Question 1

How do I validate phone numbers in JavaScript with libphonenumber?

Accepted Answer

Include the library via npm or CDN, then use PhoneNumberUtil.parse() and isValidNumber() methods. For dynamic formatting, instantiate AsYouTypeFormatter with the country code.

Question 2

libphonenumber vs phonenumbers for Python – which should I use?

Accepted Answer

libphonenumber is Google's original multi-language library, but for Python, the phonenumbers port is more native and maintained separately. Check if it has all features you need, as ports may lag behind updates.

Question 3

Does libphonenumber work offline for geocoding?

Accepted Answer

Yes, PhoneNumberOfflineGeocoder provides geographical descriptions without internet, but you must bundle the metadata with your app, which can increase size.

Question 4

How to extract phone numbers from text using libphonenumber?

Accepted Answer

Use the findNumbers function to scan and extract phone numbers from strings or documents. It supports multiple regions and formats, as highlighted in the README's functionality list.

Question 5

What's the best way to reduce libphonenumber size in a web app?

Accepted Answer

Consider using alternative ports like libphonenumber-js, which is a stripped-down version at 110 KB, or implement code splitting to load only necessary country metadata.

Question 6

Can libphonenumber handle phone number portability?

Accepted Answer

No, it only identifies the original carrier assigned to a number range, not the current carrier after porting. This is a known limitation mentioned in the library's documentation.

libphonenumber

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