Quitting node.js gracefully

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I currently use Node’s event system to respond to signals. Here’s how I use the Ctrl-C (SIGINT) signal in a program:

process.on( 'SIGINT', function() {
  console.log( "\nGracefully shutting down from SIGINT (Ctrl-C)" );
  // some other closing procedures go here
  process.exit( );
})

You were getting the ‘Address in Use’ error because Ctrl-Z doesn’t kill the program; it just suspends the process on a unix-like operating system and the node program you placed in the background was still bound to that port.

On Unix-like systems, [Control+Z] is the most common default keyboard
mapping for the key sequence that suspends a process (SIGTSTP).[3]
When entered by a user at their computer terminal, the currently
running foreground process is sent a SIGTSTP signal, which generally
causes the process to suspend its execution. The user can later
continue the process execution by typing the command ‘fg’ (short for
foreground) or by typing ‘bg’ (short for background) and furthermore
typing the command ‘disown’ to separate the background process from
the terminal.1

You would need to kill your processes by doing a kill <pid> or ‘killall -9 node’ or the like.

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