code: func (ctx *ReqCtx) Params(v interface{}) error {
  	if ctx.params == nil {
  		return errors.New("ctx: request did not have any request parameters")
  	}
  
  	if err := json.Unmarshal(ctx.params, v); err != nil {
  		return fmt.Errorf("ctx: cannot deserialize request params: %v", err)
  	}
  
  	return nil
  }
docs: // Params reads request parameters into given object.
  // Object should be passed by reference.