Do you know a good sample of howto read an JSON API from an localhost adress like: localhost:5050
And read the output of the json api it with elm/json and an simple JSON Decoder?
localhost:8000?
The elm guide is good place for starters: https://guide.elm-lang.org/
For JSON Decoders examples specifically, have a look here: https://guide.elm-lang.org/effects/json.html