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Jason is a JSON viewer and editor for Mac OS X. It can open local documents as well as download JSON data via HTTP and, in case of invalid data, an error message is presented and the line containing the error is highlighted.

What's New

Version 0.6:

New features

  • Object (dictionary) entries match the order of the original JSON data
  • Rows can be reordered via drag and drop
Parser is now based on SBJSON v3.1alpha3
  • Keyboard shortcut to alternate between outline and text matches Xcode 4's


  • OS X 10.7 or later*Previously available here

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4 8


Current Version (0.x)


Downloads 15,072
Version Downloads 7,454
License Free
Date 15 Apr 2012
Platform Intel 64 / OS X / Intel 32
Price Free