A modern chat interface powered by Node.js backend with real-time streaming support via Server-Sent Events (SSE).

Note: This project has been converted from a Tauri-based desktop application to a web-based application with Node.js backend, removing file tree, PDF/Excel viewers, and authentication features while keeping session and chat functionality.

• Frontend: React + TypeScript + Vite
• Backend: Node.js + Express + TypeScript
• Communication: REST API + Server-Sent Events (SSE)
• Features: Session management, real-time chat streaming, notes

• Node.js 18+
• npm or yarn

1. Clone and install dependencies

   git clone <repository-url>
   cd codex-ui
   npm install
   cd backend && npm install && cd ..

2. Start the backend server

   cd backend && npm run dev

   Backend runs on http://localhost:3001

3. Start the frontend (new terminal)

   npm run dev  

   Frontend runs on http://localhost:1420

• Real-time Chat: Send messages and receive streaming responses
• Session Management: Create and manage multiple chat sessions
• SSE Streaming: Server-Sent Events for real-time communication
• Notes System: Basic note-taking functionality
• Dark/Light Theme: Theme switching support
• Responsive UI: Works on different screen sizes

• File tree navigation
• PDF viewer
• Excel viewer
• Authentication/login system
• Tauri desktop functionality

• GET /api/sessions - Get all sessions
• POST /api/sessions - Create new session
• GET /api/sessions/:id - Get specific session
• POST /api/chat/message - Send message (non-streaming)
• GET /api/chat/stream/:sessionId - SSE endpoint for streaming chat
• GET /api/health - Backend health check

codex-ui/
├── backend/                 # Node.js backend
│   ├── src/
│   │   ├── routes/         # API routes
│   │   ├── services/       # Business logic
│   │   └── index.ts        # Server entry point
│   └── package.json
├── src/                    # React frontend
│   ├── components/         # React components
│   ├── services/          # API client services
│   └── stores/            # State management
└── package.json

• Session data is stored in memory (resets on server restart)
• Backend provides mock AI responses for demonstration
• CORS configured for frontend-backend communication
• Uses Zustand for state management on frontend

npm run build              # Build frontend
cd backend && npm run build  # Build backend
cd backend && npm start      # Start production server

This project is licensed under the MIT License - see the LICENSE file for details.