Basic express mongodb todo application

{
  "name": "todo",
  "version": "0.0.1",
  "private": true,
  "dependencies": {
    "express": "*",
    "jade": "*",
    "mongodb": "*"
  }
}

var express = require('express')
var MongoClient = require('mongodb').MongoClient
var Server = require('mongodb').Server
var Connection = require('mongodb').Connection
var ObjectID = require('mongodb').ObjectID
var format = require('util').format

var mongo_host = process.env['MONGO_NODE_DRIVER_HOST'] || 'localhost'
var mongo_port = process.env['MONGO_NODE_DRIVER_PORT'] || Connection.DEFAULT_PORT
var mongo_db = 'test'
var mongo_url = format('mongodb://%s:%s/%s?w=1', mongo_host, mongo_port, mongo_db)
var express_port = process.env['PORT'] || 3000

var app = express()

app.set('port', express_port)
app.set('views', __dirname + '/views')
app.set('view engine', 'jade')

app.use(express.bodyParser())
app.use(express.methodOverride())

app.get('/', function (req, res) {
  MongoClient.connect(mongo_url, function (err, db) {
    if (err) console.log(err)
    else {
      db.collection('todo').aggregate(
        [
          {
            $project: { todo: 1, status: 1 }
          }
        ],
        function (err, records) {
          db.close()
          if (err) console.log(err)
          else {
            console.log(records)
            res.render('home', { title: 'Home', items: records })
          }
        }
      )
    }
  })
})

app.post('/', function (req, res) {
  var todo = req.param('todo', null)
  MongoClient.connect(mongo_url, function (err, db) {
    if (err) console.log(err)
    else {
      db.collection('todo').insert({ todo: todo, created: new Date(), changed: new Date() }, function (err, records) {
        db.close()
        if (err) console.log(err)
        else {
          console.log(records)
          res.redirect('/')
        }
      })
    }
  })
})

app.put('/', function (req, res) {
  var _id = req.param('_id', null)
  var status = 'on' == req.param('status', false)
  var todo = req.param('todo', null)

  MongoClient.connect(mongo_url, function (err, db) {
    if (err) console.log(err)
    else {
      db.collection('todo').update(
        { _id: new ObjectID(_id) },
        { $set: { status: status, todo: todo, changed: new Date() } },
        function (err, records_affected) {
          db.close()
          if (err) console.log(err)
          else {
            console.log(records_affected)
            res.redirect('/')
          }
        }
      )
    }
  })
})

app.delete('/', function (req, res) {
  var _id = req.param('_id', null)

  MongoClient.connect(mongo_url, function (err, db) {
    if (err) console.log(err)
    else {
      db.collection('todo').remove({ _id: new ObjectID(_id) }, function (err, records_affected) {
        db.close()
        if (err) console.log(err)
        else {
          console.log(records_affected)
          res.redirect('/')
        }
      })
    }
  })
})

app.listen(express_port)
console.log(format('Listening on http://localhost:%d', express_port))

doctype 5
title= title
link(href="//netdna.bootstrapcdn.com/twitter-bootstrap/latest/css/bootstrap-combined.min.css", rel="stylesheet")
div.container-fluid(style="padding:20px")
	block content

extends layout

block content
	h1= title

	form.form-inline(method="post", action="/")
		input(type="text", name="todo", placeholder="todo", required)
		input.btn(type="submit", value="Add")

	each item in items
		div.row-fluid
			form.form-inline(method="post", action="/", style="float:left")
				input(type="hidden", name="_method", value="put")
				input(type="hidden", name="_id", value=item._id)
				label.checkbox
					input.checkbox(type="checkbox", checked=item.status, name="status")
				input(value=item.todo, type="text", name="todo", placeholder="todo", required)
				input.btn.btn-primary(type="submit", value="Update")
			form.form-inline(method="post", action="/", style="float:left")
				input(type="hidden", name="_method", value="delete")
				input(type="hidden", name="_id", value=item._id)
				input.btn.btn-danger(type="submit", value="Delete")