[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8,"_9":10},"actionData","errors","root",{"_294":295,"_296":297},"routes/_app.x.$handle.$name",{"_102":101,"_32":44,"_110":89,"_27":111,"_13":14,"_112":-5,"_11":113,"_114":115,"_116":117,"_118":119,"_120":121,"_20":-5,"_122":123,"_124":125,"_126":25,"_127":128,"_129":58,"_130":-5,"_131":-5,"_132":133},"routes/_app.x.$handle.$name.branch.$branch.version.$version.diff",{"_11":12,"_13":14,"_15":16,"_17":-5,"_18":-5},"project",{"_42":43,"_32":44,"_37":45,"_46":-5,"_47":25,"_48":49,"_50":49,"_51":52,"_53":-5,"_18":54,"_55":56,"_57":58,"_59":-5,"_60":-5,"_61":62,"_63":64,"_65":66,"_67":68,"_69":70,"_71":-5,"_72":73,"_74":73,"_75":76,"_77":76,"_78":76,"_79":73,"_80":73,"_81":82,"_83":84,"_85":86,"_87":25},"version",8,"changes",[19],"aiChatInfo","userId",{"_20":21,"_22":23,"_24":25,"_26":25,"_27":28,"_29":28},"file",{"_30":31,"_32":28,"_33":20,"_34":36,"_37":38,"_39":14,"_40":41,"_24":25},"previous",{"_30":31,"_32":28,"_33":20,"_34":35},"deleted",false,"deletedHere","path","README.md","latestPath","fileId","019c82c8-9b9f-71cf-9c7c-38fa193b361b","name","fileType","content","# React Router 7 on Val Town — Minimal Example\n\nThe simplest possible full-stack SSR + SPA app on [Val Town](https://val.town), built with **React Router 7**, **Hono**, and **SQLite**. A todo list in ~150 lines of app code that demonstrates every core pattern you need.\n\n> **Want the full version?** See the [message board example](https://www.val.town/x/stevekrouse/reactRouter7Example) with nested routes, search, multiple tables, and more.\n\n## What This Teaches\n\n1. **SSR + Hydration** — Server renders full HTML, client hydrates with `hydrateRoot`\n2. **Shared route tree** — Same `routes.ts` on server and client; `serverLoader`/`serverAction` keeps DB code off the client\n3. **Single-fetch `dataStrategy`** — One request per navigation via `X-Data-Request` header\n4. **Loaders** — Server-side data loading before render\n5. **Actions** — Form submissions via `

` 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","# React Router 7 on Val Town — Minimal Example\n\nThe simplest possible full-stack SSR + SPA app on [Val Town](https://val.town),\nbuilt with **React Router 7**, **Hono**, and **SQLite**. A todo list in ~150\nlines of app code that demonstrates every core pattern you need.\n\n> **Want the full version?** See the\n> [message board example](https://www.val.town/x/stevekrouse/reactRouter7Example)\n> with nested routes, search, multiple tables, and more.\n\n## What This Teaches\n\n1. **SSR + Hydration** — Server renders full HTML, client hydrates with\n `hydrateRoot`\n2. **Shared route tree** — Same `routes.ts` on server and client;\n `serverLoader`/`serverAction` keeps DB code off the client\n3. **Single-fetch `dataStrategy`** — One request per navigation via\n `X-Data-Request` header\n4. **Loaders** — Server-side data loading before render\n5. **Actions** — Form submissions via `` with `intent`\n 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\nhelpers 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\nbrowser**.\n\n### Key Pattern: `dataStrategy` (Single-Fetch)\n\nInstead of React Router calling each loader individually on the client, a custom\n`dataStrategy` in `frontend/index.tsx` makes **one HTTP request** with an\n`X-Data-Request: true` header. The server runs all matched loaders/actions and\nreturns 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`) |\n| Runtime | Val Town (Deno) |","createdAt",["D",1771761364351],"branchVersion","branchId","cfbc9000-0f86-11f1-9fc4-42dde27851f2","id","cfb5d724-0f86-11f1-9fc4-42dde27851f2","reactRouter7MinimalExample",["D",1771720710965],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","Full-stack example ReactRouter7 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{\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\nconst 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];",[],[155,206],["D",1771720710965],[199],[155],"caa29154-0f87-11f1-9965-42dde27851f2","Home.tsx","019c82c8-9b9f-71cf-9c7c-0b560a296e73",["D",1771721131961],"/** @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",[],[162,218],"caa28e70-0f87-11f1-9965-42dde27851f2","Home.loader.ts","019c82c8-9b9f-71cf-9c7c-04590b996403",["D",1771721131961],"import { getAllTodos } from \"../backend/database.ts\";\n\nexport async function loader() {\n return { todos: await getAllTodos() };\n}\n",[],[162,225],"caa20af4-0f87-11f1-9965-42dde27851f2","Home.action.ts","caa20b80-0f87-11f1-9965-42dde27851f2",["D",1771721131961],"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",[],[162,232],["D",1771720710965],[195,196,197],[162],"caa27c50-0f87-11f1-9965-42dde27851f2","index.tsx","019c82c8-9b9f-71cf-9c7b-fa99b68ed4b6",["D",1771721131961],"/** @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",[],[167,242],"caa2770a-0f87-11f1-9965-42dde27851f2","index.html","019c82c8-9b9f-71cf-9c7b-f521acec0290",["D",1771721131961],"\n\n \n \n \n Todo List\n \n \n \n \n \n

\n \n \n\n",[],[167,249],"cfc33e96-0f86-11f1-9fc4-42dde27851f2","components","019c82c8-9b9f-71cf-9c7b-f1f1eaa5d913",["D",1771720710965],[],[167,256],["D",1771720710965],[191,192,193],[167],"2c4b5474-0fe5-11f1-bd9e-42dde27851f2","index.ts",5,["D",1771761239006],"http","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/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((e) => Promise.reject(e));\n\nexport default app.fetch;",[],[172,265],"3af94f9e-0fe5-11f1-ae77-42dde27851f2","database.ts","caa1e966-0f87-11f1-9965-42dde27851f2",7,["D",1771761263634],"import { sqlite } from \"https://esm.town/v/std/sqlite/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(\n `SELECT * FROM ${TABLE} ORDER BY id DESC`,\n );\n return result.rows as unknown as Todo[];\n}\n\nexport async function addTodo(text: string): Promise {\n await sqlite.execute({\n sql: `INSERT INTO ${TABLE} (text) VALUES (?)`,\n args: [text],\n });\n}\n\nexport async function toggleTodo(id: number): Promise {\n await sqlite.execute({\n sql: `UPDATE ${TABLE} SET done = 1 - done WHERE id = ?`,\n args: [id],\n });\n}",[],[172,273],"cfc2f0bc-0f86-11f1-9fc4-42dde27851f2","database","019c82c8-9b9f-71cf-9c7b-cea6edb6ef75",["D",1771720710965],[],[172,281],["D",1771720710965],[187,188,189],[172],["D",1771720710965],["D",1789444861734],{"_102":101,"_109":105},{"_102":101,"_103":-5,"_104":105,"_18":54,"_106":107,"_108":25},{"_13":88,"_32":89,"_42":41,"_90":43,"_91":92,"_93":94,"_95":49,"_96":97,"_98":64,"_99":44,"_100":101},"ctx",{"_81":-5,"_131":327,"_328":329,"_330":331,"_332":25,"_333":25,"_334":25,"_335":58,"_336":-5,"_337":-7,"_338":-7,"_339":62,"_340":25,"_341":25,"_342":-5,"_343":25,"_344":25,"_345":25,"_346":-5},"ENV",{"_298":299,"_300":301,"_302":89,"_303":304,"_305":306,"_307":308,"_309":310,"_311":312,"_313":314,"_315":316,"_317":318,"_319":320,"_321":322,"_323":324,"_325":326},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","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"]

Diff · v8