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CUE vs Config File Validator: catalog facts
CUE	Config File Validator
Free Free and open source under the Apache 2.0 licence.	Free Free and open source under the Apache 2.0 licence.
Windows, Command line	Windows, macOS, Linux, Command line
Validates JSON and YAML against constraints Reduces boilerplate in large configurations	Validates 18 formats with one command Schema validation with automatic SchemaStore lookup
A new language to learn on top of existing formats Most useful for larger configuration sets	Automatic fixes cover only some problems Formatting checks apply to a subset of the supported formats
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: Apache-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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