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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 log in, 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 Dex.

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. Our small but expert team 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 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
Contributor Kyma Project Kyma Project
Sponsor ThoughtWorks ThoughtWorks
Sponsor Tulip Tulip Retail
Sponsor Cashdeck / All My Funds All My Funds
Sponsor 3 Rein 3REIN (avaiable soon)
Contributor Hootsuite Hootsuite
Adopter * Segment Segment
Adopter * Arduino Arduino

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.


ORY Security Console

ORY Security Console: Administrative User Interface

The ORY Security Console is a visual admin interface for managing ORY Hydra, ORY Oathkeeper, and ORY Keto.

ORY Oathkeeper: Identity & Access Proxy

ORY Oathkeeper is a BeyondCorp/Zero Trust Identity & Access Proxy (IAP) built on top of OAuth2 and ORY Hydra.

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.


The ory/examples repository contains numerous examples of setting up this project individually and together with other services from the ORY Ecosystem.


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 instead.


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


Our services collect summarized, anonymized data which 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 and

Command line documentation

Run hydra -h or hydra help.


Developing with ORY Hydra is as easy as:

go get -d -u
cd $GOPATH/src/
make init
export GO111MODULE=on
## With database
make test
## Without database
make quicktest

Then run it with in-memory database:

DSN=memory go run main.go serve all


  • We changed organization name from ory-am to ory. In order to keep backwards compatibility, we did not rename Go packages.
  • You can ignore warnings similar to package case-insensitive import collision: "" and "".

Libraries and third-party projects



⚠️ 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.

Blog posts & articles

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