nestjs-file-uploads

Included with Lifetime

$97 forever

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.

General

What this skill does

# File Upload Patterns

## **Priority: P0 (FOUNDATIONAL)**

- **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.

## References

Files: 2

Size: 3.5 KB

Complexity: 13/100

Category: General

Source: https://github.com/hoangnguyen0403/agent-skills-standard/tree/main/skills/nestjs/nestjs-file-uploads

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