I assume your question is how to log data to the console and read it?
The issue you experience is due to Vue's Reactivity system, which extends objects with getter and setter methods to track changes and react to them.
However, When I log something to the console, it's usually quite readable. If you really need a plain output, you can use JSON.parse/stringify to create fresh, plain object.
I demo both things here: https://jsfiddle.net/x8nhrf0c/1/
Also, we recommend to use your devtools in Chrome or Firefox to inspect your component's data - it formats it nicely for you.