react-lazy-flags

A React component library for country flags with lazy loading support using React Suspense.

Features

• 🚀 Lazy Loading: Flags are loaded on-demand, reducing initial bundle size
• ⚡ Suspense Support: Built-in Suspense integration for smooth loading states
• 🎨 SVG Flags: High-quality SVG flag components
• 📦 Tree-shakeable: Only load the flags you actually use
• 🔧 TypeScript: Full TypeScript support
• 🎯 400+ Flags: Comprehensive collection of country and regional flags

Installation

Install from npm:

npm install react-lazy-flags

yarn add react-lazy-flags

pnpm add react-lazy-flags

bun add react-lazy-flags

Usage

Basic Usage

import { Suspense } from "react";
import { Flag } from "react-lazy-flags";

function App() {
  return (
    <div>
      <Flag code="us" width={64} height={64} />
      <Flag code="gb" width={64} height={64} />
      <Flag code="fr" width={64} height={64} />
    </div>
  );
}

With Custom Fallback

import { Suspense } from "react";
import { Flag } from "react-lazy-flags";

function App() {
  return (
    <div>
      <Flag
        code="us-ca"
        width={64}
        height={64}
        fallback={<div>Loading California flag...</div>}
      />
    </div>
  );
}

Multiple Flags

import { Suspense } from "react";
import { Flag } from "react-lazy-flags";

function FlagList() {
  const countries = ["us", "gb", "fr", "de", "jp"];

  return (
    <div>
      {countries.map((code) => (
        <Flag key={code} code={code} width={48} height={48} />
      ))}
    </div>
  );
}

API

Flag Component

The main component for rendering country flags.

Props

| Prop | Type | Required | Default | Description | | ---------- | ------------------------- | -------- | -------------- | ------------------------------------------------------- | | code | string | Yes | - | Country or region code (e.g., "us", "gb", "us-ca") | | fallback | React.ReactNode | No | <Skeleton /> | Custom fallback component for Suspense | | ...props | SVGProps<SVGSVGElement> | No | - | All standard SVG props (width, height, className, etc.) |

Flag Codes

Flag codes follow the pattern:

• Country codes: ISO 3166-1 alpha-2 (e.g., us, gb, fr)
• Regional flags: country-region (e.g., us-ca for California, gb-eng for England)
• Special flags: Various special flags are also supported

How It Works

The library uses React's lazy() and Suspense to enable code splitting. Each flag component is loaded only when it's first rendered, which means:

• Initial bundle size is minimal
• Flags are loaded on-demand
• Better performance for applications with many flags
• Automatic code splitting per flag

Requirements

• React 18.0.0 or higher
• React DOM 18.0.0 or higher

Credits

The flag SVG designs are based on circle-flags by HatScripts, a collection of 400+ minimal circular SVG country, state and language flags.

License

MIT