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JSONLint vs JSON Formatter: catalog facts
JSONLint	JSON Formatter
Free The website is free to use.	Free Free and open source.
Web	Browser extension
Validates and pretty-prints in one step Accepts pasted JSON or a URL	Collapsible trees with indent guides and syntax highlighting Toggle between raw and parsed JSON
Syntax checking only on the website, no schema validation The related CLI package has not been updated since 2022	Built as a Chrome extension; other browsers are not mentioned Viewing only, not a JSON editor
Web application	Browser extension
Closed source	Open source
License not stated	License not stated
No account needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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