ISNI validation
ISNI-16 international standard name identifier — checksum: ISO 7064 MOD 11-2. Free in your browser, or over the JSON API.
What it is
ISNI-16 international standard name identifier. CodeCheck verifies three things separately — format, length and check digit — and returns the expected and provided check digit, so a failed value tells you exactly what is wrong instead of just saying no.
Algorithm
ISO 7064 MOD 11-2. The answer is derived from the value itself, with no database lookup and no third-party call, so it is deterministic, fast and privacy-safe.
Examples
| Value | Result | Expected | Provided |
|---|---|---|---|
| 0000000121032683 | valid | 3 | 3 |
API
curl "https://<your-worker>.workers.dev/v1/validate/isni/0000000121032683"
This type has a single trailing check digit, so CodeCheck can also compute it:
GET /v1/complete/isni/{body}
Try it in the browser demo — the demo runs the same code offline.