launchd file to keep ngrok alive; requires you have an ngrok config file with your connection definitions

io.ngrok.client.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>Label</key>
    <string>io.ngrok.start</string>
    <key>KeepAlive</key>
    <true/>
    <key>ProgramArguments</key>
    <array>
      <string>/usr/local/bin/ngrok</string>
      <string>start</string>
      <string>--all</string>
    </array>
    <key>StandardOutPath</key>
    <string>/tmp/ngrok.log</string>
    <key>StandardErrorPath</key>
    <string>/tmp/ngrok.log</string>
  </dict>
</plist>

• Save in /Library/LaunchDaemons
• Register it with: sudo launchstl load /Library/LaunchDaemons/io.ngrok.client.plist

sudo launchstl load /Library/LaunchDaemons/io.ngrok.client.plist

The command required is launchctl as opposed to launchstl

sudo launchctl load /Library/LaunchDaemons/io.ngrok.client.plist

Thanks for sharing! 🍻