JSON Viewer
JSON Viewer: A focused free Mac app for readable, validated JSON without an internet connection. Ranked #26 of 29 in JSON Tools by our editors (6.4/10); pricing: Free plan; best for offline JSON viewing on macOS.
At a glance
- Editor score6.4 / 10
- PricingFree plan
- Best forOffline JSON viewing on macOS
- Free planYes
- Paid fromFree
- Facts checked21 Sep 2026
Where it wins
- Syntax highlighting and expandable JSON nodes
- Prettification, minification, and syntax error highlighting
- Offline local processing with dark mode support
Where it doesn't
- Runs only on macOS
- Requires macOS 26 or later
- Does not provide schemas, querying, or diffing
Our verdict on JSON Viewer
JSON Viewer is a free native macOS application for viewing, formatting, and validating JSON datasets. It suits developers and other Mac users who need to inspect structured data locally, expand and collapse nested nodes, and quickly switch between readable and compact JSON. The interface supports syntax highlighting, dark mode, and automatic highlighting for invalid syntax, while the app is built with Swift and Cocoa.
Its strongest focus is local JSON inspection. Offline processing keeps the work on the Mac, and the combination of syntax-highlighted visualization, expandable nodes, prettification, and minification covers the core tasks involved in reading and cleaning JSON. Automatic invalid-syntax highlighting adds a direct way to identify formatting problems before working with a document. This makes JSON Viewer a practical fit for users who value a focused desktop utility rather than a broader data workspace.
The Free plan includes JSON visualization, JSON formatting, syntax validation, and offline processing, with no subscription or in-app purchases. The current requirement is macOS 26 or later, which limits its use to compatible Macs and excludes users on other desktop or mobile platforms. JSON Viewer also stays narrower than tools that provide schemas, querying, or diffing. Choose it for straightforward offline JSON work on macOS; choose an alternative if cross-platform access or advanced JSON analysis is central to your workflow.
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JSON Viewer pricing
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JSON Viewer fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Schema validation | Not verified |
| JSONPath querying | Not verified |
| jq querying | Not verified |
| Batch processing | Not verified |
| JSON diff and compare | Not verified |
| Available platforms | macos |
| Deployment | Desktop |
| Platforms | macOS |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan (source) |
| Website | jsonviewer.app |
| Facts checked | 21 Sep 2026 |
Alternatives to JSON Viewer
- BracketViewA broad JSON toolkit with querying, schemas, diffs, snapshots, and webhook testing.9.4
- JSON CrackA broad, free toolkit for visualizing, querying, validating, and converting structured data.9.2
- jsonfmt.devA broad JSON toolkit with local browser processing, API access, and a $9 one-time Pro plan.9.0
See all JSON Viewer alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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