JSON Viewer
What JSON Viewer is
JSON Viewer is a native macOS app for viewing, validating, and formatting JSON datasets. Syntax highlighting improves readability, while expandable and collapsible nodes help navigate large structures. One-click controls prettify JSON for a formatted layout or minify it, and invalid syntax is highlighted automatically. The app processes data on the Mac and works offline. Its maker says there is no tracking or data mining. The interface is built with Swift and Cocoa, supports dark mode, and follows the system appearance. The download is less than 5 MB. Version 2.0.0 requires macOS 26 or later; version 1.2.2 is offered for macOS 10.14 or later. JSON Viewer is free, with no subscription or in-app purchases, and macOS is the listed platform. The site provides a support and feedback contact link and says the app was made in Montreal. Offline local processing makes it suitable for inspecting JSON without sending datasets to an online service.
Who it suits
JSON Viewer suits Mac users who need a compact tool for reading, checking, and reformatting JSON locally. It is also useful when offline work and no stated tracking matter.
What it does well
- Syntax highlighting for JSON
- Expand and collapse large data nodes
- Prettify or minify in one click
- Automatic invalid-syntax highlighting
- Offline local processing
What to know first
- Version 2.0.0 requires macOS 26 or later
- Only macOS is listed
- No free trial is offered
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | 100% free · no subscription or in-app purchases · download under 5 MB | Free |
As jsonviewer.app lists them, read 4 Oct 2026. The maker's own page has the final word.
Verdict
JSON Viewer focuses on straightforward local JSON inspection with validation and formatting controls. Its small download, offline operation, and free pricing are balanced by macOS version requirements.
Facts from JSON Viewer's own pages
- Appearance
- The app supports dark mode and follows the system appearance. · jsonviewer.app, 4 Oct 2026
- Current requirement
- Version 2.0.0 requires macOS 26 or later. · jsonviewer.app, 4 Oct 2026
- Download size
- The download is less than 5 MB. · jsonviewer.app, 4 Oct 2026
- Formatting
- The app can prettify or minify JSON in one click. · jsonviewer.app, 4 Oct 2026
- Maker location
- The site says the app was made in Montreal. · jsonviewer.app, 4 Oct 2026
- Navigation
- Users can expand and collapse nodes to navigate large datasets. · jsonviewer.app, 4 Oct 2026
- Offline use
- The app works offline and processes everything on the Mac. · jsonviewer.app, 4 Oct 2026
- Older macOS support
- The maker offers version 1.2.2 for macOS 10.14 or later. · jsonviewer.app, 4 Oct 2026
- Privacy
- The maker says the app has no tracking or data mining. · jsonviewer.app, 4 Oct 2026
- Purpose
- JSON Viewer is a native Mac app for visualizing, validating, and formatting JSON datasets. · jsonviewer.app, 4 Oct 2026
- Support
- The site provides a support and feedback contact link. · jsonviewer.app, 4 Oct 2026
- Syntax highlighting
- It uses syntax highlighting to make JSON easier to read. · jsonviewer.app, 4 Oct 2026
- Technology
- The native Mac UI is built with Swift and Cocoa. · jsonviewer.app, 4 Oct 2026
- Validation
- The app highlights invalid JSON syntax automatically. · jsonviewer.app, 4 Oct 2026
Where JSON Viewer stands on Freedom251
- JSON Tools#25 of 29