This is the backend server for a MERN stack authentication system, offering secure APIs for user registration, login, and authentication. Built with Node.js, Express, and MongoDB, it ensures robust user management with JWT-based authentication and password hashing for enhanced security.

• User registration
• User login
• Token-based authentication
• Password hashing
• User logout

• Node.js
• Express.js
• MongoDB
• Mongoose
• JSON Web Tokens (JWT)
• bcrypt.js

• Node.js installed
• MongoDB installed and running

1. Clone the repository:

   git clone https://github.com/yourusername/Authentication-Backend.git

2. Navigate to the server directory:

   cd Authentication-Backend

3. Install dependencies:

   npm install

1. Create a .env file in the root of the server directory and add the following environment variables:

   PORT=5000
   MONGO_URI=your_mongodb_connection_string
   JWT_SECRET=your_jwt_secret
   EMAIL_SERVICE=your_email_service_provider
   EMAIL_USERNAME=your_email_username
   EMAIL_PASSWORD=your_email_password

2. Refer to the .env file in your code to access these variables:

   require('dotenv').config();
   const port = process.env.PORT;
   const mongoUri = process.env.MONGO_URI;
   const jwtSecret = process.env.JWT_SECRET;
   const emailService = process.env.EMAIL_SERVICE;
   const emailUsername = process.env.EMAIL_USERNAME;
   const emailPassword = process.env.EMAIL_PASSWORD;

Start the server:

npm start

The server will be running on http://localhost:5000.

• POST /api/auth/register - Register a new user
• POST /api/auth/login - Login a user
• GET /api/auth/user - Get authenticated user details
• POST /api/auth/register - Register a new user
• POST /api/auth/login - Login a user
• GET /api/auth/user - Get authenticated user details
• POST /api/auth/logout - Logout a user
• POST /api/auth/refresh-token - Refresh authentication token

This project is licensed under the MIT License.