NUS Federated Identity Service (VAFS)
The National University of Singapore's own identity provider, and the only substantial machine-readable API surface the institution operates itself. Publishes an OpenID Connect discovery document, a JSON Web Key Set, and signed SAML 2.0 / WS-Federation metadata, all anonymously readable. Fronts OAuth 2.0 authorization, token, userinfo, device-code and logout endpoints. Relying parties are registered by NUS Information Technology; there is no public client registration and no self-service path.
NUS Federated Identity Service (VAFS) is one of 8 APIs that National University of Singapore publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
This API exposes 1 JSON Schema definition.
Tagged areas include Identity Federation, Authentication, OpenID Connect, SAML, and Single Sign-On. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, authentication docs, and 1 JSON Schema.
This API exposes 8 operations across 8 paths, organized into 3 resource areas, and defines 6 schemas. It is described by OpenAPI 3.0.3, at version 2026-08-19.
Requests are made against a single base URL, https://vafs.nus.edu.sg.
Metadata
The identity and technical contract details declared by the specification.
Authentication & Security 4
NUS Federated Identity Service (VAFS) declares
4 security schemes
for authenticating requests.
It accepts HTTP bearer tokens (JWT) (bearerAuth).
It accepts HTTP basic authentication (clientSecretBasic).
An API key is passed in the header as Authorization (clientSecretPost).
It supports OpenID Connect (oidc) discovered at https://vafs.nus.edu.sg/adfs/.well-known/openid-configuration.
clientSecretBasic— clientsecretbasic client authentication.clientSecretPost— Placeholder for clientsecretpost; the provider also advertises privatekeyjwt and windowsclientauthentication.
Paths & Operations 8
Across 8 paths, the API surfaces 8 operations — 6 GET, 2 POST. They span 3 resource areas: Discovery, Authorization, Session. Each is listed below with its method, path, parameters, and response codes.
Machine-readable metadata describing the identity service and its signing keys.
OAuth 2.0 / OpenID Connect authorization and token issuance.
End-user claims and session termination.
Schemas 6
The contract defines 6 schemas that model the data the API accepts and returns. The most detailed are OpenIdConfiguration (17 properties), UserInfo (16 properties), TokenResponse (7 properties), DeviceCodeResponse (5 properties). Each schema is shown below with its type and property counts.
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
More from National University of Singapore 7
Other APIs National University of Singapore publishes across the network.
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