All of the notes section have an error related to a double / call to API. I replaced this
function createNote(note) { return API.post("notes", "/notes", { body: note, }); }
with this
function createNote(note) { return API.post("notes", "notes", { body: note, }); }
for everywhere there was a ‘/notes’ which wasn’t in the Routes.js
I honestly don’t know if this was the correct approach but it worked and fixed all of my headaches.