Compare software

JSON FormatterJSON Viewer
Free

Free and open source.

 Free

Free and open source under the MIT licence.

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

Checked September 24, 2026

Checked September 22, 2026

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