apiServer.js

var express = require('express');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var logger = require('morgan');
const session = require('express-session');
const MongoStore = require('connect-mongo')(session);

var app = express();

app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());

//APIS
var mongoose = require('mongoose');
mongoose.connect('mongodb://kilims:password@localhost:27017/bookshop');

var db = mongoose.connection;
db.on('error', console.error.bind(console, '#MongoDB - connection error: '))

// --> Set up Sessions
app.use(session({
  secret: 'mySecretString',
  saveUninitialized: false,
  resave: false,
  cookie: {maxAge: 1000 * 60 * 60 * 24 * 2},
  store: new MongoStore({mongooseConnection: db, ttl: 2 * 24 * 60 * 60})
}))

// ---->> Save to session cart API
app.post('/cart', function(req, res) {
  var cart = req.body;
  req.session.cart = cart;
  req.session.save(function(err) {
    if (err) {
      throw err;
    }
    res.json(req.session.cart);
  })
})

// ---->> Get session cart API
app.get('/cart', function(req, res) {
  if (typeof req.session.cart !== 'undefined') {
    res.json(req.session.cart);
  }
})

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

//----->>  Post BOOKs  <<-----
app.post('/books', function(req, res) {
  var book = req.body;
  Books.create(book, function(err, books) {
    if (err) {
      throw err;
    } 
    res.json(books);
  });
});

//----->>  Get BOOKs  <<-----
app.get('/books', function(req, res) {
  Books.find(function(err, books) {
    if (err) {
      throw err;
    }
    res.json(books)
  });
});

//----->>  Delete BOOKs  <<-----
app.delete('/books/:_id', function(req, res) {
  var query = {_id: req.params._id};

  Books.remove(query, function(err, books) {
    if (err) {
      console.log("# API DELETE BOOKS: ", err)
    }
    res.json(books);
  });
});


//----->>  Update BOOKs  <<-----
app.put('/books/:_id', function(req, res) {
  var book = req.body;
  var query = req.params._id;

  var update = {
    '$set':{
      title: book.title,
      description:book.description,
      images: book.images,
      price: book.price
    }
  };

  var options = {new: true};

  Books.findOneAndUpdate(query, update, options, function(err, books) {
    if (err) {
      throw err;
    }
    res.json(books);
  })
});

//----->>  Get BOOKS Images API  <<-----
app.get('/images', function(req, res) {
  const imgFolder = __dirname + '/public/images/';
  const fs = require('fs');

  fs.readdir(imgFolder, function(err, files) {
    if (err) {
      return console.error(err);
    }
    const filesArr = [];
    files.forEach(function(file) {
      filesArr.push({name: file});
    });
    res.json(filesArr);
  })
})


app.listen(3001, function(err) {
  if (err) {
    return console.log(err);
  }
  console.log("API server is running on http://localhost:3001   ");
})