JSON Editor is a beautiful viewer and editor for JSON data. It allows you to create, visualize, modify, validate, format and save your JSON documents.
The app has the smarts needed to make the minimum changes when editing a file, even in the "outline" mode.
This is especially useful when you keep the files in a repository, because only the relevant changes will be shown when diff-ing the edited files.
MAJOR FEATURES
• View and edit your JSON documents in "outline" (aka "tree") or "text" modes
• The "outline" mode offers a great and error proof way to manipulate your JSON, by allowing you to easily add, reorder, delete, copy & paste the items
• The "text" mode offers a quick way to interact with the raw text which makes up the JSON and to investigate invalid JSONs…
From the developer’s store description.