---
name: "Catmandu::Fix::isbn13"
section: "3pm"
platform: "linux"
package: "libcatmandu-identifier-perl"
version: "0.15-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Catmandu::Fix::isbn13"
---

# Catmandu::Fix::isbn13(3pm)

normalize the isbn value of a key in 13-digit form

## NAME

Catmandu::Fix::isbn13 - normalize the isbn value of a key in 13-digit form

## SYNOPSIS

```
  # Normalize the ISBN value of isbn_field.
  # e.g. isbn_field => '1565922573'
  isbn13(isbn_field) # isbn_field => '978-1-56592-257-0'
```

## SEE ALSO

Catmandu::Fix, Catmandu::Fix::isbn10