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 with Python phonenumbers, add carrier and line type with the numlookupapi API, check lists in batches, plus a Django form.

Tutorial · PHP

Validate phone numbers in PHP

Phone number validation in PHP with libphonenumber-for-php and the numlookupapi API: E.164 formatting, carrier and line type, batches and a Laravel rule.

Tutorial · JavaScript

Validate phone numbers in JavaScript

Phone number validation in JavaScript and Node.js: a regex, libphonenumber-js and a validation API with carrier and line type, plus batches. Tested code.

Guide

E.164 phone number format explained

What the E.164 format is, examples for 11 countries, how to convert any number to E.164 in JavaScript, Python and PHP, a tested regex, and how to store numbers.

Comparison

Best phone number validation APIs in 2026

Phone validation APIs compared: numlookupapi, Twilio Lookup, Vonage, Abstract, Numverify, Telesign and libphonenumber: data, free tiers and 2026 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

250 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"
}