MDN URL

https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/JSON

What specific section or headline is this issue about?

access of members of the json stucture

What information was incorrect, unhelpful, or incomplete?

Ofcourse hero["members"] is proper syntax but so is hero.members. The later much preferred as it uses object member access which is better readable and better documentable.
Suggest to update all the example access codes.

What did you expect to see?

use of object.member access syntax in stead of object["member"] syntax. It blur the border between arrays and objects confusing an apprentice.

Do you have any supporting links, references, or citations?

https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects

Do you have anything more you want to share?

No response

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