delta-google-authentication

Google Sign-In authentication package for Express.js.

🚀 Installation

``sh
npm install delta-google-authentication
`

📌 Setup

Create a .env file and add:

`
GOOGLE_CLIENT_ID=your_google_client_id
GOOGLE_CLIENT_SECRET=your_google_client_secret
GOOGLE_CALLBACK_URL=http://localhost:5000/auth/google/callback
JWT_SECRET=your_jwt_secret
`

🔹 Usage

`javascript
import express from "express";
import { googleAuth, verifyToken } from "delta-google-authentication";

const app = express();

// Example function for user database handling
const findOrCreateUser = async (userData) => {
// Your database logic goes here (MongoDB, PostgreSQL, MySQL, etc.)
};

googleAuth.init(app, {
clientID: process.env.GOOGLE_CLIENT_ID,
clientSecret: process.env.GOOGLE_CLIENT_SECRET,
callbackURL: process.env.GOOGLE_CALLBACK_URL,
jwtSecret: process.env.JWT_SECRET,
redirectURL: process.env.FRONTEND_DASHBOARD_URL,
findOrCreateUser, // Passing custom DB function
});

// Example Protected Route
app.get("/protected", verifyToken, (req, res) => {
res.json({ message: "Protected Route Accessed", user: req.user });
});

app.listen(5000, () => console.log("Server running on port 5000"));
`

🔹 Routes

| Method | Route | Description |
| ------ | ----------------------- | ------------------------------------------ |
| GET | /auth/google | Redirects user to Google Sign-In |
| GET | /auth/google/callback | Handles Google OAuth response, returns JWT |
| GET | /protected | Example protected route (requires JWT) |

🔹 Logout

To log out, simply remove the JWT token from local storage or cookies:

`javascript
localStorage.removeItem("token");
window.location.href = "/";
``

📜 License

This project is licensed under the MIT License.

💻 Contributing

Feel free to submit issues and pull requests on GitHub.

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Happy coding! 🚀