Google authentication and authorization with OAuth2 and Node.js

This is a simple example of how to use Google's OAuth2 authentication and authorization in a Node.js application. This example uses the passport.js library to access Google APIs.

Prerequisites

• Node.js installed on your machine
• A Google account

Getting started

1. Clone this repository to your local machine
2. Run npm install to install the dependencies
3. Create a new project in the Google Developer Console
4. Enable the Google+ API
5. Create OAuth2 credentials
6. Add http://localhost:3000/auth/google/callback as an authorized redirect URI
7. Create a .env file in the root of the project and add the following environment variables:
   • GOOGLE_CLIENT_ID - Your Google OAuth2 client ID
   • GOOGLE_CLIENT_SECRET - Your Google OAuth2 client secret
   • SESSION_SECRET - A secret key for session management
8. Run npm start to start the application
9. Open your browser and navigate to http://localhost:3000