MongoError：第一次连接时无法连接到服务器

Question

const express = require('express')
const app = express()   //initialised express. using express by requiring it.
//conecting the server to browsers
const bodyParser = require('body-parser')
const MongoClient = require('mongodb').MongoClient

var db

MongoClient.connect('mongodb://aryan:[e-mail]:27938/post-quotes', 
                    (err, database) => {
    console.log('inside')
    //We move app.listen() so that it boots up only when our database is connected; ony aftert that should it flag: listening
    if (err) return console.log(err)

    db = database
    app.listen(process.env.PORT || 3000, function()  {
    console.log('listening on 3000')
})
    db.collection('quotes').find().toArray( (err, results) => {
        console.log(results)
    })
})

app.use(bodyParser.urlencoded({extended: true}))
//enabling body parser to handle formms as in our case




app.get('/', (req, res) => {
    res.sendFile('/media/aryan/Adani/zellwk' + '/index.html')
})  // /index.html specifies that index.html is stored in the root of your project directory.

app.post('/quotes', (req, res) => {
    db.collection('quotes').save(req.body, (err, result) =>{    //creating a mongodb Collection called quotes and usiing .save silmultaneously to save it on the mongodb server
        if (err) return console.log(err)

        console.log("Save Successful")
        res.redirect('/')   // Now what after the user presses submit. We need to show him som echanges. So  redirect him to the starting page. 

    })



})

在日志屏幕中，我得到一个错误：

Answer 1

为了将来的参考，我在使用MongoDB（通过mLab）启动一个项目时遇到了这个问题。请记住，您首先要创建一个“数据库用户”，这些凭据将进入您的连接URL:mongoDb:// : @ds11111.mlab.com:11111/your-db-name

dbuser和dbpassword不是您的mLab登录凭据，而是当您成为数据库用户时的凭据。一个我经常忘记的细微差别。