University of Tokyo Records API

openapi: 3.2.0
info:
  title: UTokyo Repository Records API
  version: '2026-08-19'
  summary: Read-only JSON records API of the University of Tokyo institutional repository.
  description: "The UTokyo Repository (東京大学学術機関リポジトリ) is the University of Tokyo's institutional\nrepository, self-hosted by the University of Tokyo Library System on the university's own\ninfrastructure at `repository.dl.itc.u-tokyo.ac.jp`. It runs WEKO3, the open-source\nrepository platform published by Japan's National Institute of Informatics (NII) on top of\nInvenio — software the university installs and operates itself, not a hosted vendor tenancy.\nThe host, the DOI prefix (10.15083, registered through the Japan Link Center), the OAI-PMH\nadmin contact (digilib@lib.u-tokyo.ac.jp) and the operations are all the university's.\n\nThis document describes the read-only JSON records interface that the deployment exposes at\n`/api/records/`. It is NOT a specification the University of Tokyo publishes. It was derived\nby API Evangelist from live, unauthenticated probes of the running service on 2026-08-19 and\nis a description of observed behaviour only.\n\nHonest caveats, stated because they matter to anyone who would call this:\n\n* The university does not document this endpoint anywhere public that could be found. The\n  only harvesting interface the University of Tokyo Library System documents is OAI-PMH.\n* `robots.txt` on this host carries `Disallow: /api/`. It also carries `Disallow: /oai`,\n  which the library documents publicly as the sanctioned harvesting path, so the file reads\n  as a stock WEKO3 default rather than a considered access policy — but it is there, and a\n  well-behaved crawler should honour it.\n* There is no published rate limit, no versioning policy, no deprecation policy and no\n  support channel for this interface. Treat it as an internal surface that happens to be\n  reachable, not as a product.\n"
  contact:
    name: University of Tokyo Library System — Digital Library Section
    email: digilib@lib.u-tokyo.ac.jp
    url: https://www.lib.u-tokyo.ac.jp/en/
  license:
    name: Rights vary per record; see the accessRights and rights fields of each record
    url: https://repository.dl.itc.u-tokyo.ac.jp/
servers:
- url: https://repository.dl.itc.u-tokyo.ac.jp/api
  description: Production. Institution-operated. No authentication required for read access.
tags:
- name: records
  description: Deposited items — theses, journal articles, departmental bulletins, research data.
paths:
  /records/:
    get:
      operationId: listRecords
      summary: Search and page through repository records
      description: Returns a paged envelope of records. Observed corpus size on 2026-08-19 was 69,549 records. Unauthenticated; only publicly published items are returned.
      tags:
      - records
      parameters:
      - name: q
        in: query
        required: false
        description: Full-text query over record metadata. Observed behaviour — no query returned 69,549 hits, `q=東京` returned 63,402, and `q=nonexistentzzzz123` returned 0.
        schema:
          type: string
        example: 東京
      - name: size
        in: query
        required: false
        description: Records per page. Defaults to 10 when omitted.
        schema:
          type: integer
          default: 10
          minimum: 1
        example: 2
      - name: page
        in: query
        required: false
        description: 1-indexed page number. Follow `links.next` rather than computing this.
        schema:
          type: integer
          default: 1
          minimum: 1
        example: 2
      - name: sort
        in: query
        required: false
        description: Accepted without error (`sort=mostrecent` returned HTTP 200), but no ordering change was observable in the probes run. Documented as observed, not as guaranteed.
        schema:
          type: string
      responses:
        '200':
          description: A page of records.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/RecordList'
              examples:
                twoRecords:
                  summary: Live response captured 2026-08-19 (?size=2)
                  externalValue: ../examples/university-of-tokyo-repository-records-list.json
        '500':
          description: Returned for unsupported query parameters. `?size=2&format=json` produced HTTP 500 with a 182-byte body rather than a 400, so parameter validation is not defensive.
          content:
            text/html:
              schema:
                type: string
  /records/{recordId}:
    get:
      operationId: getRecord
      summary: Retrieve one record by its control number
      tags:
      - records
      parameters:
      - name: recordId
        in: path
        required: true
        description: WEKO control number, also carried as `metadata.control_number`.
        schema:
          type: string
        example: '2003301'
      responses:
        '200':
          description: The record.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Record'
              examples:
                thesis:
                  summary: Live response captured 2026-08-19
                  externalValue: ../examples/university-of-tokyo-repository-record.json
components:
  schemas:
    RecordMetadata:
      type: object
      description: JPCOAR-shaped item metadata. `_item_metadata` carries the raw WEKO item-type attribute map with Japanese `attribute_name` labels and opaque `item_<id>` keys; the sibling top-level fields are the flattened, stable view and are what a consumer should read.
      properties:
        title:
          type: array
          items:
            type: string
        creator:
          type: array
          items:
            type: string
        description:
          type: array
          items:
            type: string
        date:
          type: array
          items:
            type: string
        language:
          type: array
          items:
            type: string
        type:
          type: array
          items:
            type: string
        itemtype:
          type: string
          description: Item type label, bilingual.
          example: 学位論文 / Thesis or Dissertation
        accessRights:
          type: array
          items:
            type: string
          example:
          - open access
        control_number:
          type: string
        publish_date:
          type: string
        publish_status:
          type: string
        path:
          type: array
          description: OAI-PMH set memberships this item belongs to.
          items:
            type: string
        identifierRegistration:
          type: array
          description: Registered persistent identifier. Every sampled record used identifierType JaLC (Japan Link Center) under the university's DOI prefix 10.15083. No DataCite or Crossref registration was observed.
          items:
            type: object
            properties:
              identifierType:
                type: string
                example: JaLC
              value:
                type: string
                example: 10.15083/0002003301
        degreeName:
          type: array
          items:
            type: string
        degreeGrantor:
          type: array
          items:
            type: string
        dateGranted:
          type: array
          items:
            type: string
        dissertationNumber:
          type: array
          items:
            type: string
        _oai:
          type: object
          description: OAI-PMH identifier and set membership for this item.
        _files_info:
          type: array
          description: Attached files with label, extension, availability date and direct URL.
          items:
            type: object
            properties:
              label:
                type: string
              extention:
                type: string
              url:
                type: string
                format: uri
              date:
                type: array
                items:
                  type: object
        _creator_info:
          type: array
          items:
            type: object
        _item_metadata:
          type: object
          description: Raw WEKO item-type attribute map. Keys are deployment-specific.
    Record:
      type: object
      required:
      - id
      - created
      - updated
      - links
      - metadata
      properties:
        id:
          type: integer
          description: WEKO control number as an integer.
          example: 2003301
        created:
          type: string
          format: date-time
        updated:
          type: string
          format: date-time
        links:
          type: object
          properties:
            self:
              type: string
              format: uri
        metadata:
          $ref: '#/components/schemas/RecordMetadata'
    RecordList:
      type: object
      description: Paged envelope. Observed on every 200 from /records/.
      required:
      - hits
      - links
      properties:
        hits:
          type: object
          required:
          - hits
          - total
          properties:
            hits:
              type: array
              items:
                $ref: '#/components/schemas/Record'
            total:
              type: integer
              description: Total matching records.
              example: 69549
        aggregations:
          type: object
          description: Facet buckets. Observed empty on every probe.
        links:
          type: object
          properties:
            self:
              type: string
              format: uri
            next:
              type: string
              format: uri
            prev:
              type: string
              format: uri
x-operator: institution
x-operator-evidence: Host repository.dl.itc.u-tokyo.ac.jp is under the university's own registrable domain u-tokyo.ac.jp. OAI-PMH Identify on the same host returns repositoryName "UTokyo Repository" and adminEmail digilib@lib.u-tokyo.ac.jp. No vendor name appears in any server, title or contact. The platform (WEKO3) is open-source software from NII that the institution runs; it is not a vendor-hosted tenancy.
x-provenance:
  generated: '2026-08-19'
  method: derived
  source:
  - https://repository.dl.itc.u-tokyo.ac.jp/api/records/
  - https://repository.dl.itc.u-tokyo.ac.jp/api/records/?size=2
  - https://repository.dl.itc.u-tokyo.ac.jp/api/records/2003301
  - https://repository.dl.itc.u-tokyo.ac.jp/robots.txt
  note: Derived from live responses, not from a published specification. Every path, parameter and field below was observed in an actual HTTP 200 response on 2026-08-19.