throw er; // Unhandled 'error' event ^ Error: listen EADDRINUSE: address already in use :::9000 at Server.setupListenHandle code example

Example 1: EADDRINUSE: address already in use :::5000

sudo lsof -i :3000

Example 2: Error: listen EADDRINUSE: address already in use :::3000

ps aux | grep node
kill -9 PID