hoangnguyen0403/nestjs-file-uploads
skills/nestjs/nestjs-file-uploads/SKILL.md
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.
$ install --global
skillsauthnpx skillsauth add hoangnguyen0403/agent-skills-standard nestjs-file-uploadsInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
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OWASP Dep-Check
50%
Last scanned: May 19, 2026, 3:39 AM301.1s2 files scanned
SKILL.md
- name:
- nestjs-file-uploads
- description:
- 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.
File Upload Patterns
Priority: P0 (FOUNDATIONAL)
- Magic Bytes: NEVER trust
content-typeheader or file extension. - Tool: Use
file-typeormmmagicto verify actual buffer signature. - Limits: Set strict
limits: { fileSize: 5000000 }(5MB) in Multer config to prevent DoS.
Streaming (Scalability)
- Memory Warning: Default Multer
MemoryStoragecrashes servers with large files. - Pattern: Use Streaming for any file > 10MB.
- Library:
multer-s3(direct upload to bucket) orbusboy(raw stream processing). - Architecture:
- Client requests Signed URL from API.
- Client uploads directly to S3/GCS (Bypassing API server completely).
- Pro Tip: Only approach to scale file uploads infinitely.
Processing
- Async: Don't process images/videos in HTTP Request.
- Flow:
- Upload file.
- Push
FileUploadedEventto Queue (BullMQ). - 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.
References
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