Problem
This error occurs in your nodejs project when you have a project that did not shut down properly. It will leave the port still running and used, so if you try to run again your Nodejs project you will get this error
Solutions
Method 1
First, we need to find the PID of the port associated with it. To find that we need to run this command:
sudo lsof -i :<port_number>
Then, we can now kill the process by using this command:
kill -9 <PID>
Method 2
We can also use the command for killing all the node process, to do that enter this command:
killall nodepkill node
Reference
https://levelup.gitconnected.com/how-to-kill-server-when-seeing-eaddrinuse-address-already-in-use-16c4c4d7fe5d
https://www.codegrepper.com/code-examples/whatever/Error%3A+listen+EADDRINUSE%3A+address+already+in+use+%3A%3A%3A80