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감사합니다!!

bcrypt 문제 인데요  bcryptjs를 설치해주시면 됩니다 

npm  install bcryptjs   해서 설치해주시고 

const bcrypt = require('bcrypt') 이 부분을 

const bcrypt = require('bcryptjs') 이렇게 바꾸어주세요  ~ !

(base) hayden@iseunghyeon-ui-MacBookPro server % npm run dev

> react-boiler-plate@1.0.0 dev /Users/hayden/Desktop/react_inflearn/boilerplate-mern-stack-master

> concurrently "npm run backend" "npm run start --prefix client"

[1] 

[1] > client@0.1.0 start /Users/hayden/Desktop/react_inflearn/boilerplate-mern-stack-master/client

[1] > react-scripts start

[1] 

[0] 

[0] > react-boiler-plate@1.0.0 backend /Users/hayden/Desktop/react_inflearn/boilerplate-mern-stack-master

[0] > nodemon server/index.js

[0] 

[0] [nodemon] 1.19.4

[0] [nodemon] to restart at any time, enter `rs`

[0] [nodemon] watching dir(s): *.*

[0] [nodemon] watching extensions: js,mjs,json

[0] [nodemon] starting `node server/index.js`

[0] internal/modules/cjs/loader.js:834

[0]   throw err;

[0]   ^

[0] 

[0] Error: Cannot find module 'bcrypt'

[0] Require stack:

[0] - /Users/hayden/Desktop/react_inflearn/boilerplate-mern-stack-master/server/models/User.js

[0] - /Users/hayden/Desktop/react_inflearn/boilerplate-mern-stack-master/server/routes/users.js

[0] - /Users/hayden/Desktop/react_inflearn/boilerplate-mern-stack-master/server/index.js

[0]     at Function.Module._resolveFilename (internal/modules/cjs/loader.js:831:15)

[0]     at Function.Module._load (internal/modules/cjs/loader.js:687:27)

[0]     at Module.require (internal/modules/cjs/loader.js:903:19)

[0]     at require (internal/modules/cjs/helpers.js:74:18)

[0]     at Object.<anonymous> (/Users/hayden/Desktop/react_inflearn/boilerplate-mern-stack-master/server/models/User.js:2:16)

[0]     at Module._compile (internal/modules/cjs/loader.js:1015:30)

[0]     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1035:10)

[0]     at Module.load (internal/modules/cjs/loader.js:879:32)

[0]     at Function.Module._load (internal/modules/cjs/loader.js:724:14)

[0]     at Module.require (internal/modules/cjs/loader.js:903:19)

[0]     at require (internal/modules/cjs/helpers.js:74:18)

[0]     at Object.<anonymous> (/Users/hayden/Desktop/react_inflearn/boilerplate-mern-stack-master/server/routes/users.js:3:18)

[0]     at Module._compile (internal/modules/cjs/loader.js:1015:30)

[0]     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1035:10)

[0]     at Module.load (internal/modules/cjs/loader.js:879:32)

[0]     at Function.Module._load (internal/modules/cjs/loader.js:724:14) {

[0]   code: 'MODULE_NOT_FOUND',

[0]   requireStack: [

[0]     '/Users/hayden/Desktop/react_inflearn/boilerplate-mern-stack-master/server/models/User.js',

[0]     '/Users/hayden/Desktop/react_inflearn/boilerplate-mern-stack-master/server/routes/users.js',

[0]     '/Users/hayden/Desktop/react_inflearn/boilerplate-mern-stack-master/server/index.js'

[0]   ]

[0] }

[0] [nodemon] app crashed - waiting for file changes before starting...

[1] [HPM] Proxy created: /  -> http://localhost:5000

[1] ℹ ｢wds｣: Project is running at http://192.168.0.60/

[1] ℹ ｢wds｣: webpack output is served from 

[1] ℹ ｢wds｣: Content not from webpack is served from /Users/hayden/Desktop/react_inflearn/boilerplate-mern-stack-master/client/public

[1] ℹ ｢wds｣: 404s will fallback to /

[1] Starting the development server...

[1] 

[1] Browserslist: caniuse-lite is outdated. Please run:

[1] npx browserslist@latest --update-db

[1] Compiled with warnings.

[1] 

[1] ./src/components/views/LoginPage/LoginPage.js

[1]   Line 74:11:  'dirty' is assigned a value but never used        no-unused-vars

[1]   Line 79:11:  'handleReset' is assigned a value but never used  no-unused-vars

[1] 

[1] ./src/components/views/RegisterPage/RegisterPage.js

[1]   Line 92:11:  'dirty' is assigned a value but never used        no-unused-vars

[1]   Line 97:11:  'handleReset' is assigned a value but never used  no-unused-vars

[1] 

[1] Search for the keywords to learn more about each warning.

[1] To ignore, add // eslint-disable-next-line to the line before.

[1] 

[1] [HPM] Error occurred while trying to proxy request /api/users/auth from localhost:3000 to http://localhost:5000 (ECONNREFUSED) (https://nodejs.org/api/errors.html#errors_common_system_errors)

[1] [HPM] Error occurred while trying to proxy request /api/users/auth from localhost:3000 to http://localhost:5000 (ECONNREFUSED) (https://nodejs.org/api/errors.html#errors_common_system_errors)

[1] [HPM] Error occurred while trying to proxy request /api/users/auth from localhost:3000 to http://localhost:5000 (ECONNREFUSED) (https://nodejs.org/api/errors.html#errors_common_system_errors)

[1] [HPM] Error occurred while trying to proxy request /api/users/auth from localhost:3000 to http://localhost:5000 (ECONNREFUSED) (https://nodejs.org/api/errors.html#errors_common_system_errors)

[1] [HPM] Error occurred while trying to proxy request /api/users/auth from localhost:3000 to http://localhost:5000 (ECONNREFUSED) (https://nodejs.org/api/errors.html#errors_common_system_errors)

[1] [HPM] Error occurred while trying to proxy request /api/users/register from localhost:3000 to http://localhost:5000 (ECONNREFUSED) (https://nodejs.org/api/errors.html#errors_common_system_errors)

[1] [HPM] Error occurred while trying to proxy request /api/users/auth from localhost:3000 to http://localhost:5000 (ECONNREFUSED) (https://nodejs.org/api/errors.html#errors_common_system_errors)

[1] [HPM] Error occurred while trying to proxy request /api/users/login from localhost:3000 to http://localhost:5000 (ECONNREFUSED) (https://nodejs.org/api/errors.html#errors_common_system_errors)

[1] [HPM] Error occurred while trying to proxy request /api/users/auth from localhost:3000 to http://localhost:5000 (ECONNREFUSED) (https://nodejs.org/api/errors.html#errors_common_system_errors)