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University of Groningen

University of Groningen Ocasys Course Catalog API

The JSON backend behind Ocasys, the University's own course and degree-programme catalog. Verified live 2026-08-30 with no credentials: course search, full course records, the catalog page projection, programme search, faculties and organizational units, controlled option lists and the academic-year list all return 200 to an anonymous GET. Course records are bilingual and carry ECTS credits, study level, assessments, formats, prerequisites, offerings, ENLIGHT alliance status and per-course UN Sustainable Development Goal flags. Enrollment, permission and course-offering paths in the same namespace return 403 without an institutional SAML session and are documented as gated, not as callable. This is the one genuinely institution-engineered API surface in the University's footprint. The OpenAPI below is DERIVED by API Evangelist from live probes — the University publishes none, and does not advertise this interface at all.

Documentation Provider Profile APIs.io OpenAPI GitHub

University of Groningen Ocasys Course Catalog API is one of 6 APIs that University of Groningen publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Course Catalog, Education, Curriculum, Registrar, and Open Data. The published artifact set on APIs.io includes an OpenAPI specification and authentication docs.

This API exposes 9 operations across 9 paths, organized into 5 resource areas, and defines 8 schemas. It is described by OpenAPI 3.1.0, at version 2026-2027.

Requests are made against a single base URL, https://ocasys.rug.nl/api.

9 operations 9 paths 8 schemas 9 GET

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.1.0
API Version
2026-2027
Base URL
https://ocasys.rug.nl/api
Contact
University of Groningen — Center for Information Technology
License
No licence published for the interface or its data
Terms of Service
View terms
Resource Areas
5

Paths & Operations 9

Across 9 paths, the API surfaces 9 operations — 9 GET. They span 5 resource areas: Academic Years, Organization, Courses, Programmes, Option Lists. Each is listed below with its method, path, parameters, and response codes.

Academic Years 2

Which academic years the catalog holds and when the next one starts.

GET
/year-status
List every academic year the catalog holds
listAcademicYears → 200
GET
/year/next-academic-year-start-date
Start date of the next academic year
getNextAcademicYearStartDate → 200
Organization 1

Faculties and departments used to scope courses and programmes.

GET
/orgunit/faculties-and-universities
List faculties and the university root organizational unit
listFacultiesAndUniversities → 200
Courses 4

Course search and full course descriptions.

GET
/{academicYear}/course
Search courses within one academic year
searchCourses 2 params → 200400
GET
/{academicYear}/course/{courseCode}
Get one course by its catalog code
getCourse 2 params → 200404
GET
/{academicYear}/course/page/{courseCode}
Get the catalog page projection of one course
getCoursePage 2 params → 200404
GET
/{academicYear}/course-offering
List course offerings (institutional session required)
listCourseOfferings 2 params → 403
Programmes 1

Degree-programme search.

GET
/{academicYear}/program
Search degree programmes within one academic year
searchPrograms 2 params → 200400
Option Lists 1

Controlled vocabularies used by course and programme records.

GET
/{academicYear}/option-list
List the controlled option lists used by course and programme records
listOptions 1 param → 200

Schemas 8

The contract defines 8 schemas that model the data the API accepts and returns. The most detailed are Course (25 properties), Program (14 properties), Option (7 properties), CourseSummary (7 properties). Each schema is shown below with its type and property counts.

LocalizedText
object
Bilingual string, Dutch and English. The catalog is authored in both languages.
2 properties
AcademicYear
object
3 properties
OrganizationalUnit
object
6 properties
CourseSummary
object
7 properties
Course
object
Full course record as served for a single course code.
25 properties
Program
object
14 properties
Option
object
7 properties
Problem
object
RFC 9457 problem detail, as emitted by the Spring backend.
5 properties

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

university-of-groningen-course-catalog-api-openapi.yml Raw ↑

Other APIs University of Groningen publishes across the network.

University of Groningen Research Database OAI-PMH
AE Profile APIs.io
University of Groningen Identity Provider (SURFconext / eduGAIN)
AE Profile APIs.io
University of Groningen Research Portal (Pure) REST API
AE Profile APIs.io
University of Groningen research data collection on DataverseNL
AE Profile APIs.io
University of Groningen Library discovery (OCLC WorldCat)
AE Profile APIs.io
#Course Catalog#Education#Curriculum#Registrar#Open Data
← Back to U APIs
API Details
ID
university-of-groningen:ocasys-course-catalog
Base URL
https://ocasys.rug.nl/api
Docs
https://ocasys.rug.nl/
Provider
University of Groningen
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