Agent skill

NestJS File Uploads

Secure file handling, Validation, and S3 streaming.

View SKILL.md on GitHub Repository
Stars 163
Forks 31

Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/file-uploads

Metadata

Additional technical details for this skill

labels
nestjs upload multer s3
triggers 
{
    "files": [
        "**/*.controller.ts"
    ],
    "keywords": [
        "FileInterceptor",
        "Multer",
        "S3",
        "UploadedFile"
    ]
}

SKILL.md

File Upload Patterns

Priority: P0 (FOUNDATIONAL)

Secure file upload handling with validation and storage patterns.

  • Magic Bytes: NEVER trust content-type header or file extension.
    • Tool: Use file-type or mmmagic to verify the actual buffer signature.
  • Limits: Set strict limits: { fileSize: 5000000 } (5MB) in Multer config to prevent DoS.

Streaming (Scalability)

  • Memory Warning: Default Multer MemoryStorage crashes servers with large files.
  • Pattern: Use Streaming for any file > 10MB.
    • Library: multer-s3 (direct upload to bucket) or busboy (raw stream processing).
    • Architecture:
      1. Client requests Signed URL from API.
      2. Client uploads directly to S3/GCS (Bypassing API server completely).
      3. Pro Tip: This is the only way to scale file uploads infinitely.

Processing

  • Async: Don't process images/videos in the HTTP Request.
  • Flow:
    1. Upload file.
    2. Push FileUploadedEvent to Queue (BullMQ).
    3. Worker downloads, resizes/converts, and re-uploads.

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