[Vuejs]-Localhost:3000 is not working properly in windows while creating a reactjs app with CRA

EDIT 2 : netstat -ano | findstr :3000
tskill typeyourPIDhere

Use tskill in windows cmd vs taskkill on git-bash

EDIT: Try wmic process where name="[process name]" call terminate / delete

Off the top of my head, try changing CRA port to something else?

https://scriptverse.academy/tutorials/reactjs-change-port-number.html

Try one of these methods, and see if they help you at least run CRA.