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description: Access the API reference for Express.js version 3.x, noting that this version is end-of-life and no longer maintained - includes details on modules and methods.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

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

  <div class="doc-box doc-warn" markdown="1">
  **Express 3.x support is ending soon**

This series will continue to receive only security updates and bug fixes until July 2015. It is highly recommended to upgrade to Express 4.x.

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>
