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ory / hydra

OAuth2 Server and OpenID Certified™ OpenID Connect Provider written in Go - cloud native, security-f...

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ORY Hydra - Open Source OAuth 2 and OpenID Connect server

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ORY Hydra is a hardened, OpenID Certified OAuth 2.0 Server and OpenID Connect Provider optimized for low-latency, high throughput, and low resource consumption. ORY Hydra is not an identity provider (user sign up, user login, password reset flow), but connects to your existing identity provider through a login and consent app. Implementing the login and consent app in a different language is easy, and exemplary consent apps (Go, Node) and SDKs are provided.

If you're looking to jump straight into it, go ahead:

Besides mitigating various attack vectors, such as database compromisation and OAuth 2.0 weaknesses, ORY Hydra is also able to securely manage JSON Web Keys. Click here to read more about security.

Table of Contents

What is ORY Hydra?

ORY Hydra is a server implementation of the OAuth 2.0 authorization framework and the OpenID Connect Core 1.0. Existing OAuth2 implementations usually ship as libraries or SDKs such as node-oauth2-server or fosite, or as fully featured identity solutions with user management and user interfaces, such as Keycloak.

Implementing and using OAuth2 without understanding the whole specification is challenging and prone to errors, even when SDKs are being used. The primary goal of ORY Hydra is to make OAuth 2.0 and OpenID Connect 1.0 better accessible.

ORY Hydra implements the flows described in OAuth2 and OpenID Connect 1.0 without forcing you to use a "Hydra User Management" or some template engine or a predefined front-end. Instead it relies on HTTP redirection and cryptographic methods to verify user consent allowing you to use ORY Hydra with any authentication endpoint, be it authboss, User Frosting or your proprietary Java authentication.

Who's using it?

The ORY community stands on the shoulders of individuals, companies, and maintainers. We thank everyone involved - from submitting bug reports and feature requests, to contributing patches, to sponsoring our work. Our community is 1000+ strong and growing rapidly. The ORY stack protects API requests every month with over 15.000+ active service nodes. We would have never been able to achieve this without each and everyone of you!

The following list represents companies that have accompanied us along the way and that have made outstanding contributions to our ecosystem. If you think that your company deserves a spot here, reach out to [email protected] now!

Please consider giving back by becoming a sponsor of our open source work on Patreon or Open Collective.

Type Name Logo Website
Sponsor Raspberry PI Foundation Raspberry PI Foundation raspberrypi.org
Contributor Kyma Project Kyma Project kyma-project.io
Sponsor ThoughtWorks ThoughtWorks thoughtworks.com
Sponsor Tulip Tulip Retail tulip.com
Sponsor Cashdeck / All My Funds All My Funds cashdeck.com.au
Sponsor 3Rein 3Rein 3rein.com
Contributor Hootsuite Hootsuite hootsuite.com
Adopter * Segment Segment segment.com
Adopter * Arduino Arduino arduino.cc
Sponsor OrderMyGear OrderMyGear ordermygear.com
Sponsor Spiri.bo Spiri.bo spiri.bo

We also want to thank all individual contributors

as well as all of our backers

and past & current supporters (in alphabetical order) on Patreon: Alexander Alimovs, Billy, Chancy Kennedy, Drozzy, Edwin Trejos, Howard Edidin, Ken Adler Oz Haven, Stefan Hans, TheCrealm.

* Uses one of ORY's major projects in production.

OAuth2 and OpenID Connect: Open Standards!

ORY Hydra implements Open Standards set by the IETF:

and the OpenID Foundation:

OpenID Connect Certified

ORY Hydra is an OpenID Foundation certified OpenID Provider (OP).

ORY Hydra is a certified OpenID Providier

The following OpenID profiles are certified:

To obtain certification, we deployed the reference user login and consent app (unmodified) and ORY Hydra v1.0.0.


This section is a quickstart guide to working with ORY Hydra. In-depth docs are available as well:

  • The documentation is available here.
  • The REST API documentation is available here.

5 minutes tutorial: Run your very own OAuth2 environment

The tutorial teaches you to set up ORY Hydra, a Postgres instance and an exemplary identity provider written in React using docker-compose. It will take you about 5 minutes to complete the tutorial.

OAuth2 Flow


Head over to the ORY Developer Documentation to learn how to install ORY Hydra on Linux, macOS, Windows, and Docker and how to build ORY Hydra from source.


We build Ory on several guiding principles when it comes to our architecture design:

  • Minimal dependencies
  • Runs everywhere
  • Scales without effort
  • Minimize room for human and network errors

ORY's architecture designed to run best on a Container Orchestration Systems such as Kubernetes, CloudFoundry, OpenShift, and similar projects. Binaries are small (5-15MB) and available for all popular processor types (ARM, AMD64, i386) and operating systems (FreeBSD, Linux, macOS, Windows) without system dependencies (Java, Node, Ruby, libxml, ...).

ORY Kratos: Identity and User Infrastructure and Management

ORY Kratos is an API-first Identity and User Management system that is built according to cloud architecture best practices. It implements core use cases that almost every software application needs to deal with: Self-service Login and Registration, Multi-Factor Authentication (MFA/2FA), Account Recovery and Verification, Profile and Account Management.

ORY Hydra: OAuth2 & OpenID Connect Server

ORY Hydra is an OpenID Certified™ OAuth2 and OpenID Connect Provider can connect to any existing identity database (LDAP, AD, KeyCloak, PHP+MySQL, ...) and user interface.

ORY Oathkeeper: Identity & Access Proxy

ORY Oathkeeper is a BeyondCorp/Zero Trust Identity & Access Proxy (IAP) with configurable authentication, authorization, and request mutation rules for your web services: Authenticate JWT, Access Tokens, API Keys, mTLS; Check if the contained subject is allowed to perform the request; Encode resulting content into custom headers (

), JSON Web Tokens and more!

ORY Keto: Access Control Policies as a Server

ORY Keto is a policy decision point. It uses a set of access control policies, similar to AWS IAM Policies, in order to determine whether a subject (user, application, service, car, ...) is authorized to perform a certain action on a resource.


Why should I use ORY Hydra? It's not that hard to implement two OAuth2 endpoints and there are numerous SDKs out there!

OAuth2 and OAuth2 related specifications are over 400 written pages. Implementing OAuth2 is easy, getting it right is hard. ORY Hydra is trusted by companies all around the world, has a vibrant community and faces millions of requests in production each day. Of course, we also compiled a security guide with more details on cryptography and security concepts. Read the security guide now.

Disclosing vulnerabilities

If you think you found a security vulnerability, please refrain from posting it publicly on the forums, the chat, or GitHub and send us an email to [email protected] instead.


Our continuous integration runs a collection of benchmarks against ORY Hydra. You can find the results here.


Our services collect summarized, anonymized data that can optionally be turned off. Click here to learn more.



The Guide is available here.

HTTP API documentation

The HTTP API is documented here.

Upgrading and Changelog

New releases might introduce breaking changes. To help you identify and incorporate those changes, we document these changes in UPGRADE.md and CHANGELOG.md.

Command line documentation


hydra -h
hydra help


We encourage all contributions and encourage you to read our contribution guidelines.


You need Go 1.13+ with

and (for the test suites):
  • Docker and Docker Compose
  • Makefile
  • NodeJS / npm

It is possible to develop ORY Hydra on Windows, but please be aware that all guides assume a Unix shell like bash or zsh.


Install Tools

When cloning ORY Hydra, run

make deps
. It will download several required dependencies. If you haven't run the command in a while it's probably a good idea to run it again.

Formatting Code

You can format all code using

make format
. Our CI checks if your code is properly formatted.

Running Tests

There are three types of tests you can run:

  • Short tests (do not require a SQL database like PostgreSQL)
  • Regular tests (do require PostgreSQL, MySQL, CockroachDB)
  • End to end tests (do require databases and will use a test browser)
Short Tests

Short tests run fairly quickly. You can either test all of the code at once:

shell script
go test -short ./...

or test just a specific module:

shell script
cd client; go test -short .
Regular Tests

Regular tests require a database set up. Our test suite is able to work with docker directly (using ory/dockertest) but we encourage to use the Makefile instead. Using dockertest can bloat the number of Docker Images on your system and are quite slow. Instead we recommend doing:

shell script
make test

Please be aware that

make test
recreates the databases every time you run
make test
. This can be annoying if you are trying to fix something very specific and need the database tests all the time. In that case we suggest that you initialize the databases with:

shell script
make resetdb
export TEST_DATABASE_MYSQL='mysql://root:[email protected]('
export TEST_DATABASE_POSTGRESQL='postgres://postgres:[email protected]:3445/postgres?sslmode=disable'
export TEST_DATABASE_COCKROACHDB='cockroach://[email protected]:3446/defaultdb?sslmode=disable'

Then you can run

go test
as often as you'd like:

```shell script go test -p 1 ./...

or in a module:

cd client; go test . ```

E2E Tests

The E2E tests use Cypress to run full browser tests. You can execute these tests with:

make e2e

The runner will not show the Browser window, as it runs in the CI Mode (background). That makes debugging these type of tests very difficult, but thankfully you can run the e2e test in the browser which helps with debugging! Just run:

```shell script ./test/e2e/circle-ci.bash memory --watch

Or for the JSON Web Token Access Token strategy:

./test/e2e/circle-ci.bash memory-jwt --watch

or if you would like to test one of the databases:

```shell script make resetdb export TEST_DATABASE_MYSQL='mysql://root:[email protected](' export TEST_DATABASE_POSTGRESQL='postgres://postgres:[email protected]:3445/postgres?sslmode=disable' export TEST_DATABASE_COCKROACHDB='cockroach://[email protected]:3446/defaultdb?sslmode=disable'

You can test against each individual database:

./test/e2e/circle-ci.bash postgres --watch ./test/e2e/circle-ci.bash memory --watch ./test/e2e/circle-ci.bash mysql --watch


Once you run the script, a Cypress window will appear. Hit the button "Run all Specs"!

The code for these tests is located in ./cypress/integration and ./cypress/support and ./cypress/helpers. The website you're seeing is located in ./test/e2e/oauth2-client.

Build Docker

You can build a development Docker Image using:

shell script
make docker

Run the Docker Compose quickstarts

If you wish to check your code changes against any of the docker-compose quickstart files, run:

shell script
make docker
docker compose -f quickstart.yml up # ....

Libraries and third-party projects

Official: * User Login & Consent Example

Community: * Kubernetes helm chart * Werther - an Identity Provider over LDAP * Terraform Provider and its source code.

:warning: Outdated Community Projects: The following projects are outdated and won't work anymore in most cases. Having said that they still might help you to better understand how to integrate HYDRA and solve specific cases. * ORY Hydra middleware for Gin * Consent App SDK for Go

Blog posts & articles

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