diff --git a/app.js b/app.js
new file mode 100644
index 0000000..c88d5c4
--- /dev/null
+++ b/app.js
@@ -0,0 +1,60 @@
+const express = require('express');
+const path = require('path');
+const favicon = require('serve-favicon');
+const logger = require('morgan');
+const cookieParser = require('cookie-parser');
+const bodyParser = require('body-parser');
+
+const mongoose = require('mongoose');
+const dbUrl = 'mongodb://localhost:27017/library'
+
+const index = require('./routes/index');
+const users = require('./routes/users');
+const books = require('./routes/books');
+const customers = require('./routes/customers');
+const transactions = require('./routes/transactions');
+
+const app = express();
+
+// view engine setup
+app.set('views', path.join(__dirname, 'views'));
+app.set('view engine', 'ejs');
+
+// uncomment after placing your favicon in /public
+//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
+app.use(logger('dev'));
+app.use(bodyParser.json());
+app.use(bodyParser.urlencoded({ extended: false }));
+app.use(cookieParser());
+app.use(express.static(path.join(__dirname, 'public')));
+
+mongoose.connect(dbUrl, (err) => {
+  if(!err) {console.log('Connected to Database');}
+  else {throw new Error(err);}
+})
+
+app.use('/', index);
+app.use('/users', users);
+app.use('/books', books);
+app.use('/customers', customers);
+app.use('/transactions', transactions)
+
+// catch 404 and forward to error handler
+app.use(function(req, res, next) {
+  var err = new Error('Not Found');
+  err.status = 404;
+  next(err);
+});
+
+// error handler
+app.use(function(err, req, res, next) {
+  // set locals, only providing error in development
+  res.locals.message = err.message;
+  res.locals.error = req.app.get('env') === 'development' ? err : {};
+
+  // render the error page
+  res.status(err.status || 500);
+  res.render('error');
+});
+
+module.exports = app;
diff --git a/bin/www b/bin/www
new file mode 100755
index 0000000..d664139
--- /dev/null
+++ b/bin/www
@@ -0,0 +1,90 @@
+#!/usr/bin/env node
+
+/**
+ * Module dependencies.
+ */
+
+var app = require('../app');
+var debug = require('debug')('mongoose-crud: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);
+}
diff --git a/controllers/books.controller.js b/controllers/books.controller.js
new file mode 100644
index 0000000..77ed0ff
--- /dev/null
+++ b/controllers/books.controller.js
@@ -0,0 +1,77 @@
+'use strict'
+const Book = require('../models/Book');
+
+module.exports = {
+    create: (req,res) => {
+        const {isbn, title, author, category, stock} = req.body
+        const newBook = new Book({
+            isbn: isbn || '978-1-xxxxxx-xx-x',
+            title: title || 'Untitled',
+            author: author || 'Unkown',
+            category: category || 'Unrated',
+            stock: stock || 1
+        });
+        newBook
+            .save()
+            .then((response) => {
+                return res.status(201).json({
+                    message: "New Book Created!",
+                    response
+                })
+            })
+            .catch((err) => {
+                return res.status(500).json({
+                    message: err
+                })
+            })
+    },
+
+    readAll: (req, res) => {
+        Book
+            .find()
+            .exec()
+            .then((books) => {
+                res.status(200).send(books)
+            })
+            .catch((err) => {
+                return res.status(500).json({
+                    message: err
+                })
+            })
+    },
+
+    updateOne: (req, res) => {
+        Book
+            .findByIdAndUpdate(
+                {_id: req.params.id},
+                {$set: req.body}
+            )
+            .then((response) => {
+                return res.status(200).json({
+                    message: "Book Updated!",
+                    response
+                })
+            })
+            .catch((err) => {
+                return res.status(500).json({
+                    message: err
+                })
+            })
+    },
+
+    deleteOne: (req, res) => {
+        Book
+            .remove({_id: req.params.id})
+            .then((response) => {
+                res.status(200).json({
+                    message: 'Book Deleted',
+                    response
+                })
+            })
+            .catch((err) => {
+                return res.status(500).json({
+                    message: err
+                })
+            })
+    }
+}
\ No newline at end of file
diff --git a/controllers/customer.controller.js b/controllers/customer.controller.js
new file mode 100644
index 0000000..56a2478
--- /dev/null
+++ b/controllers/customer.controller.js
@@ -0,0 +1,77 @@
+'use strict'
+const Customer = require('../models/Customer');
+
+module.exports = {
+    create: (req,res) => {
+        const {name, memberid, address, zipcode, phone} = req.body
+        const newCustomer = new Customer({
+            name: name || 'No name',
+            memberid: memberid || 'CLXXX',
+            address: address || 'Nomad',
+            zipcode: zipcode || 'xxxxx',
+            phone: phone || '911'
+        });
+        newCustomer
+            .save()
+            .then((response) => {
+                return res.status(201).json({
+                    message: "New Customer Created!",
+                    response
+                })
+            })
+            .catch((err) => {
+                return res.status(500).json({
+                    message: err
+                })
+            })
+    },
+
+    readAll: (req, res) => {
+        Customer
+            .find()
+            .exec()
+            .then((customers) => {
+                res.status(200).send(customers)
+            })
+            .catch((err) => {
+                return res.status(500).json({
+                    message: err
+                })
+            })
+    },
+
+    updateOne: (req, res) => {
+        Customer
+            .findByIdAndUpdate(
+                {_id: req.params.id},
+                {$set: req.body}
+            )
+            .then((response) => {
+                return res.status(200).json({
+                    message: "Customer Data Updated!",
+                    response
+                })
+            })
+            .catch((err) => {
+                return res.status(500).json({
+                    message: err
+                })
+            })
+    },
+
+    deleteOne: (req, res) => {
+        Customer
+            .remove({_id: req.params.id})
+            .then((response) => {
+                res.status(200).json({
+                    message: 'Customer data Deleted',
+                    response
+                })
+            })
+            .catch((err) => {
+                return res.status(500).json({
+                    message: err
+                })
+            })
+    }
+}
\ No newline at end of file
diff --git a/controllers/transaction.controller.js b/controllers/transaction.controller.js
new file mode 100644
index 0000000..0a85257
--- /dev/null
+++ b/controllers/transaction.controller.js
@@ -0,0 +1,96 @@
+'use strict'
+const Transaction = require('../models/Transaction');
+
+module.exports = {
+    create: (req,res) => {
+        const {member, days, out_date, booklist} = req.body;
+        const newTransaction = new Transaction({
+            member: member || '5a9e6edb3320151b49e960b0',
+            days: days || 3,
+            out_date: out_date,
+            booklist: booklist || []
+        });
+        newTransaction
+            .save()
+            .then((response) => {
+                return res.status(201).json({
+                    message: "New Transaction Created!",
+                    response
+                })
+            })
+            .catch((err) => {
+                return res.status(500).json({
+                    message: err
+                })
+            })
+    },
+
+    readAll: (req, res) => {
+        Transaction
+            .find()
+            .populate('member')
+            .populate('booklist')
+            .exec()
+            .then((transactions) => {
+                res.status(200).send(transactions)
+            })
+            .catch((err) => {
+                return res.status(500).json({
+                    message: err
+                })
+            })
+    },
+
+    updateOne: (req, res) => {
+        Transaction
+            .findById(req.params.id)
+            .then((trans) => {
+                if(trans) {
+                    req.body.due_date = trans.due_date
+                    Transaction
+                        .update(
+                            {_id: req.params.id},
+                            {$set: req.body}
+                        )
+                        .then((data) => res.send(trans))
+                } else {reject()}
+            })
+            .catch((err) => {
+                return res.status(500).json({
+                    message: 'Transaction not exist'
+                })
+            })
+        // Transaction
+        //     .findByIdAndUpdate(
+        //         {_id: req.params.id},
+        //         {$set: req.body}
+        //     )
+        //     .then((response) => {
+        //         return res.status(200).json({
+        //             message: "Transaction Data Updated!",
+        //             response
+        //         })
+        //     })
+        //     .catch((err) => {
+        //         return res.status(500).json({
+        //             message: err
+        //         })
+        //     })
+    },
+
+    deleteOne: (req, res) => {
+        Transaction
+            .remove({_id: req.params.id})
+            .then((response) => {
+                res.status(200).json({
+                    message: 'Transaction data Deleted',
+                    response
+                })
+            })
+            .catch((err) => {
+                return res.status(500).json({
+                    message: err
+                })
+            })
+    }
+}
\ No newline at end of file
diff --git a/models/Book.js b/models/Book.js
new file mode 100644
index 0000000..1019ab6
--- /dev/null
+++ b/models/Book.js
@@ -0,0 +1,12 @@
+'use strict'
+
+const mongoose = require('mongoose');
+const schema = mongoose.Schema;
+
+module.exports = mongoose.model('Book', schema({
+    isbn: String,
+    title: String,
+    author: String,
+    category: String,
+    stock: Number
+}));
\ No newline at end of file
diff --git a/models/Customer.js b/models/Customer.js
new file mode 100644
index 0000000..a451889
--- /dev/null
+++ b/models/Customer.js
@@ -0,0 +1,12 @@
+'use strict'
+
+const mongoose = require('mongoose');
+const schema = mongoose.Schema;
+
+module.exports = mongoose.model('Customer', schema({
+    name: String,
+    memberid: String,
+    address: String,
+    zipcode: String,
+    phone: String
+}))
\ No newline at end of file
diff --git a/models/Transaction.js b/models/Transaction.js
new file mode 100644
index 0000000..c1b31c2
--- /dev/null
+++ b/models/Transaction.js
@@ -0,0 +1,37 @@
+'use strict'
+
+const mongoose = require('mongoose');
+const schema = mongoose.Schema;
+
+module.exports = mongoose.model('Transaction', schema({
+    member: {
+        type: schema.Types.ObjectId,
+        ref: 'Customer'
+    },
+    days: Number,
+    out_date : {
+        type: Date,
+        default: Date.now
+    },
+    due_date : Date,
+    in_date : Date,
+    fine: Number,
+    booklist: [{
+        type: schema.Types.ObjectId,
+        ref: 'Book'
+    }]})
+    .pre('save', function() {
+        this.due_date = +new Date(this.out_date) + Number(this.days)*24*60*60*1000;
+    })
+    .pre("update", function() {
+        console.log('=====>',this._update.$set)
+        this._update.$set.in_date = new Date();
+        let diffDays = this._update.$set.in_date.getDate() - this._update.$set.due_date.getDate();
+        console.log(Math.abs(diffDays))
+        if(diffDays<0) {
+            this._update.$set.fine = Math.abs(diffDays)*1000
+        } else {
+            this._update.$set.fine = 0;
+        }
+    })
+)
\ No newline at end of file
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..e68bbaa
--- /dev/null
+++ b/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "mongoose-crud",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "start": "node ./bin/www"
+  },
+  "dependencies": {
+    "body-parser": "~1.18.2",
+    "cookie-parser": "~1.4.3",
+    "debug": "~2.6.9",
+    "ejs": "~2.5.7",
+    "express": "~4.15.5",
+    "mongoose": "^5.0.9",
+    "morgan": "~1.9.0",
+    "serve-favicon": "~2.4.5"
+  }
+}
diff --git a/public/stylesheets/style.css b/public/stylesheets/style.css
new file mode 100644
index 0000000..9453385
--- /dev/null
+++ b/public/stylesheets/style.css
@@ -0,0 +1,8 @@
+body {
+  padding: 50px;
+  font: 14px "Lucida Grande", Helvetica, Arial, sans-serif;
+}
+
+a {
+  color: #00B7FF;
+}
diff --git a/routes/books.js b/routes/books.js
new file mode 100644
index 0000000..6e00197
--- /dev/null
+++ b/routes/books.js
@@ -0,0 +1,11 @@
+'use strict'
+
+const router = require('express').Router();
+const {create ,readAll, updateOne, deleteOne} = require('../controllers/books.controller');
+
+router.post('/', create);
+router.get('/', readAll);
+router.put('/:id', updateOne);
+router.delete('/:id', deleteOne);
+
+module.exports = router;
\ No newline at end of file
diff --git a/routes/customers.js b/routes/customers.js
new file mode 100644
index 0000000..6735423
--- /dev/null
+++ b/routes/customers.js
@@ -0,0 +1,11 @@
+'use strict'
+
+const router = require('express').Router();
+const {create ,readAll, updateOne, deleteOne} = require('../controllers/customer.controller');
+
+router.post('/', create);
+router.get('/', readAll);
+router.put('/:id', updateOne);
+router.delete('/:id', deleteOne);
+
+module.exports = router;
\ No newline at end of file
diff --git a/routes/index.js b/routes/index.js
new file mode 100644
index 0000000..ecca96a
--- /dev/null
+++ b/routes/index.js
@@ -0,0 +1,9 @@
+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;
diff --git a/routes/transactions.js b/routes/transactions.js
new file mode 100644
index 0000000..d7b3fea
--- /dev/null
+++ b/routes/transactions.js
@@ -0,0 +1,11 @@
+'use strict'
+
+const router = require('express').Router();
+const {create ,readAll, updateOne, deleteOne} = require('../controllers/transaction.controller');
+
+router.post('/', create);
+router.get('/', readAll);
+router.put('/:id', updateOne);
+router.delete('/:id', deleteOne);
+
+module.exports = router;
\ No newline at end of file
diff --git a/routes/users.js b/routes/users.js
new file mode 100644
index 0000000..623e430
--- /dev/null
+++ b/routes/users.js
@@ -0,0 +1,9 @@
+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;
diff --git a/views/error.ejs b/views/error.ejs
new file mode 100644
index 0000000..7cf94ed
--- /dev/null
+++ b/views/error.ejs
@@ -0,0 +1,3 @@
+<h1><%= message %></h1>
+<h2><%= error.status %></h2>
+<pre><%= error.stack %></pre>
diff --git a/views/index.ejs b/views/index.ejs
new file mode 100644
index 0000000..7b7a1d6
--- /dev/null
+++ b/views/index.ejs
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title><%= title %></title>
+    <link rel='stylesheet' href='/stylesheets/style.css' />
+  </head>
+  <body>
+    <h1><%= title %></h1>
+    <p>Welcome to <%= title %></p>
+  </body>
+</html>