npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@pubdate/isbn

v0.2.74

Published

A library to parse, validate and format ISBNs.

Downloads

503

Readme

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>

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'