CodeChef User Scraper API

A simple Express.js API that fetches live CodeChef user data using Puppeteer with Redis caching.

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🎯 Features

• User Profile Info
• Rating Graph Data
• Recent Accepted Submissions
• Aggregated Whole Profile
• Upcoming Contests
• Redis-based caching
• Swagger API Docs

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🛠️ API Endpoints

Route	What it does
/health	Health check
/api/whole/:handle	Full profile data
/api/profile/:handle	Basic user info
/api/ratings/:handle	Ratings history
/api/recent/:handle	Recent submissions
/api/upcoming	Upcoming contests

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⚙️ Tech Stack

• Express.js server
• Puppeteer (headless scraping)
• Redis (caching)
• Clean REST APIs

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🚀 Setup Instructions

Prerequisites

• Node.js 18+
• Redis server
• Chrome/Chromium browser

Installation

1. Clone the Repository

   git clone https://github.com/your-username/codechef-data-scraper.git
   cd codechef-data-scraper

2. Install Dependencies

   npm install

3. Configure Environment

   cp .env.example .env

   Edit .env with your settings:

   PORT=8800
   REDIS_HOST=localhost
   REDIS_PORT=6379
   CACHE_TTL=3600

4. Start Redis (if not running)

   redis-server

5. Start Development Server

   npm run dev

6. Test the API

   http://localhost:8800/api/profile/your_codechef_username
   http://localhost:8800/api/whole/your_codechef_username
   

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🔧 Configuration

Environment Variables

• PORT - Server port (default: 8800)
• NODE_ENV - Environment (development/production)
• REDIS_HOST - Redis host (default: localhost)
• REDIS_PORT - Redis port (default: 6379)
• REDIS_PASSWORD - Redis password (optional)
• CACHE_TTL - Cache TTL in seconds (default: 3600)
• PUPPETEER_EXECUTABLE_PATH - Chrome path (auto-detected if not set)

Chrome Detection

The app automatically detects Chrome/Chromium:

• Windows: C:\Program Files\Google\Chrome\Application\chrome.exe
• Linux: /usr/bin/google-chrome, /usr/bin/chromium
• Custom: Set PUPPETEER_EXECUTABLE_PATH to override

Redis (Optional)

• With Redis: Full caching + distributed rate limiting
• Without Redis: Works fine, uses in-memory rate limiting (single instance only)

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🔍 Error Handling

• 400 Bad Request - Invalid input
• 404 Not Found - User not found
• 500 Internal Server Error - Server errors
• 503 Service Unavailable - Connection issues

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📝 License

ISC

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🧑‍💻 Author

@gowtham-2oo5