BobInsight - Interactive Function Flow Mapper

Built for IBM Bob Hackathon 2026

BobInsight is a developer tool that analyzes GitHub repositories and visualizes function-level dependencies as an interactive graph. It uses the IBM Bob API to understand code structure and presents it through an intuitive React Flow interface.

🚀 Features

• GitHub Repository Analysis: Clone and analyze any public GitHub repository
• Interactive Graph Visualization: Explore function-to-function dependencies with React Flow
• Multi-Tier Fallback System: Ensures the graph always renders, even if the API is unavailable
• Real-time Inspection: Click nodes and edges to see detailed information
• Secure by Design: URL sanitization, rate limiting, and no arbitrary code execution
• Modern Tech Stack: React 18, TypeScript, Fastify, Tailwind CSS

📁 Project Structure

bobinsight-monorepo/
├── apps/
│   ├── frontend/          # React + Vite + React Flow
│   └── backend/           # Fastify + TypeScript API
├── packages/
│   └── shared-types/      # Shared TypeScript interfaces
├── package.json           # Workspace root
└── .env.example          # Environment template

🛠️ Tech Stack

Frontend

• React 18 with TypeScript
• Vite (build tool)
• React Flow (graph visualization)
• Tailwind CSS (styling)
• Zustand (state management)
• Axios (HTTP client)

Backend

• Node.js 20+
• Fastify (web framework)
• TypeScript
• simple-git (Git operations)
• node-cache (caching)
• axios + axios-retry (API client)
• bottleneck (rate limiting)

📋 Prerequisites

• Node.js 20+ and npm 10+
• Git
• IBM Bob API key (optional - fallback works without it)

🚀 Quick Start

1. Clone the Repository

git clone <your-repo-url>
cd bobinsight-monorepo

2. Install Dependencies

npm install

This will install dependencies for all workspaces (frontend, backend, shared-types).

3. Configure Environment

cp .env.example apps/backend/.env

Edit apps/backend/.env and add your IBM Bob API credentials:

IBM_BOB_API_KEY=your_api_key_here
IBM_BOB_BASE_URL=https://api.ibm-bob.com

Note: If you don't have an API key, the system will automatically use mock fallback data.

4. Build Shared Types

npm run build --workspace=packages/shared-types

5. Start Development Servers

Option A: Start both servers concurrently

npm run dev

Option B: Start servers separately

Terminal 1 (Backend):

npm run dev:backend

Terminal 2 (Frontend):

npm run dev:frontend

6. Access the Application

• Frontend: http://localhost:5173
• Backend API: http://localhost:3000
• Health Check: http://localhost:3000/health

🔧 Development

Available Scripts

# Development
npm run dev              # Start both frontend and backend
npm run dev:frontend     # Start frontend only
npm run dev:backend      # Start backend only

# Build
npm run build            # Build all packages
npm run build:frontend   # Build frontend only
npm run build:backend    # Build backend only

# Testing
npm test                 # Run tests in all workspaces

# Linting
npm run lint             # Lint all workspaces

# Clean
npm run clean            # Remove all node_modules and build artifacts

Project Commands

# Install a dependency in a specific workspace
npm install <package> --workspace=apps/frontend
npm install <package> --workspace=apps/backend

# Run a script in a specific workspace
npm run <script> --workspace=apps/frontend

📡 API Endpoints

Backend API

GET /health

Health check endpoint

Response:

{
  "status": "ok",
  "timestamp": "2026-05-16T15:30:00.000Z",
  "services": {
    "api": "healthy",
    "cache": "healthy"
  }
}

POST /api/analyze

Analyze a GitHub repository

Request:

{
  "repoUrl": "https://github.com/username/repository"
}

Response:

{
  "success": true,
  "data": {
    "nodes": [...],
    "edges": [...]
  },
  "source": "ibm-bob",
  "timestamp": "2026-05-16T15:30:00.000Z"
}

🔒 Security Features

• URL Validation: Only accepts valid GitHub URLs
• No Shell Injection: Uses simple-git API, never exec()
• Secret Management: Credentials loaded from .env, never logged
• Rate Limiting: Max 10 requests per minute per IP
• CORS: Whitelist frontend origin only
• Temp Cleanup: Automatic cleanup of cloned repositories

🎯 Fallback Mechanism

BobInsight implements a 3-tier fallback system:

1. Fallback A: API key missing or API unreachable → Serve hardcoded mock JSON
2. Fallback B: Response time > 15s → Serve pre-cached demo repositories
3. Fallback C: Success rate < 80% → Use local AST parser (future enhancement)

This ensures the frontend graph never breaks, even if the IBM Bob API is unavailable.

🧪 Testing

Example Repositories

Try these repositories for testing:

• https://github.com/expressjs/express - Express.js web framework
• https://github.com/facebook/react - React library
• https://github.com/nodejs/node - Node.js runtime

Manual Testing

1. Enter a GitHub URL in the input field
2. Click "Analyze Repository"
3. Wait for the graph to load
4. Click on nodes to see file details
5. Click on edges to see function call relationships

📦 Deployment

Frontend (Vercel)

cd apps/frontend
npm run build
vercel --prod

Backend (Railway)

cd apps/backend
npm run build
railway up

Environment Variables for Production

Make sure to set these in your deployment platform:

IBM_BOB_API_KEY=<your-production-key>
IBM_BOB_BASE_URL=https://api.ibm-bob.com
NODE_ENV=production
FRONTEND_URL=https://your-frontend-domain.com

🐛 Troubleshooting

Backend won't start

• Check if port 3000 is available
• Verify Node.js version (20+)
• Check .env file exists in apps/backend/

Frontend can't connect to backend

• Verify backend is running on port 3000
• Check CORS configuration in apps/backend/src/server.ts
• Verify proxy configuration in apps/frontend/vite.config.ts

Analysis fails

• Check if the GitHub URL is valid and public
• Verify IBM Bob API key (or rely on fallback)
• Check backend logs for detailed error messages

📚 Documentation

• Project Plan - Detailed implementation plan
• Agent Instructions - AI agent guidelines
• Shared Types - TypeScript interfaces

🤝 Contributing

This project was built for the IBM Bob Hackathon 2026. Contributions are welcome!

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Submit a pull request

📄 License

MIT License - see LICENSE file for details

🏆 Hackathon Team

Built by the BobInsight Team for IBM Bob Hackathon 2026

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Happy Analyzing! 🚀