我的 express 应用程序中的 mongoose.connect 名称为 : MongoParserError , 消息: 'URI malformed, cannot be parsed'

Question

mongoose
    .connect(db,{ useNewUrlParser: true}) 
    .then(() => console.log("MongoDB conected ..."))
    .catch(err => console.log(err));

上面提到的是我的代码，其中'db'是mLab提供的我的数据库URI

当我编写运行快速代码时，它会捕获错误并给出特定的错误消息:

URI malformed, cannot be parsed

{ MongoError: URI malformed, cannot be parsed
    at parseConnectionString (/Users/dibs/Desktop/mern-ex/node_modules/mongodb-core/lib/uri_parser.js:207:21)
    at connect (/Users/dibs/Desktop/mern-ex/node_modules/mongodb/lib/operations/mongo_client_ops.js:179:3)
    at connectOp (/Users/dibs/Desktop/mern-ex/node_modules/mongodb/lib/operations/mongo_client_ops.js:283:3)
    at executeOperation (/Users/dibs/Desktop/mern-ex/node_modules/mongodb/lib/utils.js:420:24)
    at MongoClient.connect (/Users/dibs/Desktop/mern-ex/node_modules/mongodb/lib/mongo_client.js:168:10)
    at Promise (/Users/dibs/Desktop/mern-ex/node_modules/mongoose/lib/connection.js:487:12)
    at Promise (<anonymous>)
    at NativeConnection.Connection.openUri (/Users/dibs/Desktop/mern-ex/node_modules/mongoose/lib/connection.js:484:19)
    at Mongoose.connect (/Users/dibs/Desktop/mern-ex/node_modules/mongoose/lib/index.js:229:15)
    at Object.<anonymous> (/Users/dibs/Desktop/mern-ex/server.js:20:6)
    at Module._compile (module.js:569:30)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:503:32)
    at tryModuleLoad (module.js:466:12)
    at Function.Module._load (module.js:458:3)
    at Function.Module.runMain (module.js:605:10)
  name: 'MongoParseError',
  message: 'URI malformed, cannot be parsed',
  [Symbol(mongoErrorContextSymbol)]: {} }

Answer 1

我有一些问题。
请检查，您的 uri 不是 undefined您可以使用 console.log(db)