When developing locally, the port number you want to use may still contain the process you used when you developed it earlier. Describe the coping method in such a case.
If you want to know the process running on localhost port 3000, use the following command.
Terminal
$ lsof -i :3000
com.docke 25316 takuya 41u \
IPv6 0xc293b929f41a59e9 0t0 TCP *:hbci (LISTEN)
As described above, the PID number of the process running on port 3000 can be grasped.
Here, the PID number is 25316, so stop the process as follows.
Terminal
$ kill -9 25316
-9 seems to be a forced termination option.
that's all
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