ISBN Decoder API
Pricing
Pay per event
Resolve any book title and/or author into every published edition with canonical ISBN-13, matching ISBN-10, retailer source attribution, and a confidence tier. Harvested from Amazon, Goodreads, OpenLibrary, WorldCat, Bol, AbeBooks.
query
Optional
Echo of the resolved input — title/author OR isbn OR olid
country
Optional
Google geo used for the SERP
language
Optional
Google UI language used for the SERP
path
Optional
Which routing path resolved this edition (A = direct OL by ISBN, B = direct OL by OLID, C = SERP, D = OL search fallback)
title
Optional
Edition title (cleaned)
isbn13
Optional
Canonical ISBN-13 (978/979 prefix, checksum validated)
isbn10
Optional
Matching ISBN-10 (null when ISBN-13 has 979 prefix)
publisher
Optional
Publisher (Open Library, when available)
publish_date
Optional
Raw publish date string from Open Library — varies in format
publish_year
Optional
Extracted 4-digit publish year (integer)
pages
Optional
Page count from Open Library
openlibrary_id
Optional
Open Library OL...M identifier
languages
Optional
ISO 639-3 language codes from Open Library
sources
Optional
Bare hostnames of every retailer + OL/Goodreads that surfaced this edition
source_count
Optional
Number of independent sources
confidence
Optional
high if >= 2 sources else medium
goodreads_top
Optional
Top Goodreads autocomplete hit (cover/rating/work_id) — denormalized on every item for this run
edition_rank
Optional
Position in the editions list (1 = most confirmed)
total_results
Optional
Raw SERP result count before extraction (0 on Path A/B/D)
duration_seconds
Optional
Total wall time
errors
Optional
Transport-level errors (captcha, HTTP) - rare
