PASAR API

🇯🇵 National Diet Library ~ bibliographic search API

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Standards-based SRU / OpenSearch / OAI-PMH over Japan's national library catalogue; thumbnail API included.

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Call it

curl 'https://ndlsearch.ndl.go.jp/api/opensearch'

AI prompt

I'm building an app using a free Japan API (no auth needed).

API: National Diet Library ~ bibliographic search API
Provider: National Diet Library (国立国会図書館)
Endpoint: GET https://ndlsearch.ndl.go.jp/api/opensearch
It returns JSON.

Source: National Diet Library (国立国会図書館) (https://ndlsearch.ndl.go.jp/en/help/api)
Source type: Official open-data catalogue
Endpoint type: Open-data catalogue JSON
Integration difficulty: Copy-paste ready
Last checked: 2026-07-05
Production caveat: Still handle empty rows, schema changes, pagination, stale coverage, and temporary upstream failures.

Help me fetch this and build a simple page that displays it nicely. Include basic production safeguards for errors, empty responses, schema changes, caching, and rate limits.

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