ProgrammingKnowledge | How to Add Google OAuth2 Login in Node.js | Google OAuth2 Authentication with Passport.js @ProgrammingKnowledge | Uploaded October 2024 | Updated October 2024, 4 days ago.
How to Add Google OAuth2 Login in Node.js | Google OAuth2 Authentication with Passport.js

github.com/harshita795/auth

In this step-by-step tutorial, you will learn how to integrate Google OAuth2 Login into your Node.js application using **Passport.js**. Google OAuth2 allows users to sign in to your application using their Google account, simplifying the login process and improving security. This guide will walk you through the setup process from creating a Google OAuth2 application to adding it into your Node.js project using Passport.js, a popular authentication middleware for Node.js.

By the end of this video, you’ll be able to implement Google OAuth2 authentication in your Node.js app, allowing users to log in with their Google accounts securely and efficiently.

### 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.
2. **Installing and Configuring Passport.js:** How to install Passport.js, configure the `passport-google-oauth20` strategy, and integrate it into your Node.js application.
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.
5. **Creating Callbacks for Google Login:** How to handle successful and failed login attempts using Passport.js callbacks.

### Prerequisites:

- Basic knowledge of **Node.js** and **Express.js**.
- Installed Node.js and npm on your machine.
- A basic understanding of middleware and authentication processes.

### Key Steps:

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

Before implementing OAuth in your Node.js application, you need to create a project in the **Google Developer Console**.

- Go to the [Google Cloud Console](console.cloud.google.com/).
- Create a new project and go to the **API & Services - Credentials** section.
- Create new **OAuth 2.0 Credentials** by configuring:
- **Redirect URI**: This will be the URL Google will redirect to after a successful login (e.g., `http://localhost:3000/auth/google/callback`).
- **Client ID** and **Client Secret**: You’ll use these credentials to integrate Google OAuth2 into your Node.js app.

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

In your Node.js project, install the required packages:
```bash
npm install express passport passport-google-oauth20 express-session
```
- **Express**: For creating the server.
- **Passport.js**: Middleware for authentication.
- **passport-google-oauth20**: Google OAuth2 strategy for Passport.
- **express-session**: Middleware for handling sessions.

#### 3. **Configure Passport.js with Google OAuth2 Strategy:**

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

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

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

Start the server and open `http://localhost:3000/` in your browser. Click the "Login with Google" button, and after successful login, you'll be redirected to the profile page displaying your Google account name.

Run your application:
```bash
node app.js
```

### 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.

- **Scalable Authentication:** Passport.js allows easy integration of other strategies (Facebook, Twitter, etc.) if needed in the future.

### Why Use Google OAuth2 with Passport.js?

- **Simplicity:** Implementing Google login with Passport.js is straightforward and flexible, especially if you're already familiar with middleware in Node.js.

- **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.

By the end of this tutorial, you’ll have a fully functioning Google OAuth2 login system integrated with your Node.js application using Passport.js. Be sure to like, comment, and subscribe for more Node.js and web development tutorials!

**Helpful Resources:**
- Google Developer Console: [console.cloud.google.com/](console.cloud.google.com/)
- Passport.js Documentation: [passportjs.org/](passportjs.org/)

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

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