# IMPORTANT !!
`@t2ee/vader` has now moved towards `1.x` versions, with brand new mechanisms (though, 99% like apis as `0.x` versions). For legacy `0.x` versions, please see [0.x branch](https://github.com/t2ee/vader/tree/0.x).
# Introducation
@t2ee/vader is a routing component (with JAX-RS like grammars). It is to be used with [koa@2](https://github.com/koajs/koa).
For detailed introduction and examples, please visit [vader.t2ee.org](//vader.t2ee.org)
# Installation
`npm i reflect-metadata @t2ee/core @t2ee/sl4js koa@2 @t2ee/vader -S`
# Example
```typescript
import 'reflect-metadata';
import * as Koa from 'koa';
import {
Path,
Router,
QueryParam,
Response,
GET,
} from '@t2ee/vader';
const router = Router.newInstance();
@Path('')
class Controller {
@GET
@Path('/say')
say(@QueryParam('message') message: string) {
const response = new Response();
response.body = message;
return response;
}
}
router.use(Controller);
const app = new Koa();
app.use(router.routes());
app.listen(8080);
```