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How to Fix npm Run Build Failed Error - npm package.json Not Found: Troubleshooting Checklist-Resolve Cloudflare 521 Error on Apache

2026-07-28 14:07:57
How to Fix npm Run Build Failed Error - npm package.json Not Found: Troubleshooting Checklist-Resolve Cloudflare 521 Error on Apache

Result check

  • Keep one change per test run so you know which step helped.
  • Undo temporary changes after the issue is confirmed.