Retrieving data from MongoDB using Mongoose not working

I have a simple NodeJS, Express, Mongoose app to save and retrieve data from MongoDB based on an online tutorial. Problem I am facing is that whenever I try to retrieve any saved record, I only get _id and __v as shown below...all other movie fields are not displayed. Below is the code I am using to save / retrieve data to/from MongoDB can someone please help by tellin me what I am doing wrong here and how to fix it? Thanks

{
    "_id": "542819b25550346209c85272",
    "__v": 0
}

app.js:

var express = require('express');
var bodyParser = require('body-parser');
var mongoose = require('mongoose');
var movies = require('./routes/movies');
var app = express();
var dbName = 'movieDB';
var connectionString = 'mongodb://localhost:27017/' + dbName;

mongoose.connect(connectionString);

app.use(bodyParser.json());
app.use(bodyParser.urlencoded());
app.use('/api', movies);
 
module.exports = app;

movie.js

var mongoose=require('mongoose');
var Schema=mongoose.Schema;
var movieSchema = new Schema({
  title: String,
  releaseYear: String,
  director: String,
  genre: String
});
module.exports = mongoose.model('Movie', movieSchema);

movies.js

var Movie = require('../models/movie');
var express = require('express');
var router = express.Router();

router.route('/movies').get(function(req, res) {
  Movie.find(function(err, movies) {
    if (err) {
      return res.send(err);
    }
    res.json(movies);
  });
});
router.route('/movies').post(function(req, res) {
  var movie = new Movie(req.body); 
  movie.save(function(err) {
    if (err) {
      return res.send(err);
    }
    res.send({ message: 'Movie Added' });
  });
});
module.exports = router;

I have tested saving to the DB using Chrome Postman where I have sent the following data as POST > ROW in JSON format to /api/movies:

 {"title":"Matrix Reloaded 2", "releaseYear": "2015", "director": "Mike", "genre": "Action"}