The Basics
Put a locally running HTTP, HTTPS or TLS app on the internet
localhost.run is a client-less tool to instantly make a locally running application available on an internet accessible URL.
All major operating systems already have SSH installed, and localhost.run uses SSH as a client, so no download is necessary to use the service and no account setup is needed for free domains.
To connect an internet domain to an application running locally on port 8080 open a command terminal and run:
ssh -R 80:localhost:8080 localhost.run
ssh -R 80:localhost:3000 localhost.run