====== Find (and kill) process locking port 3000 on Mac and Linux ======




==== 1. You can try netstat ====


 <code>netstat -vanp tcp | grep 3000</code>


==== 2. For macOS El Capitan and newer (or if your netstat doesn't support -p), use lsof ====


 <code>lsof -i tcp:3000 </code>


==== 3. For Centos 7 use: ====


 <code>netstat -vanp --tcp | grep 3000</code>





Then you can kill the process like that:

<code>kill {pid_of_process}</code>