libphonenumber-js review
A focused open-source choice for validating phone numbers in web forms.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
libphonenumber-js is an open-source JavaScript/TypeScript library for developers building web forms and other web experiences that handle personal phone numbers. It provides functions to parse complete numbers, check possible and valid numbers, validate length and digits, and format numbers nationally or internationally. It can also find complete phone numbers in text, format input as users type, and provide TypeScript definitions. The package is distributed through npm and can also be included directly in web pages.
Its strongest fit is developer-controlled form validation. As-you-type formatting can help structure input while a user enters a number, while selectable or custom metadata sets give teams control over the information included in the package. With maximum metadata, the library can detect phone-number types. This makes it suitable for web applications that need local parsing, formatting, and validation logic without adopting a hosted service. The open-source model also keeps the core library available without a paid tier.
The scope is deliberately narrower than a full phone-validation platform. libphonenumber-js does not provide live carrier lookup, carrier data, bulk-upload workflows, or paid plans. It is also focused on web use rather than broader platform coverage. Choose it when your team wants an open-source JavaScript/TypeScript library for client-side or application-level phone-number handling and can manage the surrounding application workflow. Consider another option when you need carrier verification, bulk validation, or a hosted service with broader operational features.
libphonenumber-js pros and cons
- Where it wins
- Parses, formats, and validates complete phone numbers
- Formats numbers as users type and detects phone-number types
- Supports selectable or custom metadata sets and TypeScript definitions
- Where it doesn't
- No live carrier lookup or carrier data
- No bulk validation workflows or paid plans
- Web-focused library rather than a hosted validation service
libphonenumber-js fact sheet, pricing and score →
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