alp-params

Validate params from query, router or post body in koa 2

## Install ```sh npm install --save alp-params ``` ## API [https://.github.io/alp-params/docs](http://.github.io/alp-params/docs) ### Validator ##### .isValid() ##### .hasErrors() ##### .getErrors() ##### .string(name, position) ### ValueStringValidator ##### .notEmpty() ## Usage ```js import Koa from 'koa'; import params from 'alp-params'; const app = new Koa(); params(app); ``` ```js index(ctx) { const name = ctx.params.string('name').notEmpty().value; ctx.body = this.t('Hello %s!', ctx.params.isValid() ? name : 'World'); }, something(ctx) { // throw a 404 if the param was not found const name = ctx.validParams.string('name').notEmpty().value; ctx.body = this.t('Hello %s!', name); }, ```