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Phase 5 · Express.js & Web Frameworks

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File Upload Service

Part of the Backend Developer Roadmap.

Summary

A dedicated service for accepting, validating and storing file uploads — practice for Multer, file validation, and cloud storage integration.

How to Learn This

  • 1Accept uploads with Multer and validate file type/size before saving.
  • 2Upload files to cloud storage (S3 or equivalent) instead of local disk.
  • 3Return a public or signed URL for each uploaded file.

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