CodeCollab

CodeCollab is a real-time collaborative coding platform that enables multiple developers to write, discuss, and execute code together in a shared workspace. Built with modern web technologies and WebSockets, it provides a seamless experience for collaborative problem-solving, interview preparation, pair programming, and team-based coding sessions.

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🌐 Live Demo

🔗 https://code-collab-phi-one.vercel.app

Note: The frontend is deployed on Vercel. The backend and Docker-based code execution environment are available in the source code and can be run locally.

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🔗 Repository

GitHub: https://github.com/nisatsama/codecollab

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📸 Screenshots

Join Page

Editor Page

✨ Features

🔹 Real-Time Collaborative Code Editor

• Multiple users can join the same coding room and edit code simultaneously.
• Changes are synchronized instantly across all connected clients using Socket.IO.
• Supports multiple concurrent participants in a shared room.

🔹 Room-Based Collaboration

• Create a unique coding room instantly.
• Share room IDs with teammates using a one-click copy feature.
• Join existing rooms using a valid room ID.

🔹 Persistent Session State

• New participants joining an active room can instantly view:

  • Current editor contents
  • Previous chat messages

• Ensures late joiners stay synchronized with ongoing collaboration.

🔹 Real-Time Group Chat

• Integrated chat system for communication during coding sessions.
• Messages are delivered instantly using WebSocket connections.
• Enables discussion, debugging, and collaboration without leaving the workspace.

🔹 Multi-Language Code Execution

Execute code directly from the browser with containerized execution support.

Supported Languages:

• JavaScript
• Java
• Python
• C++

🔹 Secure Containerized Execution

• Code execution is isolated using Docker containers.
• Prevents user programs from affecting the host system.
• Provides a safer and more scalable execution environment.

🔹 Instant Output Generation

• Compile and run code with a single click.
• Display execution results directly inside the application.

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📊 Project Statistics

• Real-time collaborative editor
• 4 programming languages supported
• Docker-based sandboxed execution
• WebSocket-powered synchronization
• Room-based multi-user collaboration

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🏗️ System Architecture

┌─────────────┐
│ React Frontend │
└──────┬──────┘
       │ HTTP / WebSocket
       ▼
┌─────────────────┐
│ Node.js + Express│
└──────┬──────────┘
       │
       ├── Socket.IO
       │      │
       │      └── Real-Time Collaboration
       │
       └── Docker Containers
              │
              ├── JavaScript Runtime
              ├── Python Runtime
              ├── Java Runtime
              └── C++ Compiler

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🛠️ Tech Stack

Frontend

• React.js
• Axios
• Socket.IO Client

Backend

• Node.js
• Express.js
• Socket.IO

Code Execution

• Docker
• Language-specific runtimes and compilers

Communication

• WebSockets
• Real-Time Event Synchronization

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🚀 Getting Started

Prerequisites

• Node.js
• Docker Desktop
• npm

Clone Repository

git clone https://github.com/yourusername/codecollab.git
cd codecollab

Install Dependencies

Frontend

cd client
npm install

Backend

cd server
npm install

Configure Environment Variables

Create a .env file inside the server directory.

PORT=5000

Start Backend

npm start

Start Frontend

npm run dev

Run Docker

Ensure Docker Desktop is running before executing code.

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🎯 Use Cases

• Technical Interview Preparation
• Pair Programming
• Competitive Programming Practice
• Remote Coding Sessions
• Teaching & Mentoring
• Team Collaboration

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📈 Key Engineering Highlights

• Real-time collaborative editing using WebSockets.
• Stateful room synchronization for new participants.
• Automatic state synchronization for newly joined participants, including chat history and current editor state.
• Multi-language code execution pipeline.
• Docker-based sandboxed execution environment.
• Event-driven architecture using Socket.IO for real-time synchronization.
• Support for multiple concurrent users within a room.

Code Editor Experience

• Integrated Monaco Editor for a VS Code-like coding experience.
• Syntax highlighting and language switching support.
• Real-time collaborative editing synchronized across participants.

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🔮 Future Enhancements

1. Multi-Language Code Execution

• Support for Java, Python, C, C++, Go, Rust, and more.
• Docker-based isolated execution environments for each language.
• Custom compiler/runtime configurations.

2. File Explorer & Multi-File Projects

• Create and manage multiple files within a room.
• Folder structure support.
• More IDE-like experience.

3. Code Persistence & Room History

• Save sessions to a database.
• Restore previous code and chat history.
• Session snapshots and recovery.

4. GitHub Integration

• Import repositories.
• Commit and push changes directly from CodeCollab.
• Real-world team collaboration workflows.

5. AI-Powered Coding Assistant

• Code explanations.
• Bug detection.
• Refactoring suggestions.
• Context-aware code completion.

6. Scalability Improvements

• Redis Pub/Sub for distributed Socket.IO communication.
• Horizontal scaling across multiple backend instances.
• Load balancing for large numbers of concurrent rooms.
• Container orchestration with Docker and Kubernetes.

Keywords

React.js, Node.js, Express.js, Socket.IO, WebSockets, Docker, Real-Time Collaboration, Monaco Editor, JavaScript, Java, Python, C++, REST APIs, System Design, Event-Driven Architecture

👨‍💻 Author

Nisat Sama

B.Tech Computer Science Engineering

Passionate about building scalable real-time applications, developer tools, and collaborative software systems.

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Why CodeCollab?

CodeCollab demonstrates the integration of real-time systems, distributed communication, containerized code execution, and collaborative software engineering principles into a production-style application. It combines frontend development, backend architecture, WebSocket communication, and Docker orchestration to deliver a complete developer collaboration platform.

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