JSON Viewer

JSON Viewer is a native macOS application that presents JSON data in a structured, colour‑coded view, allowing users to expand and collapse nodes to explore large documents easily. It includes a single‑click option to prettify or minify JSON, and it highlights syntax errors automatically, helping users validate their data without leaving the editor.

The tool runs entirely on the local machine, requiring no internet connection, and it respects user privacy by avoiding any tracking or data transmission. Its interface follows macOS design conventions, supports dark mode, and adapts to the system appearance, providing a familiar experience for Mac users.

At under 5 MB, the app is lightweight and free of subscriptions or in‑app purchases. Built with Swift and Cocoa, it works on macOS 10.14 or later, offering a fast, offline solution for developers, data analysts, or anyone who needs to view, check, and reformat JSON files on a Mac.