Structly makes JSON easy to read, in its own native viewer on iPhone, iPad and Mac, and right inside Safari.
A NATIVE JSON VIEWER
• Open files, paste text, or pick up where you left off with recent documents
• A clear tree with syntax colors, item counts and indentation guides
• Table view turns lists of objects, such as API results, into sortable columns
• Source view with syntax highlighting
• Numbers keep their exact spelling, even huge integers and precise decimals
FIND AND UNDERSTAND
• Search keys and values with highlighted matches, or show only the matches
• Jump straight to a path such as $.users[0].name
• The inspector shows readable dates for Unix timestamps and ISO 8601 dates, decodes URL and Base64 strings, and opens links
• Copy a value, key or JSON path with one tap…
From the developer’s store description.