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Help : Use of bibliographic data & API

Frequently asked questions

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Q
What kind of bibliographic products are available ?
A
Bibliographic data for materials and digital contents held by National Diet Library is available from The National Diet Library Online Search and Request Service (NDL Online).
Bibliographic data for materials in the National Diet Library holdings is available from NDL-Bib.
In addition to our holdings, bibliographic data for materials from the collections of various institutions including public libraries is available from NDL Search.

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Q
Can bibliographic data be purchased?
A
JAPAN/MARC (a machine-readable version of the Japanese National Bibliography) is distributed for a fee. In addition, it is also possible to use RSS feeds, the NDL Search API, and the download function of NDL-Bib to get bibliographic data free of charge.

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Q
I would like to obtain and use bibliographic data. Do I need to apply for this etc.?
A
If you need this for commercial purposes or to acquire a very large amount of data, please contact the Library (in Japanese).
If you wish to download bibliographic data from NDL-Bib and use this in your own library system, please refer to: "Use of NDL-Bib bibliographic data at public libraries" (in Japanese).
If you wish to use the NDL Search API, please refer to the page "The outside offer interface (API)" (linked to NDL Search).

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Q
What should I do to use an externally-provided interface (API)?
A
An API is offered as part of NDL Search. For more information, please refer to the page "The outside offer interface (API)" (linked to NDL Search).

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Q
Are there any statistics on bibliographic data?
A
Please refer to: "Statistics of bibliographic data" (in Japanese).

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Q
What is the "Japanese National Bibliography"?
A
This is for broadly and rapidly reporting (both in Japan and abroad) the standard bibliographic data for publications acquired and cataloged by the National Diet Library.
It consists of domestic Japanese publications deposited through the legal deposit system, as well as Japanese publications acquired (donated, purchased, etc.) by methods other than the legal deposit system, and foreign publications in Japanese.

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