Question

我尝试将Mongoose与我的Node.js连接，但它总是显示此错误。我正在关注this教程来创建一个身份验证系统。编写server.js文件并尝试修复routes.js中的问题后，我收到错误，我不知道原因，请帮助。

以下是我的代码和错误：

server.js

＆＃13;

// server.js

// set up ======================================================================
// get all the tools we need
var express  = require('express');
var app      = express();
var port     = process.env.PORT || 8080;
var mongoose = require('mongoose');
var passport = require('passport');
var flash    = require('connect-flash');

var morgan       = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser   = require('body-parser');
var session      = require('express-session');

var configDB = require('./config/database.js');

// configuration ===============================================================
mongoose.connect(configDB.url); // connect to our database

// require('./config/passport')(passport); // pass passport for configuration

// set up our express application
app.use(morgan('dev')); // log every request to the console
app.use(cookieParser()); // read cookies (needed for auth)
app.use(bodyParser()); // get information from html forms

app.set('view engine', 'ejs'); // set up ejs for templating

// required for passport
app.use(session({ secret: 'ilovescotchscotchyscotchscotch' })); // session secret
app.use(passport.initialize());
app.use(passport.session()); // persistent login sessions
app.use(flash()); // use connect-flash for flash messages stored in session

// routes ======================================================================
require('./app/routes.js')(app, passport); // load our routes and pass in our app and fully configured passport

// launch ======================================================================
app.listen(port);
console.log('The magic happens on port ' + port);

＆＃13;

routes.js：

＆＃13;

module.exports = function(app, passport) {
    //...
};

＆＃13;

的package.json

＆＃13;

{
  "name": "node-authentication",
  "main": "server.js",
  "dependencies" : {
    "express" : "~4.0.0",
    "ejs" : "~0.8.5",
    "mongoose" : "~3.8.1",
    "passport" : "~0.1.17",
    "passport-local" : "~0.1.6",
    "passport-facebook" : "~1.0.2",
    "passport-twitter" : "~1.0.2",
    "passport-google-oauth" : "~0.1.5",
    "connect-flash" : "~0.1.1",
    "bcrypt-nodejs" : "latest",

    "morgan": "~1.0.0",
    "body-parser": "~1.0.0",
    "cookie-parser": "~1.0.0",
    "method-override": "~1.0.0",
    "express-session": "~1.0.0"
  }
}

＆＃13;

＆＃13; 的 database.js

＆＃13;

// config/database.js
module.exports = {

    'url' : 'your-settings-here' // looks like mongodb://<user>:<pass>@mongo.onmodulus.net:27017/Mikha4ot

};

＆＃13;

错误

＆＃13;

The magic happens on port 8080
events.js:141
      throw er; // Unhandled 'error' event
      ^

Error: failed to connect to [undefined:27017]
    at null.<anonymous> (/Applications/XAMPP/xamppfiles/htdocs/ouestcharlie/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/server.js:556:25)
    at emitThree (events.js:97:13)
    at emit (events.js:175:7)
    at null.<anonymous> (/Applications/XAMPP/xamppfiles/htdocs/ouestcharlie/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/connection_pool.js:156:15)
    at emitTwo (events.js:87:13)
    at emit (events.js:172:7)
    at Socket.<anonymous> (/Applications/XAMPP/xamppfiles/htdocs/ouestcharlie/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/connection.js:534:10)
    at emitOne (events.js:77:13)
    at Socket.emit (events.js:169:7)
    at connectErrorNT (net.js:996:8)
    at nextTickCallbackWith2Args (node.js:442:9)
    at process._tickCallback (node.js:356:17)

＆＃13;

Answer 1

Mongoose.connect（）需要格式为

的参数

"mongodb://<hostname>/<databasename>"

相反，它已经在您的database.js中配置了以下内容：

"your-settings-here"

我猜这是错的。只需在database.js中填写一个不错的连接URL，例如：＆＃34; mongodb：// localhost / my-test-db＆＃34; （请使用正确的值替换），此错误将消失。

Answer 2

这是连接默认端口（27017）上本地运行的myapp数据库所需的最低要求。如果本地连接失败，请尝试使用127.0.0.1而不是localhost。有时在更改本地主机名时可能会出现问题。 [来源：http://mongoosejs.com/docs/connections.html]

我有同样的错误。我重新安装了mongoDB，但它没有用。

我通过使用以下网址连接到localhost解决了我的问题。 mongoose.connect('mongodb://127.0.0.1:27017/database-name');

无法将Mongodb连接到Node.js：throw er; //未处理的错误＆＃39;事件^错误：无法连接到[undefined：27017]

2 个答案: