Here is a curated list of highly important, critical, and technically challenging issues you can raise to elevate the platform from a basic project to an enterprise-grade application. They are categorized by difficulty.
Description: Implement client-side encryption. The file must be encrypted in the browser (e.g., using WebCrypto API or libsodium) before it is sent to the server. The server stores encrypted blobs and has absolutely no way to read the file. Decryption happens on the client side when a user enters the share password. Why it's critical: True privacy is mandatory for modern file-sharing applications (like Mega or ProtonDrive). This completely prevents data breaches if the server is compromised.
Description: Currently, uploading a 5GB file will likely crash the browser or timeout the server. Implement a chunked upload system (e.g., using TUS protocol) where files are split into 5MB chunks. Users can pause, resume, and recover from network failures without restarting the upload. Why it's critical: Crucial for user experience when handling large media files or unstable network connections.
Description: Decouple the application from Cloudinary. Build a generic StorageService interface and implement adapters for AWS S3, Cloudflare R2, and local disk. The system should be able to distribute files across multiple storage buckets based on regional proximity to the user.
Why it's critical: Cloudinary is expensive for raw file storage. Moving to an S3-compatible API ensures massive scalability and vendor flexibility.
Description: Implement a background worker queue (using Redis + BullMQ). When a file is uploaded, its status is set to scanning. A background worker runs the file through ClamAV (or an external API) to check for malware. The file can only be shared if the status becomes safe.
Why it's critical: Public file-sharing platforms are massive targets for malware distribution. You must protect people who download shared files.
Description: Transition from a single-user model to a Team model. Users can create "Organizations" and invite other users as Admin, Editor, or Viewer. Implement collaborative folders where multiple people can upload and manage files simultaneously.
Why it's critical: File sharing is rarely a solo activity. Teams need shared drives to collaborate effectively.
Description: Replace HTTP polling with WebSockets (Socket.io). If User A deletes a file or changes a folder name, User B (who is viewing the same folder) sees the UI update instantly without refreshing the page. Why it's critical: Provides the premium, "live" feel expected from modern web applications like Google Drive.
Description: Allow users to secure their accounts using an Authenticator app (TOTP algorithm). Generate QR codes for setup and require the 6-digit pin during login if 2FA is enabled. Why it's critical: Passwords get compromised. 2FA is the industry standard for protecting user data.
Description: Instead of forcing users to download .mp4, .mp3, or .pdf files, implement range-requests on the backend so media can be streamed directly in the browser. Generate thumbnails for image files to display in a gallery view.
Why it's critical: Massively improves user experience for recipients of share links.
Description: Track the bandwidth (GBs downloaded) per user/share link. Implement express-rate-limit to block IP addresses that hit the API too fast, and automatically suspend share links that exceed a 50GB daily download quota to prevent massive server bills.
Why it's critical: Without quotas and rate limits, a single viral share link can bankrupt your server hosting costs or take down your API.
Description: Use the HTML5 File System API to allow users to drag and drop entire folders from their desktop into the browser. Recreate the folder hierarchy in the database automatically. Why it's critical: Uploading complex project folders file-by-file is incredibly tedious.