMaxScore": 130,
    "nMinScore": 5,
    "nPtScore": 91,
    "strQuizId": "5sM5YLnnNMN",
    "strStatus": "C",
    "strLearnerName": "Daffy Duck",
    "strLearnerEmail": "daffy@duck.com",
    "aQuestions": [{
            "strDescription": "text of question one",
            "strCorrectResponse": true,
            "strStatus": "C",
            "strUserResponse": true,
            "nWeight": 3,
            "nPoints": 5,
            "nQuestionNumber": 1
        },
        {
            "strDescription": "text of question two",
            "strCorrectResponse": false,
            "strStatus": "C",
            "strUserResponse": true,
            "nWeight": 2,
            "nPoints": 5,
            "nQuestionNumber": 2
        },
        {
            "strDescription": "text of question three",
            "strCorrectResponse": "a",
            "strStatus": "C",
            "strUserResponse": "a",
            "nWeight": 3,
            "nPoints": 5,
            "nQuestionNumber": 3
        },
        {
            "strDescription": "text of question four",
            "strCorrectResponse": "c",
            "strStatus": "C",
            "strUserResponse": "c",
            "nWeight": 3,
            "nPoints": 5,
            "nQuestionNumber": 4
        },
        {
            "strDescription": "text of question five",
            "strCorrectResponse": "a",
            "strStatus": "C",
            "strUserResponse": "a",
            "nWeight": 2,
            "nPoints": 5,
            "nQuestionNumber": 5
        },
        {
            "strDescription": "text of question six",
            "strCorrectResponse": "d",
            "strStatus": "C",
            "strUserResponse": "d",
            "nWeight": 1,
            "nPoints": 5,
            "nQuestionNumber": 6
        },
        {
            "strDescription": "text of question seven",
            "strCorrectResponse": false,
            "strStatus": "C",
            "strUserResponse": false,
            "nWeight": 3,
            "nPoints": 5,
            "nQuestionNumber": 7
        },
        {
            "strDescription": "text of question eight",
            "strCorrectResponse": true,
            "strStatus": "C",
            "strUserResponse": true,
            "nWeight": 3,
            "nPoints": 5,
            "nQuestionNumber": 8
        },
        {
            "strDescription": "text of question nine",
            "strCorrectResponse": false,
            "strStatus": "C",
            "strUserResponse": false,
            "nWeight": 3,
            "nPoints": 5,
            "nQuestionNumber": 9
        },
        {
            "strDescription": "text of question ten",
            "strCorrectResponse": true,
            "strStatus": "C",
            "strUserResponse": true,
            "nWeight": 3,
            "nPoints": 5,
            "nQuestionNumber": 10
        }
    ]
};

//console.log(jsonQuizData);


// Send data to handler
let xhr = new XMLHttpRequest();
let baseURL = 'http://localhost:3000/quiz/';
let endPoint = '5sM5YLnnNMN_1540338527220.json';
xhr.open('POST', baseURL+endPoint, true);
xhr.setRequestHeader("Content-type", "application/json");
xhr.setRequestHeader("cache-control", "no-cache");
xhr.send(JSON.stringify(jsonQuizData));