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

$ 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 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'
}

Validate phone number

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.

Format phone number

import parsePhoneNumber from 'libphonenumber-js'

const phoneNumber = parsePhoneNumber('+12133734253')

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

"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 { 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

Country code

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.

Non-geographic

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.

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. 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

parsePhoneNumber(string, defaultCountry?: string | options?: object): PhoneNumber

Parses a phone number from string.

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

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:

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.

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

PhoneNumber

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.

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:

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.

import parseMin from 'libphonenumber-js/min'
import parseMax from 'libphonenumber-js/max'
import parseMobile from 'libphonenumber-js/mobile'

// Mobile numbers in Singapore starting from `8`
// can only have the second digit in the range of `0..8`.
// Here the second digit is `9` which makes it an invalid mobile number.
// This is a "strict" (advanced) validation rule and is
// not included in the (default) "min" bundle.

// The basic number length check passes (`8..11`) and the
// "loose" national number validation regexp check passes too:
// `(?:1\d{3}|[369]|7000|8(?:\d{2})?)\d{7}`.
parseMin('+6589555555').isValid() === true

// The "advanced" validation regexp for mobile numbers is
// `(?:8[1-8]|9[0-8])\\d{6}` and possible lengths are `8`.
parseMax('+6589555555').isValid() === false
parseMobile('+6589555555').isValid() === false

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.

import parseMin from 'libphonenumber-js/min'
import parseMax from 'libphonenumber-js/max'
import parseMobile from 'libphonenumber-js/mobile'

// Singapore valid mobile number.

// The (default) "min" bundle doesn't contain any regexps for
// getting phone number type based on national number (for Singapore).
parseMin('+6584655555').getType() === undefined

// The "max" bundle contains regexps for
// getting phone number type based on national number
// for all possible phone number types.
parseMax('+6584655555').getType() === 'MOBILE'

// The "mobile" bundle contains regexps for
// getting phone number type based on national number
// for mobile phone numbers only.
parseMobile('+6584655555').getType() === 'MOBILE'

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.

isPossiblePhoneNumber(input: string, defaultCountry?: string | options?: object): boolean

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.

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().

isValidPhoneNumber(input: string, defaultCountry?: string | options?: object): boolean

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.

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().

isValidPhoneNumberForCountry(input: string, country: string): boolean

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:

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.

validatePhoneNumberLength(input: string, defaultCountry?: string | options?: object): string?

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

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.

class AsYouType(defaultCountry?: string | options?: object)

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.

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.

// 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().

// National phone number input example.

const asYouType = new AsYouType('US')

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

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

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

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

// 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'

"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.

findPhoneNumbersInText(text: string, defaultCountry?: string | options?: object): object[]

Searches for phone numbers in text.

Available options:

• defaultCountry: string
• defaultCallingCode: string

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

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())

import { findNumbers } from 'libphonenumber-js'

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

// Outputs:
//
// [{
//   phone    : '8005553535',
//   country  : 'RU',
//   startsAt : 22,
//   endsAt   : 40
// },
// {
//   phone    : '2133734253',
//   country  : 'US',
//   ext      : '1234',
//   startsAt : 86,
//   endsAt   : 110
// }]

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())

import { searchPhoneNumbersInText } from 'libphonenumber-js'

const text = `
  For tech support call +7 (800) 555-35-35 internationally
  or reach a local US branch at (213) 373-4253 ext. 1234.
`

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

import { PhoneNumberMatcher } from 'libphonenumber-js'

const matcher = new PhoneNumberMatcher(`
  For tech support call +7 (800) 555-35-35 internationally
  or reach a local US branch at (213) 373-4253 ext. 1234.
`, {
  defaultCountry: 'US',
  v2: true
})

// 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 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.

getExampleNumber(country: string, examples: object): PhoneNumber

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.

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

const phoneNumber = getExampleNumber('RU', examples)

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

isSupportedCountry(country: string): boolean

Checks if a country is supported by this library.

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

getCountries(): string[]

Returns a list of supported countries.

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

getCountryCallingCode(country: string): string

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

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

getExtPrefix(country: string): string

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'

parseDigits(text: string): string

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

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

parseIncompletePhoneNumber(text: string): string

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'

parsePhoneNumberCharacter(nextCharacter, prevParsedCharacters, emitEvent?)

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.

// 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".

formatIncompletePhoneNumber(value: string, defaultCountry?: string | options?: object): string

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).

// 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

// 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' }

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

// 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 }) === {}

// 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' }

// 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

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

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

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

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

// 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 don't use strict phone number validation in my projects. The rationale is that telephone numbering plans can and sometimes do change, meaning that PhoneNumber.isValid() function may one day become outdated on a website that isn't actively maintained anymore. Imagine a "promo-site" or a "personal website" being deployed once and then running for years without any maintenance, where a client may be unable to submit a simple "Contact Us" form just because this newly allocated pool of mobile phone numbers wasn't present in that old version of libphonenumber-js bundled in it.

Whenever there's a "business requirement" to validate a phone number that's being input by a user, I prefer using PhoneNumber.isPossible() instead of PhoneNumber.isValid(), so that it just validates the phone number length, and doesn't validate the actual phone number digits. But it doesn't mean that you shouldn't use PhoneNumber.isValid() — maybe in your case it would make sense.

React

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

Bug reporting

This library is a simpler rewrite of Google's libphonenumber library. Basically, it mimicks Google's library behavior. Hence, as long as this library's demo page and Google's library demo page exhibit the same behavior, it's not considered a bug.

When reporting issues with:

• Parsing
• Validation
• Formatting
• "As You Type" formatting

one must provide two links:

• A link to the demo page illustrating the supposedly incorrect behavior.
• A link to Google's libphonenumber demo page illustrating the expected behavior.

Google's demo page outputs four sections:

• "Parsing Result"
• "Validation Results"
• "Formatting Results"
• "AsYouTypeFormatter Results"

Choose the relevant section of those four corresponding to the type of the bug you're reporting.

In a bug report:

• First, describe the observed libphonenumber-js demo result (and provide a link to it).
• Second, describe the observed Google's demo result (and provide a link to it).
• The described observed result of Google's demo must be different from the described observed result of libphonenumber-js demo, otherwise it's not considered a bug. If you don't agree with Google's demo result then create an issue in Google's repo instead. If they fix it in their library, I'll port the fix to this library.

TypeScript

This library comes with TypeScript "typings". If you happen to find any bugs in those, create an issue.

CDN

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

<script src="https://unpkg.com/libphonenumber-js@[version]/bundle/libphonenumber-[type].js"></script>

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

where [version] is an npm package version range (for example, 1.x or ^1.7.6) and [type] is the bundle type: min, max or mobile.

Metadata

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

Programmatic access

Metadata can be accessed programmatically by using the exported Metadata class.

First, create a Metadata class instance:

import { Metadata } from 'libphonenumber-js'

const metadata = new Metadata()

Then, select a "numbering plan" (a country):

metadata.selectNumberingPlan('US')

After that, the following methods of metadata.numberingPlan can be called:

• leadingDigits(): string? — Returns "leading digits" pattern.

• possibleLengths(): number[] — Returns a list of possible lengths of a national (significant) number.

• IDDPrefix(): string — Returns an International Direct Dialing prefix.

• defaultIDDPrefix(): string? — Returns a default International Direct Dialing prefix when there're multiple ones available.

Example:

import { Metadata } from 'libphonenumber-js'

const metadata = new Metadata()
metadata.selectNumberingPlan('US')

metadata.numberingPlan.leadingDigits() === undefined
metadata.numberingPlan.possibleLengths() === [10]
metadata.numberingPlan.IDDPrefix() === '011'
metadata.numberingPlan.defaultIDDPrefix() === undefined

Using with custom metadata:

import { Metadata } from 'libphonenumber-js/core'

import min from 'libphonenumber-js/min/metadata'
// import max from 'libphonenumber-js/max/metadata'
// import mobile from 'libphonenumber-js/mobile/metadata'

const metadata = new Metadata(min)

As one can see, the Metadata class is not documented much. Partially, that's because its usage is not necessarily encouraged, but it's still used, for example, in react-phone-number-input to get "leading digits" for a country, or to get maximum phone number length for a country. Stick to the methods documented above, don't call any other methods. If you think there's a need to call any other methods, create a discussion issue.

Customizing metadata

This library comes prepackaged with three types of metadata.

Sometimes, 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 validating phone number digits and detecting phone number type), then they can generate such custom metadata and pass it as the last argument to this library's "core" functions.

See generate custom metadata instructions.

import _parsePhoneNumber, {
  findPhoneNumbersInText as _findPhoneNumbersInText,
  AsYouType as _AsYouType
} from 'libphonenumber-js/core'

import metadata from 'libphonenumber-js/max/metadata'

function call(func, _arguments) {
  var args = Array.prototype.slice.call(_arguments)
  args.push(metadata)
  return func.apply(this, args)
}

export default function parsePhoneNumber() {
  return call(_parsePhoneNumber, arguments)
}

export function findPhoneNumbersInText() {
  return call(_findPhoneNumbersInText, arguments)
}

export function AsYouType(country) {
  return _AsYouType.call(this, country, metadata)
}
AsYouType.prototype = Object.create(_AsYouType.prototype, {})
AsYouType.prototype.constructor = AsYouType

var core = require('libphonenumber-js/core')
var metadata = require('libphonenumber-js/max/metadata')

function call(func, _arguments) {
  var args = Array.prototype.slice.call(_arguments)
  args.push(metadata)
  return func.apply(this, args)
}

function parsePhoneNumber() {
  return call(core.default, arguments)
}

exports = module.exports = parsePhoneNumber
exports['default'] = parsePhoneNumber

exports.findPhoneNumbersInText = function findPhoneNumbersInText() {
  return call(core.findPhoneNumbersInText, arguments)
}

exports.AsYouType = function AsYouType(country) {
  return core.AsYouType.call(this, country, metadata)
}
exports.AsYouType.prototype = Object.create(core.AsYouType.prototype, {})
exports.AsYouType.prototype.constructor = exports.AsYouType

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

import metadata from 'libphonenumber-js/max/metadata'

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

var custom = require('libphonenumber-js/custom')
var metadata = require('libphonenumber-js/max/metadata')

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.

Metadata update process is automated through an "autoupdate" script: see autoupdate.cmd (Windows) or autoupdate.sh (Linux/macOS). 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.

Also Google sometimes (very rarely) updates their code:

• phonenumberutil.js — parseNumber(), formatNumber(), isValidNumber(), getNumberType()
• AsYouTypeFormatter.java — AsYouType
• PhoneNumberMatcher.java — findPhoneNumbersInText()

The latest sync-up was on Aug 14th, 2024.

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

Test coverage must remain at 100%:

npm run test-coverage

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

Tests

This component comes with a 100% code coverage.

To run tests:

npm test

To generate a code coverage report:

npm run test-coverage

The code coverage report can be viewed by opening ./coverage/lcov-report/index.html.

Advertisement

If you like this library then you might also like:

• react-phone-number-input — A React component for phone number input.
• javascript-time-ago — An international human-readable past or future date formatter. Example: "2 days ago".
• react-time-ago — A React component for international human-readable formatting of past or future dates. Example: "2 days ago".
• read-excel-file — A simple and easy-to-use *.xlsx file reader (client-side or server-side).
• write-excel-file — A simple and easy-to-use *.xlsx file writer (client-side or server-side).
• flexible-json-schema — A simple and easy-to-use *.json schema data validator / parser.
• virtual-scroller — A universal implementation of a "virtual scroller" infinite list scrolling component: only renders the rows that fit the screen bounds.

License

Google's libphonenumber is licensed under Apache 2.

Apache 2 does not require a derivative work of the software, or modifications to the original, to be distributed using the same license. Hence, this library is licensed under MIT, which is compatible with Apache 2.

The Apache license is terminated if the user sues anyone over patent infringement related to the software covered by the license. This condition is added in order to prevent patent litigations.