Format Studio

JSON / YAML / Markdown の軽量エディタ

Only for Mac

$2.99

Mac

Open, format, fix, close. A lightweight editor for JSON, YAML and Markdown, for the moments that don't need a full IDE. Format Studio is a lightweight editor for quickly opening, checking and lightly fixing JSON, YAML and Markdown files. It is built for the moments when launching a full IDE is more than you need. When you work alongside AI agents, you end up opening config files, documents and scripts all day. Format Studio focuses on exactly that: open the file right away, format it, spot mistakes, edit it in a tree, and close it. Features - Syntax highlighting and syntax error display for JSON, YAML and Markdown - One-key formatting (2-space JSON; YAML keeps comments and anchors) - Tree view editing for JSON and YAML (add, remove and change keys and values, folding) - Live Markdown preview (split view, code highlighting, relative images) - Outline and file name filter to jump straight to what you need - Highlighting for shell scripts, batch files and HTML, with "Open in Browser" for HTML - Image viewing - GitHub-style light and dark themes, Japanese / English UI - Optional Vim key bindings - Drag and drop from Finder, file associations, restores the last folder and tabs - External change detection and atomic saves protect what you are editing What it does not do No project-wide search, no Git integration, no extensions, no settings screen. Lightness and instant launch come first. Privacy No network communication and no data collection. Runs in the App Sandbox and only touches the folders you open.

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The developer, Kazuki Watanabe, 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
    Kazuki Watanabe
    Size
    6.6 MB
    Category
    Developer Tools
    Compatibility
    Requires macOS 13.0 or later.
    • Mac
      Requires macOS 13.0 or later.
    Languages
    English and Japanese
    Age Rating
    4+
    Copyright
    © 2026 NeuralParadox (Kazuki Watanabe)
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.