Node Passport Authentication for google, facebook, twitter & github.

1. Do an npm install to install all the dependencies

2. Get the App Id & secret for facebook & google

3. For facebook -->

   • Set the app url as http://localhost:3000/ & get the appId & secret key.
   • Add a product "Facebook Login" and set the Valid OAuth as http://localhost:3000/auth/facebook/callback.

4. For Google -->

   • Follow this https://developers.google.com/identity/sign-in/web/devconsole-project?authuser=2 & get the AppId & secret key
   • Set the javascript origin url as - http://localhost:3000 & Authorized redirect URI as http://localhost:3000/auth/google/callback
   • Enable the google plus API from the APIs library

5. For Github -->

   • Open https://github.com/settings/developers & register an app.
   • Set the test params & the "Authorization callback URL" as http://localhost:3000/auth/github/callback & the "Homepage URL" as http://localhost:3000/

6. For Twitter -->

   • Move to https://apps.twitter.com/ & create an app
   • set the website as http://www.example.com & "callback url" as http://localhost:3000/auth/twitter/callback