NodeJS: Connect to MongoDB

nodejs-mongodb.js

// MongoClient -- callbacks
var assert = require('assert')
var MongoClient = require('mongodb').MongoClient
MongoClient.connect('mongodb://localhost:27017/test', function(err,db) {
  assert.equal(null,err)
  console.log('connected')
  db.collection('test').find().toArray(function(err,res) {
    assert.equal(null,err)
    console.log(res)
  })
})


// MongoClient -- callbacks with auth
var assert = require('assert')
var MongoClient = require('mongodb').MongoClient
MongoClient.connect('mongodb://localhost:27017/', function(err,db) {
  assert.equal(null,err)
  console.log('connected')
  db.authenticate('user','password', function(err,res) {
    assert.equal(null,err)
    console.log('authed')
    db.db('test').collection('test').find().toArray(function(err,res) {
      console.log(res)
    })
  })
})


// MongoClient -- promises
var MongoClient = require('mongodb').MongoClient
var conn = MongoClient.connect('mongodb://localhost:27017')
var db = conn.then(conn => conn.db('test'))
var res = db.then(db => db.collection('test').find().toArray())


// MongoClient -- promises with auth 1 -- credentials in URI
var MongoClient = require('mongodb').MongoClient
var conn = MongoClient.connect('mongodb://user:password@localhost:27017')
var res = conn.then(con => con.db('test').collection('test').find().toArray())


// MongoClient -- promises with auth 2 -- separate authentication step
var MongoClient = require('mongodb').MongoClient
var conn = MongoClient.connect('mongodb://localhost:27017')
var auth = conn.then(db => db.authenticate('user','password'))
var res = auth.then(() => conn.then(con => con.db('test').collection('test').find().toArray()))


// MongoClient -- promises with auth 3 -- authentication step returns authenticated connection object
var MongoClient = require('mongodb').MongoClient
var conn = MongoClient.connect('mongodb://localhost:27017')
var authconn = conn.then(con => con.authenticate('user','password').then(() => con))
var res = authconn.then(con => con.db('test').collection('test').find().toArray())