A very simple URL shortener.

pub get
dart bin/server.dart prep  # copy the auth token that is output
dart bin/server.dart <port>

Go to /_auth-<auth token> and it should redirect you to /_manage, where you can add or delete short links. Change [base] to configure where an empty path redirects to. Short links can be anything, provided they don't start with an underscore.

All short links (plus the auth token) are stored in data.json. Delete this if you want to clear all short links. Rerun the prep command to change the auth token. The short links will be left untouched.