Node.js npm start使用MongoDB和mongoose抛出ELIFECYCLE错误

我一直在遵循关于设置MongoDB服务器的指南。然而，我突然无法通过npm start启动localhost:3000。它加载后，运行大约5-10秒，然后我得到一个错误代码ELIFECYCLE。我尝试了其他人提到的每一个步骤，npm cache clean--force，npm install，删除package-lock.json文件，npm install after，删除节点模块。似乎没有什么能解决我的问题

这是我得到的调试日志：

0 info it worked if it ends with ok
1 verbose cli [
1 verbose cli   'D:\\NodeJS\\node.exe',
1 verbose cli   'C:\\Users\\musta\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js',
1 verbose cli   'start'
1 verbose cli ]
2 info using npm@6.14.4
3 info using node@v12.16.1
4 verbose run-script [ 'prestart', 'start', 'poststart' ]
5 info lifecycle shopping-cart@0.0.0~prestart: shopping-cart@0.0.0
6 info lifecycle shopping-cart@0.0.0~start: shopping-cart@0.0.0
7 verbose lifecycle shopping-cart@0.0.0~start: unsafe-perm in lifecycle true
8 verbose lifecycle shopping-cart@0.0.0~start: PATH: C:\Users\musta\AppData\Roaming\npm\node_modules\npm\node_modules\npm-lifecycle\node-gyp-bin;D:\Other\Projects\Code\Powershell\shopping-cart\node_modules\.bin;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\iCLS\;C:\Program Files\Intel\Intel(R) Management Engine Components\iCLS\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\dotnet\;C:\Program Files\NVIDIA Corporation\NVIDIA NvDLISR;D:\NodeJS\;C:\Users\musta\AppData\Local\Microsoft\WindowsApps;C:\Users\musta\AppData\Roaming\npm
9 verbose lifecycle shopping-cart@0.0.0~start: CWD: D:\Other\Projects\Code\Powershell\shopping-cart
10 silly lifecycle shopping-cart@0.0.0~start: Args: [ '/d /s /c', 'node ./bin/www' ]
11 silly lifecycle shopping-cart@0.0.0~start: Returned: code: 1  signal: null
12 info lifecycle shopping-cart@0.0.0~start: Failed to exec start script
13 verbose stack Error: shopping-cart@0.0.0 start: `node ./bin/www`
13 verbose stack Exit status 1
13 verbose stack     at EventEmitter.<anonymous> (C:\Users\musta\AppData\Roaming\npm\node_modules\npm\node_modules\npm-lifecycle\index.js:332:16)
13 verbose stack     at EventEmitter.emit (events.js:311:20)
13 verbose stack     at ChildProcess.<anonymous> (C:\Users\musta\AppData\Roaming\npm\node_modules\npm\node_modules\npm-lifecycle\lib\spawn.js:55:14)
13 verbose stack     at ChildProcess.emit (events.js:311:20)
13 verbose stack     at maybeClose (internal/child_process.js:1021:16)
13 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:286:5)
14 verbose pkgid shopping-cart@0.0.0
15 verbose cwd D:\Other\Projects\Code\Powershell\shopping-cart
16 verbose Windows_NT 10.0.18363
17 verbose argv "D:\\NodeJS\\node.exe" "C:\\Users\\musta\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "start"
18 verbose node v12.16.1
19 verbose npm  v6.14.4
20 error code ELIFECYCLE
21 error errno 1
22 error shopping-cart@0.0.0 start: `node ./bin/www`
22 error Exit status 1
23 error Failed at the shopping-cart@0.0.0 start script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 1, true ]

这些问题是否相关？我已经搜索了github和stackoverflow以及youtube指南上的评论，但似乎找不到问题所在

---

任何帮助都将不胜感激，谢谢

因此，对于第二个问题，您只需要在根文件中安装一个

middleware

依赖项

body解析器

，然后添加以下代码

//Middlewares for bodyParser
app.use(bodyParser.urlencoded({extended: false}));
app.use(bodyParser.json());

---

当您向MongoDB引入查询时，似乎出现了错误。确保数据库已启动并准备就绪。@AlexisPavlidis当我启动mongoDB服务器（./mongod）时，它现在似乎没有关闭本地主机，我觉得这很奇怪，因为它以前不需要它，但感谢您指出这一点。现在，我尝试使用npm start，它是我在调试日志下发布的index.js文件的第一个代码段，并收到一条新消息：throw new TypeError（'Router.use（）需要一个中间件函数，但得到了一个'+gettype（fn））^TypeError:Router.use（）需要一个中间件函数，但得到了一个对象。我要添加整个代码段吗？来自/中间商？在哪个文件里？我猜app.js文件是对的？添加了它，这就是我得到的

app.use（bodyParser.urlencoded（{extended:false}））；^ReferenceError:bodyParser未定义

install

npm i body parser

并且在您的

app.js

文件中将其导入为

const bodyParser=require（'body-parser'）和上面的代码修复了它，我忘记或删除了“module.exports=router；”在页面底部，感谢大家的帮助！你能在问题中发布你的
app.js
文件吗？好的！！
var express = require('express');
var router = express.Router();
var Product = require('D:/Other/Projects/Code/Powershell/shopping-cart/models/product');

/* GET home page. */
router.get('/', function(req, res, next) {
  var products = Product.find();
  res.render('shop/index.hbs', { title: 'Shopping Cart', products });
});


module.exports = router;

//Middlewares for bodyParser
app.use(bodyParser.urlencoded({extended: false}));
app.use(bodyParser.json());