问如何解决邮递员在运行Heroku _ NodeJs _ MongoDB的URL时出现的“未指定名称”错误

EN

var body = require('body-parser');
const mongoose = require('mongoose');
var mongodb = require('mongodb')
var url = 'mongodb://localhost:27017/Mongodb'
var express = require('express');
var app = express();
app.use(body.json());
var bcrypt = require('bcrypt');
var CryptoJS = require("crypto-js")
var jwt = require('jsonwebtoken');
const router= express.Router()
const User = require('./connection');
mongoose.connect('mongodb://localhost:27017/Mongodb', { useUnifiedTopology: true, useNewUrlParser: true },function(err){
  if(err){
    console.log(err)
  }else{
    console.log("connection Successful")
  }
})


// router.get('/Dashboard', (req, res) => {
//   res.send('Hello World')
// })

function checkToken(req,res,result){
  const header= req.headers.token;
  if(typeof header !== 'undefined'){
    const bearer =header.split('.');
    const token = bearer[1]
    //console.log(token)
    req.token = token 
    //next();
    result();
  }else
  res.json("Error")
  }  

const login = require('./routes/login')
app.post("/login", async (req, res, next) => {
  console.log("login api hit")
  login(req,res,next)
  } )  

const userDashboard = require('./routes/userdashboard')
app.post("/Dashboard",checkToken,(req,res)=>  {
  userDashboard(req,res);
}) 

const PORT = process.env.PORT || 5000
  app.listen(PORT, function(){
 
    console.log("Server is running")
    
  })

var body = require('body-parser');
const mongoose = require('mongoose');
var mongodb = require('mongodb')
var url = 'mongodb://localhost:27017/Mongodb'
var express = require('express');
var app = express();
app.use(body.json());
const User = require('../connection');
var bcrypt = require('bcrypt');
var CryptoJS = require("crypto-js")
var jwt = require('jsonwebtoken');

login=(req,res,next)=>{  
  console.log(req.data)
  User.find({"username":req.body.username},function(err,data){
    if(err){
      console.log("unspecified name")
      res.status(400).json("unspecified name")
      return;
    } 
    else{
    console.log(data.length)
         if(data.length<=0)
      {
        res.status(300).json({
          "message":"Invalid Input!"
        })  
      }
      else {
           
        //bcrypt.compare(req.body.password,data[0].password).then(function(result) {
          var bytes = CryptoJS.AES.decrypt(data[0].password, 'my-secret-key@123');
          var decryptedData = JSON.parse(bytes.toString(CryptoJS.enc.Utf8));
          console.log(decryptedData)
            if (req.body.password==decryptedData)
              {
                login = "Succesful";            
                var token = jwt.sign({
                  data: 'foobar'
           }, 'secret', { expiresIn: "2 minute"})
           res.status(200).json({auth: true,  AccessToken:token,  User:data[0]}) 
          }
           else
           {res.status(300).json({
            "message":"Input!"
          })}
          
          //  });
          
        }}
      })
}
module.exports = login;

2021-05-25T11:04:30.507933+00:00 app[web.1]: Server is running
2021-05-25T11:04:30.682233+00:00 heroku[web.1]: State changed from starting to up
2021-05-25T11:05:00.561298+00:00 app[web.1]: MongooseServerSelectionError: Could not connect to any servers in your MongoDB Atlas cluster. One common reason is that you're trying to access the database from an IP that isn't whitelisted. Make sure your current IP address is on your Atlas cluster's IP whitelist: https://docs.atlas.mongodb.com/security-whitelist/
2021-05-25T11:05:00.561320+00:00 app[web.1]: at NativeConnection.Connection.openUri (/app/node_modules/mongoose/lib/connection.js:832:32)
2021-05-25T11:05:00.561321+00:00 app[web.1]: at /app/node_modules/mongoose/lib/index.js:345:10
2021-05-25T11:05:00.561335+00:00 app[web.1]: at promiseOrCallback (/app/node_modules/mongoose/lib/helpers/promiseOrCallback.js:9:12)
2021-05-25T11:05:00.561341+00:00 app[web.1]: at Mongoose._promiseOrCallback (/app/node_modules/mongoose/lib/index.js:1135:10)
2021-05-25T11:05:00.561342+00:00 app[web.1]: at Mongoose.connect (/app/node_modules/mongoose/lib/index.js:344:20)
2021-05-25T11:05:00.561343+00:00 app[web.1]: at Object.<anonymous> (/app/app.js:13:10)
2021-05-25T11:05:00.561343+00:00 app[web.1]: at Module._compile (internal/modules/cjs/loader.js:1068:30)
2021-05-25T11:05:00.561344+00:00 app[web.1]: at Object.Module._extensions..js (internal/modules/cjs/loader.js:1097:10)
2021-05-25T11:05:00.561344+00:00 app[web.1]: at Module.load (internal/modules/cjs/loader.js:933:32)
2021-05-25T11:05:00.561344+00:00 app[web.1]: at Function.Module._load (internal/modules/cjs/loader.js:774:14)
2021-05-25T11:05:00.561345+00:00 app[web.1]: at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
2021-05-25T11:05:00.561345+00:00 app[web.1]: at internal/main/run_main_module.js:17:47 {
2021-05-25T11:05:00.561346+00:00 app[web.1]: reason: TopologyDescription {
2021-05-25T11:05:00.561346+00:00 app[web.1]: type: 'ReplicaSetNoPrimary',
2021-05-25T11:05:00.561346+00:00 app[web.1]: setName: null,
2021-05-25T11:05:00.561347+00:00 app[web.1]: maxSetVersion: null,
2021-05-25T11:05:00.561347+00:00 app[web.1]: maxElectionId: null,
2021-05-25T11:05:00.561348+00:00 app[web.1]: servers: Map(3) {
2021-05-25T11:05:00.561348+00:00 app[web.1]: 'cluster0-shard-00-02.ocarv.mongodb.net:27017' => [ServerDescription],
2021-05-25T11:05:00.561348+00:00 app[web.1]: 'cluster0-shard-00-00.ocarv.mongodb.net:27017' => [ServerDescription],
2021-05-25T11:05:00.561349+00:00 app[web.1]: 'cluster0-shard-00-01.ocarv.mongodb.net:27017' => [ServerDescription]
2021-05-25T11:05:00.561350+00:00 app[web.1]: },
2021-05-25T11:05:00.561350+00:00 app[web.1]: stale: false,
2021-05-25T11:05:00.561350+00:00 app[web.1]: compatible: true,
2021-05-25T11:05:00.561350+00:00 app[web.1]: compatibilityError: null,
2021-05-25T11:05:00.561351+00:00 app[web.1]: logicalSessionTimeoutMinutes: null,
2021-05-25T11:05:00.561351+00:00 app[web.1]: heartbeatFrequencyMS: 10000,
2021-05-25T11:05:00.561351+00:00 app[web.1]: localThresholdMS: 15,
2021-05-25T11:05:00.561352+00:00 app[web.1]: commonWireVersion: null
2021-05-25T11:05:00.561352+00:00 app[web.1]: }
2021-05-25T11:05:00.561352+00:00 app[web.1]: }
2021-05-25T11:15:57.214740+00:00 app[web.1]: login api hit
2021-05-25T11:15:57.215001+00:00 app[web.1]: {}
2021-05-25T11:16:07.230564+00:00 app[web.1]: unspecified name
2021-05-25T11:16:07.247306+00:00 app[web.1]: /app/node_modules/mongoose/lib/helpers/promiseOrCallback.js:19
2021-05-25T11:16:07.247307+00:00 app[web.1]: throw error;
2021-05-25T11:16:07.247308+00:00 app[web.1]: ^
2021-05-25T11:16:07.247308+00:00 app[web.1]:
2021-05-25T11:16:07.247309+00:00 app[web.1]: ReferenceError: print is not defined
2021-05-25T11:16:07.247310+00:00 app[web.1]: at /app/routes/login.js:19:7
2021-05-25T11:16:07.247310+00:00 app[web.1]: at /app/node_modules/mongoose/lib/model.js:4863:16
2021-05-25T11:16:07.247310+00:00 app[web.1]: at /app/node_modules/mongoose/lib/model.js:4863:16
2021-05-25T11:16:07.247311+00:00 app[web.1]: at /app/node_modules/mongoose/lib/helpers/promiseOrCallback.js:16:11
2021-05-25T11:16:07.247311+00:00 app[web.1]: at /app/node_modules/mongoose/lib/model.js:4886:21
2021-05-25T11:16:07.247312+00:00 app[web.1]: at /app/node_modules/mongoose/lib/query.js:4389:18
2021-05-25T11:16:07.247312+00:00 app[web.1]: at /app/node_modules/mongoose/lib/query.js:4424:14
2021-05-25T11:16:07.247313+00:00 app[web.1]: at cb (/app/node_modules/mongoose/lib/query.js:1895:14)
2021-05-25T11:16:07.247313+00:00 app[web.1]: at /app/node_modules/mquery/lib/collection/node.js:27:21
2021-05-25T11:16:07.247314+00:00 app[web.1]: at collectionOperationCallback (/app/node_modules/mongoose/lib/drivers/node-mongodb-native/collection.js:160:26)
2021-05-25T11:16:07.247323+00:00 app[web.1]: at Timeout.<anonymous> (/app/node_modules/mongoose/lib/drivers/node-mongodb-native/collection.js:185:11)
2021-05-25T11:16:07.247323+00:00 app[web.1]: at listOnTimeout (internal/timers.js:555:17)
2021-05-25T11:16:07.247324+00:00 app[web.1]: at processTimers (internal/timers.js:498:7)
2021-05-25T11:16:07.247324+00:00 app[web.1]: Emitted 'error' event on Function instance at:
2021-05-25T11:16:07.247324+00:00 app[web.1]: at /app/node_modules/mongoose/lib/model.js:4865:13
2021-05-25T11:16:07.247325+00:00 app[web.1]: at /app/node_modules/mongoose/lib/helpers/promiseOrCallback.js:16:11
2021-05-25T11:16:07.247325+00:00 app[web.1]: [... lines matching original stack trace ...]
2021-05-25T11:16:07.247326+00:00 app[web.1]: at processTimers (internal/timers.js:498:7)
2021-05-25T11:16:07.314225+00:00 heroku[web.1]: Process exited with status 1
2021-05-25T11:16:07.401592+00:00 heroku[web.1]: State changed from up to crashed
2021-05-25T11:16:07.409072+00:00 heroku[web.1]: State changed from crashed to starting
2021-05-25T11:16:07.240945+00:00 heroku[router]: at=info method=POST path="/login" host=attendance-demo.herokuapp.com request_id=ac9410a0-ac64-420b-b4d5-803aaa1a3fb2 fwd="111.88.134.32" dyno=web.1 connect=1ms service=10035ms status=400 bytes=234 protocol=https
2021-05-25T11:16:18.897092+00:00 heroku[web.1]: Starting process with command `node app`
2021-05-25T11:16:30.471917+00:00 heroku[web.1]: State changed from starting to up
2021-05-25T11:16:30.423428+00:00 app[web.1]: Server is running

import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
class AuthService{
  Dio dio=new Dio();

  login(name,password)async{
    try{
      return await dio.post('https://attendance-demo.herokuapp.com/login',data: {
        "username":name,
        "password":password
      },options: Options(contentType:Headers.formUrlEncodedContentType)
      );
    }
    on DioError catch(e){
      Fluttertoast.showToast(msg: e.response.data['msg'],
      toastLength: Toast.LENGTH_SHORT,
      gravity: ToastGravity.BOTTOM,
      backgroundColor: Colors.red,
      textColor: Colors.white,
      fontSize: 16.0
      );
    }

  }
}

  RoundedButton(text:"Login",  press: () {
                     AuthService().login(name,password).then((value){
                       if(value.data['success']){
                         token=value.data['token'];
                         Fluttertoast.showToast(msg: 'Authenticated',
                         toastLength: Toast.LENGTH_SHORT,
                        gravity: ToastGravity.BOTTOM,
                        backgroundColor: Colors.red,
                        textColor: Colors.white,
                        fontSize: 16.0);
                         
                       }