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Validating Phone Numbers in JavaScript: Regex vs API
Phone number validation in JavaScript works best in two layers. In the browser, a permissive regex on an input of type "tel" catches typos instantly. On your server, a validation API confirms the number is real and returns its country, carrier and line type. Regex...
E.164 Format: How to Normalize International Phone Numbers With an API
One customer can enter their phone number three ways: (415) 858-6273, 415.858.6273, and +1 415 858 6273. Without normalization, those entries can become duplicate CRM records, duplicate OTP attempts, and unnecessary support issues. The E.164 format solves the...
Bulk Phone Verification: Cleaning a 50,000 Number List the Right Way
A bulk phone number lookup cleans a large list in five steps: normalize every number to E.164, remove duplicates and obvious junk, validate the remaining numbers through an API in rate-limited batches, segment the results by validity and line type, and re-validate on...
Mobile or Landline? How to Tell What Type of Number You Have
To tell whether a number is mobile or landline, run it through a line type lookup. In the US and many other countries, mobile and landline numbers share the same area codes, and number porting lets people move a number between line types, so the digits alone cannot...
HLR Lookup Explained: How Carriers Confirm a Number Is Live
An HLR lookup is a real-time query to a mobile operator's Home Location Register, the database that tracks every subscriber on its network. It tells you whether a mobile number is currently active, which network it belongs to right now (even after porting), and...
Use JavaScript and Numverify to Verify Phone Numbers
Have you ever had problems with wrong phone numbers in your business? Checking phone numbers to ensure they're correct is important for businesses. It helps keep customer details correct, improves communication, and ensures messages get to the right people. In this...