URL格式错误，无法解析

Question

以下是捕获的错误：

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这是我的编码文件：

服务器文件

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密钥文件

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我只是使用mongodb、节点和reactjs创建到mlab的连接。我正在使用mongo版本4。

需要你们的帮助伙计们。

[nodemon] starting `node server.js`
Error: URL malformed, cannot be parsed
    at module.exports (C:\MERNapps\TestMERN08\node_modules\mongodb\lib\url_parser.js:17:21)
    at deprecated (internal/util.js:47:15)
    at connect (C:\MERNapps\TestMERN08\node_modules\mongodb\lib\operations\mongo_client_ops.js:179:3)
    at connectOp (C:\MERNapps\TestMERN08\node_modules\mongodb\lib\operations\mongo_client_ops.js:283:3)
    at executeOperation (C:\MERNapps\TestMERN08\node_modules\mongodb\lib\utils.js:420:24)
    at MongoClient.connect (C:\MERNapps\TestMERN08\node_modules\mongodb\lib\mongo_client.js:168:10)
    at Promise (C:\MERNapps\TestMERN08\node_modules\mongoose\lib\connection.js:493:12)
    at new Promise (<anonymous>)
    at NativeConnection.Connection.openUri (C:\MERNapps\TestMERN08\node_modules\mongoose\lib\connection.js:490:19)
    at Mongoose.connect (C:\MERNapps\TestMERN08\node_modules\mongoose\lib\index.js:230:15)
    at Object.<anonymous> (C:\MERNapps\TestMERN08\server.js:12:2)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
(node:3696) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.
server running on port 5000

Answer 1

问题是你的钥匙。试着使用：

module.exports= {
  mongoURI : "your-uri-string",
  options:{key:value}
}

并将钥匙用作：

mongoose.connect(db.mongoURI,options);

Answer 2

一个非常常见的错误与MongoDB地图集。最好还是遵循这个程序

1. 安装Mongo指南针
2. 使用默认设置

主机名: localhost & port 27017

1. 创建一个具有项目名称的数据库，然后收集: user
2. 在条目js上连接下面的代码。路由

mongoose.connect('mongodb://localhost/projectname') .then(() => console.log('mongo db working')) .catch(err => console.log('ERROR is'，err))