While running some data validation methods against a JS object that was created by importing a JSON file the checkDataForExtraKeys validation has flagged a key called "default" as being unexpected. When a console.log is done against this object, sure enough, there is a key in it called "default" which contains all of the JSON content. Here is a simple example to demonstrate.
Why does the object made from JSON data have this "default" key? An object created directly in a JS file does not get such a key added automatically.
Is there a way to prevent the object created from the JSON data from having the "default" key added?