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/

JSONViewer 1.1.0

Adds a row of text-transform tools with results shown in a line-numbered Output view (à la online-json.com).

New in 1.1.0

• JSON Escape / Unescape — Escape adds no outer quotes; Unescape strips matching outer quotes
• String UnEscape — general backslash unescape, keeps quotes
• BASE64 Encode / Decode
• URL Escape / Unescape — percent-encoding (RFC 3986 unreserved set)
• Gzip&BASE64Encode / BASE64Decode&Ungzip — real gzip via zlib, interoperable with the system gzip/gunzip
• Transform results render in a read-only, line-numbered output; editing input or running a JSON action returns to the JSON view

Also includes (from 1.0.0)

Format / Minify / Validate (line:col errors), syntax-highlighted text + collapsible tree view, JSONPath-subset extraction ($[*].id) into a separate window with Copy + Download.

Downloads

• JSONViewer-1.1.0.dmg — double-click, drag to Applications
• JSONViewer-1.1.0.zip — unzip and run

Notes

• Unsigned, arm64 (Apple Silicon) only. First launch: right-click → Open to bypass Gatekeeper.
• Built with swiftc (Command Line Tools only — no Xcode/SwiftPM). zlib linked via -lz.

JSONViewer 1.0.0

Native macOS JSON viewer/formatter with path extraction.

Features

• Format: Beautify (2 / 4 / Tab indent), Minify, Validate (with line:column error reporting)
• Viewer: syntax-highlighted text view + collapsible tree view, Text/Tree toggle
• Path extraction: JSONPath subset (e.g. $[*].id, $.a.b[*].x, [index], ['key']) — results open in a separate window with Copy and Download (.json/.txt)

Downloads

• JSONViewer-1.0.dmg — double-click, drag to Applications
• JSONViewer-1.0.zip — unzip and run

Notes

• Unsigned, arm64 (Apple Silicon) only. First launch: right-click → Open to bypass Gatekeeper.
• Built with swiftc (Command Line Tools only — no Xcode/SwiftPM required). See README for build_app.sh.