How to Add Google OAuth2 Login in Node.js | Google OAuth2 Authentication with Passport.js

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### What You’ll Learn:

1. **Setting Up a Google OAuth2 Application:** How to create a Google project and configure OAuth credentials in the Google Developer Console.
3. **Setting Up Routes for Google OAuth2 Login:** How to create routes for initiating and handling Google OAuth2 login and logout.
4. **Handling User Sessions with Express:** How to set up session management using `express-session` for persistent user authentication.

### Prerequisites:

- A basic understanding of middleware and authentication processes.

### Key Steps:

#### 1. **Create a Google OAuth2 Application:**

- Create a new project and go to the **API & Services - Credentials** section.
- Create new **OAuth 2.0 Credentials** by configuring:

#### 2. **Install Required Dependencies:**

```bash
npm install express passport passport-google-oauth20 express-session
```
- **Express**: For creating the server.
- **passport-google-oauth20**: Google OAuth2 strategy for Passport.
- **express-session**: Middleware for handling sessions.

#### 4. **Set Up Express App and Session Management:**

#### 5. **Create Google OAuth2 Login and Callback Routes:**

#### 6. **Run Your Application:**

Run your application:
```bash
```

### Key Features:

- **Secure OAuth2 Authentication:** Leverage Google’s secure OAuth2 framework to protect your users' credentials.

- **Seamless User Experience:** Users can log in with their Google accounts, eliminating the need to remember passwords.

- **Security:** OAuth2 adds an extra layer of security to your app by handling user authentication with a trusted provider like Google.

- **Scalability:** Once implemented, you can easily add other authentication providers (Facebook, GitHub, etc.) using the same methodology.

**Helpful Resources:**

If you encounter any issues, feel free to leave a comment below, and we’ll help you troubleshoot!

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