CRUD application code using nodejs,expressjs and mongodb

bookListController.js

'use strict';

var mongoose = require('mongoose'),
  Book = mongoose.model('Books');

exports.create_book = function(req, res) {
  var new_book = new Book(req.body);
  new_book.save(function(err, book) {
    if (err)
      res.send(err);
    res.send(book);
  });
};

exports.read_book = function(req, res) {
  Book.findById(req.params.bookId, function(err, book) {
    if (err)
      res.send(err);
    res.json(book);
  });
};

exports.display_all_books = function(req, res) {
  Book.find({}, function(err, book) {
    if (err)
      res.send(err);
    res.json(book);
  });
};

exports.update_book = function(req, res) {
  Book.findOneAndUpdate({_id:req.params.bookId}, req.body, {new: true}, function(err, book) {
    if (err)
      res.send(err);
    res.json(book);
  });
};

exports.delete_book = function(req, res) {
  Book.remove({
    _id: req.params.bookId
  }, function(err, book) {
    if (err)
      res.send(err);
    res.json({ message: 'Book deleted successfully!' });
  });
};

bookListModel.js

'use strict';
var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var BookSchema = new Schema({
  bookTitle: {
    type: String,
    required: true
  },
  author:{
    type: String,
    required: true
  },
  genre:{
    type: String,
    required: true
  },
  price:{
    type:Number,
    required: true
  }
});
module.exports = mongoose.model('Books', BookSchema);

bookListRoutes.js

'use strict';

module.exports = function(app) {
	var bookList = require('../controllers/bookListController');

	// todoList Routes
	app.route('/books')
		.get(bookList.display_all_books)
		.post(bookList.create_book);

	app.route('/books/:bookId')
		.get(bookList.read_book)
		.put(bookList.update_book)
		.delete(bookList.delete_book);
};

package.json

{
  "name": "booksapp",
  "version": "1.0.0",
  "description": "sample book-listing application",
  "main": "index.js",
  "scripts": {
    "start": "nodemon server.js"
  },
  "author": "Kevin Chisholm",
  "license": "ISC",
  "devDependencies": {
    "nodemon": "^1.17.4"
  },
  "dependencies": {
    "body-parser": "^1.18.3",
    "express": "^4.16.3",
    "mongoose": "^5.1.1"
  }
}