` with `intent` pattern\n6. **SQLite persistence** — Val Town's project-scoped database\n7. **Loading states** — `useNavigation()` for optimistic UI\n\n## Project Structure\n\n```\n├── backend/\n│ ├── index.ts # Hono HTTP entry — SSR + data API + static files\n│ └── database.ts # Schema + all queries (one file, one table)\n├── frontend/\n│ ├── index.html # HTML shell template\n│ └── index.tsx # Client hydration + dataStrategy\n├── routes/\n│ ├── Home.tsx # The entire UI — todo list + add form\n│ ├── Home.loader.ts # Loads all todos from SQLite\n│ └── Home.action.ts # Handles \"add\" and \"toggle\" form submissions\n├── shared/\n│ └── routes.ts # Route tree (shared between server + client)\n└── README.md\n```\n\n## How It Works\n\n### Request Lifecycle\n\n```\nFirst visit (SSR):\n Browser → GET / → Hono → createStaticHandler → runs Home.loader\n → renderToString → full HTML response → Browser hydrates\n\nAfter hydration (SPA):\n User submits form → dataStrategy → POST / (X-Data-Request: true)\n → Hono → runs Home.action + Home.loader → JSON response\n → React Router updates UI\n```\n\n### Key Pattern: `serverLoader` / `serverAction`\n\nThe route tree in `shared/routes.ts` is imported by both server and client. The helpers make this work:\n\n- **On the server**: dynamically import the real loader/action and call it\n- **On the client**: return a no-op stub (the `dataStrategy` handles fetching)\n\nThis means loader/action code and database dependencies **never ship to the browser**.\n\n### Key Pattern: `dataStrategy` (Single-Fetch)\n\nInstead of React Router calling each loader individually on the client, a custom `dataStrategy` in `frontend/index.tsx` makes **one HTTP request** with an `X-Data-Request: true` header. The server runs all matched loaders/actions and returns their data as keyed JSON.\n\n## Extending This\n\n| Want to add... | What to do |\n|---|---|\n| **More pages** | Add routes to `shared/routes.ts` with new `Component`, `loader`, `action` |\n| **Nested layouts** | Use `children` array in routes + `` in parent component |\n| **More tables** | Add queries to `backend/database.ts` (or split into separate files) |\n| **Search** | Add a route with a loader that reads `new URL(request.url).searchParams` |\n| **Redirects from actions** | Return `redirect(\"/path\")` — the `dataStrategy` handles it automatically |\n\n## Getting Started\n\n1. **Fork this val** on Val Town\n2. The database auto-initializes on first request\n3. Visit the HTTP endpoint to see the app\n4. Start extending!\n\n## Tech Stack\n\n| Layer | Technology |\n|-------|-----------|\n| Server | [Hono](https://hono.dev/) |\n| Routing | [React Router 7](https://reactrouter.com/) |\n| UI | [React 18](https://react.dev/) |\n| Styling | [Twind](https://twind.dev/) (Tailwind via CDN) |\n| Database | Val Town SQLite (`std/sqlite@14-main`) |\n| Runtime | Val Town (Deno) |\n","label",[97],"3b259436-0f87-11f1-bedc-42dde27851f2",["D",1771720891213],[108],"3b25823e-0f87-11f1-bedc-42dde27851f2",["D",1771720891213],[128],"3b25359a-0f87-11f1-bedc-42dde27851f2",["D",1771720891213],[194],"3b24d97e-0f87-11f1-bedc-42dde27851f2",["D",1771720891213],[253],"pulls","branches","forks","envVars",{"_273":276,"_400":276},"connections",{"_273":276,"_399":276},"unfilledCount","emptyCount",{"_27":389,"_13":253,"_95":252,"_36":-5,"_29":30,"_372":20,"_374":291,"_31":491,"_33":276,"_98":109,"_376":-5,"_99":24,"_378":-5,"_417":492,"_332":493},{"_27":486,"_13":266,"_95":487,"_36":252,"_29":30,"_372":317,"_374":291,"_31":488,"_33":276,"_98":109,"_376":-5,"_99":24,"_378":-5,"_417":489,"_332":490},{"_27":478,"_13":479,"_95":480,"_36":252,"_29":30,"_372":481,"_374":291,"_31":482,"_33":276,"_98":116,"_376":483,"_99":24,"_378":-5,"_417":484,"_332":485},{"_27":472,"_13":259,"_95":258,"_36":252,"_29":30,"_372":473,"_374":291,"_31":474,"_33":20,"_98":260,"_376":475,"_99":24,"_378":-5,"_417":476,"_332":477},{"_27":386,"_13":194,"_95":193,"_36":-5,"_29":30,"_372":20,"_374":291,"_31":469,"_33":276,"_98":109,"_376":-5,"_99":24,"_378":-5,"_417":470,"_332":471},{"_27":464,"_13":212,"_95":465,"_36":193,"_29":30,"_372":317,"_374":291,"_31":466,"_33":276,"_98":109,"_376":-5,"_99":24,"_378":-5,"_417":467,"_332":468},{"_27":458,"_13":206,"_95":205,"_36":193,"_29":30,"_372":459,"_374":291,"_31":460,"_33":20,"_98":47,"_376":461,"_99":24,"_378":-5,"_417":462,"_332":463},{"_27":452,"_13":200,"_95":199,"_36":193,"_29":30,"_372":453,"_374":291,"_31":454,"_33":20,"_98":116,"_376":455,"_99":24,"_378":-5,"_417":456,"_332":457},{"_27":383,"_13":128,"_95":127,"_36":-5,"_29":30,"_372":20,"_374":291,"_31":449,"_33":276,"_98":109,"_376":-5,"_99":24,"_378":-5,"_417":450,"_332":451},{"_27":441,"_13":442,"_95":443,"_36":127,"_29":30,"_372":444,"_374":291,"_31":445,"_33":276,"_98":116,"_376":446,"_99":24,"_378":-5,"_417":447,"_332":448},{"_27":435,"_13":182,"_95":181,"_36":127,"_29":30,"_372":436,"_374":291,"_31":437,"_33":20,"_98":116,"_376":438,"_99":24,"_378":-5,"_417":439,"_332":440},{"_27":429,"_13":176,"_95":175,"_36":127,"_29":30,"_372":430,"_374":291,"_31":431,"_33":20,"_98":116,"_376":432,"_99":24,"_378":-5,"_417":433,"_332":434},{"_27":380,"_13":108,"_95":107,"_36":-5,"_29":30,"_372":20,"_374":291,"_31":426,"_33":276,"_98":109,"_376":-5,"_99":24,"_378":-5,"_417":427,"_332":428},{"_27":420,"_13":122,"_95":121,"_36":107,"_29":30,"_372":421,"_374":291,"_31":422,"_33":20,"_98":116,"_376":423,"_99":24,"_378":-5,"_417":424,"_332":425},{"_27":371,"_13":97,"_95":96,"_36":-5,"_29":30,"_372":373,"_374":291,"_31":416,"_33":20,"_98":47,"_376":377,"_99":24,"_378":-5,"_417":418,"_332":419},["D",1771720998652],"children",[],[97],"51cae6fa-0f87-11f1-bc98-42dde27851f2",22,["D",1771720929235],"import {\n type ActionFunctionArgs,\n type LoaderFunctionArgs,\n} from \"https://esm.sh/react-router@7.5.0?deps=react@18.2.0,react-dom@18.2.0\";\nimport { Home } from \"../routes/Home.tsx\";\n\nlet isServer = typeof document === \"undefined\";\n\n// On the server, dynamically import the real loader/action function.\n// On the client, return a no-op stub. The stub's presence tells React Router\n// this route needs data, but the client's dataStrategy handles the actual\n// fetching via a single HTTP request to the server.\nfunction serverLoader(importURL: string) {\n if (isServer) {\n return async (args: LoaderFunctionArgs) => {\n let module = await import(importURL);\n return (module.loader || module.default)(args);\n };\n }\n return () => null;\n}\n\nfunction serverAction(importURL: string) {\n if (isServer) {\n return async (args: ActionFunctionArgs) => {\n let module = await import(importURL);\n return (module.action || module.default)(args);\n };\n }\n return () => null;\n}\n\nexport const routes = [\n {\n path: \"/\",\n Component: Home,\n loader: serverLoader(\"../routes/Home.loader.ts\"),\n action: serverAction(\"../routes/Home.action.ts\"),\n },\n];\n",[],[108,122],["D",1771720891213],[414],[108],"58167182-0f87-11f1-bc98-42dde27851f2",23,["D",1771720939795],"/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport {\n Form,\n useLoaderData,\n useNavigation,\n} from \"https://esm.sh/react-router@7.5.0?deps=react@18.2.0,react-dom@18.2.0\";\nimport React from \"https://esm.sh/react@18.2.0\";\nimport type { Todo } from \"../backend/database.ts\";\n\nexport function Home() {\n const { todos } = useLoaderData<{ todos: Todo[] }>();\n const navigation = useNavigation();\n const isAdding = navigation.state === \"submitting\"\n && navigation.formData?.get(\"intent\") === \"add\";\n const $form = React.useRef(null);\n\n // Reset the form after a successful submission\n React.useEffect(() => {\n if (navigation.state === \"idle\") $form.current?.reset();\n }, [navigation.state]);\n\n return (\n

Todo List

\n\n {/* Add todo form */}\n \n \n \n \n {isAdding ? \"Adding...\" : \"Add\"}\n \n \n\n {/* Todo list */}\n

\n
\n \n \n \n
\n \n {todo.text}\n \n

\n\n {todos.length === 0 && (\n

No todos yet. Add one above!

\n )}\n\n \n

\n );\n}\n",[],[128,176],"58b5ab94-0f87-11f1-bc98-42dde27851f2",24,["D",1771720940840],"import { getAllTodos } from \"../backend/database.ts\";\n\nexport async function loader() {\n return { todos: await getAllTodos() };\n}\n",[],[128,182],"4c35f036-0f87-11f1-8f72-42dde27851f2","Home.action.ts","4c35f0fe-0f87-11f1-8f72-42dde27851f2",21,["D",1771720919871],"import { ActionFunctionArgs } from \"https://esm.sh/react-router@7.5.0?deps=react@18.2.0,react-dom@18.2.0\";\nimport { addTodo, toggleTodo } from \"../backend/database.ts\";\n\nexport async function action({ request }: ActionFunctionArgs) {\n const formData = await request.formData();\n const intent = formData.get(\"intent\");\n\n if (intent === \"add\") {\n const text = formData.get(\"text\") as string;\n if (!text?.trim()) throw new Response(\"Text is required\", { status: 400 });\n await addTodo(text.trim());\n } else if (intent === \"toggle\") {\n const id = Number(formData.get(\"id\"));\n await toggleTodo(id);\n }\n\n return { ok: true };\n}\n",[],[128,442],["D",1771720891213],[410,411,412],[128],"69be20f6-0f87-11f1-8899-42dde27851f2",27,["D",1771720969416],"/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport { hydrateRoot } from \"https://esm.sh/react-dom@18.2.0/client\";\nimport {\n createBrowserRouter,\n redirect,\n RouterProvider,\n} from \"https://esm.sh/react-router@7.5.0?deps=react@18.2.0,react-dom@18.2.0\";\nimport React from \"https://esm.sh/react@18.2.0\";\nimport { routes } from \"../shared/routes.ts\";\n\n// Create a browser router with a custom dataStrategy for single-fetch.\n// Instead of React Router calling each loader individually, this makes ONE\n// HTTP request per navigation with an \"X-Data-Request: true\" header.\n// The server runs all matched loaders/actions and returns their data as JSON.\nconst router = createBrowserRouter(\n routes,\n {\n // @ts-ignore - hydrationData is injected by the server\n hydrationData: window.__staticRouterHydrationData,\n\n async dataStrategy({ request, matches }) {\n const matchesToLoad = matches.filter(m => m.shouldLoad);\n if (matchesToLoad.length === 0) return {};\n\n const fetchInit: RequestInit = {\n method: request.method,\n headers: { \"X-Data-Request\": \"true\" },\n signal: request.signal,\n };\n\n // For form submissions (actions), forward the body\n if (request.method !== \"GET\") {\n fetchInit.body = await request.formData();\n }\n\n const res = await fetch(request.url, fetchInit);\n const json = await res.json();\n\n // Handle redirects from actions\n if (json.redirect) {\n const results: Record = {};\n for (const match of matchesToLoad) {\n results[match.route.id] = { type: \"data\", result: redirect(json.redirect) };\n }\n return results;\n }\n\n // Map loader/action data back to route IDs\n const results: Record = {};\n for (const match of matchesToLoad) {\n const routeId = match.route.id;\n if (json.actionData?.[routeId] != null) {\n results[routeId] = { type: \"data\", result: json.actionData[routeId] };\n } else if (json.loaderData?.[routeId] !== undefined) {\n results[routeId] = { type: \"data\", result: json.loaderData[routeId] };\n }\n }\n\n return results;\n },\n },\n);\n\n// Hydrate the server-rendered HTML\nhydrateRoot(\n document.getElementById(\"root\")!,\n \n \n ,\n);\n",[],[194,200],"631ade1a-0f87-11f1-8b77-42dde27851f2",26,["D",1771720958278],"\n\n \n \n \n Todo List\n \n \n \n \n \n

\n \n \n\n",[],[194,206],"bbd9c8ae-0f87-11f1-8f72-42dde27851f2","019c82ce-a6e0-774f-9873-6da360d5b3ee",["D",1771721107172],[],[194,212],["D",1771720891213],[406,407,408],[194],"61306e6c-0f87-11f1-bedc-42dde27851f2",25,["D",1771720954967],"import { Hono } from \"https://esm.sh/hono@4.1.0\";\nimport { renderToString } from \"https://esm.sh/react-dom@18.2.0/server\";\nimport {\n createStaticHandler,\n createStaticRouter,\n StaticRouterProvider,\n} from \"https://esm.sh/react-router@7.5.0?deps=react@18.2.0,react-dom@18.2.0\";\nimport React from \"https://esm.sh/react@18.2.0\";\nimport { readFile, serveFile } from \"https://esm.town/v/std/utils@85-main/index.ts\";\nimport { routes } from \"../shared/routes.ts\";\nimport { initializeDatabase } from \"./database.ts\";\n\n// Initialize the database\nawait initializeDatabase();\n\n// Create the Hono app\nconst app = new Hono();\n\n// Serve static files (frontend, shared, routes — needed for client-side imports)\napp.get(\"/frontend/*\", (c) => serveFile(c.req.path, import.meta.url));\napp.get(\"/shared/*\", (c) => serveFile(c.req.path, import.meta.url));\napp.get(\"/routes/*\", (c) => serveFile(c.req.path, import.meta.url));\napp.get(\"/backend/*\", (c) => serveFile(c.req.path, import.meta.url));\n\n// Create a static handler for server-side rendering\nconst { query, dataRoutes } = createStaticHandler(routes);\n\n// Handle all routes with React Router\napp.all(\"*\", async (c) => {\n const isDataRequest = c.req.header(\"X-Data-Request\") === \"true\";\n\n // Run loaders/actions on the server\n const context = await query(c.req.raw);\n\n // If the context is a Response (e.g., redirect from an action)\n if (context instanceof Response) {\n if (isDataRequest && context.status >= 300 && context.status < 400) {\n return Response.json({ redirect: context.headers.get(\"Location\") });\n }\n return context;\n }\n\n // Data-only request: return loader/action data as JSON\n if (isDataRequest) {\n return Response.json({\n loaderData: context.loaderData,\n actionData: context.actionData,\n });\n }\n\n // Full SSR render\n const router = createStaticRouter(dataRoutes, context);\n let html = await readFile(\"/frontend/index.html\", import.meta.url);\n\n const appHtml = renderToString(\n React.createElement(StaticRouterProvider, { router, context }),\n );\n\n html = html.replace(\n '

',\n `

${appHtml}

`,\n );\n\n return c.html(html);\n});\n\napp.onError((err, c) => {\n throw err;\n});\n\nexport default app.fetch;\n",[],[253,259],"4a20e652-0f87-11f1-8f72-42dde27851f2","database.ts","4a20e742-0f87-11f1-8f72-42dde27851f2",20,["D",1771720916380],"import { sqlite } from \"https://esm.town/v/std/sqlite@14-main/main.ts\";\n\nconst TABLE = \"todos_v1\";\n\nexport interface Todo {\n id: number;\n text: string;\n done: number; // 0 or 1 (SQLite has no booleans)\n}\n\nexport async function initializeDatabase() {\n await sqlite.execute(`\n CREATE TABLE IF NOT EXISTS ${TABLE} (\n id INTEGER PRIMARY KEY AUTOINCREMENT,\n text TEXT NOT NULL,\n done INTEGER NOT NULL DEFAULT 0\n )\n `);\n}\n\nexport async function getAllTodos(): Promise {\n const result = await sqlite.execute(`SELECT * FROM ${TABLE} ORDER BY id DESC`);\n return result.rows as Todo[];\n}\n\nexport async function addTodo(text: string): Promise {\n await sqlite.execute({ sql: `INSERT INTO ${TABLE} (text) VALUES (?)`, args: [text] });\n}\n\nexport async function toggleTodo(id: number): Promise {\n await sqlite.execute({ sql: `UPDATE ${TABLE} SET done = 1 - done WHERE id = ?`, args: [id] });\n}\n",[],[253,479],"bbd9bfb2-0f87-11f1-8f72-42dde27851f2","019c82ce-a6e0-774f-9873-6966bc8c8a5b",["D",1771721107172],[],[253,266],["D",1771720891213],[402,403,404],[253],["D",1771720710965],["D",1789531852468],{"_11":12,"_331":102},{"_11":12,"_327":-5,"_101":102,"_25":100,"_328":329,"_330":24},{"_33":317,"_13":16,"_27":30,"_318":279,"_319":91,"_320":321,"_322":283,"_323":279,"_324":35,"_325":14,"_326":12},"ctx",{"_45":-5,"_353":532,"_533":534,"_535":536,"_537":24,"_538":24,"_539":24,"_540":291,"_541":-5,"_542":-7,"_543":-7,"_544":276,"_545":24,"_546":24,"_547":-5,"_548":24,"_549":24,"_550":24,"_551":-5},"ENV",{"_503":504,"_505":506,"_507":92,"_508":509,"_510":511,"_512":513,"_514":515,"_516":517,"_518":519,"_520":521,"_522":523,"_524":525,"_526":527,"_528":529,"_530":531},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","811aa22498c9b0b5a47e8d778de579cdb990f332","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

History