openapi: 3.2.0
info:
  title: University of Groningen Ocasys Course Catalog Programmes API
  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: Programmes
  description: Degree-programme search.
paths:
  /{academicYear}/program:
    get:
      tags:
      - Programmes
      operationId: searchPrograms
      summary: Search degree programmes within one academic year
      parameters:
      - $ref: '#/components/parameters/AcademicYear'
      - name: searchTerm
        in: query
        required: true
        description: Free-text term matched against programme code and title. Required — omitting it returns 400.
        schema:
          type: string
      responses:
        '200':
          description: Matching programmes
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Program'
        '400':
          $ref: '#/components/responses/ProblemBadRequest'
components:
  schemas:
    Program:
      type: object
      properties:
        id:
          type: string
          format: uuid
        code:
          type: string
        title:
          $ref: '#/components/schemas/LocalizedText'
        levels:
          type: array
          items:
            type: string
            enum:
            - MASTER
            - BACHELOR
            - EXCHANGE
            - PRE_MASTER
            - UNIVERSITY_LEVEL_MINOR
            - FACULTY_LEVEL_MINOR
            - POST_GRADUATE
        languages:
          type: array
          items:
            type: string
            enum:
            - ENGLISH
            - DUTCH
        credits:
          type: number
        term:
          type: string
        duration:
          type: integer
          description: Nominal duration in years.
        facultyTitle:
          $ref: '#/components/schemas/LocalizedText'
        organizationalUnitTitle:
          $ref: '#/components/schemas/LocalizedText'
        official:
          type: boolean
        yearVisible:
          type: boolean
        otherPeriods:
          type: boolean
        draft:
          type: boolean
    Problem:
      type: object
      description: RFC 9457 problem detail, as emitted by the Spring backend.
      properties:
        type:
          type: string
          examples:
          - about:blank
        title:
          type: string
        status:
          type: integer
        detail:
          type: string
        instance:
          type: string
    LocalizedText:
      type: object
      description: Bilingual string, Dutch and English. The catalog is authored in both languages.
      properties:
        en:
          type: string
        nl:
          type: string
  parameters:
    AcademicYear:
      name: academicYear
      in: path
      required: true
      description: Academic year in YYYY-YYYY form, e.g. 2026-2027. A value that does not parse returns 400.
      schema:
        type: string
        pattern: ^[0-9]{4}-[0-9]{4}$
  responses:
    ProblemBadRequest:
      description: RFC 9457 problem detail
      content:
        application/problem+json:
          schema:
            $ref: '#/components/schemas/Problem'
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