ZAP Labs Backend Server

This is the backend server for the ZAP Labs AI-Powered Interview Training Platform. It proxies requests to the Grok API to ensure secure handling of API keys and proper rate limiting.

Setup and Deployment

Prerequisites

• Node.js 14+
• Grok API key

Local Development

1. Clone this repository
2. Install dependencies:

   npm install
   

3. Create a .env file based on .env.example and add your Grok API key
4. Start the development server:

   npm run dev
   

Deploying to Vercel

1. Install the Vercel CLI:

   npm install -g vercel
   

2. Login to Vercel:

   vercel login
   

3. Deploy:

   vercel
   

4. Add environment variables in the Vercel dashboard:

   • Go to your project settings
   • Navigate to the "Environment Variables" section
   • Add GROK_API_KEY with your Grok API key

5. For production deployment:

   vercel --prod
   

Deploying to Heroku

1. Install the Heroku CLI and login:

   npm install -g heroku
   heroku login
   

2. Create a new Heroku app:

   heroku create zap-labs-backend
   

3. Set your environment variables:

   heroku config:set GROK_API_KEY=your_grok_api_key_here
   

4. Deploy:

   git push heroku main
   

API Endpoints

Health Check

• GET /
  • Response: { status: 'ok', message: 'ZAP Labs API server is running' }

Grok API Proxy

• POST /api/grok
  • Request body:

    {
      "prompt": "Your prompt text here",
      "options": {
        "model": "grok-beta",
        "max_tokens": 500,
        "temperature": 0.7
      }
    }

  • Response:

    {
      "success": true,
      "data": "Response from Grok API"
    }

Security Features

• CORS protection
• Rate limiting (60 requests per minute)
• Automatic retry logic with exponential backoff for rate-limited requests
• Security headers
• Environment variable protection for API keys