Find (and kill) process locking port 3000 on Mac

  1. You can try netstat netstat -vanp tcp | grep 3000
  2. For macOS El Capitan and newer (or if your netstat doesn’t support -p), use lsof lsof -i tcp:3000
  3. For Centos 7 use: netstat -vanp --tcp | grep 3000

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