The Idempotency Bug That Spammed dev.to's API for Weeks

This article was originally published on Jo4 Blog . We built a small tool to keep our dev.to posts in sync with our markdown source files. Write locally, push to Git, and the tool updates dev.to if anything changed. Simple. One morning, we noticed dev.to showing "Updated 2 hours ago" on an article we hadn't touched in weeks. Then we checked the logs. Every article with an updatedAt field in its frontmatter was being republished. Every. Single. Day. How the Sync Works The tool is straightforward: