# UseParam Decorator

Module
import { UseParam } from "@tsed/common"
Source/packages/common/src/mvc/decorators/params/useParam.ts

# Overview

function UseParam(paramType: ParamTypes | string, options?: IParamOptions<any>): ParameterDecorator;

# Description

Register a new param. It use the paramType to extract value and give it to the next pipe.

Given options allow to enable or disable following pipes:

  • useType: Add extra type for the json mapper,
  • expression: Get property from the returned value by the previous pipe.
  • useValidation: Apply validation from the returned value by the previous pipe.
  • useConverter: Apply json mapper from the returned value by the previous pipe.