# Introducation
This library fully uses the advantages of decorators, make it smooth to write validation rules.
For detailed introductions and examples, please visit [validation.t2ee.org](http://validation.t2ee.org).
# Installation
`npm i reflect-metadata @t2ee/core @t2ee/validation -S`
# Example usage with [@t2ee/vader](https://github.com/t2ee/vader)
```typescript
class Message {
@NotNull
@Min(4)
message: string;
}
@Path('/')
@Component
class Controller {
@POST
@Path('/say')
say(@Valid @Body message: Message) {
// message should be at least 4 characters long
}
}
```