b-validate

b-validate is a JavaScript and TypeScript validation library offering a flexible, chainable API for data validation. It supports basic type and value checks, as well as complex schema-based validation for objects, including asynchronous validation logic. Since its rewrite in TypeScript in version 1.4.0, it ships with robust type definitions. The library is currently stable at version 1.5.3, with releases occurring periodically to address bugs and introduce minor enhancements rather than a fixed cadence. Key differentiators include its fluent, chainable API for individual validations, comprehensive schema validation capabilities, support for custom synchronous and asynchronous validators, and granular control over validation messages, including global configuration and locale-specific message templates. It aims to provide a comprehensive validation solution for both simple and complex data structures in web and Node.js environments.