Go Team Ditches Swagger UI for Scalar to Fix Broken API Docs on Staging

A backend engineering team switched from Swagger UI to Scalar after discovering their API documentation was outdated and misconfigured, sending test requests to localhost instead of the correct staging server. The core problem stemmed from Swagger's annotation-based approach, where Go struct refactors often left magic comments out of sync, causing misleading documentation. Swagger UI's aging interface also made testing JWT-authenticated endpoints and navigating large API surfaces cumbersome for both developers and QA. The team consolidated all API contracts into a single openapi.yaml file and used Scalar's relative server URL configuration, which automatically targets whichever host is serving the docs page. The switch eliminated environment-specific URL mismatches, removed a heavy npm build step from CI, and simplified static asset embedding in the Go binary.