---
lang: en
title: 'Using decorators'
keywords: LoopBack 4.0, LoopBack 4
tags:
sidebar: lb4_sidebar
permalink: /doc/en/lb4/Using-decorators.html
summary:
---

{% include content/tbd.html %}

> This will describe how to use existing decorators to build apps per
> [#552](https://github.com/strongloop/loopback-next/issues/552)

Potential topics:

- What is a decorator? Allows you annotate your classes with metadata.
  - simple example `@authenticate`
- How to use decorators (what are the features)
  - Define routes (@api)
  - Define access controls
  - Compose and customize decorators
- Note: you have to use Babel or TypeScript for decorator support