A small Mac utility for the moment you paste in a wall of minified JSON and need to actually read it. Format it, validate it, sort the keys — locally, with nothing uploaded anywhere. Pasting a payload into a website you don't control is a habit worth breaking.
Screenshots
What it does
Format how you like it
Indent by 2, 4, 6 or 8 spaces, pretty-print, and sort keys for a stable diff-friendly view.
Validation with instant feedback
Malformed JSON is caught as you go, so you find the stray comma without hunting for it.
Cleans up escaped payloads
Strip escaping slashes to make JSON that arrived wrapped in a string legible again.
Nothing leaves your Mac
All parsing and formatting happens locally. No data collected, sent or saved — which matters when the payload is a production response.
Details
- Version
- 1.0.6
- Updated
- 2 August 2026
- Price
- Free
- Platform
- Mac
- Requires
- macOS 26.0
- Size
- 1 MB
- Category
- Developer Tools
- Languages
- EN
What's new in 1.0.6
Small improvements. The app is now open sourced.
Questions
Is any of my JSON uploaded?
No. There is no network call at all — it works with the Wi-Fi off.
Is there an iPhone version?
Not currently. This one is Mac-only, where pasting JSON around is the common case.