What is the problem?
整理新手处理 port already in use 时的常见错误：乱杀进程、没确认端口来源、忘记旧终端、随便换端口、在客户服务器操作，并给出修正方法。
Quick solution
Treat this as a Node.js errors mistakes issue. First confirm the environment, inputs, permissions, logs, and delivery boundary. Then use the linked deep guide for the full checklist before changing production code or promising a result.
Read the deep guideDetailed steps
- Confirm the scenario, tool version, account permissions, inputs, and expected output before changing anything.
- Check configuration, logs, command output, and human review boundaries against the linked deep guide.
- Record the before and after result, then verify that the fix did not introduce platform, privacy, or delivery risk.
Commands or code
The issue appears to be a local port conflict. I will first identify what process is using the port before stopping anything. If the port belongs to a customer-managed service or server process, I will list it as a confirmation item instead of closing it directly.Risk notes
Confirm the real project environment, account permissions, platform rules, and output quality before delivery. Do not ship AI-generated changes without human review, and do not claim indexing, income, deployment success, or ranking improvements without measured evidence.