MongoDB 셋팅하기 (무료 호스팅도 받아보자) // 연결 오류

[유근형]

위 강의 듣던 중 작성하여주신 것 동일하게 복사 후 아래와 같이url 부분의 아이디와 패스워드를 제 꺼로 바꿨습니다.

const express = require('express')
const bodyParser= require('body-parser')
app.use(bodyParser.urlencoded({extended: true}))
const app = express()
const MongoClient = require('mongodb').MongoClient

MongoClient.connect('mongodb+srv://keunbro:q1w2e3r4@cluster0.ivrtx.mongodb.net/myFirstDatabase?retryWrites=true&w=majority', function(에러, client){
  if (에러) return console.log(에러)
  app.listen(8080, function() {
    console.log('listening on 8080')
  })
})

정말 똑같이 복사했는데 터미널 창에 nodemon server.js (파일이름도 동일하게 server.js입니다)치니까

아래와 같은 메세지가 뜹니다

 

[nodemon] restarting due to changes...
[nodemon] starting node server.js
C:\Users\user\Desktop\Newnode\server.js:3
app.use(bodyParser.urlencoded({extended: true}))
^

ReferenceError: Cannot access 'app' before initialization
at Object.<anonymous> (C:\Users\user\Desktop\Newnode\server.js:3:1)
at Module._compile (node:internal/modules/cjs/loader:1108:14)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1137:10)
at Module.load (node:internal/modules/cjs/loader:973:32)
at Function.Module._load (node:internal/modules/cjs/loader:813:14)
at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:76:12)
at node:internal/main/run_main_module:17:47
[nodemon] app crashed - waiting for file changes before starting...

 

 

혹시나해서 

app.use(bodyParser.urlencoded({extended: true})) 이것을

app.use(express.urlencoded({extended: true})) 로 바꾸어보고 실행시켜보니

아래와 같이 메세지가 뜨네요

 

[nodemon] restarting due to changes...
[nodemon] starting node server.js
C:\Users\user\Desktop\Newnode\server.js:3
app.use(express.urlencoded({extended: true}))
^

ReferenceError: Cannot access 'app' before initialization
at Object.<anonymous> (C:\Users\user\Desktop\Newnode\server.js:3:1)
at Module._compile (node:internal/modules/cjs/loader:1108:14)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1137:10)
at Module.load (node:internal/modules/cjs/loader:973:32)
at Function.Module._load (node:internal/modules/cjs/loader:813:14)
at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:76:12)
at node:internal/main/run_main_module:17:47
[nodemon] app crashed - waiting for file changes before starting...

 

 

어떻게 해결해야할까요? ㅠㅠ

[유근형]

아래 게시글을 참고하여 const app = express() 과
app.use(express.urlencoded({extended: true}))의 순서를 바꿔본 후 실행하였는데,

아래와 같은 또다른 오류에 직면했습니다;; 이게 왜그런것일까요??

 

[nodemon] restarting due to changes...
[nodemon] starting node server.js
(node:10544) [MONGODB DRIVER] Warning: Current Server Discovery and Monitoring engine is deprecated, and will be removed in a future
version. To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to the MongoClient constructor.
(Use node --trace-warnings ... to show where the warning was created)
MongoNetworkError: failed to connect to server [cluster0-shard-00-00.ivrtx.mongodb.net:27017] on first connect [MongoError: Authentication failed.
at Connection.messageHandler (C:\Users\user\Desktop\Newnode\node_modules\mongodb\lib\core\connection\connection.js:359:19)
at Connection.emit (node:events:378:20)
at processMessage (C:\Users\user\Desktop\Newnode\node_modules\mongodb\lib\core\connection\connection.js:451:10)
at TLSSocket.<anonymous> (C:\Users\user\Desktop\Newnode\node_modules\mongodb\lib\core\connection\connection.js:620:15)
at TLSSocket.emit (node:events:378:20)
at addChunk (node:internal/streams/readable:313:12)
at readableAddChunk (node:internal/streams/readable:288:9)
at TLSSocket.Readable.push (node:internal/streams/readable:227:10)
at TLSWrap.onStreamRead (node:internal/stream_base_commons:190:23) {
ok: 0,
code: 8000,
codeName: 'AtlasError'
}]
at Pool.<anonymous> (C:\Users\user\Desktop\Newnode\node_modules\mongodb\lib\core\topologies\server.js:438:11)
at Pool.emit (node:events:378:20)
at C:\Users\user\Desktop\Newnode\node_modules\mongodb\lib\core\connection\pool.js:562:14
at C:\Users\user\Desktop\Newnode\node_modules\mongodb\lib\core\connection\pool.js:1009:9
at callback (C:\Users\user\Desktop\Newnode\node_modules\mongodb\lib\core\connection\connect.js:75:5)
at C:\Users\user\Desktop\Newnode\node_modules\mongodb\lib\core\connection\connect.js:147:27
at C:\Users\user\Desktop\Newnode\node_modules\mongodb\lib\core\auth\scram.js:109:14
at _callback (C:\Users\user\Desktop\Newnode\node_modules\mongodb\lib\core\connection\connection.js:328:7)
at Connection.messageHandler (C:\Users\user\Desktop\Newnode\node_modules\mongodb\lib\core\connection\connection.js:359:9)
at Connection.emit (node:events:378:20)
[nodemon] clean exit - waiting for changes before restart
 

[codingapple]

mongodb atlas에서 connect 버튼 누르면 뜨는 그 url을 잘 복사해서 다시 채워넣어봅시다

+ 그리고 db 접속용 아이디와 비번도 다시 확인하고 채워넣읍시다 

[유근형]

아 제대로 작동됐습니다. 무엇이 문제였는지 모르겠지만 ㅎㅎ;;;

 

감사합니다.

[codingapple]

아마 제 url 그대로 복붙하신듯요? 사람마다 접속 url이 다릅니다 

[글쓴이]

글