isbn

A library to parse, validate and format ISBNs.

Getting Started

NPM

npm i @pubdate/isbn

import ISBN from '@pubdate/isbn'

ISBN.parse('2070408507').toString({ version: 'isbn13', hyphens: [true, false] }) // '978-2-07-040850-4'

CDN

<script src="https://unpkg.com/@pubdate/isbn"></script>

<script>
  ISBN.parse('2070408507').toString({ version: 'isbn13', hyphens: [true, false] }) // '978-2-07-040850-4'
</script>

Or without registration groups (5.4k instead of 27.1k)

This library can be imported with or without registration groups. Registration groups are needed to format ISBNs with hyphens and to get agency info (countryCode, langCode, ...).

Using ISBN with registration groups comes with drawbacks:

• Registration groups need to be updated frequently. This package is automatically updated daily but you may need to update your dependencies regularly.
• The version of this library with registration groups is heavier than without registration groups. 27.1k (gzipped: 7.4k) and 5.4k (gzipped: 2.2k) respectively.

NPM (without registration groups)

npm i @pubdate/isbn

import ISBN from '@pubdate/isbn/dist/isbn-without-registration-groups'

ISBN.parse('2070408507').toString({ version: 'isbn13', hyphens: [true, false] }) // '9782070408504'

CDN (without registration groups)

<script src="https://unpkg.com/@pubdate/isbn/dist/isbn-without-registration-groups"></script>

<script>
  ISBN.parse('2070408507').toString({ version: 'isbn13', hyphens: [true, false] }) // '9782070408504'
</script>

Before you start

Do not use hyphenated ISBNs as identifiers.

• Missing or outdated registration groups may result in runtime errors.
• Different versions of this package may output different hyphenated ISBN (due to registration groups being time-sensitive).

Do not use isbn10 as identifiers.

• Some ISBNs are not compatible with isbn10.

Computer-friendly

By default, toString() uses { version: 'isbn13', hyphens: false } which is future-proof and non-time-sensitive:

ISBN.parse('2070408507').toString() // '9782070408504'

Human-friendly

To display ISBNs on a web page or other documents meant to be read by humans, use { hyphens: [true, false] } to fallback and avoid errors caused by missing registration groups. And verify that the ISBN is compatible before using { version: 'isbn10' }. Or use { version: ['isbn10', 'isbn13'] } to fallback to isbn13 whenever needed.

const isbn = ISBN.parse('2070408507')

`ISBN-10: ${isbn.isCompatible({ version: 'isbn10' }) ? isbn.toString({ version: 'isbn10', hyphens: [true, false] }) : 'N/A'}`
`ISBN-10 (with fallback): ${isbn.toString({ version: ['isbn10', 'isbn13'], hyphens: [true, false] })}`
`ISBN-13: ${isbn.toString({ hyphens: [true, false] })}`

API

ISBN.parse(str)

Converts a string into an ISBN instance.

Note: Use ? as checksum if you don't know it yet.

ISBN.parse('2070408507').toString() // '9782070408504'
ISBN.parse('207040850?').toString() // '9782070408504'

ISBN.search(str)

Returns the first ISBN of a string as an ISBN instance. Or undefined when none could be found.

ISBN.search('Check these out: 9782070408500, 9784102122044, 2070408507, 9789287191908') // '9784102122044'
ISBN.search('Hello World') // undefined

ISBN.searchAll(str, { limit = Infinity })

Returns all the ISBNs of a string as ISBN instances. limit defines the maximum number of ISBNs to search for.

ISBN.searchAll('Check these out: 9782070408500, 9784102122044, 2070408507, 9789287191908') // ['9784102122044', '2070408507', '9789287191908']
ISBN.searchAll('Check these out: 9782070408500, 9784102122044, 2070408507, 9789287191908', { limit: 2 }) // ['9784102122044', '2070408507']

source

The unmodified string.

ISBN.parse('2070408507').source // '2070408507'
ISBN.parse('2-07-040850-7').source // '2-07-040850-7'
ISBN.search('Check these out: 9782070408500, 9784102122044, 2070408507, 9789287191908')?.source // '9784102122044'

version

The version (isbn10/isbn13) of the source.

ISBN.parse('2070408507').version // 'isbn10'
ISBN.parse('9782070408504').version // 'isbn13'

eanPrefix

The first 3 digits of the source for isbn13.

ISBN.parse('2070408507').eanPrefix // undefined
ISBN.parse('9782070408504').eanPrefix // '978'
ISBN.parse('9798565336375').eanPrefix // '979'

code

The part between the eanPrefix and the checksum. Without hyphens.

ISBN.parse('2070408507').code // '207040850'
ISBN.parse('978-2-07-040850-4').code // '207040850'

checksum

The last digit of the source.

ISBN.parse('2070408507').checksum // '7'
ISBN.parse('978-2-07-040850-4').checksum // '4'

isValid

Wether or not the source is valid.

Warning: Hyphens and code parts are not validated.

ISBN.parse('2070408507').isValid // true
ISBN.parse('2070408508').isValid // false

error

The reason the source is invalid. Or null when it is valid.

Warning: Hyphens and code parts are not validated.

ISBN.parse('207040850?').error // null
ISBN.parse('2070408507').error // null
ISBN.parse('2070408508').error // 'invalid_checksum'
ISBN.parse('2-07-040-850-7').error // 'invalid_format'
ISBN.parse('977207040850?').error // 'invalid_ean_prefix'

codeParts (registration groups required)

The code split in accordance with the registration group. Or null when no matching registration group could be found.

ISBN.parse('2070408507').codeParts // ['2', '07', '040850']
ISBN.parse('6699999990').codeParts // null

sourceCodeParts

The code split in accordance with the source. Or null when the source does not contain valid hyphens.

ISBN.parse('207-040-850-7').sourceCodeParts // ['207', '040', '850']
ISBN.parse('2070408507').sourceCodeParts // null
ISBN.parse('207-040850-7').sourceCodeParts // null

agency (registration groups required)

An object containing the countryCode, langCode or name of the agency. Or null when no matching registration group could be found.

ISBN.parse('4102122044').agency // { countryCode: 'JP' }
ISBN.parse('2070408507').agency // { langCode: 'FR' }
ISBN.parse('9287191905').agency // { name: 'International NGO Publishers and EU Organizations' }
ISBN.parse('6699999990').agency // null

generateChecksum({ version })

Returns the correct checksum for the specified version.

ISBN.parse('2070408507').generateChecksum({ version: 'isbn10' }) // '7'
ISBN.parse('2070408507').generateChecksum({ version: 'isbn13' }) // '4'

isCompatible({ version = 'isbn13', hyphens = false })

Wether or not the ISBN is compatible with the specified version and if the specified hyphens are supported.

ISBN.parse('2070408507').isCompatible({ version: 'isbn10' }) // true
ISBN.parse('9782070408504').isCompatible({ version: 'isbn10' }) // true
ISBN.parse('9798565336375').isCompatible({ version: 'isbn10' }) // false

ISBN.parse('2070408507').isCompatible({ hyphens: true }) // true
ISBN.parse('6699999990').isCompatible({ hyphens: true }) // false
ISBN.parse('207-040-850-7').isCompatible({ hyphens: 'source' }) // true
ISBN.parse('2070408507').isCompatible({ hyphens: 'source' }) // false

toString({ version = 'isbn13', hyphens = false }) (registration groups required for { hyphens: true })

Returns the formatted ISBN.

ISBN.parse('2070408507').toString() // '9782070408504'
ISBN.parse('2070408508').toString() // Error, invalid_source

// options.version
ISBN.parse('9782070408504').toString({ version: 'isbn10' }) // '2070408507'
ISBN.parse('9798565336375').toString({ version: 'isbn10' }) // Error, incompatible_version
// To avoid errors, use isbn13.
ISBN.parse('9782070408504').toString({ version: 'isbn13' }) // '9782070408504'
ISBN.parse('9798565336375').toString({ version: 'isbn13' }) // '9798565336375'
// To avoid errors, version can be chained (order by preferred method).
ISBN.parse('9782070408504').toString({ version: ['isbn10', 'isbn13'] }) // '2070408507'
ISBN.parse('9798565336375').toString({ version: ['isbn10', 'isbn13'] }) // '9798565336375'

// options.hyphens
// WARNING: this option is time-sensitive and may fail if _@pubdate/isbn_ is not up to date.
ISBN.parse('2070408507').toString({ hyphens: true }) // '978-2-07-040850-4'
ISBN.parse('6699999990').toString({ hyphens: true }) // Error, registration_group_not_found
// 'source' uses the position of hyphens in source.
ISBN.parse('207-040-850-7').toString({ hyphens: 'source' }) // '978-207-040-850-4'
ISBN.parse('2070408507').toString({ hyphens: 'source' }) // Error, missing_or_invalid_hyphens
// To avoid errors, hyphens can be chained (order by preferred method).
ISBN.parse('2070408507').toString({ hyphens: [true, 'source', false] }) // '978-2-07-040850-4'
ISBN.parse('669-999-999-0').toString({ hyphens: [true, 'source', false] }) // '978-669-999-999-3'
ISBN.parse('6699999990').toString({ hyphens: [true, 'source', false] }) // '9786699999993'