JSON Datasource not returning any data

I am a new user of grafana and looking to setup some monitoring using some JSON supplied by azure. I’ve been using some very basic example JSON found online:

https://jsonplaceholder.typicode.com/todos/1

In order to play with the setup/options available in grafana, but i’m getting bombarded with 404 errors when attempting to load the query.

So when I create a query using the above address, it saves and tests successfully, but when i attempt to create a dashboard using said query, I am told by the UI that no data was returned from the query.

Looking in the dev tools, I’m presented with the following every time I pick the query:

Is there anything I’m missing here? I wondered if perhaps the JSON was in the wrong format?