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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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Jason User Discussion

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RobinH3367 Member IconReview+0

Work as expected! Thank you!

Reply0 replies
Version 0.6
alexandresoli Member IconReview+0

Work as expected!

Reply0 replies
Version 0.5
demonpants Member IconReview-1

Also couldn't open JSON files for me, so I edited info.plist to fix it. If you have that issue, you can get my fixed info.plist here:


It's just 2.5 kb, an XML document. Then show package contents on Jason.app and replace Contents/Info.plist with my file.

As for the actual review, the app is reasonably good. I like the built-in jsonlint and it's visually well executed, but not being able to copy/paste within the UI, among other limitations, keep this from being totally top notch.

Reply0 replies
Version 0.3
BigErnesto Member IconReview-2

right now it cannot open json files... how inconvinient for a json editor!

Reply1 reply
Version 0.3

Opens JSON files just fine for me.

user icon+0
Version 0.6
user icon+0
Version 0.6
user icon+19
Version 0.6
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Version 0.3
> 4 8


Current Version (0.x)


Downloads 14,569
Version Downloads 6,951
License Free
Date 15 Apr 2012
Platform Intel 64 / OS X / Intel 32
Price Free