JSONViewer 1.2.0

New in 1.2.0 — JSON Compare 🔍

A new Compare window: paste two JSON documents (A original / B compare) and get a structured tree diff:

• Added (green), Removed (red), Changed (orange, shown as old → new)
• A summary: N added · M removed · K changed
• Objects compared key-order-insensitively, arrays by index, numbers by canonical decimal value (exact for big integers beyond 2⁵³ — no floating-point collisions)
• Invalid JSON on either side shows an inline error, never crashes

Also includes (since 1.0)

Format / Minify / Validate (line:col errors), syntax-highlighted text + collapsible tree view, JSONPath extraction ($[*].id) to a separate window with Copy + Download, and 9 transform tools (JSON/URL escape, BASE64, real gzip).

Downloads

• JSONViewer-1.2.0.dmg — double-click, drag to Applications
• JSONViewer-1.2.0.zip — unzip and run

Notes

• Unsigned, arm64 (Apple Silicon) only. First launch: right-click → Open.
• Landing page: https://kg1990.github.io/json_viewer/