🔍 Domain Validator & DNS Lookup API

A high-performance, concurrent DNS lookup API built with Go and GoFiber. It provides detailed DNS records (A, AAAA, MX, NS, TXT, CNAME) and automatically detects the DNS provider (Cloudflare, AWS, Google, etc.).

🚀 Key Features

• ⚡ Concurrent Lookups: Queries all DNS record types in parallel using Goroutines for massive performance gains.
• 🏢 Provider Detection: Identifies ~50+ different DNS providers based on nameserver patterns.
• 🛡️ Reliability: Uses a custom resolver (Cloudflare 1.1.1.1) to bypass local OS resolution issues and ensure consistent low latency.
• 🐳 Docker Ready: Includes a multi-stage Dockerfile for a minimal (~15MB) production image.
• ✨ Clean Architecture: Modular and maintainable project structure, perfect for production or learning.

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🛠️ Installation

Using Go

# Clone the repository
git clone https://github.com/corenzy/domainvalidator.git
cd domainvalidator

# Install dependencies
go mod tidy

# Run the server
go run main.go

Using Docker

# Build and run with Docker Compose
docker-compose up --build -d

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📖 API Documentation

POST /lookup

Performs a full DNS lookup for a given domain.

Request Body:

{
  "domain": "google.com"
}

Successful Response:

{
  "success": true,
  "message": "DNS lookup completed for google.com",
  "lookup_time_ms": 145,
  "result": {
    "domain": "google.com",
    "provider": {
      "name": "Google Cloud DNS",
      "website": "https://cloud.google.com/dns"
    },
    "nameservers": ["ns1.google.com", "ns2.google.com"],
    "a_records": [
       { "type": "A", "value": "142.250.184.238" }
    ],
    "mx_records": [
       { "type": "MX", "value": "smtp.google.com", "priority": 10 }
    ],
    "txt_records": ["v=spf1 include:_spf.google.com ~all"]
  }
}

GET /

Returns the API status and minimal health check information.

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📂 Project Structure

.
├── main.go              # Entrypoint (Fiber setup, routes, middleware)
├── handlers/
│   └── lookup.go        # HTTP request handling & validation
├── services/
│   └── dns.go           # Core concurrent DNS resolution logic
├── providers/
│   └── providers.go     # Registry of ~50+ DNS providers
├── models/
│   └── models.go        # Shared request/response data structures
├── Dockerfile           # Multi-stage production build
└── docker-compose.yml   # Local orchestration

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🤝 Contributing

1. Fork the project.
2. Create your feature branch (git checkout -b feature/AmazingFeature).
3. Commit your changes (git commit -m 'Add some AmazingFeature').
4. Push to the branch (git push origin feature/AmazingFeature).
5. Open a Pull Request.

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.