JSON Assistant 4+

Beautiful JSON viewer/formatter for macOS. Paste or drop a file, beautify, explore the tree, and save snippets. Everything stays on-device for speed and privacy.

JSON Assistant is a fast, privacy-first JSON viewer and formatter for iOS and macOS.
Paste JSON, drop a file, or open from Share Sheet—then pretty-print, explore the tree, and save your snippets.
The UI uses a warm, high-contrast sepia theme that’s easy on the eyes without sacrificing legibility.

Why developers love it
• Instant Beautify and Compact views
• Clean tree explorer with Collapse/Expand All
• Raw ↔ Formatted side-by-side comparison.
• Saved snippets with names, timestamps, and quick delete
• Syntax highlighting tuned for readability
• On-device processing (no network) for speed & privacy

Great for
• Webhooks & API payloads.
• Server logs and debug output
• Inspecting large objects from the clipboard or files

Details
• Pretty-print and compact toggles
• Date/time stamps on saved entries
• Keyboard shortcuts
• Works offline; no account required

Privacy
All parsing happens on device. We do not collect your data.