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JSON FormatterOK JSON
Free

Free and open source.

 Paid

Sold through the Mac App Store and as a direct download; the research does not list the…

Browser extension macOS
  • Collapsible trees with indent guides and syntax highlighting
  • Toggle between raw and parsed JSON
  • Opens clipboard JSON instantly, even when malformed
  • jq, JSONPath and JavaScript queries built in
  • Built as a Chrome extension; other browsers are not mentioned
  • Viewing only, not a JSON editor
  • macOS only
  • Pricing not stated on the homepage
Browser extension Downloadable app
Open source Closed source
License not stated License not stated
No account needed No account needed
Not stated if it works offline Works offline

Checked September 24, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.