Dmime

A fast and efficient library to detect a given file's MIME type based on the file content regardless of file extension.

• Written in .NET 7
• No Dependencies
• No Reflection
• Easy to Use
• Supported Types
  • MP4
  • BMP
  • GIF
  • JPEG
  • PNG
  • WEBP
  • PDF
  • MP3
  • EMF
  • TIFF
  • ICO
  • WMF

How to Use

Extension Method

Install the DMime package:

dotnet add package Dmime

Then use the DetectMimeTypeAsync or DetectMimeType extension methods on any Stream type.

    // an unkown file without extension
FileStream stream = File.OpenRead("webp-sample-550w-404h");

var result = await stream.DetectMimeTypeAsync(); // result = image/webp

Dependency

Install the Dmime.Extensions.MicrosoftDependencyInjection package:

dotnet add package Dmime.Extensions.MicrosoftDependencyInjection

Register the dependency into ASP.NET Core DI container:

services.AddMimeDetector();

Then inject the IMimeDetector to your desired class and use the DetectAsync or Detect methods accordingly.

  [ApiController]
  [Route("[controller]")]
  public class UploadController
  {
      private readonly IMimeDetector _mimeDetector;
  
      public UploadController(IMimeDetector mimeDetector)
      {
          _mimeDetector = mimeDetector;
      }
  
      [HttpPost]
      public async Task<IActionResult> SendNotification(IFormFile formFile)
      {
          var streamContent = formFile.OpenReadStream();
                  
          var result = await _mimeDetector.DetectMimeTypeAsync(streamContent);
  
          return Ok(result);
      }
  }

Sponsor

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