Joi

Joi is the most powerful schema description language and data validator for JavaScript. Version 18.2.1 is the current stable release, with regular updates and a comprehensive API for defining schemas using a fluent, chainable syntax. It provides detailed error messages, custom validation, and extensive type support. Joi is widely used for validating API inputs, configuration objects, and form data, and offers a rich plugin ecosystem. It stands out with its expressive API and strong community support.