lite-phone-input

Lightweight phone input with format-as-you-type, validation, and emoji flags. ~13KB gzipped total — zero runtime dependencies.

Why lite-phone-input?

Features

• ~13KB gzipped (JS + country data) — includes formatting AND validation
• Emoji flags computed from ISO code at runtime (zero image cost)
• Format-as-you-type with per-country masks (~240 countries)
• Per-country length validation with rich error data
• TypeScript-first with full type definitions
• Framework adapters — Vanilla JS, React, Preact
• Accessible — WCAG 2.1 AA, ARIA combobox pattern, keyboard navigation
• SSR-safe — no browser API calls at module level

Installation

npm install lite-phone-input

Quick Start

Vanilla JS

import { PhoneInput } from 'lite-phone-input/vanilla';
import 'lite-phone-input/styles';

const phone = PhoneInput.mount(document.getElementById('phone'), {
  defaultCountry: 'US',
  separateDialCode: true,
  onChange(e164, country, validation) {
    console.log(e164);           // '+12025551234'
    console.log(country.code);   // 'US'
    console.log(validation.valid); // true
  },
});

React

import { useRef } from 'react';
import { PhoneInput } from 'lite-phone-input/react';
import 'lite-phone-input/styles';

function MyForm() {
  const phoneRef = useRef(null);

  return (
    <PhoneInput
      ref={phoneRef}
      defaultCountry="US"
      separateDialCode
      initialValue="+12025551234"
      onChange={(e164) => console.log(e164)}
      name="phone"
      aria-label="Phone number"
    />
  );
}

Preact

import { PhoneInput } from 'lite-phone-input/preact';
import 'lite-phone-input/styles';

Same API as React. Uses preact/hooks directly — no preact/compat required.

CDN / Script Tag

<link rel="stylesheet" href="https://unpkg.com/lite-phone-input/dist/styles.css">
<script src="https://unpkg.com/lite-phone-input/dist/vanilla/index.global.js"></script>
<script>
  const phone = LitePhoneInput.PhoneInput.mount(document.getElementById('phone'), {
    defaultCountry: 'US',
  });
</script>

Geo IP Lookup

Auto-detect the user's country at mount time using any geo-IP service. The lookup runs once, and the result is ignored if the user has already interacted with the widget.

const phone = PhoneInput.mount(document.getElementById('phone'), {
  defaultCountry: 'US',
  geoIpLookup: (callback) => {
    // Cloudflare (free, no API key)
    fetch('/cdn-cgi/trace')
      .then(res => res.text())
      .then(text => {
        const match = text.match(/loc=(\w+)/);
        callback(match ? match[1] : null);
      })
      .catch(() => callback(null));
  },
});

// Alternative: ipapi.co
geoIpLookup: (callback) => {
  fetch('https://ipapi.co/json/')
    .then(res => res.json())
    .then(data => callback(data.country_code))
    .catch(() => callback(null));
}

Documentation

Browser Support

Chrome 80+, Firefox 80+, Safari 14+, Edge 80+. No IE support, no polyfills needed.

Contributing

See CONTRIBUTING.md for development setup and guidelines.

Changelog

See CHANGELOG.md for release history.

License

MIT