---
layout: api
version: 3x
title: Express 3.x - API 參照
description: Access the API reference for Express.js version 3.x, noting that this version is end-of-life and no longer maintained - includes details on modules and methods.
menu: api
redirect_from: "  "
---

<div id="api-doc" markdown="1">

  <div class="doc-box doc-warn" markdown="1">
  **Express 3.x 已不再維護**

Known and unknown security and performance issues in 3.x have not been addressed since the last update (1 August, 2015). It is highly recommended to use the latest version of Express.

If you are unable to upgrade past 3.x, please consider [Commercial Support Options](/{{ page.lang }}/support#commercial-support-options).

  </div>

  <h1>3.x API</h1>

<a id='application' class='h2'></a>
{% include api/en/3x/app.md %}

</div>
