---
title: "ISBN-10/13 lookup returning a normalized book record (title, authors, publisher, pages)"
method: GET
path: "/v1/books/isbn"
---

# ISBN-10/13 lookup returning a normalized book record (title, authors, publisher, pages)

`GET /v1/books/isbn`

## Request

- Base URL: `https://data.greeneris.io` (the document declares no server; this is the origin it was published from)
- URL: `https://data.greeneris.io/v1/books/isbn`
- Auth: none declared

Resolves an ISBN-10 or ISBN-13 to a normalized bibliographic record from Open Library (Internet Archive): title, authors, publishers, publish date, page count, ISBN identifiers, subjects and cover image URL. Query: ?isbn=9780140328721 (hyphens/spaces tolerated). Unknown ISBNs return 400 (not charged). 7-day cache. Built for catalog management, e-commerce listings and used-book pricing agents.

## Query parameters

- `isbn` string, required

## Response `200`

Successful response

- unknown

---

[API](https://skmtc.dev/greeneris/apis/eu-verify.md) · [All operations](https://skmtc.dev/greeneris/apis/eu-verify/llms.txt) · [OpenAPI document](https://skmtc.dev/greeneris/apis/eu-verify/revisions/766cf4a67d8f?raw)