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JSON FormatterDevToys
Free

Free and open source.

 Free

The open-source software is available without a license fee. Hosting, hardware and…

Browser extension Windows, macOS, Linux
  • Collapsible trees with indent guides and syntax highlighting
  • Toggle between raw and parsed JSON
  • Includes text conversion, formatters, encoders and validation tools.
  • Built as a Chrome extension; other browsers are not mentioned
  • Viewing only, not a JSON editor
  • Its small utilities do not replace a full development environment.
Browser extension Downloadable app
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.