Organize your components and layouts in your pages-based Next.js application this way.

When building a Next.js application, organizing your components and layouts efficiently is crucial for maintaining a clean, scalable codebase. In this blog post, we will look at a practical example of structuring your components and layouts using a page-based approach, inspired by Supabase’s codebase.

Understanding the Page-Based Approach

Next.js uses a pages directory where each file corresponds to a route in your application. This structure is intuitive, but as your app grows, it is very important to organize components and layouts in a way that promotes reusability and clarity.

Example: Sign-In Page Structure

Let’s look at real-world example by examining the structure of a SignInPage component in Supabase source code.

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Components and Layouts: A Clear Separation

Notice how the components and layouts are organized:

• **components/interfaces/SignIn/SignInForm**: This directory holds the SignInForm component, specifically related to the Sign-In interface. By organizing components within a relevant interface folder, you ensure that related components are grouped together, making them easier to find and manage.
• **components/layouts/SignInLayout/SignInLayout**: The SignInLayout component is separated into its own layout directory. This keeps the layout logic distinct from the individual components, allowing you to reuse the layout across different pages.
• **lib/constants**: The IS_PLATFORM constant is imported from a centralized location. This is a good practice for managing global constants that might be used across multiple components.

In fact, Supabase component folder has a good explanation about this approach.

Adding the Layout

One of the strengths of Next.js is its ability to define layouts on a per-page basis. The SignInPage component is wrapped in a SignInLayout that defines the overall structure of the page:

SignInPage.getLayout = (page) => (
  <SignInLayout
    heading="Welcome back"
    subheading="Sign in to your account"
    logoLinkToMarketingSite={true}
  >
    {page}
  </SignInLayout>
)
export default SignInPage

Conclusion

Organizing your components and layouts in a pages-based Next.js application this way promotes a clean, scalable structure. By grouping related components and separating layout logic, you create a maintainable codebase that’s easy to extend as your application grows.

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Further reading:

1. https://github.com/supabase/supabase/blob/master/apps/studio/pages/sign-in.tsx
2. https://github.com/supabase/supabase/tree/master/apps/studio/components/interfaces
3. https://github.com/supabase/supabase/tree/master/apps/studio/components/layouts
4. https://nextjs.org/docs/pages/building-your-application/routing/pages-and-layouts#per-page-layouts

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