🎮 Custom Login and Cloud Game Data System

A complete solution for user authentication and cloud-based game data management, built with Unity3D, Next.js, Node.js, and MongoDB.

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🔗 Repositories Used

To fully test and run the system, use all three repositories together:

1. 🎮 Unity3d_project_for_login_saveGame
   → Unity3D client for game login, register, and save game data

2. 🌐 Nodejs_server_for_Unity3dGame_Login_saveData
   → Node.js + MongoDB backend server

3. 🖥️ webapp_for_Unity3dGame_nextjs-
   → Next.js frontend web app for login, account creation, and password reset using the same backend

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🛠️ Features

✅ Unity3D (Frontend)

• Custom login and registration UI
• Save and fetch player data from the cloud
• Upload and retrieve profile pictures
• JWT-based secure authentication
• Error handling and auto login with token

⚙️ Node.js + Express (Backend)

• Argon2 for strong password hashing
• JWT for authentication with auto-refresh
• Email verification and forgot password functionality using Nodemailer
• Multer for profile picture upload (multipart form support)
• IP blocking after multiple failed login attempts
• Express-validator for input sanitization
• Modular routes and controller structure for scalability

💾 MongoDB + Mongoose

• Cloud-hosted MongoDB via MongoDB Atlas
• Mongoose schemas for user and game data
• Secure and structured data management

🌐 Next.js Web App

• Clean and responsive login and registration forms
• Forgot password and password reset flow with JWT email verification
• Connects to the same backend as Unity3D app
• Built using App Router and Tailwind CSS
• Reusable form components and token validation logic

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🌐 Project Structure

.
├── Unity3d_project_for_login_saveGame
│   └── Unity 3D Game Client
├── Nodejs_server_for_Unity3dGame_Login_saveData
│   └── Express.js Backend API
├── webapp_for_Unity3dGame_nextjs-
    └── Next.js Web Frontend (Login, Create Account, Reset Password)

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🚀 How to Run

1. Clone and Start Backend Server

git clone https://github.com/deezero7/Nodejs_server_for_Unity3dGame_Login_saveData
cd Nodejs_server_for_Unity3dGame_Login_saveData
npm install
npm start

• Configure your MongoDB URI and JWT secret in .env

2. Run the Unity Project

• Open Unity3d_project_for_login_saveGame in Unity Editor
• Set backend API URL in Unity scripts
• Play and test login/register + save/load player data

3. Run the Next.js Web App

git clone https://github.com/deezero7/webapp_for_Unity3dGame_nextjs-
cd webapp_for_Unity3dGame_nextjs-
npm install
npm run dev

• Set the backend API URL in your .env.local file

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✅ Highlights

• Custom login and registration system
• Cloud-based save/load of player game data
• Email verification and password reset via JWT tokens
• Argon2 password hashing
• Secure image upload using Multer
• IP blocking on repeated failed logins
• Modular and scalable backend architecture
• Frontend apps built with both Unity3D and Next.js accessing the same backend

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