request.json -> request.get_json()

Apparently, the json method of request is considered deprecated, src https://stackoverflow.com/questions/20001229/how-to-get-posted-json-in-flask
So swallep it out for request.get_json

backend/main.py

@@ -13,7 +13,7 @@ def load():
 def deposit():
    #Request .json, store json
    if request.isJson():
-      request.json.
+      request.get_json()