adding updated api example

codeExamples/week2/serverCode/apisIntro/api-demo-v2/.gitignore

+.DS_STORE
+
+node_modules
\ No newline at end of file

codeExamples/week2/serverCode/apisIntro/api-demo-v2/app.js

+var express = require('express');
+var path = require('path');
+var cookieParser = require('cookie-parser');
+var logger = require('morgan');
+var mongoose = require('mongoose');
+
+var indexRouter = require('./routes/index');
+var usersRouter = require('./routes/users');
+var booksRouter = require('./routes/api/books');
+
+var bodyParser = require('body-parser');
+
+var app = express();
+
+app.use(logger('dev'));
+app.use(express.json());
+app.use(express.urlencoded({ extended: false }));
+app.use(cookieParser());
+app.use(express.static(path.join(__dirname, 'public')));
+app.use(bodyParser.json());
+app.use(bodyParser.urlencoded({ extended: true }));
+
+app.use('/', indexRouter);
+app.use('/users', usersRouter);
+app.use('/api/books', booksRouter);
+
+const db = mongoose.connect('mongodb+srv://dbadmin:dbpassword@cmsc388b.a9mha.mongodb.net/388-arasevic?retryWrites=true&w=majority', 
+    { useNewUrlParser: true,  useUnifiedTopology: true});
+module.exports = app;

codeExamples/week2/serverCode/apisIntro/api-demo-v2/bin/www

+#!/usr/bin/env node
+
+/**
+ * Module dependencies.
+ */
+
+var app = require('../app');
+var debug = require('debug')('api-demo:server');
+var http = require('http');
+
+/**
+ * Get port from environment and store in Express.
+ */
+
+var port = normalizePort(process.env.PORT || '3000');
+app.set('port', port);
+
+/**
+ * Create HTTP server.
+ */
+
+var server = http.createServer(app);
+
+/**
+ * Listen on provided port, on all network interfaces.
+ */
+
+server.listen(port);
+server.on('error', onError);
+server.on('listening', onListening);
+
+/**
+ * Normalize a port into a number, string, or false.
+ */
+
+function normalizePort(val) {
+  var port = parseInt(val, 10);
+
+  if (isNaN(port)) {
+    // named pipe
+    return val;
+  }
+
+  if (port >= 0) {
+    // port number
+    return port;
+  }
+
+  return false;
+}
+
+/**
+ * Event listener for HTTP server "error" event.
+ */
+
+function onError(error) {
+  if (error.syscall !== 'listen') {
+    throw error;
+  }
+
+  var bind = typeof port === 'string'
+    ? 'Pipe ' + port
+    : 'Port ' + port;
+
+  // handle specific listen errors with friendly messages
+  switch (error.code) {
+    case 'EACCES':
+      console.error(bind + ' requires elevated privileges');
+      process.exit(1);
+      break;
+    case 'EADDRINUSE':
+      console.error(bind + ' is already in use');
+      process.exit(1);
+      break;
+    default:
+      throw error;
+  }
+}
+
+/**
+ * Event listener for HTTP server "listening" event.
+ */
+
+function onListening() {
+  var addr = server.address();
+  var bind = typeof addr === 'string'
+    ? 'pipe ' + addr
+    : 'port ' + addr.port;
+  debug('Listening on ' + bind);
+}

codeExamples/week2/serverCode/apisIntro/api-demo-v2/models/book.js

+var mongoose = require('mongoose');
+var Schema = mongoose.Schema;
+const bookModel = new Schema({
+    title: { type: String   },
+    author: { type: String }
+})
+//export default mongoose.model('book', bookModel)
+module.exports = mongoose.model('Book', bookModel)
\ No newline at end of file

codeExamples/week2/serverCode/apisIntro/api-demo-v2/package-lock.json

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+}

codeExamples/week2/serverCode/apisIntro/api-demo-v2/package.json

+{
+  "name": "api-demo",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "start": "node ./bin/www"
+  },
+  "dependencies": {
+    "body-parser": "^1.18.3",
+    "cookie-parser": "~1.4.3",
+    "debug": "~2.6.9",
+    "express": "~4.16.0",
+    "mongoose": "^5.13.13",
+    "morgan": "~1.9.0"
+  }
+}

codeExamples/week2/serverCode/apisIntro/api-demo-v2/public/index.html

+<html>
+
+<head>
+  <title>Express</title>
+  <link rel="stylesheet" href="/stylesheets/style.css">
+</head>
+
+<body>
+  <h1>Express</h1>
+  <p>Welcome to Express</p>
+</body>
+
+</html>

codeExamples/week2/serverCode/apisIntro/api-demo-v2/public/stylesheets/style.css

+body {
+  padding: 50px;
+  font: 14px "Lucida Grande", Helvetica, Arial, sans-serif;
+}
+
+a {
+  color: #00B7FF;
+}

codeExamples/week2/serverCode/apisIntro/api-demo-v2/routes/api/books.js

+var express = require('express');
+var bookRouter = express.Router();
+var Book = require('../../models/book')
+
+/* GET books listing. */
+
+bookRouter.use('/', (req, res, next)=>{
+  console.log("I run first before any http request")
+  next()
+})
+
+bookRouter.use('/:bookId', (req, res, next)=>{
+  console.log("I run only when I match the /:bookId route")
+  Book.findById( req.params.bookId, (err,book)=>{
+    if(err)
+        res.status(500).send(err)
+    else {
+        req.book = book;
+        next()
+    }
+  })
+})
+bookRouter.route('/')
+  .get((req, res) => {
+    Book.find({}, (err, books) => {
+      res.json(books)
+    })
+  })  
+  .post((req, res) => {
+    let book = new Book(req.body); 
+    book.save();
+    res.status(201).send(book) 
+  });
+
+
+bookRouter.route('/:bookId')
+  .get((req, res) => {
+    //querying the database for a book that matches the bookID parameter from the URL request
+   // Book.findById(req.params.bookId, (err, book) => {
+     // res.json(book)
+      // when using middleware
+      res.json(req.book)
+    //}) 
+  })
+  .put((req,res) => {
+    //first retrieve the instance of the resource you want
+    //update its values
+    //Book.findById(req.params.bookId, (err, book) => {
+      //  book.title = req.body.title;
+        //book.author = req.body.author;
+        //book.save()
+        //res.json(book)
+        
+        // when using middleware
+        req.book.title = req.body.title;
+        req.book.author = req.body.author;
+        req.book.save()
+        res.json(req.book)
+    
+  })
+  .delete((req,res)=>{
+    Book.findById(req.params.bookId, (err, book) => {
+        // with middleware
+        //  req.book.remove(err => {
+        book.remove(err => {
+            if(err){
+                res.status(500).send(err)
+            }
+            else{
+                res.status(204).send('removed')
+            }
+        })
+    })
+  })
+  
+
+module.exports = bookRouter;
\ No newline at end of file

codeExamples/week2/serverCode/apisIntro/api-demo-v2/routes/index.js

+var express = require('express');
+var router = express.Router();
+
+/* GET home page. */
+router.get('/', function(req, res, next) {
+  res.render('index', { title: 'Express' });
+});
+
+module.exports = router;

codeExamples/week2/serverCode/apisIntro/api-demo-v2/routes/users.js

+var express = require('express');
+var router = express.Router();
+
+/* GET users listing. */
+router.get('/', function(req, res, next) {
+  res.send('respond with a resource');
+});
+
+module.exports = router;