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Fix Cloudflare 521 Error on Nginx: Step-by-Step Guide - Fixing Node Sass Build Failures in package.json-Fix npm run build Failure from Missing Env Variables

Updated 2026-07-28 14:04:46developer-tools
Fix Cloudflare 521 Error on Nginx: Step-by-Step Guide - Fixing Node Sass Build Failures in package.json-Fix npm run build Failure from Missing Env Variables
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  • Match the tool to the workflow that fails most often, not only the feature list.
  • Keep export format, permissions, and automation limits in the final decision.

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