Open Library API: Search 20M+ Books by Title, ISBN, Author, or Subject

Open Library is the largest open book database. Its API is free and needs no key. Search by Title https://openlibrary.org/search.json?q=artificial+intelligence&limit=10 Returns: title, authors, publish year, ISBN, cover URL, edition count, ratings. Look Up by ISBN https://openlibrary.org/isbn/9780134685991.json Direct lookup with publishers, page count, cover. Browse by Subject https://openlibrary.org/subjects/machine_learning.json?limit=25 Search by Author https://openlibrary.org/search/authors.json?q=Isaac+Asimov Then get their works: /authors/OL34221A/works.json Use Cases Book recommendation engines Library catalog systems Academic research databases Reading apps with metadata AI training on book descriptions I built an Open Library Scraper on Apify — search knotless_cadence openlibrary .