launchd config file for NorthWatcher: https://github.com/samsonjs/NorthWatcher

net.samhuri.northwatcher.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>KeepAlive</key>
    <dict>
      <key>SuccessfulExit</key>
      <false/>
    </dict>
    <key>Label</key>
    <string>net.samhuri.northwatcher</string>
    <key>ProgramArguments</key>
    <array>
        <string>/usr/local/bin/node</string>
        <string>/usr/local/bin/northwatcher</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>UserName</key>
    <string>sjs</string>
    <key>WorkingDirectory</key>
	<string>/Users/sjs</string>
    <key>StandardErrorPath</key>
    <string>/var/log/northwatcher.log</string>
    <key>StandardOutPath</key>
    <string>/var/log/northwatcher.log</string>
  </dict>
</plist>