Developer Tools

Jayson

By Simon B. Støvring

Jayson opens JSON as a structured table or highlighted text and saves edits on iPhone or iPad.

View on the App Store Official website

Our take

Consider it if you need to inspect or change a small configuration or API response away from a desktop.

Tabs, splits and Shortcuts support make comparing responses and passing formatted JSON back to a workflow easier.

Keep in mind: The free tier permits up to two tabs; customization and additional tabs need the upgrade. It is not an API testing suite.

Inside the app

Official product images

iPhone · US App Store

iPad · US App Store

What you can do

Browse and edit JSON values or keys
Compare documents or objects in split view
Preview and format JSON through Shortcuts

Good for

Developers and power users working with JSON on mobile

Consider alternatives for

Anyone wanting a full API client or source editor

Limitations & considerations

Captured minimum: iOS 26.0.
The free tier permits up to two tabs; customization and additional tabs need the upgrade. It is not an API testing suite.

Privacy & permissions

Files may be local or in iCloud Drive. Clipboard inputs, URLs and API responses can contain secrets; inspect what you open or share.

Sources & review notes Updated Nov 11, 2026

Reviewed by iApp4Me Editorial Team. Recommendations use the linked documentation and attributed accounts; device observations are identified separately.

US App Store developer description
Complete description, download price and compatibility metadata captured 2026-11-02.