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JSONLint vs Config File Validator: catalog facts
JSONLint	Config File Validator
Free The website is free to use.	Free Free and open source under the Apache 2.0 licence.
Web	Windows, macOS, Linux, Command line
Validates and pretty-prints in one step Accepts pasted JSON or a URL	Validates 18 formats with one command Schema validation with automatic SchemaStore lookup
Syntax checking only on the website, no schema validation The related CLI package has not been updated since 2022	Automatic fixes cover only some problems Formatting checks apply to a subset of the supported formats
Web application	Downloadable app
Closed source	Open source
License not stated	License: Apache-2.0
No account needed	No account needed
Needs internet	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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