By Simon B. Støvring

  • Category: Developer Tools
  • Release Date: 2019-12-10
  • Current Version: 1.4.1
  • Adult Rating: 4+
  • File Size: 6.41 MB
  • Developer: Simon B. Støvring
  • Compatibility: Requires iOS 10.15 or later.


Jayson is a simple yet powerful JSON viewer and editor. Features include: - Browse JSON files stored on your device. - Toggle between viewing JSON in a table or as syntax highlighted text. - Tabbed interface to quickly switch between files or different objects in a single file. - Use multiple splits to easily compare JSON documents in a single file or across multiple files. - Parse text or the contents of a URL in your clipboard to JSON. - Share Sheet action for parsing JSON from plain text and loading JSON from a link, - URL schemes for parsing a text, loading the contents of a link as JSON or parsing the contents of your clipboard. - Highlight a key from a child of an array to quickly get an overview. Features that require the "Unlock Everything" in-app purchase: - Switch between light and dark themes. - Changing the visual appearance, including the app icon, accent color and type icons. - Opening more than two tabs.



  • Not ideal for Big Sur

    By informatrex
    Not here to tear the app down...it looks like it is quite well done and useful to most, but just an fyi for the Big Sur users. It looks like it is a bit buggy. Screens weren't opening and appear to be hanging or the action for creating a file and opening it are different. For instance, open file doesn't give you an option to create a folder, then create a file in that folder.
  • Good but could use a filter or search feature

    By RicanGoat
    I just downloaded this json viewer and one thing is missing is a filter or search feature.
  • I want to love it, but it crashes.

    By FifiTheBulldog
    I love Jayson on iOS. Unfortunately, this Catalyst version just doesn't perform like the iOS version does. It crashes whenever I navigate too much through a complex JSON, which is exactly why I need Jayson in the first place. It's a hindrance to my workflow. If it didn't crash so much, I'd give it five stars. I had high hopes for this app on macOS, but it can't last through normal sessions of usage without crashing time after time. I'm disappointed to say the least.
  • Love the iOS App, But This Needs Work

    By ѕтeғαɴ
    I love Jayson on iOS so I decided to try the mac version and, unfortunately, it's been relatively unstable for me. Often freezes, which usually requires the app to be force-quit, when handleing moderately large JSON files. Also, it crashes all the time when when trying to open files when Jayson isn't already running.
  • Crashes too Often

    By Carl in Oakland
    I would really like this, but it seems to aways want to crash while I'm editing. Also there's no way to copy and paste lines as children of other lines. I'll keep looking.
  • Super helpful. Hot reloads are perfect for what I need!

    By deli%9OKRA'4
    I opened a JSON file to debug an Array. In my code, I can re-write the debug to JSON and the Jayson application will hot reload. Thank you!
  • Good JSON Viewer

    By karlostjackal
    The UI could use some improvement. Expectations: (a) Clicking on a table row should show me its contents; instead, a double-click is required. (b) instead of using a simple table, a table using drop-triangles is more readily understood; (c) using multiple windows instead of multiple tabs makes the different files easier to find.
  • Absolutely wonderful

    By David Steven K
    It's tough to say how good this app really is. If you at all need to understand your JSON payload, this thing will slice and dice it any way you need to get a clear handle on it. I would've been debugging for at least another couple of hours without it ... today alone! Huge time saver and absolutely beautiful design. Thank you!
  • good, not great

    By rtphokie
    The highlight text view is good, table view is a nice, unique feature. The lack of a tree view makes navigation cumbersome.
  • Good, but a few annoying bugs

    By Jmoreland
    I have used this app in the past. I like the new UI a lot better, but I have trouble with the app crashing when trying to edit the plain text. I used to use this app alot when debugging jSON from a website so I could see the relationships more clearly. I wasn't able to do basic editing like select-all or pasting without it crashing. I had to paste it into a new file adn save as a jSON file on the desktop in order to inspect the contents. I know a recent update can be hard to iron out edge cases like mine probably is, so I'm hopeful for a more stable release soon.