node.js 和 express 应用程序中未处理的错误事件答案

【问题标题】：Unhandled error event in node.js and express appnode.js 和 express 应用程序中未处理的错误事件
【发布时间】：2015-01-08 09:30:58
【问题描述】：

我正在关注this blog上关于“使用 PassportJS 进行身份验证”的本教程

并从他的仓库https://github.com/DanialK/PassportJS-Authentication 下载了文件。我安装了终端指示我安装的包裹。然后我尝试再次运行该应用程序但得到了这个

connect.multipart() will be removed in connect 3.0
visit https://github.com/senchalabs/connect/wiki/Connect-3.0 for alternatives
connect.limit() will be removed in connect 3.0
Express server listening on port 3000

events.js:66
        throw arguments[1]; // Unhandled 'error' event
                       ^
Error: failed to connect to [localhost:27017]
    at Server.connect.connectionPool.on.server._serverState (/Users/juangallardo/Desktop/PassportJS-Authentication-master/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/server.js:540:74)
    at EventEmitter.emit (events.js:115:20)
    at connection.on._self._poolState (/Users/juangallardo/Desktop/PassportJS-Authentication-master/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/connection_pool.js:140:15)
    at EventEmitter.emit (events.js:91:17)
    at Socket.errorHandler (/Users/juangallardo/Desktop/PassportJS-Authentication-master/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/connection.js:478:10)
    at Socket.EventEmitter.emit (events.js:88:17)
    at Socket._destroy.self.errorEmitted (net.js:335:14)
    at process.startup.processNextTick.process._tickCallback (node.js:244:9)

【问题讨论】：

标签： node.js express passport.js

【解决方案1】：

问题是我没有运行 MongoDB

我发现了那个“问题”discussed on GitHub

然后从this tutorial得到安装和运行mongo的说明

brew install mongodb

然后你只需从终端启动 mongo 服务器

mongod

然后回到您的项目，只需使用

启动应用程序

node app.js

【讨论】：