Validation with good Flow and TypeScript type inference
MIT License
λ "Functions all the way down" data validation for JavaScript and TypeScript.
Validate your configurations with precise error messages
Human-readable, fast and boilerplate-free contract programming (precondition checks) for JavaScript.
Flexible data validation using a ducktype interface. For JavaScript and Node.js.
Declarative static and runtime type checking with Flow
Validate nested object properties in javascript
JSR-303 Bean Validation for javascript
A minimalist runtime type checking utility for duck typing
Runtime type assertion and serialization system
Intuitive structural type notation for JavaScript.
A typesafe validation & parsing library for TypeScript.
Another biased type checking solution for Javascript