Open Library
FreeLiveLast verified 24 Sept 2026
Book, edition, author and cover data crowdsourced by the Internet Archive; free lookups by ISBN or title.
Example request
curl -s 'https://openlibrary.org/search.json?q=the+lord+of+the+rings&limit=1'
Free tier, in plain English
No key or signup needed. Sending a descriptive User-Agent header triples the allowed request rate.
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