A Ruby wrapper for the OAuth 2.0 protocol.
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⚠️ WARNING: You are viewing the README of the master branch which contains unreleased changes for version 2.0.0.


If you need the readme for a released version of the gem please find it below:

Version Release Date Readme
1.4.0 Jun 9, 2017 https://github.com/oauth-xx/oauth2/blob/v1.4.0/README.md
1.3.1 Mar 3, 2017 https://github.com/oauth-xx/oauth2/blob/v1.3.1/README.md
1.3.0 Dec 27, 2016 https://github.com/oauth-xx/oauth2/blob/v1.3.0/README.md
1.2.0 Jun 30, 2016 https://github.com/oauth-xx/oauth2/blob/v1.2.0/README.md
1.1.0 Jan 30, 2016 https://github.com/oauth-xx/oauth2/blob/v1.1.0/README.md
1.0.0 May 23, 2014 https://github.com/oauth-xx/oauth2/blob/v1.0.0/README.md
< 1.0.0 Find here https://github.com/oauth-xx/oauth2/tags

Gem Version Total Downloads Total Downloads Build Status Coverage Status Maintainability Depfu License: MIT Documentation

Oauth2 gem is looking for additional maintainers. See #307.

A Ruby wrapper for the OAuth 2.0 specification.


Add this line to your application's Gemfile:

gem 'oauth2'

And then execute:

$ bundle

Or install it yourself as:

$ gem install oauth2


Usage Examples

require 'oauth2'
client = OAuth2::Client.new('client_id', 'client_secret', :site => 'https://example.org')

client.auth_code.authorize_url(:redirect_uri => 'http://localhost:8080/oauth2/callback')
# => "https://example.org/oauth/authorization?response_type=code&client_id=client_id&redirect_uri=http://localhost:8080/oauth2/callback"

token = client.auth_code.get_token('authorization_code_value', :redirect_uri => 'http://localhost:8080/oauth2/callback', :headers => {'Authorization' => 'Basic some_password'})
response = token.get('/api/resource', :params => { 'query_foo' => 'bar' })
# => OAuth2::Response


Set an environment variable, however you would normally do that.

# will log both request and response, including bodies
ENV['OAUTH_DEBUG'] = 'true'


The AccessToken methods #get, #post, #put and #delete and the generic #request will return an instance of the #OAuth2::Response class.

This instance contains a #parsed method that will parse the response body and return a Hash if the Content-Type is application/x-www-form-urlencoded or if the body is a JSON object. It will return an Array if the body is a JSON array. Otherwise, it will return the original body string.

The original response body, headers, and status can be accessed via their respective methods.


If you have an existing Access Token for a user, you can initialize an instance using various class methods including the standard new, from_hash (if you have a hash of the values), or from_kvform (if you have an application/x-www-form-urlencoded encoded string of the values).


On 400+ status code responses, an OAuth2::Error will be raised. If it is a standard OAuth2 error response, the body will be parsed and #code and #description will contain the values provided from the error and error_description parameters. The #response property of OAuth2::Error will always contain the OAuth2::Response instance.

If you do not want an error to be raised, you may use :raise_errors => false option on initialization of the client. In this case the OAuth2::Response instance will be returned as usual and on 400+ status code responses, the Response instance will contain the OAuth2::Error instance.

Authorization Grants

Currently the Authorization Code, Implicit, Resource Owner Password Credentials, Client Credentials, and Assertion authentication grant types have helper strategy classes that simplify client use. They are available via the #auth_code, #implicit, #password, #client_credentials, and #assertion methods respectively.

auth_url = client.auth_code.authorize_url(:redirect_uri => 'http://localhost:8080/oauth/callback')
token = client.auth_code.get_token('code_value', :redirect_uri => 'http://localhost:8080/oauth/callback')

auth_url = client.implicit.authorize_url(:redirect_uri => 'http://localhost:8080/oauth/callback')
# get the token params in the callback and
token = OAuth2::AccessToken.from_kvform(client, query_string)

token = client.password.get_token('username', 'password')

token = client.client_credentials.get_token

token = client.assertion.get_token(assertion_params)

If you want to specify additional headers to be sent out with the request, add a 'headers' hash under 'params':

token = client.auth_code.get_token('code_value', :redirect_uri => 'http://localhost:8080/oauth/callback', :headers => {'Some' => 'Header'})

You can always use the #request method on the OAuth2::Client instance to make requests for tokens for any Authentication grant type.

Supported Ruby Versions

This library aims to support and is tested against the following Ruby implementations:

Rubies with support ending at Oauth2 2.x

Rubies with continued support past Oauth2 2.x

  • Ruby 2.3 - Support through version 3.x series
  • Ruby 2.4
  • Ruby 2.5
  • JRuby 9.1

If something doesn't work on one of these interpreters, it's a bug.

This library may inadvertently work (or seem to work) on other Ruby implementations, however support will only be provided for the versions listed above.

If you would like this library to support another Ruby version, you may volunteer to be a maintainer. Being a maintainer entails making sure all tests run and pass on that implementation. When something breaks on your implementation, you will be responsible for providing patches in a timely fashion. If critical issues for a particular implementation exist at the time of a major release, support for that Ruby version may be dropped.


This library aims to adhere to Semantic Versioning 2.0.0. Violations of this scheme should be reported as bugs. Specifically, if a minor or patch version is released that breaks backward compatibility, a new version should be immediately released that restores compatibility. Breaking changes to the public API will only be introduced with new major versions.

As a result of this policy, you can (and should) specify a dependency on this gem using the Pessimistic Version Constraint with two digits of precision.

For example:

spec.add_dependency 'oauth2', '~> 1.4'




After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.


Bug reports and pull requests are welcome on GitHub at https://github.com/oauth-xx/oauth2. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

Code of Conduct

Everyone interacting in the OAuth2 project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.