Passport callback 500 server error

I have been struggling a lot trying to have passport working. I am using passport-github2, but while trying to troubleshoot the issue I tried passport-facebook and twitter as well, and none of them seem to work now.

I had a simple application which was working with facebook/twitter sign in, and now they don't work anymore, so it seems this has to do with a newer version of Passport.

Here is what I have in my github.js file, which is accessed with url api/auth/github

var express = require('express'),
     router = express.Router(),
     config = require('config'),
     githubAuth = config.get('github'),
     githubStrategy = require('passport-github2').Strategy,
     flash = require('connect-flash'),

     GITHUB_CLIENT_ID = githubAuth.githubClientID,
     GITHUB_CLIENT_SECRET = githubAuth.githubClientSecret,

     app = express();

 //passport vars
 var passport = require('passport'),
     session = require('express-session'),
     methodOverride = require('method-override'),
     bodyParser = require("body-parser"),
     cookieParser = require("cookie-parser");



 passport.serializeUser(function (user, done) {
     done(null, user);
 });

 passport.deserializeUser(function (obj, done) {
     done(null, obj);
 });

 passport.use(new githubStrategy({
         clientID: GITHUB_CLIENT_ID,
         clientSecret: GITHUB_CLIENT_SECRET,
         callbackURL: 'http://localhost:3000/api/auth/github/callback'
     },
     function (token, tokenSecret, profile, done) {
         // asynchronous verification, for effect...
         return done(null, profile);
     }
 ));

 app.use(cookieParser());
 app.use(bodyParser());
 app.use(methodOverride());
 app.use(session({
     secret: 'keyboard cat',
     resave: true,
     saveUninitialized: true
 }));
 app.use(passport.initialize());
 app.use(passport.session()); // persistent login sessions
 app.use(flash())

 router.get('/', passport.authenticate('github', {
     scope: ['user']
 }));


 router.get('/callback',
     passport.authenticate('github', {
         failureRedirect: '/',
         successRedirect: '/'
     }),
     function (req, res) {
         res.send('Hello World!!');
     }
 );

 module.exports = router;

When i go to http://localhost:3000/api/auth/github github lets me authenticate and I click on the green button that will take me back to the callback url, and there is where everything explodes and I see this message:

Error
   at /Users/cynt005/Documents/Code/UXUIteamwebsite/node_modules/passport-github2/lib/strategy.js:96:19
   at passBackControl (/Users/cynt005/Documents/Code/UXUIteamwebsite/node_modules/oauth/lib/oauth2.js:132:9)
   at IncomingMessage.<anonymous> (/Users/cynt005/Documents/Code/UXUIteamwebsite/node_modules/oauth/lib/oauth2.js:157:7)
   at emitNone (events.js:110:20)
   at IncomingMessage.emit (events.js:207:7)
   at endReadableNT (_stream_readable.js:1059:12)
   at _combinedTickCallback (internal/process/next_tick.js:138:11)
   at process._tickCallback (internal/process/next_tick.js:180:9)

Console:

GET http://localhost:3000/api/auth/github/callback?code=60a130c5c54a6fc30266 500 (Internal Server Error)

I have googled all across the web, and I dont find a solution that works for me. There is a thread in github but no solution has yet been provided officially:

https://github.com/jaredhanson/passport-facebook/issues/100

Any help will be appreciated !!

Solved. The issue was that I had to keep everything in the same file as app.js

I still would like to know if there is a better/tidy way to separate this file without breaking the code.