openbd.jp

What It Is

openBD is a Japanese bibliographic and book-cover API jointly operated by カーリル and 版元ドットコム. Its positioning is clear: it helps individuals, bookstores, libraries, media outlets, and companies retrieve book titles, authors, publishers, prices, descriptions, cover images, reviews, and other information via a high-speed API when presenting books. The source text notes that it has handled more than 5 million API requests per day, suggesting that many websites and systems have used it as part of their infrastructure.

Core Capabilities and Developer Experience

openBD provides typical REST-style endpoints, including /get?isbn=ISBN,ISBN for retrieving bibliographic records by ISBN, /coverage for checking coverage, and /schema for obtaining the JSON Schema. Its data specification is based on the core JPRO-onix fields, with additional proprietary fields from 版元ドットコム, such as book reviews, preview indicators, inventory, reprint information, NDC classification, and related books. It highlights sub-1 ms response times for individual bibliographic records, supports full data retrieval and synchronization, distributes cover images via multiple CDNs, and has planned or deployed multi-data-center edge servers. The documentation is fairly detailed in its field descriptions and usage terms, so integration is not especially difficult.

Pricing and Restrictions

The API is free to use for the purpose of “introducing books,” and it is available to individuals, organizations, and companies alike—its biggest selling point. However, this is not a fully open data license; it is a “right to use data.” Use is limited to book promotion and presentation, the usage right cannot be transferred, and users may not rent out, transfer, or sell the rights to API data. If the project operator requests removal of specific bibliographic records or cover images, users must comply promptly. The operator also does not guarantee data accuracy, continuous availability, or uninterrupted service.

Pros, Cons, and Who It’s For

Its strengths are that it is free, fast, easy to integrate, rich in bibliographic fields, and closely aligned with Japan’s publishing ecosystem. It is well suited to blogs about Japanese books, bookstore pages, library selection tools, media book-review pages, and lightweight applications. The downsides are its relatively restrictive data rights, the possibility that API specifications and terms may change, and the fact that a 2023 announcement indicated that after JPRO data stopped being distributed to 版元ドットコム, openBD v1 would end. Although the replacement API retains the same specification, its coverage and cover-image availability are expected to drop significantly.

Access from China and Alternatives

The collected text does not provide information about access from mainland China, payment, or network availability, so this remains unknown. If you are deploying a China-based service focused on Japanese books, you should test connectivity to openbd.jp and its image CDNs in advance, and design caching and fallback mechanisms. Possible alternatives include the National Diet Library book cover API, which the text describes as intended for non-profit scenarios, online bookstore APIs, and paid data from JPRO.