oauth2-server/index.md

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title: Introduction
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<p>This is the documentation for the second version 5 release candidate.</p>

<p>Version 5 is stable and is the recommended version that you should implement as it is significantly simpler to work with.</p>

<p>Version 4 docs can be <a href="/V4-docs/">found here</a>.</p>

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# Introduction

[![Author](http://img.shields.io/badge/author-@alexbilbie-red.svg?style=flat-square)](https://twitter.com/alexbilbie)
[![Source Code](http://img.shields.io/badge/source-thephpleague%2Foauth2--server-blue.svg?style=flat-square)](https://github.com/thephpleague/oauth2-server)
[![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE.md)
[![Build Status](https://img.shields.io/travis/thephpleague/oauth2-server/master.svg?style=flat-square)](https://travis-ci.org/thephpleague/oauth2-server)
[![Total Downloads](https://img.shields.io/packagist/dt/league/oauth2-server.svg?style=flat-square)](https://packagist.org/packages/league/oauth2-server)

`league/oauth2-server` is a library that makes implementing a standards compliant OAuth 2.0 server trivial. Your users can authenticate and authorize application clients, and protect your APIs.

Out of the box it supports all of the grants defined in the [OAuth 2.0 Authorization Framework RFC](https://tools.ietf.org/html/rfc6749):

* Authorization code grant
* Implicit grant
* Client credentials grant
* Resource owner password credentials grant
* Refresh grant

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You can also easily make your own [custom grants]().
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This library was created by Alex Bilbie. Find him on Twitter at [@alexbilbie](https://twitter.com/alexbilbie).

## Changelog

The full changelog can be viewed here - [https://github.com/thephpleague/oauth2-server/releases](https://github.com/thephpleague/oauth2-server/releases).

The latest release is [![GitHub tag](https://img.shields.io/github/tag/thephpleague/oauth2-server.svg)](https://github.com/thephpleague/oauth2-server/releases)

## Support

Please ask questions on the [Github issues page](https://github.com/thephpleague/oauth2-server/issues).

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For commercial support and custom implementations please visit [Glynde Labs](https://glyndelabs.com).
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