'use strict'

const MongoClient = require('mongodb').MongoClient
const express = require('express')
const app = express()

var url = 'mongodb://localhost:27017/test';

MongoClient.connect(url, function(err, db) {
  if (err) { throw err }
  const collection = db.collection('data')
  app.get('/hello', (req, res) => {
    collection.findOne({}, function sum (err, data) {
      res.send('' + data.value)
    })
  })

  app.listen(3000)
})