Compare software

JSON ViewerJSON Formatter
Free

Free and open source under the MIT licence.

 Free

Free and open source.

Browser extension Browser extension
  • API responses become readable in place, with collapsible nodes
  • Raw view remains available for copying
  • Collapsible trees with indent guides and syntax highlighting
  • Toggle between raw and parsed JSON
  • Chromium browsers only; Firefox has a built-in JSON viewer
  • Built as a Chrome extension; other browsers are not mentioned
  • Viewing only, not a JSON editor
Browser extension Browser extension
Open source Open source
License: MIT License not stated
Not stated if an account is needed No account needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked September 24, 2026

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