Assumes you have node v10+ installed on your computer https://nodejs.org/en/download/
npm i
node index.js
3) To add a new Uri to the "database", navigate to http://localhost:8000/shorten?uri=[someurihere]
It will return the shortened link as part of a json
4) To navigate to the uri you just added, simply copy and paste the short-uri received in the reponse from the preeevious step
You will be redirected to that page assuming the uri exists and is accessible.