mongodb-tutorial.js

const path = require('path')
const express = require('express')
const app = express()
const bodyParser = require('body-parser')
const mongodb = require('mongodb').MongoClient

// MongoDB Snippet
const mongodbUrl = 'mongodb://localhost:27017' // Local MongoDB Server Address
mongodb.connect(mongodbUrl, function(err, client) { // Connect to local MongoDB Server
  
  // Use database 'test'
  let db = client.db('test')
  
  // Save data to collection 'list'
  db.collection('list').save({
    "name": "jason"
  }, function(err, result) {
    console.log(result.result);
    client.close()
  });
  
  // Find data from collection 'list'
  db.collection('list').find({
    "name": "jason"
  }).toArray(function(err, items) {
    console.log(items)
    client.close()
  })
  
})



// create application/json parser
app.use(bodyParser.json())

// create application/x-www-form-urlencoded parser
app.use(bodyParser.urlencoded({
  extended: false
}))

let count = 0

app.use(express.static('public'))

app.get('/', function(req, res) {
  res.sendFile(path.join(__dirname, 'demo.html'))
})

app.get('/welcome', function(req, res) {
  mongodb.connect(mongodbUrl, function(err, client) {
    let db = client.db('test')
    db.collection('list').find({
      "name": "jason"
    }).toArray(function(err, items) {
      console.log(items)
      res.send(items)
      client.close()
    })
  })
})

app.get('/info', function(req, res) {
  ++count
  console.log(count)
  const info = {
    name: 'rootn',
    count: count
  }
  res.send(info)
})

app.post('/entrance', function(req, res) {
  console.log('post data:')
  console.log(req.body)
  mongodb.connect(mongodbUrl, function(err, client) {
    var db = client.db('test')
    db.collection('list').save(req.body, function(err, result) {
      console.log(result.result);
      client.close();
    });
  })
  res.json({"message": "ok"})
})

app.listen(3000, function() {
  console.log('Example app listening on port 3000!');
})