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

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