riomyers/libphonenumber-js

A simpler (and smaller) rewrite of Google Android's libphonenumber library

libphonenumber-js

A simpler and smaller rewrite of Google Android's libphonenumber library: easy phone number parsing and formatting in javascript.

See Demo

LibPhoneNumber

libphonenumber is a phone number formatting and parsing library released by Google, originally developed for (and currently used in) Google's Android mobile phone operating system.

libphonenumber-js is a "lighter" pure javascript rewrite of the original libphonenumber library (written in C++ and Java because those are the programming languages used in Android OS). While libphonenumber has an official autogenerated javascript port which is being maintained by Google, it is tightly coupled to Google's closure javascript utility framework. It can still be compiled into one gigantic bundle which weighs 530 kilobytes (330 kB code + 200 kB metadata) — quite a size for a simple phone number input field on a casual website.

One part of me was curious about how all this phone number parsing and formatting machinery worked, and another part of me was curious if there was a way to reduce those 530 kilobytes to something more reasonable while also getting rid of all the unnecessary bulk and rewriting it all in pure javascript. The resulting library does everything a modern web application needs while maintaining a much smaller size of about 110 kilobytes.

Difference from Google's libphonenumber

• Much smaller footprint: 110 kilobytes (30 kB code + 80 kB sufficient metadata) vs the original Google's 530 kilobytes (330 kB code + 200 kB full metadata).
• Can search for phone numbers in text (Google's autogenerated javascript port can't).
• Doesn't parse alphabetic phone numbers like 1-800-GOT-MILK.
• Doesn't use "carrier codes" when formatting numbers: "carrier codes" are only used in Colombia and Brazil and only when dialing within those countries from a mobile phone to a fixed line number.
• Doesn't parse or format special local-only phone numbers: emergency phone numbers like 911, "short codes", numbers starting with a *, etc.

Install

via npm

$ npm install libphonenumber-js --save

via yarn

$ yarn add libphonenumber-js

If you're not using a bundler then use a standalone version from a CDN.

Use

Parse phone number

import { parseNumber } from 'libphonenumber-js'

parseNumber('Phone: 8 (800) 555 35 35.', 'RU')
// Outputs: { country: 'RU', phone: '8005553535' }

Format phone number

import { formatNumber } from 'libphonenumber-js'

formatNumber('+12133734253', 'International')
// Outputs: '+1 213 373 4253'

formatNumber('+12133734253', 'National')
// Outputs: '(213) 373-4253'

formatNumber({ country: 'US', phone: '2133734253' }, 'International')
// Outputs: '+1 213 373 4253'

formatNumber({ country: 'US', phone: '2133734253' }, 'National')
// Outputs: '(213) 373-4253'

"As You Type" formatter

import { AsYouType } from 'libphonenumber-js'

new AsYouType().input('+12133734')
// Outputs: '+1 213 373 4'

new AsYouType('US').input('2133734')
// Outputs: '(213) 373-4'

Full-text search

import { findNumbers } from 'libphonenumber-js'

findNumbers(`
  The number is +7 (800) 555-35-35 and
  not (213) 373-4253 as written
  in the document.
`, 'US')

// Outputs:
//
// [{
//   phone    : '8005553535',
//   country  : 'RU',
//   startsAt : 14,
//   endsAt   : 32
// }, {
//   phone    : '2133734253',
//   country  : 'US',
//   startsAt : 41,
//   endsAt   : 55
// }]

Definitions

Country code

"Country code" means either a two-letter ISO country code (like US) or a special 001 country code used for non-geographical entities (as per Google's libphonenumber library). For example, +7 800 555 35 35 phone number belongs to Russia so it has RU country code where as +800 1 1111 1111 phone number could belong to any country so it has 001 country code.

National (significant) number

"National (significant) number" are the national phone number digits (without "national prefix"). For example, +1 213 373 4253 (or (213) 373-4253 in national format) is a US phone number and its national (significant) number is 213 373 4253. Another example is +33 1 45 45 32 45 (or 01 45 45 32 45 in national format) which is a French phone number where they add 0 "national prefix" when writing phone numbers in national format; in this case the national (significant) number is 1 45 45 32 45.

Country calling code

"Country calling code" are the digits between the + and the national (significant) number when the number is written in international format. E.g. for US country calling code is 1 and for France it's 33.

API

parseNumber(text, [defaultCountry], [options])

Attempts to parse a phone number from text.

If defaultCountry is passed then it's gonna be the default country for parsing non-international phone numbers.

Returns { country, phone, ext } object where

• country is a country code.
• phone is a national (significant) number.
• ext is a phone number extension.

// Parses international numbers.
parseNumber('+1 213 373 4253') === { country: 'US', phone: '2133734253' }
parseNumber('Phone: +1-213-373-4253.') === { country: 'US', phone: '2133734253' }
parseNumber('+12133734253') === { country: 'US', phone: '2133734253' }

// Parses national numbers provided a default country.
parseNumber('Phone: (213) 373-4253.', 'US') === { country: 'US', phone: '2133734253' }

// Parses phone number extensions.
parseNumber('(213) 373-4253 ext. 123', 'US') === { country: 'US', phone: '2133734253', ext: '123' }

// Parses RFC 3966 phone number URIs.
parseNumber('tel:+78005553535;ext=123') === { country: 'RU', phone: '8005553535', ext: '123' }

If the phone number supplied isn't valid then an empty object {} is returned.

parseNumber('+1 111 111 1111') === {}
parseNumber('(111) 111-1111', 'US') === {}
parseNumber('abcdefg') === {}

Available options:

• defaultCountry : string — Same as the defaultCountry argument.

• extended : boolean — If set to true then parseNumber() will attempt to parse even a remotely hypothetical phone number even if it is considered "invalid".

The result of "extended" parsing is an object where

• country is a country code.
• phone is a national (significant) number.
• ext is a phone number extension.
• countryCallingCode is a country calling code.
• carrierCodes are only used in Colombia and Brazil and only when dialing within those countries from a mobile phone to a fixed line number.
• valid: boolean — whether it's a "valid" (real) phone number.
• possible: boolean — a phone number is considered "possible" when it fits the phone number length rules for a given country. E.g. for US national (significant) number regexp is [2-9]\d{9} and possible national (significant) number length is 10 so a phone number (111) 111-1111 is not a "valid" number because it doesn't match the US national (significant) number regexp but it is a "possible" number because it's 10 digits long.
• Some or all of these properties may be absent from the result object.

// If the number is valid.
parseNumber('Phone: (213) 373-4253.', 'US', { extended: true }) ===
{
  country: 'US',
  phone: '2133734253',
  ext: undefined,
  countryCallingCode: 1,
  carrierCode: undefined,
  valid: true,
  possible: true
}

// If the number is not "valid" but "possible".
parseNumber('(111) 111-1111', 'US', { extended: true }) ===
{
  country: 'US',
  phone: '1111111111',
  ext: undefined,
  countryCallingCode: 1,
  carrierCode: undefined,
  valid: false,
  possible: true
}

// If the number is not "valid" but "possible"
// and country can't be derived from it.
// (e.g. can't tell if it's a US number or a Canadian number)
parseNumber('+1 111 111 1111', { extended: true }) ===
{
  country: undefined,
  phone: '1111111111',
  ext: undefined,
  countryCallingCode: 1,
  carrierCode: undefined,
  valid: false,
  possible: true
}

// If the number is not "possible" (invalid length).
parseNumber('(213) 373', 'US', { extended: true }) ===
{
  country: 'US',
  phone: '213373',
  ext: undefined,
  countryCallingCode: 1,
  carrierCode: undefined,
  valid: false,
  possible: false
}

// In some cases if the number is extremely not "possible"
// then an empty object `{}` is returned.
//
// Too short (or too long) for any country's phone number.
parseNumber('1', 'US', { extended: true }) === {}
// Non-existent country calling code.
parseNumber('+210', { extended: true }) === {}
// No phone number found.
parseNumber('abcdefg', 'US', { extended: true }) === {}

The "extended" parsing mode is the default behaviour of the original Google's libphonenumber: it still returns parsed data even if the phone number being parsed is not considered valid (but is kinda "possible"). I guess this kind of behaviour is better for crawling websites for phone numbers because when mining "big data" it is better to extract all possible info rather than discard some pieces of it prematurely, e.g. when national (significant) number regexp for some country gets outdated which might very well happen because phone numbering plans are changing constantly around the world. Maybe after all it would make sense to make the "extended" parsing mode the default one in the next major version. I guess it would.

Sometimes users icorrectly input phone numbers in "out-of-country" dialing (IDD-prefixed) format instead of the proper international phone number format (the "+" notation). In such cases parseNumber() will attempt to parse such IDD-prefixed numbers if "default country" is provided:

// International format.
parseNumber('+61 2 3456 7890') === { country: 'AU', phone: '234567890' }
// IDD-prefixed format.
parseNumber('011 61 2 3456 7890', 'US') === { country: 'AU', phone: '234567890' }

formatNumber(number, format, [options])

Formats a number into a string according to a format.

Available formats:

• National — e.g. (213) 373-4253
• International — e.g. +1 213 373 4253
• E.164 — e.g. +12133734253
• RFC3966 (the phone number URI) — e.g. tel:+12133734253;ext=123
• IDD — "Out-of-country" dialing format, e.g. 01178005553535 for +7 800 555 35 35 being called out of options.fromCountry === US. If no options.fromCountry was passed or if there's no default IDD prefix for options.fromCountry then returns undefined. Pass options.humanReadable: true for a human-readable output (same output as Google liphonenumber's formatOutOfCountryCallingNumber()).

The number argument must be either a result of parseNumber() function call (to strip national prefix) or an E.164 phone number string (e.g. +12133734253).

// Formats E.164 phone numbers.
formatNumber('+12133734253', 'National') === '(213) 373-4253'
formatNumber('+12133734253', 'International') === '+1 213 373 4253'

// Formats E.164 phone numbers when
// they're not "valid" but still "possible".
formatNumber('+11111111111', 'National') === '(111) 111-1111'
formatNumber('+11111111111', 'International') === '+1 111 111 1111'

// Formats E.164 phone numbers when
// they're not "valid" and not "possible" (invalid length).
formatNumber('+11111', 'National') === '1111'
formatNumber('+11111', 'International') === '+1 1111'

// Formats a result of `parseNumber()` function call.
const parsedNumber = parseNumber('2133734253', 'US')
formatNumber(parsedNumber, 'National') === '(213) 373-4253'
formatNumber(parsedNumber, 'International') === '+1 213 373 4253'

// Formats a result of `parseNumber()` function call in "extended" mode
// when it's not a "valid" number but is still a "possible" one.
const possibleNumber = parseNumber('+11111111111', { extended: true })
formatNumber(possibleNumber, 'National') === '(111) 111-1111'
formatNumber(possibleNumber, 'International') === '+1 111 111 1111'

// Formats a result of `parseNumber()` function call in "extended" mode
// when it's neither a "valid" number nor a "possible" one (invalid length).
const possibleNumber = parseNumber('+11111', { extended: true })
formatNumber(possibleNumber, 'National') === '1111'
formatNumber(possibleNumber, 'International') === '+1 1111'

// Formats phone number extensions.
formatNumber({ country: 'US', phone: '2133734253', ext: '123' }, 'National') ===  '(213) 373-4253 ext. 123'

// When given an object not having `phone` property
// (e.g. a empty object `{}`) it will throw.
formatNumber({}) throws Error

Available options:

{
  formatExtension(number, extension) — Formats `number` and `extension` into a string.
                                       By default returns `${number} ext. ${extension}`
                                       for almost all countries with rare exceptions of
                                       some special cases like `${number} x${extension}` for UK.
}

class AsYouType(defaultCountry)

Creates a formatter for a partially entered phone number. The defaultCountry is optional and, if specified, is gonna be the default country for formatting non-international phone numbers. The formatter instance provides two methods:

• input(text) — Takes any text, parses it and appends the digits to the input. Returns the formatted phone number.
• reset() — Resets the input.

new AsYouType().input('+12133734') === '+1 213 373 4'
new AsYouType('US').input('2133734') === '(213) 373-4'

The formatter instance also provides the following getters:

• country — Phone number country.
• getNationalNumber() — Returns the national (significant) number part of the phone number.
• getTemplate() — Returns the template used to format the output (or undefined). Digits (and the + sign, if present) are denoted by x-es.

// National phone number input example.

const asYouType = new AsYouType('US')

asYouType.input('2') === '2'
asYouType.getNationalNumber() === '2'
asYouType.getTemplate() === 'x'

asYouType.input('1') === '21'
asYouType.getNationalNumber() === '21'
asYouType.getTemplate() === 'xx'

asYouType.input('3') === '(213)'
asYouType.getNationalNumber() === '213'
asYouType.getTemplate() === '(xxx)'

asYouType.input('3734253') === '(213) 373-4253'
asYouType.getNationalNumber() === '2133734253'
asYouType.getTemplate() === '(xxx) xxx-xxxx'

// International phone number input example.

const asYouType = new AsYouType()
asYouType.input('+1-213-373-4253') === '+1 213 373 4253'
asYouType.country === 'US'
asYouType.getNationalNumber() === '2133734253'
asYouType.getTemplate() === 'xx xxx xxx xxxx'

"As You Type" formatter was created by Google as part of their Android OS and therefore only works for numerical keyboard input, i.e. it can only accept digits (and a + sign in the start of an international number). When used on desktops where a user can input all kinds of punctuation (spaces, dashes, parens, etc) it simply ignores everything except digits (and a + sign in the start of an international number).

Google's "As You Type" formatter does not support entering phone number extensions. If your project requires phone number extensions input then use a separate input field for that.

findNumbers(text, [defaultCountry], [options])

Searches for phone numbers in a given text.

import { findNumbers } from 'libphonenumber-js'

findNumbers(`
  The number is +7 (800) 555-35-35 and
  not (213) 373-4253 as written
  in the document.
`, 'US')

// Outputs:
//
// [{
//   phone    : '8005553535',
//   country  : 'RU',
//   startsAt : 14,
//   endsAt   : 32
// },
// {
//   phone    : '2133734253',
//   country  : 'US',
//   startsAt : 41,
//   endsAt   : 55
// }]

By default it processes the whole text and then outputs the phone numbers found. If the text is very big (say, a hundred thousand characters) then it might freeze the user interface for a couple of seconds. To avoid such lags one can employ iterators to perform the search asynchronously (e.g. using requestIdleCallback or requestAnimationFrame).

ES6 iterator:

import { searchNumbers } from 'libphonenumber-js'

const text = `
  The number is +7 (800) 555-35-35 and
  not (213) 373-4253 as written
  in the document.
`

async function() {
  for (const number of searchNumbers(text, 'US')) {
    console.log(number)
    await new Promise(resolve => setTimeout(resolve, 0))
  }
  console.log('Finished')
}

Java-style iterator (for those still not using ES6):

import { PhoneNumberMatcher } from 'libphonenumber-js'

const matcher = new PhoneNumberMatcher(`
  The number is +7 (800) 555-35-35 and
  not (213) 373-4253 as written
  in the document.
`, {
  defaultCountry: 'US'
})

// Search cycle iteration.
const iteration = () => {
  if (matcher.hasNext()) {
    console.log(matcher.next())
    setTimeout(iteration, 0)
  } else {
    console.log('Finished')
  }
}

// Run the search.
iteration()

Although Google's javascript port doesn't have the findNumbers() functionality the Java and C++ ports do. I guess Google just doesn't need to crawl phone numbers on Node.js because they can afford to hire a Java/C++ developer to do that. Still, javascript nowadays is the most popular programming language given its simplicity and user-friendliness. The findNumbers() function provided is a port of Google's PhoneNumberMatcher.java into javascript.

getNumberType(number, [defaultCountry])

Determines phone number type (fixed line, mobile, toll free, etc). This function will work if --extended (or relevant --types) metadata is available (see Metadata section of this document). The regular expressions used to differentiate between various phone number types consume a lot of space (two thirds of the total size of the --extended library build) therefore they're not included in the bundle by default.

The number argument can be either a result of the parseNumber() function call — { country, phone } — or a string (phone number digits only) possibly accompanied with the second defaultCountry argument.

getNumberType('+79160151539') === 'MOBILE'
getNumberType('9160151539', 'RU') === 'MOBILE'
getNumberType({ phone: '9160151539', country: 'RU' }) === 'MOBILE'

isValidNumber(number, [defaultCountry])

Checks if a phone number is valid, the validation is more strict than parseNumber().

The number argument can be either a result of the parseNumber() function call — { country, phone } — or a string (phone number digits only) possibly accompanied with the second defaultCountry argument.

isValidNumber('+12133734253') === true
isValidNumber('+1213373') === false

isValidNumber('2133734253', 'US') === true
isValidNumber('21337', 'US') === false

isValidNumber({ phone: '2133734253', country: 'US' }) === true

The difference between using parseNumber() and isValidNumber() for phone number validation is that isValidNumber() also checks the precise regular expressions of possible phone numbers for a country. For example, for Germany parseNumber('123456', 'DE') would return { country: 'DE', phone: '123456' } because this phone number matches the general phone number rules for Germany. But, if the metadata is compiled with --extended (or relevant --types) flag (see Metadata section of this document) then isValidNumber() is gonna use those precise regular expressions for extensive validation and isValid('123456', 'DE') will return false because the phone number 123456 doesn't actually exist in Germany.

This is how it is implemented in the original Google's libphonenumber: parseNumber() parses phone numbers and loosely validates them while isValidNumber() validates phone numbers precisely (provided the precise regular expressions are included in metadata).

The precise regular expressions aren't included in the default metadata because that would cause the default metadata to grow twice in its size: the complete ("full") metadata size is about 145 kilobytes while the reduced ("default") metadata size is about 77 kilobytes. Hence in the default configuration isValidNumber() performs absolutely the same "lite" validation as parseNumber(). For enabling extensive phone number validation the simplest way is to import functions from libphonenumber-js/custom module and supply them with libphonenumber-js/metadata.full.json. For generating custom metadata see the instructions provided in the Customizing metadata section of this document.

The optional defaultCountry argument is the default country, i.e. it does not restrict to just that country, e.g. in those cases where several countries share the same phone numbering rules (NANPA, Britain, etc). For example, even though the number 07624 369230 belongs to the Isle of Man ("IM" country code) calling isValidNumber('07624369230', 'GB') still returns true because the country is not restricted to GB, it's just that GB is the default one for the phone numbering rules. For restricting the country see isValidNumberForRegion() though restricting a country might not be a good idea.

// Even though '07624 369230' number belongs to the Isle of Man ("IM")
// the `defaultCountry` argument "GB" still works here because
// "GB" and "IM" both share the same phone numbering rules ("+44").
isValidNumber('07624369230', 'GB') === true
isValidNumber('07624369230', 'IM') === true

// Imposing country restrictions.
isValidNumberForRegion('07624369230', 'GB') === false
isValidNumberForRegion('07624369230', 'IM') === true

Using phone number validation feature

I personally wouldn't rely on strict phone number validation too much because it might get outdated:

• First, new phone number rules are added to Google's libphonenumber library after they have already been implemented in real life (which introduces a delay).

• From time to time those new rules from Google's libphonenumber are updated in this library.

• And then there's still the web application itself using this library and until a developer installs libphonenumber-js@latest manually and redeploys the web application it's gonna use the old (potentially outdated) phone number validation rules which could result in losing customers with perfectly valid (but not yet supported) phone numbers if a website form is too strict about validating user's input.

Phone number validation rules are constantly changing for --extended rules and are fairly static for "general" ones. Still imagine a web application (e.g. a promosite or a "personal website") being deployed once and then running for years without any maintenance.

getCountryCallingCode(country)

There have been requests for a function returning a country calling code by country code.

getCountryCallingCode('RU') === '7'
getCountryCallingCode('IL') === '972'

getExtPrefix(country)

Returns phone number extension prefix for a given country. If no custom ext prefix is defined for a country then the default " ext. " prefix is returned.

getExtPrefix('US') === ' ext. '
getExtPrefix('GB') === ' x'

parseIncompletePhoneNumber(text)

Parses phone number characters (+ and digits). Can be used for building a phone number input component (e.g. react-phone-number-input).

parseIncompletePhoneNumber('8 (800) 555') === '8800555'
parseIncompletePhoneNumber('+7 800 555') === '+7800555'
parseIncompletePhoneNumber('+٤٤٢٣٢٣٢٣٤') === '+442323234'

formatIncompletePhoneNumber(value, country)

Formats incomplete phone number as a national one for a given country. If country is not specified then outputs the phone number in international format. This is just an alias for new AsYouType(country, metadata).input(value). Can be used for building a phone number input component (e.g. react-phone-number-input).

formatIncompletePhoneNumber('8800555', 'RU') === '8 (800) 555'
formatIncompletePhoneNumber('+7800555') === '+7 800 555'

React

There's also a React component utilizing this library — react-phone-number-input (or without country select).

Examples

For those asking for phone number examples for use in <input placeholder/>s: see libphonenumber-js/examples.mobile.json.

Bug reporting

When reporting an issue one must also provide a link to Google's libphonenumber demo page illustrating the expected behaviour. This includes validation, parsing, formatting and "as you type" formatting. For example, for an Australian number 438 331 999 Google's demo outputs four sections — "Parsing Result", "Validation Results", "Formatting Results" and "AsYouTypeFormatter Results". In a bug report, first describe the observed libphonenumber-js demo result and then Google's demo result (with a link to it) which must differ from the observed libphonenumber-js demo result. If the observed libphonenumber-js demo result is the same as Google's demo result and you don't agree with Google's demo result then create an issue in Google's repo.

Phone number validation bugs should only be reported if they appear when using custom metadata functions fed with metadata.full.json because by default all functions in this library use the reduced metadata set which results in looser validation than the original Google libphonenumber's. The demo page also uses the reduced metadata set and therefore its validation is also looser than the original Google libphonenumber's.

There is also a possibility of this library's demo metadata being outdated, or this library's metadata lagging behind Google's (I have to update it manually from time to time due to ssh-agent not working properly on Windows).

There also have been cases when Google's demo wasn't updated to the latest metadata and showed incorrect results. So Google's demo is not a reliable source of truth.

TypeScript

TypeScript support for this library is entirely community-driven. I myself don't use TypeScript. Send your pull requests.

CDN

One can use any npm CDN service, e.g. unpkg.com or jsdelivr.net

<script src="https://unpkg.com/libphonenumber-js/bundle/libphonenumber-js.min.js"></script>

<script>
  alert(new libphonenumber.AsYouType('US').input('213-373-4253'))
</script>

Metadata

Metadata is generated from Google's original PhoneNumberMetadata.xml by transforming XML into JSON and removing unnecessary fields.

The metadata update process is automated through an "autoupdate" script (see ./autoupdate.sh or ./autoupdate.cmd). The script detects changes to PhoneNumberMetadata.xml in Google libphonenumber's repo and if there are changes then it pulls the latest metadata, processes it, commits the changes to GitHub, builds a new version of the library and releases it to NPM. So this library's metadata is supposed to be up-to-date. I could set up this script to run automatically but on my Windows machine ssh-agent doesn't work properly so I run the "autoupdate" script manually from time to time.

Customizing metadata

This library comes prepackaged with three flavours of metadata

• metadata.full.json — contains everything, including all regular expressions for precise phone number validation and getting phone number type, but weighs 145 kilobytes.
• metadata.min.json — (default) the minimal one, doesn't contain regular expressions for precise phone number validation and getting phone number type, weighs 80 kilobytes.
• metadata.mobile.json — contains regular expressions for precise mobile phone number validation, weighs 105 kilobytes.

Furthermore, if only a specific set of countries is needed in a project, and a developer really wants to reduce the resulting bundle size, say, by 50 kilobytes (even when including all regular expressions for precise phone number validation and getting phone number type), then he can generate such custom metadata and pass it as an extra argument to this library's functions.

First, add metadata generation script to your project's package.json

{
  "scripts": {
    "libphonenumber-metadata": "libphonenumber-generate-metadata metadata.min.json --countries RU,DE --extended",
  }
}

And then run it like npm run libphonenumber-metadata.

The arguments are

• The first argument is the output metadata file path.
• --countries argument is a comma-separated list of the countries included (if --countries is omitted then all countries are included).
• --extended argument may be passed to include all regular expressions for precise phone number validation and getting phone number type, which increases the precision of phone number validation but at the same time it will enlarge the resulting metadata size approximately twice.
• --types ... argument may be passed instead of --extended to only include the precise phone number type regular expressions for a specific set of phone number types (a comma-separated list, e.g. --types mobile,fixed_line). The complete list of phone number types.

Then use the generated metadata.min.json with the exported "custom" functions.

In ES6 that would be

import {
  parseNumber,
  formatNumber,
  isValidNumber,
  getNumberType,
  AsYouType
} from 'libphonenumber-js/custom'

import metadata from 'libphonenumber-js/metadata.full.json'

parseNumber('+78005553535', metadata)
formatNumber({ phone: '8005553535', country: 'RU' }, metadata)
isValidNumber('+78005553535', metadata)
getNumberType('+78005553535', metadata)
new AsYouType('RU', metadata).input('+78005553535')

or

import {
  parseNumber as parseNumberCustom,
  formatNumber as formatNumberCustom,
  isValidNumber as isValidNumberCustom,
  getNumberType as getNumberTypeCustom,
  AsYouType as AsYouTypeCustom
} from 'libphonenumber-js/custom'

export const parseNumber = (...args) => parseNumberCustom(...args, metadata)
export const formatNumber = (...args) => formatNumberCustom(...args, metadata)
export const isValidNumber = (...args) => isValidNumberCustom(...args, metadata)
export const getNumberType = (...args) => getNumberTypeCustom(...args, metadata)

export class AsYouType extends AsYouTypeCustom {
  constructor(country) {
    super(country, metadata)
  }
}

And for Common.js environment that would be

var custom = require('libphonenumber-js/custom')
var metadata = require(libphonenumber-js/metadata.full.json)

exports.parseNumber = function parseNumber() {
  var parameters = Array.prototype.slice.call(arguments)
  parameters.push(metadata)
  return custom.parseNumber.apply(this, parameters)
}

exports.formatNumber = function formatNumber() {
  var parameters = Array.prototype.slice.call(arguments)
  parameters.push(metadata)
  return custom.formatNumber.apply(this, parameters)
}

exports.isValidNumber = function isValidNumber() {
  var parameters = Array.prototype.slice.call(arguments)
  parameters.push(metadata)
  return custom.isValidNumber.apply(this, parameters)
}

exports.getNumberType = function isValidNumber() {
  var parameters = Array.prototype.slice.call(arguments)
  parameters.push(metadata)
  return custom.getNumberType.apply(this, parameters)
}

exports.AsYouType = function AsYouType(country) {
  custom.AsYouType.call(this, country, metadata)
}

exports.AsYouType.prototype = Object.create(custom.AsYouType.prototype, {})
exports.AsYouType.prototype.constructor = exports.AsYouType

Metadata should be re-generated each time the project is being deployed because Google constantly updates their metadata.

Maintenance

Google periodically releases new metadata with the changes described in the release notes. Sometimes those are minor non-breaking updates, sometimes those are major-version breaking updates. The metadata should be periodically updated via autoupdate.cmd (Windows) and autoupdate.sh (Linux/macOS) scripts. Also Google sometimes (very rarely) updates their code: phonenumberutil.js (parseNumber(), formatNumber(), isValidNumber(), getNumberType()), asyoutypeformatter.js (AsYouType), PhoneNumberMatcher (findNumbers()). The latest sync-up was performed on August 1st, 2018.

Contributing

After cloning this repo, ensure dependencies are installed by running:

npm install

This module is written in ES6 and uses Babel for ES5 transpilation. Widely consumable JavaScript can be produced by running:

npm run build

Once npm run build has run, you may import or require() directly from node.

After developing, the full test suite can be evaluated by running:

npm test

When you're ready to test your new functionality on a real project, you can run

npm pack

It will build, test and then create a .tgz archive which you can then install in your project folder

npm install [module name with version].tar.gz

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License

MIT