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Server Components

This guide explains how to use the internationalization package with React Server Components in your Next.js application.

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Overview

Server Components are rendered on the server and can directly access server-side resources. With the internationalization package, you can load translations directly in your Server Components without additional client-side JavaScript.

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Loading Translations

To use translations in a Server Component, import the getDictionary function and use it to load the appropriate dictionary based on the locale: 
import { getDictionary } from '@repo/internationalization';

export default async function ServerComponent({ params }: { params: { locale: string } }) {
  const dictionary = await getDictionary(params.locale);
  
  return (
    <div>
      <h1>{dictionary.web.header.home}</h1>
      <p>{dictionary.web.home.meta.description}</p>
    </div>
  );
}
The getDictionary function:
  1. Takes a locale string as input
  2. Loads the corresponding dictionary file
  3. Returns the dictionary object with all translations for that locale

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Accessing Nested Translations

Dictionary files are structured as nested objects. You can access nested translations using dot notation: 
// Access nested translations
<h2>{dictionary.web.home.features.title}</h2>
<p>{dictionary.web.home.features.description}</p>

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Working with Arrays

If your translations include arrays, you can map over them to render multiple elements: 
// Translation dictionary structure:
// {
//   "web": {
//     "home": {
//       "features": {
//         "items": [
//           { "title": "Feature 1", "description": "Description 1" },
//           { "title": "Feature 2", "description": "Description 2" }
//         ]
//       }
//     }
//   }
// }

{dictionary.web.home.features.items.map((feature, index) => (
  <div key={index} className="feature">
    <h3>{feature.title}</h3>
    <p>{feature.description}</p>
  </div>
))}

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Handling Dynamic Content

You can combine translations with dynamic content: 
// Assuming the translation has a placeholder: "Welcome, {name}!"
<p>{dictionary.web.greeting.replace('{name}', user.name)}</p>

// For more complex replacements, you can use a helper function
function formatMessage(template: string, values: Record<string, string>) {
  return template.replace(/{(\w+)}/g, (_, key) => values[key] || '');
}

<p>
  {formatMessage(dictionary.web.lastLogin, { 
    date: new Date().toLocaleDateString(params.locale),
    time: new Date().toLocaleTimeString(params.locale)
  })}
</p>

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Fallback Handling

The getDictionary function includes built-in fallback handling. If a translation is not available in the requested locale, it will fall back to English: 
// This will use the English translation if the Spanish one doesn't exist
const dictionary = await getDictionary('es');
You can also implement your own fallback logic for specific cases: 
const title = dictionary.web.specialPage?.title || dictionary.web.defaultPage.title;

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Metadata and SEO

You can use translations for page metadata to improve SEO: 
import { getDictionary } from '@repo/internationalization';
import { Metadata } from 'next';

export async function generateMetadata({ 
  params 
}: { 
  params: { locale: string } 
}): Promise<Metadata> {
  const dictionary = await getDictionary(params.locale);
  
  return {
    title: dictionary.web.home.meta.title,
    description: dictionary.web.home.meta.description,
    openGraph: {
      title: dictionary.web.home.meta.title,
      description: dictionary.web.home.meta.description,
      locale: params.locale,
    },
  };
}

export default async function HomePage({ params }: { params: { locale: string } }) {
  const dictionary = await getDictionary(params.locale);
  
  return (
    <div>
      <h1>{dictionary.web.home.meta.title}</h1>
      <p>{dictionary.web.home.meta.description}</p>
    </div>
  );
}

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Passing Translations to Client Components

To use translations in Client Components, you need to pass them from a Server Component: 
import { getDictionary } from '@repo/internationalization';
import { TranslationProvider } from '@repo/internationalization/TranslationProvider';
import ClientComponent from '@/components/ClientComponent';

export default async function ServerComponent({ params }: { params: { locale: string } }) {
  const dictionary = await getDictionary(params.locale);
  
  return (
    <div>
      <h1>{dictionary.web.header.home}</h1>
      
      {/* Pass translations to Client Component */}
      <TranslationProvider locale={params.locale} messages={dictionary}>
        <ClientComponent />
      </TranslationProvider>
    </div>
  );
}

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Best Practices

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Examples

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Basic Page with Translations

// app/[locale]/about/page.tsx
import { getDictionary } from '@repo/internationalization';

export default async function AboutPage({ params }: { params: { locale: string } }) {
  const dictionary = await getDictionary(params.locale);
  
  return (
    <div className="about-page">
      <h1>{dictionary.web.about.title}</h1>
      <p>{dictionary.web.about.description}</p>
      
      <section className="team">
        <h2>{dictionary.web.about.team.title}</h2>
        <div className="team-members">
          {dictionary.web.about.team.members.map((member, index) => (
            <div key={index} className="team-member">
              <h3>{member.name}</h3>
              <p>{member.role}</p>
              <p>{member.bio}</p>
            </div>
          ))}
        </div>
      </section>
    </div>
  );
}

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Dynamic Routes with Translations

// app/[locale]/blog/[slug]/page.tsx
import { getDictionary } from '@repo/internationalization';

export default async function BlogPost({ 
  params 
}: { 
  params: { locale: string; slug: string } 
}) {
  const dictionary = await getDictionary(params.locale);
  const post = await fetchBlogPost(params.slug);
  
  return (
    <article>
      <h1>{post.title}</h1>
      <p className="date">
        {dictionary.web.blog.publishedOn.replace('{date}', 
          new Date(post.date).toLocaleDateString(params.locale)
        )}
      </p>
      <div className="content">{post.content}</div>
      
      <div className="related-posts">
        <h2>{dictionary.web.blog.relatedPosts}</h2>
        {/* Related posts content */}
      </div>
    </article>
  );
}

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Next Steps

Client Components

Learn how to use translations in client components

Adding Languages

How to add support for new languages