openapi: 3.2.0
info:
  title: University of Groningen Ocasys Course Catalog Academic…
  version: 2026-2027
  summary: Keyless read API behind Ocasys, the University of Groningen course and programme catalog.
  description: Ocasys (ocasys.rug.nl) is the University of Groningen's own course and degree-programme catalog.
  contact:
    name: University of Groningen — Center for Information Technology
    url: https://www.rug.nl/society-business/center-for-information-technology/
  termsOfService: https://www.rug.nl/info/disclaimer-copyright
  license:
    name: No licence published for the interface or its data
    identifier: NOASSERTION
servers:
- url: https://ocasys.rug.nl/api
  description: Production Ocasys backend (institution-operated, verified live 2026-08-30)
tags:
- name: Academic Years
  description: Which academic years the catalog holds and when the next one starts.
paths:
  /year-status:
    get:
      tags:
      - Academic Years
      operationId: listAcademicYears
      summary: List every academic year the catalog holds
      description: Returns each academic year with its identifier and whether it is active. Observed 200 with 40+ years, earliest 2010-2011.
      responses:
        '200':
          description: Academic years
          content:
            application/json:
              schema:
                type: object
                properties:
                  years:
                    type: array
                    items:
                      $ref: '#/components/schemas/AcademicYear'
  /year/next-academic-year-start-date:
    get:
      tags:
      - Academic Years
      operationId: getNextAcademicYearStartDate
      summary: Start date of the next academic year
      description: Returns a bare [year, month, day] array — a Java LocalDate serialized as an array, not an ISO-8601 string.
      responses:
        '200':
          description: Date as a three-element array
          content:
            application/json:
              schema:
                type: array
                items:
                  type: integer
                minItems: 3
                maxItems: 3
                examples:
                - - 2026
                  - 8
                  - 31
components:
  schemas:
    AcademicYear:
      type: object
      properties:
        id:
          type: string
          format: uuid
        year:
          type: string
          examples:
          - 2026-2027
        active:
          type: boolean
x-method: probed
x-generated: '2026-08-30'
x-source:
- https://ocasys.rug.nl/api/year-status
- https://ocasys.rug.nl/api/orgunit/faculties-and-universities
- https://ocasys.rug.nl/api/2026-2027/course?searchTerm=biology
- https://ocasys.rug.nl/api/2026-2027/course/WMMB015-05
- https://ocasys.rug.nl/api/2026-2027/course/page/WMMB015-05
- https://ocasys.rug.nl/api/2026-2027/program?searchTerm=biology
- https://ocasys.rug.nl/api/2026-2027/option-list
- https://ocasys.rug.nl/api/year/next-academic-year-start-date
x-operator: institution