Dear god why? People using ports (even on ::1) is super annoying when it collides with development. Hunting down the offender is not always straightforward and introduces a new failure mode for you (when I’m already using that port for something else). Also, it opens the door for literally any other software (or xss attacks) to connect and issue api calls you may not expect.

Just create a native app. Use something like C# MAUI or whatever language you’re familiar with. Your users will thank you for a smooth experience.