Valitron

Valitron is completely stand-alone with no external libraries, avoiding bloat from frameworks like Symfony's HttpFoundation and keeping the codebase minimal, as emphasized in the 'Why Valitron?' section.

Uses simple, chainable methods and dot-notation for nested arrays, making validation rules concise and easy to understand, shown in examples like validating 'settings.*.threshold'.

Includes over 40 built-in rules covering common needs such as email, date, creditCard, and conditional logic like requiredWith, reducing the need for custom code.

Allows adding custom validation logic via closures using the addRule method, enabling flexible, project-specific validations without extending the library.