Basically, ngrok allows you to take any project live without actually deploying it.
It is a simple concept and maybe that is not the best explanat...
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Great writeup! ngrok and the likes are really powerful tools any webdev should have in their belt.
I was recently introduced to serveo.net, a free alternative, that I think is better than ngrok because:
ssh -R 80:localhost:3000 serveo.net
(replace 3000 with whatever port you want to "open")I'm not an export in network security, so ngrok might be a more secure choice, i don't know.