skills/ HoangNguyen0403/agent-skills-standard

nestjs-file-uploads

Validate and stream file uploads securely with Validation and S3 streaming in NestJS. Use when implementing secure file uploads, validation, or S3 streaming in NestJS.

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2 files scannedscanner v1.2.0Oct 11, 2026

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SKILL.md

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File Upload Patterns

Priority: P0 (CRITICAL)

  • Magic Bytes: NEVER trust content-type header or file extension.
  • Tool: Use file-type or mmmagic to verify 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: Only approach to scale file uploads infinitely.

Processing

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

Anti-Patterns

  • No content-type trust: Always verify file magic bytes; MIME header can spoofed.
  • No MemoryStorage for large files: Use streaming or signed URL pattern for files > 10MB.
  • No synchronous file processing: Offload image/video work to BullMQ workers via FileUploadedEvent.

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