JSON Loupe

Quick Look for JSON & JSONL

Only for Mac

Free · In‑App Purchases

Mac

Now free. Press Space on any JSON, JSONL or NDJSON file in Finder and read it properly — Pretty and Raw views, every file type, no charge. Pro adds Tree and Compact. Press Space on any JSON file in Finder and actually read it. Free. JSON Loupe adds a Quick Look preview for JSON and all its variants — including line-delimited .jsonl and .ndjson logs, which macOS otherwise shows as an unreadable wall of text. FREE, WITH NO CATCH The Quick Look preview itself, every supported file type, and both the Pretty and Raw views are free. No account, no trial, no nagging. • Pretty — indented and syntax-highlighted, with short objects kept on one line • Raw — the original bytes, colored in place, with exact file line numbers JSON LOUPE PRO — ONE-TIME $4.99 UNLOCK • Tree — collapse and expand any node; right-click to copy a value, a key, or its full key path • Compact — one colored line per record, ideal for scanning logs • Standalone viewer window — drop a file on the app and read it in its own window Bought JSON Loupe when it was a paid app? Pro is already yours, permanently. BUILT FOR REAL FILES • JSONL and NDJSON: every record is pretty-printed and numbered • Broken files stay readable: bad records are flagged inline with the exact line and column, and everything else still renders • Huge files open instantly — only the head is read, and a banner tells you exactly how much is shown • Embedded base64 images (like Jupyter notebook output) appear as inline thumbnails • URLs inside your JSON are clickable SUPPORTED FILE TYPES .json, .jsonl, .ndjson, .geojson, .jsonc, .json5, .har, .webmanifest, .ipynb and .map PRIVATE BY DESIGN No network access, no analytics, no data collection. Everything happens on your Mac.

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JSON Loupe is now free. Quick Look previews, every supported file type, and the Pretty and Raw views are free for everyone, forever. JSON Loupe Pro — a one-time $4.99 unlock — adds the collapsible Tree view with copy value / key / key path, the one-line Compact view, and the standalone viewer window. If you bought JSON Loupe before it went free, you already have Pro. It unlocks automatically, permanently, and you will never see a purchase prompt.

Version 1.1

The developer, Christian Weinmayr, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Christian Weinmayr
    Size
    • 313 KB
    Category
    • Developer Tools
    Compatibility
    Requires macOS 15.0 or later.
    • Mac
      Requires macOS 15.0 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Christian Weinmayr
  • Developer Website
  • Privacy Policy

    • More by Christian Weinmayr