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🚀 GenCode Backend

This is the backend for GenCode, an AI-powered platform to generate and solve competitive programming questions from user-defined prompts.

🛠️ Getting Started

1. Clone the Repository

git clone https://github.com/karannfr/GenCode-Backend.git
cd GenCode-Backend

2. Install Dependencies

npm install

3. Configure Environment Variables

Copy the .env.example file and rename it to .env:

cp .env.example .env

Open .env and fill in your credentials:

PORT=5000
MONGO_URI=your_mongodb_connection_string
JWT_SECRET=your_jwt_secret_key
GEMINI_API_KEY=your_gemini_2_5_flash_key
JUDGE0_URL=https://judge0-ce.p.rapidapi.com
JUDGE0_KEY=your_rapidapi_judge0_key

⚠️ Keep your .env file private — never push it to GitHub.

4. Start the Server

npm start

The server will start on:

http://localhost:5000

🌐 CORS

This backend only accepts requests from:

https://gencode.karnx.dev

To allow other domains (for dev or testing), update the CORS whitelist in server.js.

📦 Features

  • ✨ Generate coding problems using Gemini 2.5 Flash
  • 🧠 Execute code in real time with Judge0 API
  • 🔐 Secure user authentication via JWT
  • 📊 Track user submissions and performance history
  • ⏱️ Rate-limiting to prevent abuse

🧪 Testing

You can test endpoints using:

After exceeding the request threshold, the server will return:

{
  "error": "Too many requests"
}

(Status code: 429)