title: Error: Cannot find module './formats' when deploying node app on heroku server
body: <p>I have created free account on heroku. I am trying to deploy a node app on this but this showing the following error. </p>
  
  <pre><code>2017-06-19T11:25:53.680527+00:00 app[web.1]: &gt; mypu@1.0.0 start /app
  2017-06-19T11:25:53.680528+00:00 app[web.1]: &gt; node server.js
  2017-06-19T11:25:53.680528+00:00 app[web.1]: 
  2017-06-19T11:25:53.862204+00:00 app[web.1]: module.js:471
  2017-06-19T11:25:53.862207+00:00 app[web.1]:     throw err;
  2017-06-19T11:25:53.862208+00:00 app[web.1]:     ^
  2017-06-19T11:25:53.862209+00:00 app[web.1]: 
  2017-06-19T11:25:53.862210+00:00 app[web.1]: Error: Cannot find module './formats'
  2017-06-19T11:25:53.862211+00:00 app[web.1]:     at Function.Module._resolveFilename (module.js:469:15)
  2017-06-19T11:25:53.862212+00:00 app[web.1]:     at Function.Module._load (module.js:417:25)
  2017-06-19T11:25:53.862212+00:00 app[web.1]:     at Module.require (module.js:497:17)
  2017-06-19T11:25:53.862213+00:00 app[web.1]:     at require (internal/module.js:20:19)
  2017-06-19T11:25:53.862229+00:00 app[web.1]:     at Object.&lt;anonymous&gt; (/app/node_modules/qs/lib/stringify.js:4:15)
  2017-06-19T11:25:53.862230+00:00 app[web.1]:     at Module._compile (module.js:570:32)
  2017-06-19T11:25:53.862231+00:00 app[web.1]:     at Object.Module._extensions..js (module.js:579:10)
  2017-06-19T11:25:53.862231+00:00 app[web.1]:     at Module.load (module.js:487:32)
  2017-06-19T11:25:53.862232+00:00 app[web.1]:     at tryModuleLoad (module.js:446:12)
  2017-06-19T11:25:53.862233+00:00 app[web.1]:     at Function.Module._load (module.js:438:3)
  2017-06-19T11:25:53.872899+00:00 app[web.1]: 
  2017-06-19T11:25:53.886139+00:00 app[web.1]: npm ERR! Linux 3.13.0-112-generic
  2017-06-19T11:25:53.886419+00:00 app[web.1]: npm ERR! argv "/app/.heroku/node/bin/node" "/app/.heroku/node/bin/npm" "start"
  2017-06-19T11:25:53.886602+00:00 app[web.1]: npm ERR! node v6.11.0
  2017-06-19T11:25:53.886778+00:00 app[web.1]: npm ERR! npm  v3.10.10
  2017-06-19T11:25:53.886955+00:00 app[web.1]: npm ERR! code ELIFECYCLE
  2017-06-19T11:25:53.887988+00:00 app[web.1]: npm ERR! mypu@1.0.0 start: `node server.js`
  2017-06-19T11:25:53.888109+00:00 app[web.1]: npm ERR! Exit status 1
  2017-06-19T11:25:53.888249+00:00 app[web.1]: npm ERR! 
  2017-06-19T11:25:53.888373+00:00 app[web.1]: npm ERR! Failed at the mypu@1.0.0 start script 'node server.js'.
  2017-06-19T11:25:53.888490+00:00 app[web.1]: npm ERR! Make sure you have the latest version of node.js and npm installed.
  2017-06-19T11:25:53.888603+00:00 app[web.1]: npm ERR! If you do, this is most likely a problem with the mypu package,
  2017-06-19T11:25:53.888719+00:00 app[web.1]: npm ERR! not with npm itself.
  2017-06-19T11:25:53.889463+00:00 app[web.1]: npm ERR! Tell the author that this fails on your system:
  2017-06-19T11:25:53.889583+00:00 app[web.1]: npm ERR!     node server.js
  2017-06-19T11:25:53.889701+00:00 app[web.1]: npm ERR! You can get information on how to open an issue for this project with:
  2017-06-19T11:25:53.889807+00:00 app[web.1]: npm ERR!     npm bugs mypu
  2017-06-19T11:25:53.890108+00:00 app[web.1]: npm ERR! Or if that isn't available, you can get their info via:
  2017-06-19T11:25:53.890263+00:00 app[web.1]: npm ERR!     npm owner ls mypu
  2017-06-19T11:25:53.890433+00:00 app[web.1]: npm ERR! There is likely additional logging output above.
  2017-06-19T11:25:53.898834+00:00 app[web.1]: 
  2017-06-19T11:25:53.899088+00:00 app[web.1]: npm ERR! Please include the following file with any support request:
  2017-06-19T11:25:53.899216+00:00 app[web.1]: npm ERR!     /app/npm-debug.log
  Disconnected from log stream. There may be events happening that you do not see here! Attempting to reconnect...
  2017-06-19T11:25:53.888719+00:00 app[web.1]: npm ERR! not with npm itself.
  2017-06-19T11:25:53.889463+00:00 app[web.1]: npm ERR! Tell the author that this fails on your system:
  2017-06-19T11:25:53.889583+00:00 app[web.1]: npm ERR!     node server.js
  2017-06-19T11:25:53.889701+00:00 app[web.1]: npm ERR! You can get information on how to open an issue for this project with:
  2017-06-19T11:25:53.889807+00:00 app[web.1]: npm ERR!     npm bugs mypu
  2017-06-19T11:25:53.890108+00:00 app[web.1]: npm ERR! Or if that isn't available, you can get their info via:
  2017-06-19T11:25:53.890263+00:00 app[web.1]: npm ERR!     npm owner ls mypu
  2017-06-19T11:25:53.890433+00:00 app[web.1]: npm ERR! There is likely additional logging output above.
  2017-06-19T11:25:53.898834+00:00 app[web.1]: 
  2017-06-19T11:25:53.899088+00:00 app[web.1]: npm ERR! Please include the following file with any support request:
  2017-06-19T11:25:53.899216+00:00 app[web.1]: npm ERR!     /app/npm-debug.log
  Disconnected from log stream. There may be events happening that you do not see here! Attempting to reconnect...
  Disconnected from log stream. There may be events happening that you do not see here! Attempting to reconnect...
  2017-06-19T11:25:53.888719+00:00 app[web.1]: npm ERR! not with npm itself.
  2017-06-19T11:25:53.889463+00:00 app[web.1]: npm ERR! Tell the author that this fails on your system:
  2017-06-19T11:25:53.889583+00:00 app[web.1]: npm ERR!     node server.js
  2017-06-19T11:25:53.889701+00:00 app[web.1]: npm ERR! You can get information on how to open an issue for this project with:
  2017-06-19T11:25:53.889807+00:00 app[web.1]: npm ERR!     npm bugs mypu
  2017-06-19T11:25:53.890108+00:00 app[web.1]: npm ERR! Or if that isn't available, you can get their info via:
  2017-06-19T11:25:53.890263+00:00 app[web.1]: npm ERR!     npm owner ls mypu
  2017-06-19T11:25:53.890433+00:00 app[web.1]: npm ERR! There is likely additional logging output above.
  2017-06-19T11:25:53.898834+00:00 app[web.1]: 
  2017-06-19T11:25:53.899088+00:00 app[web.1]: npm ERR! Please include the following file with any support request:
  2017-06-19T11:25:53.899216+00:00 app[web.1]: npm ERR!     /app/npm-debug.log
  Disconnected from log stream. There may be events happening that you do not see here! Attempting to reconnect...
  2017-06-19T11:25:53.888719+00:00 app[web.1]: npm ERR! not with npm itself.
  2017-06-19T11:25:53.889463+00:00 app[web.1]: npm ERR! Tell the author that this fails on your system:
  2017-06-19T11:25:53.889583+00:00 app[web.1]: npm ERR!     node server.js
  2017-06-19T11:25:53.889701+00:00 app[web.1]: npm ERR! You can get information on how to open an issue for this project with:
  2017-06-19T11:25:53.889807+00:00 app[web.1]: npm ERR!     npm bugs mypu
  2017-06-19T11:25:53.890108+00:00 app[web.1]: npm ERR! Or if that isn't available, you can get their info via:
  2017-06-19T11:25:53.890263+00:00 app[web.1]: npm ERR!     npm owner ls mypu
  2017-06-19T11:25:53.890433+00:00 app[web.1]: npm ERR! There is likely additional logging output above.
  2017-06-19T11:25:53.898834+00:00 app[web.1]: 
  2017-06-19T11:25:53.899088+00:00 app[web.1]: npm ERR! Please include the following file with any support request:
  2017-06-19T11:25:53.899216+00:00 app[web.1]: npm ERR!     /app/npm-debug.log
  Disconnected from log stream. There may be events happening that you do not see here! Attempting to reconnect...
  2017-06-19T11:25:53.888719+00:00 app[web.1]: npm ERR! not with npm itself.
  2017-06-19T11:25:53.889463+00:00 app[web.1]: npm ERR! Tell the author that this fails on your system:
  2017-06-19T11:25:53.889583+00:00 app[web.1]: npm ERR!     node server.js
  2017-06-19T11:25:53.889701+00:00 app[web.1]: npm ERR! You can get information on how to open an issue for this project with:
  2017-06-19T11:25:53.889807+00:00 app[web.1]: npm ERR!     npm bugs mypu
  2017-06-19T11:25:53.890108+00:00 app[web.1]: npm ERR! Or if that isn't available, you can get their info via:
  2017-06-19T11:25:53.890263+00:00 app[web.1]: npm ERR!     npm owner ls mypu
  2017-06-19T11:25:53.890433+00:00 app[web.1]: npm ERR! There is likely additional logging output above.
  </code></pre>
  
  <p>Same application works on my local machine fine. Here is the package.json</p>
  
  <pre><code>{
    "name": "mypu",
    "version": "1.0.0",
    "description": "mypu",
    "main": "index.js",
    "scripts": {
      "start" : "node server.js"
    },
    "repository": {
      "type": "git",
      "url": ""
    },
    "author": "",
    "license": "ISC",
    "bugs": {
      "url": ""
    },
    "homepage": "",
    "dependencies": {
      "body-parser": "^1.15.0",
      "connect-timeout": "^1.8.0",
      "express": "^4.13.4",
      "generic-pool": "^2.4.2",
      "log4js": "^1.1.1",
      "multer": "^1.2.0",
      "mysql": "^2.10.2",
      "requestify": "^0.1.17"
    }
  }
  </code></pre>
  
  <p>What could be the issue? Am I missing something?</p>