Healthtech Avatar Handoffs in Node.js — Presigned S3-Compatible Storage

Node.js applications should utilize presigned URLs for S3-compatible storage to handle avatar handoffs and AI-generated images. This architecture allows browsers to upload directly to object storage, removing image bytes from the application server while maintaining authorization. Developers must avoid public-read ACLs, instead using private keys and short-lived URLs with content-type constraints. By implementing access-control at the application layer and verifying objects before database recording, systems ensure secure, replaceable data management and efficient delivery.