server.js

// require express and other modules
const express = require('express');
const app = express();
// Express Body Parser
app.use(express.urlencoded({extended: true}));
app.use(express.json());

var Books = require('./models/books');

// Set Static File Directory
app.use(express.static(__dirname + '/public'));


/************
 * DATABASE *
 ************/

const db = require('./models');

/**********
 * ROUTES *
 **********/

/*
 * HTML Endpoints
 */

app.get('/', function homepage(req, res) {
  res.sendFile(__dirname + '/views/index.html');
});


/*
 * JSON API Endpoints
 */

app.get('/api', (req, res) => {
  // TODO: Document all your api endpoints below as a simple hardcoded JSON object.
  res.json({
    message: 'Welcome to my app api!',
    documentationUrl: '', //leave this also blank for the first exercise
    baseUrl: '', //leave this blank for the first exercise
    endpoints: [
      {method: 'GET', path: '/api', description: 'Describes all available endpoints'},
      {method: 'GET', path: '/api/profile', description: 'Data about me'},
      {method: 'GET', path: '/api/books/', description: 'Get All books information'},
      {method: 'POST', path: '/api/books/', description: 'Add new book information'},
      {method: 'PUT', path: '/api/books/:id', description: 'Update book information via id'},
      {method: 'DELETE', path: '/api/books/:id', description: 'Delete book information via id'}
      // TODO: Write other API end-points description here like above
    ]
  })
});
// TODO:  Fill the values
app.get('/api/profile', (req, res) => {
  res.json({
    'name': req.body.name,
    'homeCountry': req.body.homeCountry,
    'degreeProgram': 'informatics',//informatics or CSE.. etc
    'email': req.body.email,
    'deployedURLLink': '',//leave this blank for the first exercise
    'apiDocumentationURL': '', //leave this also blank for the first exercise
    'currentCity': req.body.currentCity,
    'hobbies': []

  })
});
/*
 * Get All books information
 */
app.get('/api/books/', (req, res) => {
  /*
   * use the books model and query to mongo database to get all objects
   */
  db.books.find({}, function (err, books) {
    if (err) throw err;
    /*
     * return the object as array of json values
     */
    res.json(books);
  });
});
/*
 * Add a book information into database
 */
app.post('/api/books/', (req, res) => {
  /*
   * New Book information in req.body
   */
  console.log(req.body);
  /*
   * use the books model and create a new object 
   * with the information in req.body
   */
  let book = req.body;
  Books.create({
		title: book.title,
    author: book.author,
    releaseDate: book.releaseDate,
    genre: book.genre,
    rating: book.rating,
    language: book.language
	}, function(err, book) {
		if (err)
      res.send(err);
      
		Books.find(function(err, book) {
			if (err)
				res.send(err)
			res.json(book);
		});
	});
  /*
   * return the new book information object as json
   */
});
/*
 * Update a book information based upon the specified ID
 */
app.put('/api/books/:id', (req, res) => {
  /*
   * Get the book ID and new information of book from the request parameters
   */
  Books.updateOne({_id:req.params.id}, req.body, function (err, place) {
    res.send(place);
  });
});
/*
 * Delete a book based upon the specified ID
 */
app.delete('/api/books/:id', (req, res) => {
  /*
   * Get the book ID of book from the request parameters
   */
  console.log(req.params._id);
  let id = req.params.id;
  Books.deleteOne({ _id: id });
  Books.remove({ _id : id}, 
    function(err) {
		if (err)
			res.send(err);
		else
			res.send('Successfully! Employee has been Deleted.');	
	});
});

/**********
 * SERVER *
 **********/

// listen on the port 3000
app.listen(process.env.PORT || 80, () => {
  console.log('Express server is up and running on http://localhost:80/');
});