Phone number guides

Tutorials for validating, formatting and enriching phone numbers in JavaScript, Python and PHP, plus explanations of E.164 and line types.

Tutorial · Python

Validate phone numbers in Python

Validate and format phone numbers in Python with the phonenumbers library, then add carrier and line type with the numlookupapi API. Copy-paste code for Django and Flask.

Tutorial · PHP

Validate phone numbers in PHP

Validate phone numbers in PHP with libphonenumber-for-php and the numlookupapi API. Includes a Laravel validation rule and E.164 formatting.

Tutorial · JavaScript

Validate phone numbers in JavaScript

Three ways to validate phone numbers in JavaScript and Node.js: regex, libphonenumber-js and a phone validation API with carrier and line type. With code.

Guide

E.164 phone number format explained

What the E.164 format is, how to convert any phone number to E.164, examples for 10 countries, a regex and why APIs like Twilio require it.

Comparison

Best phone number validation APIs in 2026

A comparison of phone number validation APIs in 2026: numlookupapi, numverify, Twilio Lookup, Abstract, Vonage Number Insight and libphonenumber. Features, free tiers and prices.

Phone number API

Validate numbers like this in your app

numlookupapi checks any phone number worldwide in one request and returns validity, line type, carrier, location and every standard format as JSON.

Read the documentation

100 free requests every month. No credit card required.

GET https://api.numlookupapi.com/v1/validate/+12069220880

{
  "valid": true,
  "number": "12069220880",
  "local_format": "2069220880",
  "international_format": "+12069220880",
  "country_prefix": "+1",
  "country_code": "US",
  "country_name": "United States of America",
  "location": "Seattle",
  "line_type": "landline",
  "e164_format": "+12069220880",
  "national_format": "(206) 922-0880"
}