Node.js 我能'；似乎无法启动nodeJS服务

我正在尝试启动一项服务：

c:\MongoUni\Ex3\chapter3>node index.js
express-session deprecated undefined resave option; provide resave option auth.js:48:37
express-session deprecated undefined saveUninitialized option; provide saveUninitialized option auth.js:48:37
Listening on port 3000!

我得到这个错误

c:\MongoUni\Ex3\chapter3\node_modules\mongodb\lib\server.js:228
        process.nextTick(function() { throw err; })
                                      ^
Error: connect ECONNREFUSED 127.0.0.1:27017
    at Object.exports._errnoException (util.js:1022:11)
    at exports._exceptionWithHostPort (util.js:1045:20)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1087:14)

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看起来您的应用程序正在尝试连接端口27017的mongodb，但您的计算机上没有运行mongodb。下面是如何在Windows上安装它的说明（我猜您是根据文件路径运行的）

thx，只需运行：c:\Program Files\MongoDB\Server\3.4\bin>mongod