Add files via upload

app.js

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+var createError = require('http-errors');
+var express = require('express');
+var path = require('path');
+var cookieParser = require('cookie-parser');
+var logger = require('morgan');
+
+var userRouter = require('./routes/user');
+var adminRouter = require('./routes/admin');
+var hbs = require('express-handlebars')
+var fileUpload =require('express-fileupload')
+var app = express();
+var db=require('./config/connection')
+var session =require('express-session')
+
+// view engine setup
+app.set('views', path.join(__dirname, 'views'));
+app.set('view engine', 'hbs');
+app.engine('hbs', hbs.engine({extname: 'hbs',defaultLayout: 'layout', layoutsDir:__dirname + '/views/layout/', partialsDir:__dirname+'/views/partials/'}));
+
+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(fileUpload())
+app.use(session({secret:'key',resave: true,saveUninitialized: true,cookie:{maxAge:60000000}}))
+db.connect((err)=>{
+  if(err) console.log("connection error" +err)
+  else console.log("database connected")
+})
+
+app.use('/', userRouter);
+app.use('/admin', adminRouter);
+
+// catch 404 and forward to error handler
+app.use(function(req, res, next) {
+  next(createError(404));
+});
+
+// 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;

bin/www

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+#!/usr/bin/env node
+
+/**
+ * Module dependencies.
+ */
+
+var app = require('../app');
+var debug = require('debug')('shoppingcart: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);
+}

config/collection.js

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+module.exports={
+    PRODUCT_COLLECTION:'product',
+    USER_COLLECTION:'user',
+    CART_COLLECTION:'cart',
+    ORDER_COLLECTION:'order'
+
+}

config/connection.js

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+var MongoClient = require('mongodb').MongoClient;
+const state={
+    db:null
+}
+module.exports.connect=function(done){
+    const url = "mongodb://localhost:27017"
+    const dbname ="shopping"
+    MongoClient.connect(url, function(err, data) {
+        if (err) throw err;
+        state.db=data.db(dbname)
+        done();
+      });
+}
+module.exports.get=function(){
+    return state.db
+}
+

helpers/product-helpers.js

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+var db = require('../config/connection')
+var collection =require('../config/collection')
+const { ObjectID } = require('bson')
+var objectId=require('mongodb').ObjectId
+
+
+module.exports = {
+    addProduct: (product, callback) => {
+        db.get().collection('product').insertOne(product).then((data) => {
+            var id = data.insertedId.toString()             
+            callback(id)
+        })
+    },
+    getAllProduct:()=>{
+        return new Promise(async(resolve,reject)=>{
+            let product=await db.get().collection(collection.PRODUCT_COLLECTION).find().toArray()
+            resolve(product)
+        })
+    },
+    deleteProduct:(prodId)=>{
+        return new Promise((resolve,reject)=>{
+            db.get().collection(collection.PRODUCT_COLLECTION).deleteOne({_id:objectId(prodId)}).then((response)=>{
+                resolve(response)
+            })
+        })
+    },   
+    getProductDetails:(prodId)=>{
+        return new Promise((resolve,reject)=>{
+            db.get().collection(collection.PRODUCT_COLLECTION).findOne({_id:objectId(prodId)}).then((product)=>{
+                resolve(product)
+            })
+        })
+    },
+    updateProduct:(proid,prodetails)=>{
+        return new Promise((resolve,reject)=>{
+            db.get().collection(collection.PRODUCT_COLLECTION).updateOne({_id:ObjectID(proid)},{
+                $set:{
+                    Name :prodetails.Name,
+                    Discription :prodetails.Discription,
+                    Price : prodetails.Price,
+                    Category: prodetails.Category
+                }
+            }).then((response)=>{
+                resolve()
+
+            })
+        })
+    }
+
+
+}