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Bytes issue #120 points to a compact Deno example that puts a small server-rendered website—its server setup, routes, and page components—in one JavaScript file. It is a demonstration of how familiar website behavior can fit into a small example, not a recommendation to organize every production application this way.
What “a whole website in one file” means
The example is not one static HTML document. A JavaScript server handles requests, chooses a route, renders the corresponding page, and returns an HTML response. The route handlers and shared page structure are kept together in a single source file.
Leo Kettmeir’s Deno article, published April 5, 2022, describes the pages as being rendered dynamically at the edge. It also says: “Everything mentioned here can be viewed on a playground.” Read the original example.
How the original example is organized
The 2022 sample imports serve from Deno’s standard library, router from crux.land, and h and ssr from nanossr. A render helper wraps each route’s content in a shared App component, which supplies the common navigation and page wrapper.
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The router maps a small set of paths to page components. The article says the router uses URLPattern underneath.
| Path | Page behavior in the original example |
|---|---|
/ |
Landing page |
/stats |
Stats page |
/bagels |
Bagel page |
| Unmatched path | Fallback handler |
nanossr turns JSX returned by a callback into a Response. The article says it uses twind under the hood for styling. In effect, the same language and component-like structure describe the server-rendered pages, while the server returns HTML to the browser.
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What the follow-up adds
A September 2022 continuation extends the demo; these features are not part of the first post’s route list.
- Request-dependent rendering: The page can render a location and local time dynamically.
- Parameterized paths: A route such as
/bagels/:idcan identify an individual bagel. - Search through a GET form: Submitting the form places the entered value in a
searchquery parameter. The route reads that parameter and filters the bagel list.
The continuation is available at Deno’s follow-up article.
What the 2022 hosting claims do—and do not—show
The original article reported that its hosted example was served through an anycast IP from 29 data centers and described the demo as achieving a “perfect pagespeed score.” Those are claims made by Deno in 2022, not current network statistics or independently reproducible performance results: the post does not provide a test setup that would establish a comparable score today. Its statements about hosting footprint and zero-cost availability are historical as well.
Deno’s current documentation describes Deno Deploy as a serverless platform for JavaScript and TypeScript applications. It distinguishes the current product from Deploy Classic and says Deploy Classic and the subhosting v1 API were scheduled to shut down on July 20, 2026. The documentation page was last updated July 9, 2026. For current service details, consult Deno Deploy’s documentation; the old article does not establish current pricing or service availability.
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When this one-file pattern makes sense
A compact example can make it easy to see how request handling, routing, shared layout, and page rendering fit together. Whether keeping those parts in one file helps a real project depends on its needs; the source does not compare frameworks or establish that one-file organization is better for production.
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- Route shape: A few fixed routes are easy to inspect in a short route table; parameterized paths add another kind of behavior.
- Content needs: A mostly fixed page has different needs from content that changes by request, such as the location and local time in the follow-up.
- Interaction needs: The GET-form search shows a small amount of request-driven behavior. More forms, APIs, or application logic may change how clearly a single file communicates the design.
- Shared structure: A common component avoids repeating the navigation and wrapper. Consider whether keeping it beside every route remains clearer as the application grows.
- Deployment fit: Choose a hosting approach based on the project’s actual runtime and deployment requirements, using current service documentation rather than historical claims in the 2022 walkthrough.
Reusing the example today
Treat the original imports and package versions as a snapshot from 2022, not as current installation advice. Before adapting the code, verify that the Deno runtime and each dependency version remain compatible with the APIs and deployment target you intend to use. The article is useful for understanding the structure of the demonstration; it does not verify that its pinned dependencies still work unchanged.
The original post appeared via Bytes issue #120, dated September 19, 2022.
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