Spec

Code snippets

curl "https://api.oanor.com/isbn-api/v1/meta" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/isbn-api/v1/meta", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/isbn-api/v1/meta");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/isbn-api/v1/meta",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "notes": "Hyphens and spaces are ignored. ISBN-10 check digit may be 'X' (=10). Only 978-prefixed ISBN-13 codes convert back to ISBN-10. For other check-digit schemes (Luhn, Verhoeff) use a check-digit API.",
        "service": "isbn-api",
        "endpoints": {
            "GET /v1/meta": "This document.",
            "GET /v1/convert": "Convert between ISBN-10 and ISBN-13.",
            "GET /v1/validate": "Validate an ISBN-10 or ISBN-13.",
            "GET /v1/checkdigit": "Compute the check digit for a 9- or 12-digit stem."
        },
        "description": "ISBN-10 / ISBN-13 validation, check-digit calculation and conversion."
    },
    "meta": {
        "timestamp": "2026-06-05T19:50:16.059Z",
        "request_id": "24ff6315-98e1-43d5-9501-1efb358872d9"
    },
    "status": "ok",
    "message": "Meta",
    "success": true
}