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我是一名使用 node.js 测试 mongodb 的大三学生，在我的代码中，我尝试使用 mongoose 连接到 mongodb，但由于某种原因，我的 mongoose 无法连接到数据库，我检查了以下内容：

mongodb 实际安装，我通过 brew 和 mongod 安装 mongodb，mongo 作品 mongoose 在我的目录中

以下是我的错误，任何帮助将不胜感激

Express server listening on port 3000

/path/1_mongodb/connect_to_mongo/app.js:17
    throw err;
          ^
Error: failed to connect to [localhost:27017]
    at null.<anonymous>     (path/1_mongodb/connect_to_mongo/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/server.js:636:74)
at EventEmitter.emit (events.js:106:17)
at null.<anonymous> (/path/1_mongodb/connect_to_mongo/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/connection_pool.js:139:15)
at EventEmitter.emit (events.js:98:17)
at Socket.<anonymous> (/path/1_mongodb/connect_to_mongo/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/connection.js:476:10)
at Socket.EventEmitter.emit (events.js:95:17)
at net.js:426:14
at process._tickCallback (node.js:415:13)

应用程序.js

var express = require('express'),
    routes = require('./routes'),
    mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/todo_development')
var Schema = mongoose.Schema;
var ObjectId = Schema.ObjectId;

var Task = new Schema({
  task: String
});

var Task = mongoose.model('Task', Task);

var app = module.exports = express.createServer();

// Configuration

app.configure(function(){
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use(express.bodyParser());
  app.use(express.methodOverride());
  app.use(app.router);
  app.use(express.static(__dirname + '/public'));
});

app.configure('development', function(){
  app.use(express.errorHandler({ dumpExceptions: true, showStack: true })); 
});

app.configure('production', function(){
  app.use(express.errorHandler()); 
});

// Routes

app.get('/', routes.index);

app.listen(3000);
console.log("Express server listening on port %d in %s mode", app.address().port,       app.settings.env);

编辑：所以我意识到在尝试使用 node.js 访问 mongodb 时，您应该首先运行 mongod。

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