A simple and efficient URL shortener service built with ASP.NET Core 10, featuring a web UI and a REST API. It uses SQLite for storage and Sqids for generating short, unique identifiers.

• URL Shortening: Create short links for long URLs.
• Custom Expiry: Set expiration dates for shortened links.
• Automatic Cleanup: A background worker automatically removes expired links every 24 hours.
• REST API: Minimal API endpoint for programmatic URL shortening.
• Web UI: User-friendly Razor Pages interface for manual shortening.
• OpenAPI Support: Integrated Swagger/OpenAPI documentation (available in development).
• Validation: Robust request validation using FluentValidation.

• Framework: ASP.NET Core 10 (Razor Pages & Minimal APIs)
• Database: SQLite (Entity Framework Core)
• URL Encoding: Sqids
• Validation: FluentValidation
• API Documentation: Microsoft.AspNetCore.OpenApi

• .NET 10 SDK

1. Clone the repository:

   git clone https://github.com/your-username/UrlShortener.git
   cd UrlShortener

2. Run the project:

   dotnet run --project UrlShortener

3. Open your browser and navigate to https://localhost:5001 (or the port specified in the output).

• Endpoint: POST /api/create
• Request Body:

  {
    "fullUri": "https://www.example.com/very-long-url",
    "expiresAt": "2026-12-31T23:59:59Z"
  }

• Response:

  {
    "shortenedUrl": "abc123"
  }

• Endpoint: GET /{sqid}
• Description: Redirects to the original URL associated with the provided sqid.

• UrlShortener/Presentation: Contains API endpoints and models.
• UrlShortener/Infrastructure: Database context and entity models.
• UrlShortener/Services: Business logic, including SqidService.
• UrlShortener/Workers: Background tasks like CleanupWorker.
• UrlShortener/Pages: Razor Pages for the web UI.
• UrlShortener/Validations: FluentValidation validators.

The application uses SQLite. The database file urlshortener.sqlite is automatically created on the first run.

This project is licensed under the MIT License.