Как правильно сделать пост запрос json?

// BASE SETUP
// =============================================================================
 
// call the packages we need
var express    = require('express');
var bodyParser = require('body-parser');
var app        = express();
var morgan     = require('morgan');
 
// configure app
app.use(morgan('dev')); // log requests to the console
 
// configure body parser
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
 
var port     = process.env.PORT || 80; // set our port
 
var mongoose   = require('mongoose');
mongoose.connect('mongodb://admin@192.168.0.206:27017/monitor'); // connect to our database
var Device     = require('./models/device');
 
// ROUTES FOR OUR API
// =============================================================================
 
// create our router
var router = express.Router();
 
// middleware to use for all requests
router.use(function(req, res, next) {
  // do logging
  console.log('Something is happening.');
  next();
});
 
// test route to make sure everything is working (accessed at GET [url]http://localhost:8080/api[/url])
router.get('/', function(req, res) {
  res.render({ message: 'hooray! welcome to our api!' });   
});
 
// ----------------------------------------------------
router.route('/devices')
 
 
  .post(function(req, res) {
    
    var device = new Device();
    device.uuid = req.body.uuid;
    device.location.coordinates = req.body.location.coordinates;
    device.location.type = req.body.location.type;
 
    device.save(function(err) {
      if (err)
        res.send(err);
 
      res.json({ message: 'Device created!' });
    });
 
    
  })
 
  .get(function(req, res) {
    Device.find(function(err, devices) {
      if (err)
        res.send(err);
 
      res.json(devices);
    });
  });
 
router.route('/devices/:device_id')
 
  .get(function(req, res) {
    Device.findById(req.params.device_id, function(err, device) {
      if (err)
        res.send(err);
      res.json(device);
    });
  })
 
  .put(function(req, res) {
    Device.findById(req.params.device_id, function(err, device) {
 
      if (err)
        res.send(err);
 
      device.uuid = req.body.uuid;
      device.save(function(err) {
        if (err)
          res.send(err);
 
        res.json({ message: 'Device updated!' });
      });
 
    });
  })
 
  .delete(function(req, res) {
    Device.remove({
      _id: req.params.device_id
    }, function(err, device) {
      if (err)
        res.send(err);
 
      res.json({ message: 'Successfully deleted' });
    });
  });
 
 
// REGISTER OUR ROUTES -------------------------------
app.use('/api', router);
 
// START THE SERVER
// =============================================================================
app.listen(port);
console.log('Magic happens on port ' + port);

// app/models/device.js
 
var mongoose     = require('mongoose');
var Schema       = mongoose.Schema;
 
var DevicesSchema   = new Schema({
    uuid: String,
    location : {
    type: { 
      type: String,
      default: 'Point'
    }, 
    coordinates: [Number]
    }
},{
    versionKey: false
});
 
module.exports = mongoose.model('Device', DevicesSchema);