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Authentication System with Node.js, MongoDB, and Flutter

This project aims to create a simple user authentication system using Node.js and MongoDB. Users can register and log in through a Flutter mobile app. After logging in, users can securely authenticate their sessions using JWT (JSON Web Token).

Technologies

  • Backend: Node.js, Express, MongoDB
  • Database: MongoDB
  • Authentication: JWT (JSON Web Token)
  • Frontend: Flutter (Login and Register Screens)

Folder Structure

/client              # Flutter frontend
/server              # Node.js backend

Installation

1. Backend (Node.js and MongoDB)

  1. Navigate to the server folder: 
    cd server
  2. Install necessary packages: 
    npm install
  3. Create and configure the .env file:
  • Create a .env file in the server/ folder and configure it as follows: 
    PORT=3000
MONGODB_URL=mongodb://YOUR_MONGODB_URL
JWT_SECRET=YOUR_SECRET_KEY
  • PORT: The port the server will run on.
  • MONGODB_URL: MongoDB connection URL (use the IP address of your MongoDB server).
  • JWT_SECRET: The secret key to sign JWT tokens.
  1. Start the backend: 
    npm start
  • The server will run by default on http://localhost:3000.

2. Frontend (Flutter)

  1. Navigate to the client folder: 
    cd client
  2. Install necessary packages: 
    flutter pub get
  3. Configure the lib/core/env/env.dart file:
  • In this file, you need to specify the IP address of your backend server. Configure it as follows and replace YOUR_IP_ADDRESS with your backend server's IP address: 
    class Environment {
static const String baseUrl = 'http://YOUR_IP_ADDRESS:3000/api/user';
}
  1. Run the Flutter app: 
    flutter run