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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.
Can you view two different arrays on the same split? I feel like you should be able to… side by side is enabled in landscape… but it seems again only for the same array. You can drag and drop one though to a different position so it’s almost there, assuming I’m not just missing how to do it.
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!
Using the heck out of this
Rgxyzzy
I’ve been using the heck out of this lately so decided to go for the paid version even though I don’t particularly need the extra features. This app has saved me a ton of time. It’s great looking through the JSON on my iPad while coding on my MBP.
Jayson has been rebuilt for iOS 26.
Design
- A fresh look throughout, including the tab bar, toolbars and menus.
- App icons now include dynamic ones that follow light, dark and tinted appearances.
- Expand objects and arrays in place to see their contents without navigating into them.
- A redesigned editor for changing values.
- Native menus for toolbar and editor actions.
Shortcuts
- View JSON takes a file or text and opens it as a document you keep or a preview you dismiss when you are done.
- Format JSON uses spaces or tabs and hands the result to the next action.
Settings
- Reorganized and easier to navigate.
- Tabs Placement: put the tabs at the top or the bottom.
- Type Display: show the type in front of a key or under it.
- Line Wrapping and a font picker for the plain text view.
Jayson 1.5 requires iOS 26.
Version 1.5.0
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