ngrok

ngrok is incredibly useful for publishing localhost servers as temporary publicly available sites

Install it on your path and then run e.g.

ngrok http 8080

If you are running a webpack-dev-server you'll [need to use]:(https://stackoverflow.com/questions/45425721/invalid-host-header-when-ngrok-tries-to-connect-to-react-dev-server):

ngrok http 8080 -host-header="localhost:8080"