var express = require('express');
var bodyParser = require('body-parser');

var app = express();
app.use(bodyParser.json());

app.post('/acceptContacts', function(req, res) {
    'use strict';
    console.log(req.body);
    console.log(req.body.hello);
    res.send(200);
});

app.listen(8080);

var req = new XMLHttpRequest();
req.open('POST', 'http://localhost:8080/acceptContacts?Content-Type=application/octet-stream');
var obj = {hello:'world'};
req.send(JSON.stringify(obj))

{}
undefined