对于mongoose和cloud mongodb，Nodejs数据库都会失败，并显示"No valid exports main for `...\node_modules\mongodb-connection-string-url“

Question

在一个简单的node.js应用中，我既无法连接到本地mongoose数据库，也无法连接到云mongoDB数据库。

下面是错误：

Error: No valid exports main found for 'D:\Documents\code\node-api\node_modules\mongodb-connec
tion-string-url'
←[90m    at resolveExportsTarget (internal/modules/cjs/loader.js:625:9)←[39m
←[90m    at applyExports (internal/modules/cjs/loader.js:502:14)←[39m
←[90m    at resolveExports (internal/modules/cjs/loader.js:551:12)←[39m
←[90m    at Function.Module._findPath (internal/modules/cjs/loader.js:657:22)←[3
9m
←[90m    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:960
:27)←[39m
←[90m    at Function.Module._load (internal/modules/cjs/loader.js:855:27)←[39m
←[90m    at Module.require (internal/modules/cjs/loader.js:1033:19)←[39m
←[90m    at require (internal/modules/cjs/helpers.js:72:18)←[39m
    at Object.<anonymous> (D:\Documents\code\node-api\node_modules\←[4mmongodb←[24m\lib\connec
tion_string.js:6:41)
←[90m    at Module._compile (internal/modules/cjs/loader.js:1144:30)←[39m {
  code: ←[32m'MODULE_NOT_FOUND'←[39m
}
[nodemon] app crashed - waiting for file changes before starting...

下面是两个代码片段，它们都会产生错误: local：

const mongoose = require('mongoose');

module.exports = async () => {
    try{
        await mongoose.connect(process.env.DB_URL, {useNewUrlParser: true});
        console.log("Database connected");
    }catch(error)
    {
        console.log("error: ", error);
        throw new Error(error);
    }
   
}

和云：

const { MongoClient } = require('mongodb');
const uri = "mongodb+srv://user1:<[mypasswordgoeshere]>@cluster0.vl2la.mongodb.net/myFirstDatabase?retryWrites=true&w=majority";
const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true });
client.connect(err => {
  const collection = client.db("test").collection("devices");
  // perform actions on the collection object
  client.close();
});

这里有许多类似错误的问题，我已经尽可能多地遵循了这些步骤，包括重新安装软件包，删除node_modules并重新安装，安装自动修复程序，以及降级各种软件包的版本。需要注意的是，我使用的是Windows7，因此无法进一步更新我的node.js版本。

这是我的packages.json文件：

{
  "name": "node-api",
  "version": "1.0.0",
  "description": "",
  "main": "server.js",
  "scripts": {
    "start": "node server.js",
    "dev": "nodemon server.js"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "autoprefixer": "^9.8.0",
    "cors": "^2.8.5",
    "dotenv": "^10.0.0",
    "express": "^4.17.1",
    "mongoose": "^6.0.8"
  },
  "devDependencies": {
    "nodemon": "^2.0.13"
  }
}

Answer 1

由于某些原因，在Node.js终端中启动服务器会产生此错误。在Windows7 cmd中执行所有操作都可以完美工作，而不会出现此错误。

Answer 2

我在mongo-connection-string-url包中也遇到了同样的问题。正在运行节点13.3.0，升级到14.17.5解决了此问题。