# CityUHK Single Sign-On (OpenID Connect / OAuth 2.0)

**Canonical:** https://apis.io/apis/cityu/auth-oidc/  
**Provider:** City University of Hong Kong — https://apis.io/providers/cityu/  
**Base URL:** https://auth.cityu.edu.hk/oauth2/v1  
**Documentation:** https://auth.cityu.edu.hk/

CityUHK Single Sign-On (OpenID Connect / OAuth 2.0) is one of 5 APIs that [City University of Hong Kong](https://apis.io/providers/cityu/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Identity, OpenID Connect, Authentication, and Single Sign-On. The published artifact set on APIs.io includes authentication docs.

CityUHK's OpenID Connect and OAuth 2.0 authorization server on the university's own hostname auth.cityu.edu.hk, which CNAMEs to cityu.customdomains.okta.com. Serves an OpenID Connect Discovery 1.0 document and an RFC 8414 authorization-server metadata document, both publicly readable, with issuer https://auth.cityu.edu.hk. The configuration is CityUHK's; the platform is Okta.

## Machine-readable artifacts (3)

- **x-openid-configuration** — https://auth.cityu.edu.hk/.well-known/openid-configuration
- **x-oauth-authorization-server** — https://auth.cityu.edu.hk/.well-known/oauth-authorization-server
- **Authentication** — https://raw.githubusercontent.com/api-evangelist/cityu/refs/heads/main/authentication/cityu-authentication.yml

## Other City University of Hong Kong APIs (4)

- [CityUHK Scholars OAI-PMH](https://apis.io/apis/cityu/scholars-oai/)
- [CityUHK Scholars Pure Web Service (tenant deployment)](https://apis.io/apis/cityu/scholars-pure-ws/)
- [CityUHK Shibboleth Identity Provider](https://apis.io/apis/cityu/shibboleth-idp/)
- [CityUHK Canvas Learning Management System (tenant deployment)](https://apis.io/apis/cityu/canvas/)

## Tags

Identity, OpenID Connect, Authentication, Single Sign-On

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/cityu/auth-oidc/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/cityu/.