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Documentation Website

Build a Next.js documentation website with nested routes, MDX pages, search-friendly metadata, navigation, static generation, and deployment.

1. Learning Objectives

By the end of this project, you will be able to design a documentation website with nested routes, side navigation, content collections, search metadata, versioning basics, and static deployment behavior.

Difficulty: Intermediate.

2. Prerequisites

  • File routing.
  • Layouts.
  • MDX or content loading.
  • SEO basics.

    • 3. Overview

    A documentation website is a structured content product. It needs stable URLs, nested navigation, fast static pages, good search indexing, code examples, and clear versioning decisions.

    4. Why This Topic Matters

    Docs are often the first product surface developers use. A well-built docs site reduces support load, improves adoption, and proves that your routing and content model can scale.

    5. Real-World Analogy

    A docs site is a map with trails. The homepage shows the region, the sidebar shows nearby paths, and each page gives precise instructions for one stop.

    6. Core Concepts

    ConceptRole in Docs
    Catch-all routeRenders nested docs paths.
    Section layoutShared sidebar and table of contents.
    Content registryMaps slugs to files, titles, and order.
    MetadataHelps search engines and previews.
    Static generationMakes docs fast and reliable.

    7. Syntax & API Reference

    8. Visual Diagram

    9. Live Example - Full Working Code

    What just happened? A catch-all route renders every nested docs URL from a content registry while still allowing each page to have its own metadata.

    10. Interactive Playground

    Try this:

  • Add section ordering to the content registry.
  • Add a docs sidebar layout.
  • Add previous and next links.
  • Generate a search index during build.

    • 11. Common Mistakes

    MistakeWhy It HappensCorrect Approach
    Unstable doc URLsFile names are changed freely.Treat slugs as public contracts.
    Sidebar hardcoded in many filesNavigation starts small.Generate navigation from metadata.
    No 404 for missing docsContent lookup fails silently.Use notFound().
    Client-rendering all docsSearch/filter needs JS.Render content server-side and isolate search.

    12. Best Practices

  • Keep docs pages static when possible.
  • Use stable slugs and redirects for moved pages.
  • Generate sidebar navigation from one source of truth.
  • Add page metadata, sitemap entries, and Open Graph defaults.
  • Make search progressive: content first, JavaScript enhancement second.

    • 13. Browser Compatibility

    FeatureBrowser ImpactNotes
    Static docs pagesExcellentContent loads without app-like delays.
    Search UIJavaScript enhancementDocs should remain browseable without it.
    Code blocksHTML plus CSSAvoid heavy client highlighters when possible.

    14. Interview Questions

    Easy: Why use a catch-all route for docs?

    Answer: It lets one route render many nested documentation paths.

    Medium: Why generate navigation from metadata?

    Answer: It avoids duplicated sidebar definitions and keeps ordering consistent with content.

    Hard: How would you support versioned documentation?

    Answer: Include the version in the route or content registry, generate params per version, preserve old URLs, and keep redirects for moved pages.

    15. Debugging Exercise

    Bug report: "Search engines index duplicate docs pages with and without trailing slashes."

    Solution

    Choose a canonical URL format, emit canonical metadata, and redirect alternate paths so each document has one authoritative URL.

    16. Practice Exercises

  • Easy: Add a docs catch-all route.
  • Medium: Generate sidebar navigation from docs metadata.
  • Hard: Add versioned docs with redirects for moved pages.

    • 17. Scenario-Based Challenge

    Your docs need product guides, API references, changelog pages, and versioned URLs. How should the content model work?

    Walkthrough

    Create a registry with section, slug, title, description, order, version, and source path. Generate routes, navigation, metadata, sitemap entries, and search records from that registry.

    18. Quick Quiz

    1. What route handles nested docs paths? Answer: app/docs/[...slug]. 2. What should missing docs call? Answer: notFound(). 3. What should define sidebar ordering? Answer: Content metadata. 4. What makes docs fast? Answer: Static generation. 5. What should moved pages use? Answer: Redirects.

    19. Summary & Key Takeaways

  • Documentation sites are structured content systems.
  • Catch-all routes work well for nested docs.
  • Static generation keeps docs fast and resilient.
  • Metadata and canonical URLs protect SEO quality.
  • A content registry keeps routes, navigation, search, and sitemaps aligned.

    • 20. Cheat Sheet

    NeedPattern
    Nested docs routeapp/docs/[...slug]
    Build all pagesgenerateStaticParams
    Page SEOgenerateMetadata
    Missing pagenotFound()
    SidebarGenerated from metadata

    21. Further Reading

  • Next.js Docs: Layouts and Pages.
  • Next.js Docs: Metadata and OG Images.
  • Next.js Docs: Static Generation.

    • 22. Next Lesson Preview

    Chapter 9 is complete. Next, you will prepare for Next.js interview questions and review the full course.