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fx vs jless: catalog facts
fx	jless
Free The open-source software is available without a license fee. Hosting, hardware and…	Free The open-source application is available without a license fee.
Windows, macOS, Linux, Command line	macOS, Linux, Command line
Lets you explore structured data without opening a separate editor.	Collapsible trees and regex search
Requires terminal use and valid input data.	Native Windows support is not yet available.
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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