University of Tokyo

University of Tokyo Items API

Item representations in JSON-LD, CSV and refer/BibIX.

Documentation GitHub OpenAPI

Operations 1

GET /assets/{assetId} Retrieve one archival item #

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OpenAPI Specification

openapi: 3.2.0
info:
  title: UTokyo Academic Assets Archives Portal Items API
  version: '2026-08-19'
  summary: Search, item-representation and IIIF interfaces of the University of Tokyo Academic Assets Archives Portal (東京大学学術資産等アーカイブズポータル).
  description: 'The Academic Assets Archives Portal is operated by the University of Tokyo Library System on

    the university''s own hosts.'
  contact:
    name: University of Tokyo Library System — Archives Portal
    email: jitsumu_arch@lib.u-tokyo.ac.jp
    url: https://da.dl.itc.u-tokyo.ac.jp/portal/en/contact
  license:
    name: Reuse conditions of the General Library, The University of Tokyo
    url: https://www.lib.u-tokyo.ac.jp/ja/library/general/reuse
servers:
- url: https://da.dl.itc.u-tokyo.ac.jp/portal
  description: Archives Portal. Institution-operated.
- url: https://iiif.dl.itc.u-tokyo.ac.jp
  description: IIIF Image API server. Institution-operated.
tags:
- name: Items
  description: Item representations in JSON-LD, CSV and refer/BibIX.
paths:
  /assets/{assetId}:
    get:
      operationId: getAsset
      summary: Retrieve one archival item
      description: Returns the item detail page, or a machine-readable representation when `_format` is given. All three machine formats returned HTTP 200 on probe. The JSON form is JSON-LD (`application/ld+json`) with a DC-NDL / Dublin Core / FOAF context.
      tags:
      - Items
      parameters:
      - name: assetId
        in: path
        required: true
        description: Item UUID. Also the tail of the OAI-PMH identifier for this item.
        schema:
          type: string
          format: uuid
        example: fbd0479b-dbb4-4eaa-95b8-f27e1c423e4b
      - name: _format
        in: query
        required: false
        description: '`json` returns JSON-LD (3,131 bytes on probe), `csv` returns text/csv (5,482 bytes), `bix` returns refer/BibIX as text/plain (601 bytes). Omitted returns HTML.'
        schema:
          type: string
          enum:
          - json
          - csv
          - bix
      responses:
        '200':
          description: The item.
          content:
            application/ld+json:
              schema:
                type: object
                description: DC-NDL descriptive metadata as JSON-LD. Context binds dcndl, dcterms, foaf, rdfs and dc.
              examples:
                item:
                  summary: Captured live 2026-08-19
                  externalValue: ../examples/university-of-tokyo-archives-item-jsonld.json
            text/csv:
              schema:
                type: string
            text/plain:
              schema:
                type: string
                description: refer/BibIX format.
        '404':
          description: Unknown item.
externalDocs:
  description: APIについて — the portal's own API documentation (Japanese only)
  url: https://da.dl.itc.u-tokyo.ac.jp/portal/help/api
x-operator: institution
x-operator-evidence: da.dl.itc.u-tokyo.ac.jp and iiif.dl.itc.u-tokyo.ac.jp are both under u-tokyo.ac.jp. The IIIF manifests carry attribution "東京大学総合図書館 General Library, The University of Tokyo, JAPAN", a logo on iiif.dl.itc.u-tokyo.ac.jp and a license pointing at lib.u-tokyo.ac.jp. No vendor host, title or contact is present anywhere in the surface.
x-provenance:
  generated: '2026-08-19'
  method: probed
  source:
  - https://da.dl.itc.u-tokyo.ac.jp/portal/help/api
  - https://da.dl.itc.u-tokyo.ac.jp/portal/opensearch.xml
  - https://da.dl.itc.u-tokyo.ac.jp/portal/search?kywd=tokyo
  - https://da.dl.itc.u-tokyo.ac.jp/portal/assets/fbd0479b-dbb4-4eaa-95b8-f27e1c423e4b?_format=json
  - https://da.dl.itc.u-tokyo.ac.jp/portal/repo/iiif/fbd0479b-dbb4-4eaa-95b8-f27e1c423e4b/manifest
  - https://iiif.dl.itc.u-tokyo.ac.jp/iiif/2/seishu%2FA00_5995%2F001%2FA00_5995_001_0001.tif/info.json
  note: Parameters and formats transcribed from the university's own Japanese documentation page, then probed live. Where documentation and observed behaviour disagree, both are recorded.

University of Tokyo Items API

Operations 1

Documentation

Specifications

Schemas & Data

Other Resources