Jayson is a JSON viewer and editor for iPhone and iPad. Browse JSON as a structure, edit values, and save your changes back to the file.
Whether you're inspecting an API response, checking a config file, or making a quick fix on the go, Jayson turns raw JSON into something you can actually read and change.
BROWSE AND EDIT
- Open JSON files stored on your device or in iCloud Drive.
- Toggle between a structured table view and syntax highlighted text.
- Add new values and keys, and save your changes back to the file.
- Parse text or the contents of a URL from your clipboard into JSON.
- Highlight a key from a child of an array to get a quick overview of your data.
TABS, SPLITS, AND WINDOWS
- Switch between files, or different objects in a single file, using tabs.
- Compare JSON in a single file or across files using multiple splits.
- Open multiple windows on the iPad.
WORKS WITH SHORTCUTS
Jayson integrates with Shortcuts, which comes in handy for debugging API calls, previewing JSON files, and building workflows around JSON.
- Pass a response from Get Contents of URL to Jayson to see how it is structured.
- Open JSON as a document you keep working on, or as a temporary preview.
- Format JSON and hand the result to the next action, using spaces or tabs.
FREE, WITH AN OPTIONAL UPGRADE
Jayson's core functionality is free. Browsing, editing, saving, splits, Shortcuts, and working with up to two tabs at a time cost nothing.
A one-time in-app purchase enables having more than two tabs open at once, switching between light and dark themes, and personalizing the app icon, accent color and type icons.
One purchase, no subscription.
Last month's update to v1.5 was the first in over 4 years—always love to see updates like this especially to one of my favorite apps. The app wasn't broken or anything before despite being so out of date but was in need of a refresh given iOS 26 changes. This app is more relevant than ever with how popular JSON file type has become especially with AI. Excited to see what's next!
LOVE The App, NOT a Fan of a Recent Change..
ѕтeғαɴ
Jayson, my go-to tool for viewing and verifying JSON in Shortcuts development, has always been well-designed, reliable, and feature-packed. Its smooth, aesthetically pleasing, and intuitive UI extends these aspects to Shortcuts.However, my only complaint about the recent major update (v1.5.0) is the change to the ‘view JSON’ Shortcuts action. Before the update, this action allowed users to send or view input JSON to or in the App itself or via a notification. I used the notification option to open JSON text seamlessly, without interrupting my workflow. Shortcuts continued running, and I could view or exit JSON in the App anytime by tapping the notification. I could also preview JSON directly from the notification by long-pressing it.Unfortunately, the update removed the option to open JSON in a notification, making the only way to view JSON by leaving Shortcuts and opening the Jayson App. While this change doesn’t make the App unusable, it negatively impacts its implementation and overall utility for Shortcuts development.Lastly, I want to clarify: all new features/changes in the recent update are great! I’ll continue using Jayson in most future Shortcut builds.Despite my complaint, I highly recommend Jayson to anyone who regularly deals with JSON text on iOS, especially via Shortcuts.
I Am No Longer Afraid of JSON
NeoYokel
All of Simon’s apps are genius and wholly unique, but Jayson will always have a special place in mine own heart as the single application which finally killed my phobia of JSON, in general. It is by far the most elegant and intelligent means of manipulating JSON dictionaries I’ve ever seen on any platform. I’ve worked with both the iOS and macOS apps, now, and both are - dare I say it - a genuine joy to use. BUY!
I love this app!
FifiTheBulldog
I’m a power user of Shortcuts and (more recently) Scriptable, and on many occasions I need to work with JSON responses from APIs. This app is a lifesaver. It completely takes the guesswork out of the process of figuring out what keys I need to use to retrieve the data I need. I don’t know what I would do without Jayson. Bravo!
Brings small optimizations for iOS 27.
Version 1.5.3
The developer, Simon B. Støvring, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More