Developers
How to check if a phone number is on WhatsApp with an API
How a WhatsApp registration check works, what registered, not registered and unknown mean, and how to call it responsibly from cURL, Node and Python.
8 min read
Articles tagged “API”
8 articles.
Developers
E.164 phone number format: a practical guide for developers
How to normalize phone numbers to E.164 in JavaScript and Python, the pitfalls that break deduplication, and how the MobileValidate API normalizes input.
8 min read
Fraud prevention
OTP fraud prevention: the checks to run before you send a code
A practical pre-send pipeline for one-time passcodes: normalize, check line type, messenger presence and reputation in one request, then decide.
8 min read
Guides
How to evaluate a phone number validation API: a buyer's checklist
The criteria that matter when you choose a phone-intelligence API: coverage, conclusive rates, unknown billing, latency, freshness, privacy and test mode.
9 min read
Developers
Phone number validation in JavaScript and Node.js
Validate phone numbers in JavaScript with libphonenumber-js: min vs max metadata, E.164, form input, and a live line-type check with runnable Node code.
8 min read
Developers
Phone number validation in PHP and Laravel
Validate phone numbers in PHP with libphonenumber-for-php, write a Laravel rule, and add a live line-type check with Guzzle that never breaks the form.
7 min read
Developers
Phone number validation in Python: phonenumbers, Pydantic and a live check
Validate phone numbers in Python with the phonenumbers library: is_valid vs is_possible, E.164, a Pydantic validator, pytest and a live check with httpx.
7 min read
Guides
Telegram number check: a practical guide to what it can and can't tell you
How Telegram's phone and username model differs, what a registration check can and can't tell you, how privacy settings affect it, with API examples.
7 min read
