Penguin Publishing
Books
Books, book covers and related data
No keyCORSHTTPS
Open Library Search API
Open Library provides an experimental API to search for book data. It can return data for multiple books in a single request, including Work and Edition level information, author IDs, book availability, and offers powerful sorting options.
Verified 4 days ago: 93% uptime
API key
Unconfirmed
HTTPS
Supported
Browser calls
No, needs a proxy
Status
Live · 88/100
What our checks found
- Health score
- 88/100
- Reliability
- 93%
- Average latency
- 1765ms
Last checked 2026-09-18. Measured independently, not self-reported by the provider.
How to call it
A starting template for Open Library Search API. Replace ENDPOINT with the path from the official documentation, which we link above rather than guess at.
# Authentication requirement is unconfirmed. Check the documentation before relying on this.
curl -s "https://openlibrary.org/ENDPOINT" \
-H "Authorization: Bearer YOUR_TOKEN" \
-H "Accept: application/json"This API does not send CORS headers, so a browser will block a direct call from your front end. Call it from your server, or put a small proxy in front of it.
Where this listing comes from
Aggregated from one public source (freepublicapis), then normalised and checked by us. If something here is wrong, tell us and we will correct it.
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Open Library Search API — common questions
Answered from what our own scheduled checks found, not from the provider's marketing.
Is Open Library Search API free to use?
Open Library Search API is listed in our free catalogue, but it requires some form of authentication, so you will need to register before your first call. Providers frequently reserve higher limits and commercial use for paid plans.
Does Open Library Search API need an API key?
Open Library Search API requires some form of authentication. Check the provider's documentation for which scheme it expects.
Can I call Open Library Search API from browser JavaScript?
Not directly. Open Library Search API did not return CORS headers when we checked, so the browser will block your page from reading the response even though the request itself succeeds. Call it from a server, or put a small proxy in front of it.
Is Open Library Search API still working?
Yes, as of 2026-09-18. Our automated check reached Open Library Search API and recorded a 93% reliability score with a median response time of 1765 ms. We re-check on a schedule, and this page updates with the result.
Is Open Library Search API available over HTTPS?
Yes. Open Library Search API serves over HTTPS, so you can call it from a secure page without triggering a mixed-content block.