Data from the HelMet libraries’ catalogue in a machine-readable format. The data source contains the descriptions of approximately 680,000 books, records, sheet music publications and other materials found in the Helmet library system (the city libraries of Helsinki, Espoo, Vantaa and Kauniainen).
No new Helmet catalogue is available at this time. However, the National Library’s [Finna portal](https://finna.fi/OrganisationInfo/Home?id=Helmet&lng=en-gb) has an open [API](https://api.finna.fi/swagger-ui/?url=%2Fapi%2Fv1%3Fswagger) through which you can search for the material data of Helmet libraries.
Additional information about Finna’s API:
https://www.kiwi.fi/pages/viewpage.action?pageId=53839221
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FAQ
Frequently Asked Questions
Some basic informations about API Store ®.
Operation and development of APIs are currently fully funded by company Apitalks and its usage is for free.
Yes, you can.
All important information such as time of last update, license and other information are in response of each API call.
In case of major update that would not be compatible with previous version of API, we keep for 30 days both versions so you will have enough time to transfer to new version. We will inform you about the changes in advance by e-mail.