猫鼬(Node.js)，无法连接到 [本地主机:27017]

Question

我正在尝试启动服务器，但出现错误：

Error: failed to connect to [localhost:27017]
    at null.<anonymous> (C:nodeprojectnode_modulesmongoosenode_modulesmong
odblibmongodbconnectionserver.js:549:74)
    at emit (events.js:106:17)
    at null.<anonymous> (C:nodeprojectnode_modulesmongoosenode_modulesmong
odblibmongodbconnectionconnection_pool.js:150:15)
    at emit (events.js:98:17)
    at Socket.<anonymous> (C:nodeprojectnode_modulesmongoosenode_modulesmo
ngodblibmongodbconnectionconnection.js:533:10)
    at Socket.emit (events.js:95:17)
    at net.js:440:14
    at process._tickCallback (node.js:419:13)

这是我的代码：

var debug = require('debug')('project');
var app = require('../app');
app.set('port', process.env.PORT || 3000);
var server = app.listen(app.get('port'), function() {
  debug('Express server listening on port ' + server.address().port);
});

当我使用"npm start"时 - 服务器正在启动一秒钟，但实际上它正在下降。

Answer 1

确保通过从命令行运行mongod来启动服务器。