Simple side-project that integrates the google sign-in functionality thanks to oAuth2.0. This is made with:

 - Node.js (runtime)
 - express.js (framework)
 - ejs (template engine)
 - passport.js (framework)
 - passport-google-oauth20 (strategy of passport.js)

In this account i will build another project, more complete in ejs/html terms. So you can understand it more and more. It will be a 'real project scenario '.

Before coding, most importantly, you've to setup this project inside the dev console of google.

https://console.cloud.google.com

General Steps:

• Create the project

• Configure the OAuth consent screen:

  - External user type >
  - add scopes:  .../auth/userinfo.email, 	.../auth/userinfo.profile
  - add some emails to test the project in development mode
  - Go in the 'credentials' section and create ID client OAuth
  - Set 'web application' as type of the project(if it is naturally)
  - as redirect URI, set:   http://localhost:80/google/callback
  - Fill the credentials get from Google and fill them in the .env of the project