react-intl vs next-intl
Internationalization (i18n) in React Applications Comparison
3 Years
react-intlnext-intlSimilar Packages:
What's Internationalization (i18n) in React Applications?

Internationalization (i18n) libraries in React help developers create applications that support multiple languages and cultures. These libraries provide tools for translating text, formatting dates and numbers, and managing locale-specific content. They enable developers to build inclusive applications that cater to a global audience by providing seamless language switching and culturally appropriate formatting. next-intl is designed specifically for Next.js applications, offering features like server-side rendering (SSR) support, automatic locale detection, and optimized performance for dynamic content. react-intl, part of the FormatJS suite, provides a comprehensive set of APIs for handling translations, formatting, and managing locales in React applications, making it suitable for both small and large projects.

Package Weekly Downloads Trend
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Package
Downloads
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react-intl1,782,068
14,559237 kB354 months agoBSD-3-Clause
next-intl775,108
3,637244 kB46a day agoMIT
Feature Comparison: react-intl vs next-intl

Framework Integration

  • react-intl:

    react-intl is a framework-agnostic library that can be used with any React application, regardless of the build setup. While it does not provide specific features for Next.js, it is highly flexible and can be integrated into any React project.

  • next-intl:

    next-intl is built specifically for Next.js, providing deep integration with its features like server-side rendering, static site generation, and API routes. This makes it a natural choice for Next.js developers looking for an i18n solution that leverages the framework's capabilities.

Server-Side Rendering (SSR)

  • react-intl:

    react-intl supports server-side rendering, but it requires manual setup to ensure that translations are loaded and rendered correctly on the server. This can add complexity to the implementation.

  • next-intl:

    next-intl offers built-in support for server-side rendering, allowing translations to be rendered on the server before being sent to the client. This improves performance and SEO by ensuring that the initial HTML is fully localized.

Automatic Locale Detection

  • react-intl:

    react-intl does not include automatic locale detection by default, but it can be implemented manually by detecting the user's locale and passing it to the library. This requires additional coding but allows for greater customization.

  • next-intl:

    next-intl provides automatic locale detection based on the user's browser settings, making it easy to serve the correct language without additional configuration. This feature enhances the user experience by providing localized content out of the box.

Performance Optimization

  • react-intl:

    react-intl is generally performant, but its flexibility and feature richness can lead to increased bundle size and runtime overhead if not managed carefully. Developers should be mindful of this when using the library in large applications.

  • next-intl:

    next-intl is optimized for performance in Next.js applications, with features like static optimization and minimal runtime overhead. This makes it suitable for large applications where performance is a concern.

Ease of Use: Code Examples

  • react-intl:

    react-intl offers a comprehensive API for internationalization, but its complexity can be daunting for beginners. The documentation is extensive, with examples and guides that help developers understand how to use the library effectively. However, the learning curve may be steeper compared to simpler i18n solutions.

  • next-intl:

    next-intl provides a simple and intuitive API for managing translations in Next.js applications. Its documentation is clear, and it offers examples that make it easy to integrate into projects. The library is designed to be developer-friendly, with a focus on reducing complexity while providing powerful features.

Code Example

  • react-intl:

    React i18n Example with react-intl

    import React from 'react';
    import { IntlProvider, FormattedMessage } from 'react-intl';
    
    const messages = {
      en: { hello: 'Hello' },
      fr: { hello: 'Bonjour' },
    };
    
    const App = () => {
      const [locale, setLocale] = React.useState('en');
    
      return (
        <IntlProvider locale={locale} messages={messages[locale]}>
          <div>
            <h1><FormattedMessage id="hello" /></h1>
            <button onClick={() => setLocale('fr')}>Switch to French</button>
          </div>
        </IntlProvider>
      );
    };
    
    export default App;
    
  • next-intl:

    Next.js i18n Example with next-intl

    // app/i18n.ts
    export const messages = {
      en: { hello: 'Hello' },
      fr: { hello: 'Bonjour' },
    };
    
    // app/layout.tsx
    import { IntlProvider } from 'next-intl';
    import { messages } from './i18n';
    
    export default function RootLayout({ children, params }) {
      const locale = params.locale || 'en';
      return (
        <IntlProvider locale={locale} messages={messages[locale]}>
          {children}
        </IntlProvider>
      );
    }
    
    // app/page.tsx
    export default function Page() {
      return <h1>{intl.formatMessage({ id: 'hello' })}</h1>;
    }
    
How to Choose: react-intl vs next-intl
  • react-intl:

    Choose react-intl if you need a robust and flexible i18n solution for React applications of any size. It offers a comprehensive set of APIs for managing translations, formatting, and localization, making it suitable for both simple and complex projects.

  • next-intl:

    Choose next-intl if you are building a Next.js application and need optimized i18n support with features like server-side rendering, automatic locale detection, and a focus on performance. It is ideal for projects that require seamless integration with Next.js features.

README for react-intl

React Intl

We've migrated the docs to https://formatjs.github.io/docs/getting-started/installation.