save dulu

.gitignore

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+node_modules

app.js

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+const express = require('express');
+const bodyParser = require('body-parser');
+const app = express()
+
+app.set('port', process.env.PORT || 3000)
+
+app.use(bodyParser.json());
+app.use(bodyParser.urlencoded({ extended: true }));
+
+app.use('/books', require('./routes/books'));
+
+app.listen(app.get('port'), function(){
+  console.log('listening on port '+app.get('port'))
+})
+

controllers/books.js

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+let mongo = require('mongodb');
+let MongoClient = require('mongodb').MongoClient;
+let url = 'mongodb://localhost/library';
+const methods = {} 
+
+methods.getAll = function(req, res) {
+  MongoClient.connect(url, function(err, db) {
+    let bookCollection = db.collection('books');
+    bookCollection.find({})
+      .toArray(function(err, result) {
+        if (err) {
+          console.log(err)
+        } else {
+          res.send(result)
+        }
+      });
+  });
+}
+
+methods.getById = function(req, res) {
+  MongoClient.connect(url, function(err, db) {
+    let bookCollection = db.collection('books');
+    bookCollection.find({
+        _id: new mongo.ObjectID(req.params.id)
+      })
+      .toArray(function(err, result) {
+        if (err) {
+          console.log(err)
+        } else {
+          res.send(result)
+        }
+      });
+  });
+}
+
+methods.create = function(req, res) {
+  MongoClient.connect(url, function(err, db) {
+    let bookCollection = db.collection('books');
+    bookCollection.insert({
+      isbn: req.body.isbn,
+      title: req.body.title,
+      author: req.body.author,
+      category: req.body.category,
+      stock: req.body.stock
+    }, function(err, result) {
+      if (err) {
+        console.log(err)
+      } else {
+        res.send(result)
+      }
+    });
+  });
+}
+
+methods.updateById = function(req, res) {
+  MongoClient.connect(url, function(err, db) {
+    let bookCollection = db.collection('books');
+    bookCollection.updateOne({
+      _id: new mongo.ObjectID(req.params.id)
+    }, {
+      isbn: req.body.isbn,
+      title: req.body.title,
+      author: req.body.author,
+      category: req.body.category,
+      stock: parseInt(req.body.stock)
+    }, function(err, result) {
+      if (err) {
+        console.log(err)
+      } else {
+        res.send(result)
+      }
+    });
+  });
+}
+
+methods.deleteById = function(req, res) {
+  MongoClient.connect(url, function(err, db) {
+    let bookCollection = db.collection('books');
+    bookCollection.deleteOne({
+      _id: new mongo.ObjectID(req.params.id)
+    }, function(err, result) {
+      if (err) {
+        console.log(err)
+      } else {
+        res.send(result)
+      }
+    });
+  });
+}
+
+module.exports = methods