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Something is already running on port 3000 React

I am getting this error when running command 'npm start' in React. But I have stopped my application first and then starting again. Why is it showing this error, Is there any way I can get rid of that.

1 Answers

Reason can be that your port - 3000 is not released. You can free the ports using commands in mac. Firstly, find the PID of port that needs to be released. If you want to find PID of port: 3000 the command will be

lsof -i :3000

This will list down the processes related to port 3000. From PID column copy PID and run below command

kill -9 PID
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