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A useful Next.js architecture diagram must be version- and router-aware. The diagram below models a current App Router application: layouts and pages are Server Components by default, Client Components form explicit browser-side boundaries, and the server can prerender or render at request time. The original Pages Router remains supported, but its data-fetching and rendering path is different. Label every diagram with the router, Next.js version, rendering configuration, and deployment topology it represents.
The reference architecture
Next.js is a React framework for full-stack web applications. It has two routing systems: the newer App Router and the original Pages Router. App Router uses newer React capabilities; Pages Router is still supported. The official Next.js documentation and App Router guide should be treated as the version-specific authority when you update a diagram.
Use this conceptual diagram for an App Router deployment. It separates the browser, Next.js runtime, data sources, and infrastructure, and it labels HTML and the RSC Payload as different outputs.
Browser
| initial request / navigation
v
Reverse proxy (recommended for self-hosting)
|
v
Next.js runtime (Node.js server or supported platform)
|-- App Router: layouts, pages, Server Components
| |-- prerender at build or revalidation time
| |-- dynamic render at request time
| |-- RSC Payload --------------------+
| |-- pre-rendered HTML --------------|----> Browser display
| |-- streamed server output ---------+
|
|-- Client Component bundles --------------> Browser download and hydration
|
+-- data sources (database, APIs, files, services)
Later navigation:
Link enters viewport -> route prefetch -> RSC Payload -> client transition
Caching and invalidation:
static output / data cache / revalidation / tags
(behavior depends on route, APIs, configuration, and deployment topology)This is an architecture model, not a promise that every application has each box. A Next.js Server Component can fetch a data source directly; the production checklist advises against calling a Route Handler from a Server Component merely to make another server request. Add a separate backend box only when your application actually uses one.
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App Router and Pages Router are different diagrams
| Concern | App Router | Pages Router |
|---|---|---|
| Route organization | File-system routes built from layouts, pages, and related conventions under the App Router. | Original file-system router, still supported. |
| Component default | Layouts and pages are Server Components by default. | Uses the Pages Router model rather than the App Router Server/Client Component default. |
| Browser-side code | Use a 'use client' boundary for state, event handlers, lifecycle behavior, or browser APIs. |
Client-side React behavior follows the Pages Router conventions. |
| Initial response | Server Component tree produces an RSC Payload and pre-rendered HTML; Client Components hydrate in the browser. | Draw the Pages Router data-fetching and rendering methods used by that project instead of copying the App Router flow. |
| Navigation | Prefetched RSC Payloads and client-side transitions can update the route without a full document navigation. | Use the Pages Router navigation behavior documented for the installed version. |
Do not combine both routers into one undifferentiated pipeline. If a repository contains app/ and pages/, draw two route branches and identify which URLs are handled by each.
Where the Server Component and Client Component boundary sits
In App Router, the component tree starts on the server. A file containing 'use client' establishes a client module-graph boundary. Its imports and descendants become part of the client bundle, so place the boundary as deep as practical rather than marking an entire page when only a small control is interactive.
Keep on the server
- Layouts and pages that do not need browser APIs, local state, event handlers, or lifecycle hooks.
- Data access that can happen in the server runtime.
- Static or cacheable presentation that does not need to ship its implementation to the browser.
Move to the client deliberately
- Interactive forms, menus, drag-and-drop controls, and other event-driven UI.
- Components using state or lifecycle behavior.
- Code that reads browser APIs such as
windoworlocalStorage.
In the diagram, draw a solid boundary around the Server Component tree and a separate client-bundle arrow to the browser. Props and Client Component references are represented in the RSC Payload; they are not the same thing as the HTML document.
Initial-load rendering: build time, request time, HTML, and RSC Payload
Next.js has two broad server-rendering moments. Prerendering occurs at build time or during a later revalidation. Dynamic rendering occurs when a request needs fresh, request-specific work. A single application can use both, and the boundary can exist at component level rather than only at route level.
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For content that can be generated ahead of a request, Next.js prepares output during the build or a configured revalidation event. Static rendering, caching, code splitting, and prefetching are common optimizations, but the actual result depends on the data and APIs used by the route.
2. Render the Server Component tree
The server evaluates the Server Component tree and serializes the result as an RSC Payload. The payload describes the rendered Server Components, Client Component references, and the props needed by those client boundaries.
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3. Pre-render HTML for the first visit
Next.js uses the RSC result together with Client Components to produce HTML for the initial request. The browser can display that HTML before all client JavaScript has finished loading.
4. Reconcile and hydrate
The browser reconciles the displayed HTML with the RSC Payload, downloads the required client bundles, and hydrates Client Components so event handlers and browser-side behavior work. Server-only code does not become a browser bundle merely because it contributed to the page.
Draw the HTML arrow and the RSC Payload arrow separately. HTML is what the browser can display immediately; the payload is the structured representation used to reconcile the React tree and wire Client Components.
Navigation after the first page
App Router navigation layers together prefetching, server rendering, streaming, and client-side transitions. A Link can prefetch a route when the link enters the viewport. The client can then request or consume a prefetched RSC Payload and update the relevant layouts and page without reloading the entire document.
- The user sees a link or triggers navigation.
- When eligible, Next.js prefetches the route while the link is in the viewport.
- The server prepares the route’s RSC Payload, using prerendered or dynamic work as required.
- The browser applies the payload in a client transition and renders Client Components on the client.
- If parts of the response are delayed, streaming can deliver available output progressively for features that support it.
Prefetching and transitions reduce perceived waiting in many cases; they are not a universal latency guarantee. A diagram should show the navigation path as distinct from the initial HTML document request.
Rendering, caching, and revalidation decisions
Do not label every App Router route “static” or “dynamic” without checking its code and configuration. Dynamic APIs such as cookies and searchParams can opt rendering into dynamic behavior. Uncached data, explicit configuration, and request-dependent logic can have the same effect.
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| Diagram label | When it applies | What to show |
|---|---|---|
| Static or prerendered | Output can be generated at build or revalidation time. | Build/revalidation job feeding HTML, RSC Payload, and cached data. |
| Dynamic request render | Request-specific APIs or uncached work require execution when the request arrives. | Browser request entering the runtime, then data sources and streamed output. |
| Cached data or output | Configured caches retain reusable results. | Cache read on the request path and an invalidation/revalidation arrow. |
| Cache Components (opt-in) | Projects using the documented Cache Components feature. | A static shell plus cached or deferred dynamic components, clearly marked as configuration-dependent. |
Cache Components are documented as an opt-in feature that can combine a static shell with cached or deferred dynamic content. Confirm the installed Next.js version and configuration before drawing this path; do not treat it as a default for all applications. For a production diagram, annotate each important component with its data mode: static, cached, revalidated, dynamic, or deferred.
Deployment topology and self-hosting
The current deployment guidance identifies a Node.js server as the minimum platform requirement for the described Next.js features. A single next start process can handle the application, while a reverse proxy is recommended in front of a self-hosted server.
Single instance
Draw the reverse proxy forwarding to one Node.js Next.js process, with that process reaching the data sources. This is the simplest topology and avoids cross-instance cache coordination.
Multiple instances
When several instances serve the App Router application, add a shared cache and an invalidation coordinator. A tag invalidation performed on one instance does not automatically invalidate the others without coordination. The deployment guide recommends shared cache for consistency; edge stitching is described as an optimization rather than a universal requirement.
Streaming requirements
Streaming is needed for progressive delivery of Server Components and Partial Prerendering where those features are used. Ensure the platform, proxy, and caching layer pass streamed responses instead of buffering them into one delayed document.
What belongs outside the Next.js box
- Reverse proxy: TLS termination, request forwarding, and any buffering or compression behavior.
- Data services: databases, APIs, object storage, or other systems called by Server Components.
- Shared cache: a coordination layer for multi-instance output and tag invalidation.
- Observability and operations: logs, health checks, process supervision, and deployment automation.
How to create and validate your own diagram
- Identify the router. Check whether the route is in
app/,pages/, or both. Put “App Router” or “Pages Router” in the title. - Record the version and config. Note the installed Next.js version and whether experimental or opt-in features such as Cache Components are enabled.
- Mark component boundaries. Find every
'use client'file and draw the client bundle boundary at that module graph, not automatically around the whole route. - Classify each data dependency. Mark data as static, cached, revalidated, dynamic, or uncached based on the code and configuration.
- Draw both first-load outputs. Add separate arrows for pre-rendered HTML and the RSC Payload, followed by hydration of Client Components.
- Add navigation. Show Link prefetching, an RSC Payload request, and a client transition for later visits.
- Describe deployment. Include Node.js or the chosen platform, reverse proxy, instance count, streaming support, and shared-cache strategy.
- Test the labels. Compare the diagram with the production checklist and deployment documentation, then verify that the labels match the deployed configuration rather than a local development assumption.
Keep a small legend beside the finished diagram. For example: “solid arrows = request/response; dashed arrows = prefetch; blue boxes = server; orange boxes = client; cache icons = configured cache only.” This prevents readers from mistaking conceptual groupings for mandatory Next.js services.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting the architecture
The diagram shows a Client Component downloading server-only code
Check where 'use client' appears. Its imports and descendants join the client module graph. Move the directive deeper, split the interactive control, and keep server-only data access above the boundary.
The first page is blank until JavaScript loads
Verify that the route is producing pre-rendered HTML and that the deployment is not stripping or delaying the response. Remember that the RSC Payload and HTML have different roles; a payload alone is not a substitute for the initial document.
A route unexpectedly becomes dynamic
Search the route’s component tree for dynamic APIs such as cookies and searchParams, uncached data access, and explicit configuration. Update the diagram to show request-time rendering instead of assuming static output.
Users on different instances see stale data
In a multi-instance deployment, add shared cache and coordinated tag invalidation. An invalidation on one instance does not automatically reach the others.
Streaming appears to wait and arrive all at once
Inspect the reverse proxy and platform for response buffering. Streaming requires the infrastructure to pass chunks through for the features that depend on progressive delivery.
Navigation makes a full page request
Confirm that navigation uses the App Router and normal Next.js links, and check whether prefetching is disabled or prevented by the surrounding UI. Pages Router routes should be shown on their own documented path rather than diagnosed with App Router assumptions.
Performance, reliability, and cost notes
- Performance: Keep Client Component boundaries narrow, use prerendering where data permits, and represent prefetching and streaming accurately instead of promising a fixed response time.
- Reliability: Treat cache invalidation, proxy buffering, and multi-instance coordination as operational concerns. A diagram that omits them hides common production failure modes.
- Cost: Rendering location changes infrastructure needs. A static or cached component may require less request-time compute than a fully dynamic tree, while additional instances and shared cache add operational components. The documentation does not establish a universal cost or speed ranking for deployment platforms.
- Maintenance: Put the Next.js version, router, feature flags, and deployment date in the diagram footer. Revisit it after framework upgrades or topology changes.
FAQ
Should an architecture diagram include a separate API server?
Only if the application uses one. Server Components can fetch data sources directly, so adding a generic API tier can misrepresent the deployed system.
Is the RSC Payload the same as server-rendered HTML?
No. The payload represents the React Server Component result and Client Component references; HTML is the initial browser-display form produced alongside it.
Can one diagram cover both App Router and Pages Router?
It can show both as explicitly labeled branches, but do not merge their rendering and data-fetching steps into one pipeline.
Frequently Asked Questions
What should I write in the diagram title?
Include the router (App Router or Pages Router), the Next.js version, and any opt-in rendering or caching features so readers know the scope.
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Draw them through a shared coordination layer; an invalidation performed on one instance does not automatically invalidate the others.
What is the minimum self-hosted runtime shown by current guidance?
A Node.js server running the Next.js application, normally behind a reverse proxy; add shared cache when multiple instances must stay consistent.
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