File Upload

How I solve File Upload problems: articles, case studies, and guides on migrating from File Upload to scalable platforms.

Case Studies

Uploading 150 MB Audio Files to S3 Without Killing the Server

A direct-to-S3 multipart upload pipeline for large audio — presigned URLs, client-driven parts, and a worker that finalizes assembly. Zero bytes touch the app server.

Result Server memory flat (~120 MB) regardless of file size; ~300 MB uploads in under a minute on a 1-core box; resumable after drops.

TypeScript
Express
React
S3/R2
AWS SDK v3