libphonenumber-js


A simpler and smaller rewrite of Google Android's libphonenumber library in javascript.

See Demo

If you’re trying to build a React component with it, take a look at react-phone-number-input.

LibPhoneNumber

Google's libphonenumber is an ultimate phone number formatting and parsing library developed by Google for Android) phones. It is written in C++ and Java, and, while it has an official autogenerated javascript port, that port is tightly coupled to Google's closure javascript framework, and, when compiled into a bundle, weighs about 550 kB (350 kB code + 200 kB metadata).

With many websites today asking for user's phone number, the internet could benefit from a simpler and smaller library that would just get the parsing and formatting right, and that's what libphonenumber-js is.

Difference from Google's libphonenumber

* Smaller footprint: 145 kB (65 kB code + 80 kB sufficient metadata) vs the original Google's 550 kB (350 kB code + 200 kB full metadata).

* Can search for phone numbers in text (Google's autogenerated javascript port can't).

* Aims at parsing and formatting people's phone numbers while skipping all other "special" cases like:

* Emergency phone numbers like 911.

* "Short codes": short SMS-only numbers like 12345.

Numbers starting with a , like *555.

* Alphabetic phone numbers like 1-800-GOT-MILK: people don't input their phone numbers like that, it's only used in advertisement.

* "Two-in-one" phone numbers with "combined" extensions like (530) 583-6985 x302/x2303 that in fact represent two separate phone numbers, because the library can only return a single phone number when parsing a string.

* Overall, doesn't support formatting non-"conventional" numbers like numbers with the "area code" omitted or "alternative" "short" numbers like Australian 13-smart numbers. For example, when dialing phone numbers within the same "area", people sometimes skip the "area code", and dial, say, 456-789 instead of (123) 456-789. Google's libphonenumber supports formatting such numbers (with "area code" omitted) because it is used for dialing on the Android phone operating system. Because libphonenumber-js isn't a phone operating system and is not used for actual dialing — only for inputting internationally-dialable personal phone numbers — it doesn't format such "short" phone numbers because it doesn't need to support those.

* Any other "miscellaneous" cases that're considered irrelevant for the task.

* Doesn't provide "geolocation" by a phone number.

* Doesn't use hyphens or brackets when formatting international phone numbers, only whitespace (seems more logical this way).

* Doesn't set .country to "001" when parsing "non-geographic" phone numbers (like mobile satellite communications services). Instead, .country is undefined in those cases, and a developer can call .isNonGeographic() method of the PhoneNumber instance to find out whether the parsed phone number is a "non-geographic" one.

* Doesn't provide the equivalent of libphonenumber's formatNumberForMobileDialing() function that formats a number for dialing using a mobile phone within the country: dialing local numbers from a mobile phone is a bit more complicated in some countries like Brazil or Colombia where they require adding "carrier codes" when making a call. Since libphonenumber-js is not a dialing library (we're not Android phone operaing system), it doesn't prepend any "carrier codes" when formatting phone numbers, though it does parse such "carrier codes" correctly.

GitHub

On March 9th, 2020, GitHub, Inc. silently banned my account (erasing all my repos, issues and comments, even in my employer's private repos) without any notice or explanation. Because of that, all source codes had to be promptly moved to GitLab. The GitHub repo is now only used as a backup (you can star the repo there too), and the primary repo is now the GitLab one. Issues can be reported in any repo.

Install

via npm

``sh
$ npm install libphonenumber-js --save
`

via yarn

`sh
$ yarn add libphonenumber-js
`

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

Use

$3

`js
import parsePhoneNumber from 'libphonenumber-js'

const phoneNumber = parsePhoneNumber(' 8 (800) 555-35-35 ', 'RU')
if (phoneNumber) {
phoneNumber.country === 'RU'
phoneNumber.number === '+78005553535'
phoneNumber.isPossible() === true
phoneNumber.isValid() === true
// Note: .getType() requires /max metadata: see below for an explanation.
phoneNumber.getType() === 'TOLL_FREE'
}
`

$3

`js
import {
isPossiblePhoneNumber,
isValidPhoneNumber,
validatePhoneNumberLength
} from 'libphonenumber-js'

isPossiblePhoneNumber('8 (800) 555-35-35', 'RU') === true
isValidPhoneNumber('8 (800) 555-35-35', 'RU') === true

validatePhoneNumberLength('8 (800) 555', 'RU') === 'TOO_SHORT'
validatePhoneNumberLength('8 (800) 555-35-35', 'RU') === undefined // Length is valid.
`

isPossiblePhoneNumber() only validates phone number length, while isValidPhoneNumber() validates both phone number length and the actual phone number digits.

validatePhoneNumberLength() is just a more detailed version of isPossiblePhoneNumber() — if the phone number length is invalid, it returns the actual reason: TOO_SHORT, TOO_LONG, etc.

$3

`js
import parsePhoneNumber from 'libphonenumber-js'

const phoneNumber = parsePhoneNumber('+12133734253')

phoneNumber.formatInternational() === '+1 213 373 4253'
phoneNumber.formatNational() === '(213) 373-4253'
phoneNumber.getURI() === 'tel:+12133734253'
`

$3

`js
import { AsYouType } from 'libphonenumber-js'

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

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

$3

`js
import { findPhoneNumbersInText } from 'libphonenumber-js'

findPhoneNumbersInText(
For tech support call +7 (800) 555-35-35 internationally
or reach a local US branch at (213) 373-4253 ext. 1234.
, 'US')

// Outputs:
//
// [{
// number: PhoneNumber {
// country: 'RU',
// countryCallingCode: '7',
// number: '+78005553535',
// nationalNumber: '8005553535'
// },
// startsAt : 22,
// endsAt : 40
// }, {
// number: PhoneNumber {
// country: 'US',
// countryCallingCode: '1',
// number: '+12133734253',
// nationalNumber: '2133734253',
// ext: '1234'
// },
// startsAt : 86,
// endsAt : 110
// }]
`

"min" vs "max" vs "mobile" vs "core"

This library provides different "metadata" sets, "metadata" being a list of phone number parsing and formatting rules for all countries. The complete list of those rules is huge, so this library provides a way to optimize bundle size by choosing between max, min, mobile and "custom" metadata:

* max — The complete metadata set, is about 145 kilobytes in size (libphonenumber-js/metadata.max.json). Choose this when you need the most strict version of isValid(), or if you need to detect phone number type ("fixed line", "mobile", etc).

* min — (default) The smallest metadata set, is about 80 kilobytes in size (libphonenumber-js/metadata.min.json). Choose this by default: when you don't need to detect phone number type ("fixed line", "mobile", etc), or when a basic version of isValid() is enough. The min metadata set doesn't contain the regular expressions for phone number digits validation (via .isValid()) and detecting phone number type (via .getType()) for most countries. In this case, .isValid() still performs some basic phone number validation (for example, checks phone number length), but it doesn't validate phone number digits themselves the way max metadata validation does.

* mobile — The complete metadata set for dealing with mobile numbers _only_, is about 95 kilobytes in size (libphonenumber-js/metadata.mobile.json). Choose this when you need max metadata and when you _only_ accept mobile numbers. Other phone number types will still be parseable, but they won't be recognized as being "valid" (.isValid() will return false).

To use a particular metadata set, simply import functions from a relevant sub-package:

* libphonenumber-js/max
* libphonenumber-js/min
* libphonenumber-js/mobile

Importing functions directly from libphonenumber-js effectively results in using the min metadata.

Sometimes (rarely) not all countries are needed, and in those cases developers may want to generate their own "custom" metadata set. For those cases, there's libphonenumber-js/core sub-package which doesn't come pre-packaged with any default metadata set and instead accepts metadata as the last argument of each exported function.

Definitions

$3

A "country code" is a two-letter ISO country code (like US).

This library supports all officially assigned ISO alpha-2 country codes, plus a few extra ones like: AC (Ascension Island), TA (Tristan da Cunha), XK (Kosovo).

To check whether a country code is supported, use isSupportedCountry() function.

$3

There're several calling codes that don't belong to any country:

* +800 — Universal International Toll Free Number
* +808 — Universal International Shared Cost Number
* +870 — Inmarsat Global Limited
* +878 — Universal Personal Telecommunications
* +881 — Global Mobile Satellite System
* +882 and +883 — International Networks)
* +888 — United Nations Office for the Coordination of Humanitarian Affairs
* +979 — International Premium Rate Service

Such phone numbering plans are called "non-geographic", and their phone numbers have country set to undefined.

$3

"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.

$3

"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. Several countries can share the same "country calling code", e.g. NANPA countries like USA and Canada sharing the same 1 country calling code.

API

$3

Parses a phone number from string.

Can be imported both as a "default" export and as a "named" export parsePhoneNumberFromString.

`js
import parsePhoneNumber from 'libphonenumber-js'
// Or: import { parsePhoneNumberFromString as parsePhoneNumber } from 'libphonenumber-js'

const phoneNumber = parsePhoneNumber('(213) 373-42-53 ext. 1234', 'US')
if (phoneNumber) {
console.log(phoneNumber.formatNational())
}
`

Returns an instance of PhoneNumber class, or undefined if no phone number could be parsed: for example, when the string contains no phone number, or the phone number starts with a non-existent country calling code, etc.

Available options:

* defaultCountry: string — Default country for parsing numbers written in non-international form (without a + sign). Will be ignored when parsing numbers written in international form (with a + sign). Instead of passing it as options.defaultCountry, one could also pass it as a standalone defaultCountry argument (for convenience).

* defaultCallingCode: string — Default calling code for parsing numbers written in non-international form (without a + sign). Will be ignored when parsing numbers written in international form (with a + sign). It could be specified when parsing phone numbers belonging to "non-geographic numbering plans" which by nature don't have a country code, making the defaultCountry option unusable.

* extract: boolean — Defines the "strictness" of parsing a phone number. By default, the extract flag is true meaning that it will attempt to extract the phone number from an input string like "My phone number is (213) 373-4253 and my hair is blue". This could be thought of as "less strict" parsing. To make it "more strict", one could pass extract: false flag, in which case the function will attempt to parse the input string as if the whole string was a phone number. Applied to the example above, it would return undefined because the entire string is not a phone number, but for input string "(213) 373-4253" it would return a parsed PhoneNumber.

If a developer wants to know the exact reason why the phone number couldn't be parsed then they can use parsePhoneNumberWithError() function which throws the exact error:

`js
import { parsePhoneNumberWithError, ParseError } from 'libphonenumber-js'

try {
const phoneNumber = parsePhoneNumberWithError('(213) 373-42-53 ext. 1234', {
defaultCountry: 'US'
})
} catch (error) {
if (error instanceof ParseError) {
// Not a phone number, non-existent country, etc.
console.log(error.message)
} else {
throw error
}
}
`

#### Strictness

By default, the parsing function will attempt to extract a phone number from an input string even in cases like "Support: (213) 373-4253 (robot)", which mimicks the behavior of the original Google's libphonenumber library, and is the default behavior for legacy reasons. However, if "strict" input validation is required, one can pass extract: false flag to demand that the whole input string be a viable phone number.

`js
parsePhoneNumber('Call: (213) 373-4253', 'US') === PhoneNumber

// When parsing the same string with extract: false flag,
// it will return undefined, because a phone number can't
// contain letters or a colon.
parsePhoneNumber('Call: (213) 373-4253', {
defaultCountry: 'US',
extract: false
}) === undefined

parsePhoneNumber('(213) 373-4253', {
defaultCountry: 'US',
extract: false
}) === PhoneNumber
`

$3

PhoneNumber class instance has the following properties:

* number: string — The phone number in E.164 format. Example: "+12133734253".
* countryCallingCode: string — The country calling code. Example: "1".
* nationalNumber: string — The national (significant) number. Example: "2133734253".
* country: string? — The country code. Example: "US". Will be undefined when no country could be derived from the phone number. For example, when several countries have the same countryCallingCode and the nationalNumber doesn't look like it belongs to any of them. Or when a number belongs to a non-geographic numbering plan.
* ext: string? — The phone number extension), if any. Example: "1234".
* carrierCode: string? — The "carrier code", if any. Example: "15". "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.

PhoneNumber class instance provides the following methods:

#### setExt(ext: string)

Sets a phone number extension) of a phone number. Could be useful when formatting phone numbers stored as two separate fields: the phone number itself and the extension part.

`js
const phone = "+12133734253"
const phoneExt = "1234"

const phoneNumber = parsePhoneNumber(phone)
if (phoneNumber) {
if (phoneExt) {
phoneNumber.setExt(phoneExt)
}
// Returns "(213) 373-4253 ext. 1234"
return phoneNumber.formatNational()
}
`

#### format(format: string, [options]): string

Formats the phone number into a string according to a format.

Available formats:

* NATIONAL — Example: "(213) 373-4253"
* INTERNATIONAL — Example: "+1 213 373 4253"
* E.164 — Example: "+12133734253"
* RFC3966 (the phone number URI) — Example: "tel:+12133734253;ext=123"
* IDD — "Out-of-country" dialing format. Example: "011 7 800 555 35 35" 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.

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.

* nationalPrefix: Boolean — Some phone numbers can be formatted both with national prefix and without it. In such cases the library defaults to "with national prefix" (for legacy reasons). Pass nationalPrefix: false option to force formatting without national prefix in such cases.

Examples:

`js
import parsePhoneNumber from 'libphonenumber-js'

const phoneNumber = parsePhoneNumber('+12133734253')

phoneNumber.format("NATIONAL") === '(213) 373-4253'
phoneNumber.format("INTERNATIONAL") === '+1 213 373 4253'
phoneNumber.format("RFC3966") === 'tel:+12133734253'

// Aliases
phoneNumber.formatNational() === phoneNumber.format("NATIONAL")
phoneNumber.formatInternational() === phoneNumber.format("INTERNATIONAL")
phoneNumber.getURI() === phoneNumber.format("RFC3966")
`

#### isPossible(): boolean

Checks if the phone number is "possible". Only checks the phone number length, doesn't check the actual phone number digits against any regular expressions.

#### isValid(): boolean

Checks if the phone number is "valid". First checks the phone number length and then checks the phone number digits against all available regular expressions.

By default the library uses "minimal" metadata which is only 75 kilobytes in size but also doesn't include the precise validation regular expressions resulting in less strict validation rules (some very basic validation like length check is still included for each country). If you don't mind the extra 65 kilobytes of metadata then use "full" metadata instead (140 kilobytes). Google's library always uses "full" metadata so it will yield different isValidNumber() results compared to the "minimal" metadata used by default in this library.

####

See "Using phone number validation feature" for choosing between isPossible() and isValid().

#### getPossibleCountries(): string[]

Returns a list of countries this phone number could possibly belong to.

Can be used when parsing complete international phone numbers containing a "calling code" that is shared between several countries. If parsing such a phone number returns country: undefined then getPossibleCountries() function could be used to somehow speculate about what country could this phone number possibly belong to.

#### getType(): string?

Returns phone number type (fixed line, mobile, toll free, etc) or undefined (if the number is invalid or if there are no phone number type regular expressions for this country in metadata).

By default the library uses "minimal" metadata which is only 75 kilobytes in size but also doesn't include the regular expressions for determining a specific phone number type (fixed line, mobile, toll free, etc) resulting in getType() returning undefined for most countries. If you don't mind the extra 65 kilobytes of metadata then use "full" metadata instead (140 kilobytes). Google's library always uses "full" metadata so it will yield different getNumberType() results compared to the "minimal" metadata used by default in this library.

####

#### isNonGeographic(): boolean

Returns true if the number belongs to a "non-geographic numbering plan".

#### isEqual(phoneNumber: PhoneNumber): boolean

Compares two PhoneNumbers: returns true if they're equal, false otherwise.

$3

Checks if input can be parsed as a "possible" phone number. A phone number is "possible" when it has valid length. The actual phone number digits aren't validated.

`js
isPossiblePhoneNumber('8 (888) 888-88-88', 'RU') === true
isPossiblePhoneNumber('+12223333333') === true
`

For the description of the defaultCountry?: string | options?: object argument, see parsePhoneNumber() function description.

This function is just a shortcut for a two-step process of "strictly" parsing a phone number and then calling .isPossible().

$3

Checks if input can be parsed as a "valid" phone number. A phone number is "valid" when it has valid length, and the actual phone number digits match the regular expressions for its country.

`js
isValidPhoneNumber('8 (888) 888-88-88', 'RU') === false
isValidPhoneNumber('8 (800) 555-35-35', 'RU') === true
isValidPhoneNumber('+12223333333') === false
isValidPhoneNumber('+12133734253') === true
`

For the description of the defaultCountry?: string | options?: object argument, see parsePhoneNumber() function description.

This function is just a shortcut for a two-step process of "strictly" parsing a phone number and then calling .isValid().

See "Using phone number validation feature" for choosing between isPossible() and isValid().

$3

Same as isValidPhoneNumber() but with the "default country" argument being an "exact country" instead.

This function is not currently exported from this library. The reason is that its result would be too vague when false is returned — it could mean any of:

* The input is not a valid phone number.
* The input is a valid phone number but it belongs to another country.
* The input is a phone number that belongs to the correct country but is not valid.

At least the second case should be handled separately from a "User Experience" point of view: if the user has input a valid phone number but for another country, they should be notified that "the country is incorrect" rather than that "the phone number is incorrect", otherwise it would be bad UX design.

But for those who'd still like to have such function, here's a possible implementation for it:

`js
export default function isValidPhoneNumberForCountry(phoneNumberString, country) {
const phoneNumber = parsePhoneNumber(phoneNumberString, {
defaultCountry: country,
// Demand that the entire input string must be a phone number.
// Otherwise, it would "extract" a phone number from an input string.
extract: false
})
if (!phoneNumber) {
return false
}
if (phoneNumber.country !== country) {
return false
}
return phoneNumber.isValid()
}
`

The same approach could be used to implement an isPossiblePhoneNumberForCountry() function.

$3

Checks if input phone number length is valid. If it is, then nothing is returned. Otherwise, a rejection reason is returned.

######

`js
validatePhoneNumberLength('abcde') === 'NOT_A_NUMBER'
validatePhoneNumberLength('444 1 44') === 'INVALID_COUNTRY'
validatePhoneNumberLength('444 1 44', 'TR') === 'TOO_SHORT'
validatePhoneNumberLength('444 1 444', 'TR') === undefined // Length is valid.
validatePhoneNumberLength('444 1 4444', 'TR') === 'INVALID_LENGTH'
validatePhoneNumberLength('444 1 44444', 'TR') === 'INVALID_LENGTH'
validatePhoneNumberLength('444 1 444444', 'TR') === undefined // Length is valid.
validatePhoneNumberLength('444 1 4444444444', 'TR') === 'TOO_LONG'
`

For the description of the defaultCountry?: string | options?: object argument, see parsePhoneNumber() function description.

This function is just a more detailed version of isPossiblePhoneNumber() for those who've asked for a more specific rejection reason.

The phone number is parsed "strictly" from the input string.

$3

Creates a formatter for a partially entered phone number.

For the description of the defaultCountry?: string | options?: object argument, see parsePhoneNumber() function description.

The formatter instance has the following methods:

* input(text: string) — Appends text to the input. Returns the formatted phone number.

* reset() — Resets the input.

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

The formatter instance also provides the following getters:

* getNumber(): PhoneNumber? — Returns the PhoneNumber. Will return undefined if no national (significant) number digits have been entered so far, or if no defaultCountry/defaultCallingCode has been set and the user enters a phone number not in international format.

* getNumberValue(): string? — Returns the phone number in E.164 format. For example, for country "US" and input "(222) 333-4444" it will return "+12223334444". Will return undefined if no digits have been input, or when inputting a phone number in national format and no default country or default "country calling code" have been set.

* getChars(): string — Returns the phone number characters entered by the user: digits and a + sign (if present). Returns an empty string if no phone number characters have been input.

* getTemplate(): string — Returns the template used to format the phone number characters (digits and a + sign, if present), which are denoted by x-es. Returns an empty string if no phone number characters have been input.

`js
// National phone number input example.

const asYouType = new AsYouType('US')

asYouType.input('2') === '2'
asYouType.getNumber().number === '+12'
asYouType.getChars() === '2'
asYouType.getTemplate() === 'x'

asYouType.input('1') === '21'
asYouType.getNumber().number === '+121'
asYouType.getChars() === '21'
asYouType.getTemplate() === 'xx'

asYouType.input('3') === '(213)'
asYouType.getNumber().number === '+1213'
asYouType.getChars() === '213'
asYouType.getTemplate() === '(xxx)'

asYouType.input('3734253') === '(213) 373-4253'
asYouType.getNumber().number === '+12133734253'
asYouType.getChars() === '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.getNumber().country === 'US'
asYouType.getNumber().number === '+12133734253'
asYouType.getChars() === '+12133734253'
asYouType.getTemplate() === 'xx xxx xxx xxxx'
`

* isInternational(): boolean — Returns true if the phone number is being input in international format. In other words, returns true if and only if the parsed phone number starts with a "+".

* getCallingCode(): string? — Returns the "country calling code" part of the phone number. Returns undefined if the number is not being input in international format, or if no valid "country calling code" has been entered. Supports "non-geographic" phone numbering plans: even though those aren't technically "countries", they have their own "country calling codes" too.

* getCountry(): string? — Returns a two-letter country code of the phone number. Returns undefined for "non-geographic" phone numbering plans. Returns undefined if no phone number has been input yet.

* isPossible(): boolean — Returns true if the phone number is "possible". Is just a shortcut for PhoneNumber.isPossible().

* isValid(): boolean — Returns true if the phone number is "valid". Is just a shortcut for PhoneNumber.isValid().

####

"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.

$3

Searches for phone numbers in text.

Available options:

* defaultCountry: string
* defaultCallingCode: string

For the description of defaultCountry or defaultCallingCode, see parsePhoneNumber() function description.

`js
import { findPhoneNumbersInText } from 'libphonenumber-js'

findPhoneNumbersInText(
For tech support call +7 (800) 555-35-35 internationally
or reach a local US branch at (213) 373-4253 ext. 1234.
, 'US')

// Outputs:
//
// [{
// number: PhoneNumber {
// country: 'RU',
// countryCallingCode: '7',
// number: '+78005553535',
// nationalNumber: '8005553535'
// },
// startsAt : 22,
// endsAt : 40
// }, {
// number: PhoneNumber {
// country: 'US',
// countryCallingCode: '1',
// number: '+12133734253',
// nationalNumber: '2133734253',
// ext: '1234'
// },
// startsAt : 86,
// endsAt : 110
// }]
`

(in previous versions, it was called findNumbers())

####

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 "iterator" approach using searchPhoneNumbersInText() to perform the search asynchronously (e.g. using requestIdleCallback or requestAnimationFrame).

(in previous versions, it was called searchNumbers())

####

Although Google's javascript port doesn't have the findPhoneNumbersInText() 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 findPhoneNumbersInText() function provided is a port of Google's PhoneNumberMatcher.java into javascript.

$3

Returns an example phone number for a country. Returns an instance of PhoneNumber class. Will return undefined if country doesn't exist or isn't supported by this library.

`js
import examples from 'libphonenumber-js/mobile/examples'
import { getExampleNumber } from 'libphonenumber-js'

const phoneNumber = getExampleNumber('RU', examples)

phoneNumber.formatNational() === '8 (912) 345-67-89'
`

$3

Checks if a country is supported by this library.

`js
isSupportedCountry('RU') === true
isSupportedCountry('XX') === false
`

$3

Returns a list of supported countries.

`js
getCountries() === ["AC", "AD", ...]
`

$3

Returns country calling code for a country. Will throw an error if country doesn't exist or isn't supported by this library.

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

$3

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.

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

$3

Parses digits from string. Can be used for building a phone number extension input component (e.g. react-phone-number-input).

`js
parseDigits('x123') === '123'
parseDigits('٤٤٢٣') === '4423'
`

$3

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

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

$3

Parses next character of an input string while parsing phone number digits (including a +) from that string. Basically, it discards everything except + and digits, and + is only allowed at the start of a phone number.

This function is a low-level one that is currently only used in react-phone-number-input with input-format. Frankly speaking, that's the only reason why this function is exported. Other developers should just ignore it and use parseIncompletePhoneNumber() instead because it's much simpler.

`js
// Suppose a user inputs a "+1 (213) 373-42-53" string
// and it starts parsing that string character-by-character.

parsePhoneNumberCharacter('+', undefined) === '+'
parsePhoneNumberCharacter('1', '+') === '1'
parsePhoneNumberCharacter(' ', '+1') === undefined
parsePhoneNumberCharacter('(', '+1') === undefined
parsePhoneNumberCharacter('2', '+1') === '2'
parsePhoneNumberCharacter('1', '+12') === '1'
parsePhoneNumberCharacter('3', '+121') === '3'
parsePhoneNumberCharacter(')', '+1213') === undefined
parsePhoneNumberCharacter(' ', '+1213') === undefined
parsePhoneNumberCharacter('3', '+1213') === '3'
parsePhoneNumberCharacter('7', '+12133') === '7'
parsePhoneNumberCharacter('3', '+121337') === '3'
parsePhoneNumberCharacter('-', '+121337') === undefined
parsePhoneNumberCharacter('4', '+1213373') === '4'
parsePhoneNumberCharacter('2', '+12133734') === '2'
parsePhoneNumberCharacter('-', '+12133734') === undefined
parsePhoneNumberCharacter('5', '+121337342') === '5'
parsePhoneNumberCharacter('3', '+1213373425') === '3'
`

So basically, it's the same as parseIncompletePhoneNumber() with the only difference that it operates at a character-by-character level rather than at a string-as-a-whole level.

The optional emitEvent argument is a function of (eventName: string) arguments. It will be called in a situation when the application should stop parsing the input string. Currently, the only situation when that could happen is when it encounters an "out-of-place" + character. For example, when parsing a "+1 (234) + 56-78" string it would emit an "end" event at the second + character so that the application would return "+1234" rather than "+12345678".

$3

Formats a possibly incomplete phone number.

While the usual parsePhoneNumber(string).format() function could only be used to format a complete phone number, this function could be used to format a possibly incomplete phone number.

The value argument should be a (possibly incomplete) phone number in E.164 format.

For the description of the defaultCountry?: string | options?: object argument, see parsePhoneNumber() function description.

This function is just an alias for new AsYouType(defaultCountry, metadata).input(value). It can be used for building a phone number input component (e.g. react-phone-number-input).

`js
// National numbers, with second argument.
formatIncompletePhoneNumber('8800555', 'RU') === '8 (800) 555'
formatIncompletePhoneNumber('8800555', { defaultCountry: 'RU' }) === '8 (800) 555'
formatIncompletePhoneNumber('8800555', { defaultCallingCode: '7' }) === '8 (800) 555'

// International numbers, without second argument.
formatIncompletePhoneNumber('+7800555') === '+7 800 555'
`

Legacy API