libphonenumbers v1.3.0
libphonenumbers
libphonenumbers is JS port of Google's libphonenumber.
libphonenumbers – JavaScript port of Google's libphonenumber library for parsing, formatting, and validating international phone numbers in Node.js.
🎁 Features
libphonenumbers is compatible with both JavaScript and TypeScript.
PhoneNumberUtil
- format(number, numberFormat) is used to formats a phone number in the specified format using default rules.
- formatInOriginalFormat(number, regionCallingFrom) is used to formats a phone number using the original phone number format that the number is parsed from.
- formatOutOfCountryCallingNumber(number, regionCallingFrom) is used to formats a phone number for out-of-country dialing purposes.
- getNumberType(number) is used to gets the type of a valid phone number.
- getRegionCodeForNumber(number) is used to gets the region where a phone number is from.
- isPossibleNumber(number) is used to checks whether a phone number is possible.
- isValidNumber(number) is used to checks whether a phone number matches a valid pattern.
- isValidNumberForRegion(number, regionCode) is used to checks whether a phone number is valid for a certain region.
- parseAndKeepRawInput(numberToParse, defaultRegion) is used to parses a string and returns it in prototype buffer format while keeping the raw input value.
- parse(numberToParse, defaultRegion) is used to parses a string and returns it in proto buffer format.
AsYouTypeFormatter
- inputDigit(digit) is used to formats a phone number on-the-fly as each digit is entered.
- clear() is used to clears the internal state of the formatter, so it can be reused.
PhoneNumberFormat ( The following enums is used to pass to format(number, numberFormat) )
- E164 (value is 0)
- INTERNATIONAL (value is 1)
- NATIONAL (value is 2)
- RFC3966 (value is 3)
PhoneNumberType ( The following enums is used to compare with the output of getNumberType(number) )
- FIXED_LINE (value is 0)
- MOBILE (value is 1)
- FIXED_LINE_OR_MOBILE (value is 2)
- TOLL_FREE (value is 3)
- PREMIUM_RATE (value is 4)
- SHARED_COST (value is 5)
- VOIP (value is 6)
- PERSONAL_NUMBER (value is 7)
- PAGER (value is 8)
- UAN (value is 9)
- VOICEMAIL (value is 10)
- UNKNOWN (value is -1)
PhoneNumber
- getCountryCode() is used to gets the value of the country code.
- getCountryCodeSource() is used to gets the value of the country code source.
- getExtension() is used to gets the value of the extension.
- getItalianLeadingZero() is used to gets the value of the italian leading zero.
- getNationalNumber() is used to gets the value of the national number.
- getRawInput() is used to gets the value of the raw input.
CountryCodeSource ( The following enums is used to compare with the output of getCountryCodeSource() )
- UNSPECIFIED (value is 0)
- FROM_NUMBER_WITH_PLUS_SIGN (value is 1)
- FROM_NUMBER_WITH_IDD (value is 5)
- FROM_NUMBER_WITHOUT_PLUS_SIGN (value is 10)
- FROM_DEFAULT_COUNTRY (value is 20)
ShortNumberInfo
- connectsToEmergencyNumber(number, regionCode) is used to checks whether the short number can be used to connect to emergency services when dialed from the given region.
- isPossibleShortNumber(number) is used to checks whether a short number is a possible number.
- isPossibleShortNumberForRegion(number, regionDialingFrom) is used to checks whether a short number is a possible number when dialed from the given region.
- isValidShortNumber(number) is used to checks whether a short number is a valid number.
- isValidShortNumberForRegion(number, regionDialingFrom) is used to checks whether a short number matches a valid pattern in a region.
❌ Missing Features:
JS port of Google's libphonenumber does not support the following functions and classes:
- findNumbers
- PhoneNumberOfflineGeocoder
- PhoneNumberToTimeZonesMapper
- PhoneNumberToCarrierMapper
🔧 Install
libphonenumbers is available on npm. It can be installed with the following command:
npm install libphonenumbers --save
libphonenumbers is available on yarn as well. It can be installed with the following command:
yarn add libphonenumbers
💡 Usage
🎀 PhoneNumberUtil
📦 format(number, numberFormat)
Using Standard JavaScript:
const PNF = require('libphonenumbers').PhoneNumberFormat;
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Format number in the RFC3966 format
console.log(phoneUtil.format(number, PNF.RFC3966));
// tel:+1-202-456-2121
// Format number in the national format
console.log(phoneUtil.format(number, PNF.NATIONAL));
// (202) 456-2121
// Format number in the international format
console.log(phoneUtil.format(number, PNF.INTERNATIONAL));
// +1 202-456-2121
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
const PNF = libphonenumbers.PhoneNumberFormat;
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Format number in the RFC3966 format
console.log(phoneUtil.format(number, PNF.RFC3966));
// tel:+1-202-456-2121
// Format number in the national format
console.log(phoneUtil.format(number, PNF.NATIONAL));
// (202) 456-2121
// Format number in the international format
console.log(phoneUtil.format(number, PNF.INTERNATIONAL));
// +1 202-456-2121
📦 formatInOriginalFormat(number, regionCallingFrom)
Using Standard JavaScript:
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Format number in the original format
console.log(phoneUtil.formatInOriginalFormat(number, 'US'));
// => (202) 456-2121
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Format number in the original format
console.log(phoneUtil.formatInOriginalFormat(number, 'US'));
// (202) 456-2121
📦 formatOutOfCountryCallingNumber(number, regionCallingFrom)
Using Standard JavaScript:
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Format number in the out-of-country format from US
console.log(phoneUtil.formatOutOfCountryCallingNumber(number, 'US'));
// 1 (202) 456-2121
// Format number in the out-of-country format from JP
console.log(phoneUtil.formatOutOfCountryCallingNumber(number, 'JP'));
// 010 1 202-456-2121
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Format number in the out-of-country format from US
console.log(phoneUtil.formatOutOfCountryCallingNumber(number, 'US'));
// 1 (202) 456-2121
// Format number in the out-of-country format from JP
console.log(phoneUtil.formatOutOfCountryCallingNumber(number, 'JP'));
// 010 1 202-456-2121
📦 getNumberType(number)
Using Standard JavaScript:
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Get type of phone number
console.log(phoneUtil.getNumberType(number));
// 2 // FIXED_LINE_OR_MOBILE
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Get type of phone number
console.log(phoneUtil.getNumberType(number));
// 2 // FIXED_LINE_OR_MOBILE
📦 getRegionCodeForNumber(number)
Using Standard JavaScript:
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Get region code of number
console.log(phoneUtil.getRegionCodeForNumber(number));
// US
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Get region code of number
console.log(phoneUtil.getRegionCodeForNumber(number));
// US
📦 isPossibleNumber(number)
Using Standard JavaScript:
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Check is possible number
console.log(phoneUtil.isPossibleNumber(number));
// true
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Check is possible number
console.log(phoneUtil.isPossibleNumber(number));
// true
📦 isValidNumber(number)
Using Standard JavaScript:
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Get is valid number
console.log(phoneUtil.isValidNumber(number));
// true
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Get is valid number
console.log(phoneUtil.isValidNumber(number));
// true
📦 isValidNumberForRegion(number, regionCode)
Using Standard JavaScript:
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Check number of a region is valid
console.log(phoneUtil.isValidNumberForRegion(number, 'US'));
// true
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Check number of a region is valid
console.log(phoneUtil.isValidNumberForRegion(number, 'US'));
// true
📦 parseAndKeepRawInput(numberToParse, defaultRegion)
Using Standard JavaScript:
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
📦 parse(numberToParse, defaultRegion)
Using Standard JavaScript:
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Get prototype buffer format
console.log(phoneUtil.parse('123456', 'US'));
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Get proto buffer format
console.log(phoneUtil.parse('123456', 'US'));
🎀 AsYouTypeFormatter
📦 inputDigit(digit)
Using Standard JavaScript:
const AsYouTypeFormatter = require('libphonenumbers').AsYouTypeFormatter;
// Create an instance object of AsYouTypeFormatter
const formatter = new AsYouTypeFormatter('US');
console.log(formatter.inputDigit('2')); // => 2
console.log(formatter.inputDigit('0')); // => 20
console.log(formatter.inputDigit('2')); // => 202
console.log(formatter.inputDigit('-')); // => 202-
console.log(formatter.inputDigit('4')); // => 202-4
console.log(formatter.inputDigit('5')); // => 202-45
console.log(formatter.inputDigit('6')); // => 202-456
console.log(formatter.inputDigit('-')); // => 202-456-
console.log(formatter.inputDigit('2')); // => 202-456-2
console.log(formatter.inputDigit('1')); // => 202-456-21
console.log(formatter.inputDigit('2')); // => 202-456-212
console.log(formatter.inputDigit('1')); // => 202-456-2121
// Clear all input digits from instance
formatter.clear();
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
const AsYouTypeFormatter = libphonenumbers.AsYouTypeFormatter;
// Create an instance object of AsYouTypeFormatter
const formatter = new AsYouTypeFormatter('US');
console.log(formatter.inputDigit('2')); // 2
console.log(formatter.inputDigit('0')); // 20
console.log(formatter.inputDigit('2')); // 202
console.log(formatter.inputDigit('-')); // 202-
console.log(formatter.inputDigit('4')); // 202-4
console.log(formatter.inputDigit('5')); // 202-45
console.log(formatter.inputDigit('6')); // 202-456
console.log(formatter.inputDigit('-')); // 202-456-
console.log(formatter.inputDigit('2')); // 202-456-2
console.log(formatter.inputDigit('1')); // 202-456-21
console.log(formatter.inputDigit('2')); // 202-456-212
console.log(formatter.inputDigit('1')); // 202-456-2121
// Clear all input digits from instance
formatter.clear();
🎀 PhoneNumber
📦 getCountryCode()
Using Standard JavaScript:
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Get the phone's country code
console.log(number.getCountryCode());
// 1
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Get the phone's country code
console.log(number.getCountryCode());
// 1
📦 getCountryCodeSource()
Using Standard JavaScript:
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Get the phone's extension
console.log(number.getCountryCodeSource());
// FROM_DEFAULT_COUNTRY
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Print the phone's extension
console.log(number.getCountryCodeSource());
// FROM_DEFAULT_COUNTRY
📦 getExtension()
Using Standard JavaScript:
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Print the phone's extension
console.log(number.getExtension());
// null
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Print the phone's extension
console.log(number.getExtension());
// => null
📦 getItalianLeadingZero()
Using Standard JavaScript:
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Get phone's italian leading zero
console.log(number.getItalianLeadingZero());
// null
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Get phone's italian leading zero
console.log(number.getItalianLeadingZero());
// null
📦 getNationalNumber()
Using Standard JavaScript:
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Get the phone's national number
console.log(number.getNationalNumber());
// 2024562121
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Get the phone's national number
console.log(number.getNationalNumber());
// 2024562121
📦 getRawInput()
Using Standard JavaScript:
// Create an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Get the phone's raw input
console.log(number.getRawInput());
// 202-456-2121
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Get the phone's raw input
console.log(number.getRawInput());
// 202-456-2121
🎀 ShortNumberInfo
📦 connectsToEmergencyNumber(number, regionCode)
Using Standard JavaScript:
// Get an instance of ShortNumberInfo
const shortInfo = require('libphonenumbers').ShortNumberInfo.getInstance();
// Check 911 is emergency number in US
console.log(shortInfo.connectsToEmergencyNumber('911', 'US'));
// true
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Get an instance of ShortNumberInfo
const shortInfo = libphonenumbers.ShortNumberInfo.getInstance();
// Check 911 is emergency number in US
console.log(shortInfo.connectsToEmergencyNumber('911', 'US'));
// true
📦 isPossibleShortNumber(number)
Using Standard JavaScript:
// Get an instance of ShortNumberInfo
const shortInfo = require('libphonenumbers').ShortNumberInfo.getInstance();
// Get an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Check 123456 is possible short number in FR
console.log(shortInfo.isPossibleShortNumber(phoneUtil.parse('123456', 'FR')));
// true
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Get an instance of ShortNumberInfo
const shortInfo = libphonenumbers.ShortNumberInfo.getInstance();
// Get an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Check 123456 is possible short number in FR
console.log(shortInfo.isPossibleShortNumber(phoneUtil.parse('123456', 'FR')));
// true
📦 isPossibleShortNumberForRegion(number, regionDialingFrom)
Using Standard JavaScript:
// Get an instance of ShortNumberInfo
const shortInfo = require('libphonenumbers').ShortNumberInfo.getInstance();
// Get an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Check 123456 is possible short number for region in FR
console.log(shortInfo.isPossibleShortNumberForRegion(phoneUtil.parse('123456', 'FR'), 'FR'));
// true
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Get an instance of ShortNumberInfo
const shortInfo = libphonenumbers.ShortNumberInfo.getInstance();
// Get an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Check 123456 is possible short number for region in FR
console.log(shortInfo.isPossibleShortNumberForRegion(phoneUtil.parse('123456', 'FR'), 'FR'));
// true
📦 isValidShortNumber(number)
Using Standard JavaScript:
// Get an instance of ShortNumberInfo
const shortInfo = require('libphonenumbers').ShortNumberInfo.getInstance();
// Get an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Check 202-456-2121 is valid short number
console.log(shortInfo.isValidShortNumber(number));
// false
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Get an instance of ShortNumberInfo
const shortInfo = libphonenumbers.ShortNumberInfo.getInstance();
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Check 202-456-2121 is valid short number
console.log(shortInfo.isValidShortNumber(number));
// false
📦 isValidShortNumberForRegion(number, regionDialingFrom)
Using Standard JavaScript:
// Get an instance of ShortNumberInfo
const shortInfo = require('libphonenumbers').ShortNumberInfo.getInstance();
// Get an instance of PhoneNumberUtil
const phoneUtil = require('libphonenumbers').PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Check 202-456-2121 is valid short number for US region
console.log(shortInfo.isValidShortNumberForRegion(number, 'US'));
// false
Using ECMAScript (ES):
import libphonenumbers from 'libphonenumbers';
// Get an instance of ShortNumberInfo
const shortInfo = libphonenumbers.ShortNumberInfo.getInstance();
// Create an instance of PhoneNumberUtil
const phoneUtil = libphonenumbers.PhoneNumberUtil.getInstance();
// Parse number with US country code and keep raw input
const number = phoneUtil.parseAndKeepRawInput('202-456-2121', 'US');
// Check 202-456-2121 is valid short number for US region
console.log(shortInfo.isValidShortNumberForRegion(number, 'US'));
// false
🦄 Credits and Inspiration
Inspired by Google's libphonenumber.