Jayson
Simon B. Støvring Developer Tools iPhoneiPadiPod touch
Jayson is a free Developer Tools app for iPhone and iPad by Simon B. Støvring. Rated 4.5/5 from 448 ratings. Requires iOS 26.0. Updated September 10, 2026.
- Rating
- 4.5
- 448 ratings
- Price
- Free
- on the App Store
- Size
- 41 MB
- Age 4+
- Updated
- Sep 10
- 2026 · v1.5.3
Screenshots
About Jayson
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.
Ratings & reviews
4.5
448 ratings
What’s new
Version 1.5.3 · Updated September 10, 2026
Brings small optimizations for iOS 27.
App privacy
The developer, Simon B. Støvring, reported these privacy practices to Apple.
Data Not Collected
The developer does not collect any data from this app.
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| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| Jayson | 4.5 / 5 (448 ratings) | Free | September 10, 2026 | |
| Git client - Working Copy | 4.8 / 5 (3,793) | Free | Oct 29, 2026 | Compare |
| Debug Anywhere | 4.6 / 5 (55) | Free | Oct 27, 2026 | Compare |
| Supanator: Supabase Manager | 4.8 / 5 (24) | Free | Oct 27, 2026 | Compare |
| Swifty Compiler: Swift IDE | 4.5 / 5 (203) | Free | May 11, 2026 | Compare |
| Kodex | 4.2 / 5 (208) | Free | Apr 1, 2024 | Compare |
| Network Sniffer | 4.6 / 5 (198) | Free | Sep 12, 2026 | Compare |
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