`, favicon, and body of `Root()` to\nmatch your app's existing `index.html`, and stamp anything else your shell\nreferences directly (images, css) with `immutableFileUrl()`.\n\n1. Create `frontend/root.tsx`:\n\n```tsx\n/** @jsxImportSource npm:hono@4/jsx */\nimport { raw } from \"npm:hono@4/html\";\nimport { immutableFileUrl } from \"https://esm.town/v/std/utils/index.ts\";\n\n// The HTML shell for the app. It is never cached, so immutableFileUrl can stamp\n// the current val version into each asset URL — the browser caches those\n// immutably, and publishing the val changes the URLs, refetching exactly once.\nexport function Root() {\n return (\n <>\n {raw(\"<!DOCTYPE html>\")}\n <html lang=\"en\">\n <head>\n <meta charSet=\"UTF-8\" />\n <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\" />\n <title>React Hono Val Town Starter

[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8,"_9":10},"actionData","errors","root",{"_258":259,"_260":261},"routes/_app.x.$handle.$name",{"_105":104,"_32":50,"_113":95,"_27":114,"_13":14,"_115":-5,"_11":116,"_117":118,"_119":120,"_121":122,"_123":124,"_21":-5,"_125":-5,"_126":-5,"_127":25,"_128":129,"_130":64,"_131":-5,"_132":-5,"_133":134},"routes/_app.x.$handle.$name.branch.$branch.version.$version.diff",{"_11":12,"_13":14,"_15":16,"_17":-5,"_18":-5},"project",{"_48":49,"_32":50,"_38":51,"_52":-5,"_53":25,"_54":55,"_56":55,"_57":58,"_59":-5,"_18":60,"_61":62,"_63":64,"_65":-5,"_66":-5,"_67":68,"_69":70,"_71":72,"_73":74,"_75":76,"_77":-5,"_78":79,"_80":79,"_81":82,"_83":82,"_84":82,"_85":79,"_86":79,"_87":88,"_89":90,"_91":92,"_93":25},"version",2,"changes",[19,20],"aiChatInfo","userId",{"_21":43,"_23":-7,"_24":25,"_26":25,"_27":44,"_29":44},{"_21":22,"_23":-7,"_24":25,"_26":25,"_27":28,"_29":28},"file",{"_30":31,"_32":33,"_34":35,"_36":37,"_38":39,"_40":14,"_41":42,"_24":25},"previous","deleted",false,"deletedHere","path","backend/auth.ts","latestPath","fileId","4a7b9674-9df8-11f1-9b87-1607ee4eb77e","name","auth.ts","fileType","script","content","const COOKIE = \"cursor_chat_auth\";\n\nexport function isConfigured() {\n return Boolean(Deno.env.get(\"CURSOR_API_KEY\") && Deno.env.get(\"APP_PASSWORD\"));\n}\n\nasync function tokenFromPassword(password: string) {\n const bytes = new TextEncoder().encode(password);\n const hash = await crypto.subtle.digest(\"SHA-256\", bytes);\n return [...new Uint8Array(hash)]\n .map((b) => b.toString(16).padStart(2, \"0\"))\n .join(\"\");\n}\n\nexport async function expectedToken() {\n const password = Deno.env.get(\"APP_PASSWORD\");\n if (!password) return null;\n return await tokenFromPassword(password);\n}\n\nfunction cookieMap(req: Request) {\n const raw = req.headers.get(\"Cookie\") ?? \"\";\n const out = new Map();\n for (const part of raw.split(\";\")) {\n const [k, ...rest] = part.trim().split(\"=\");\n if (k) out.set(k, rest.join(\"=\"));\n }\n return out;\n}\n\nexport async function isAuthed(req: Request) {\n const expected = await expectedToken();\n if (!expected) return false;\n return cookieMap(req).get(COOKIE) === expected;\n}\n\nexport async function loginCookie(password: string) {\n const expected = await expectedToken();\n if (!expected) return null;\n const got = await tokenFromPassword(password);\n if (got !== expected) return null;\n return `${COOKIE}=${got}; Path=/; HttpOnly; SameSite=Lax; Max-Age=2592000`;\n}\n\nexport function logoutCookie() {\n return `${COOKIE}=; Path=/; HttpOnly; SameSite=Lax; Max-Age=0`;\n}\n","createdAt",["D",1787382515211],"branchVersion","branchId","6924747a-bd7f-44f6-8ed7-64b4b4bc8bc0",{"_30":45,"_32":44,"_34":46,"_36":-5,"_38":47,"_40":14,"_41":42,"_24":25},"backend","31afd5aa-a5c9-4b98-9074-04ce71c64532","directory",["D",1787382515211],"id","97ce4900-8329-43bb-b758-880f88637a91","cursor-chat",["D",1787382471418],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","Mobile chat relay to Cursor + Val Town","imageUrl","96c2793d-57c8-41d2-a49a-d1ee82f9dd24","pinnedFileId","01a0284c-1b46-711a-b263-211c80180a34","pinPreview",true,"pinMigrated","screenshotVersion","likeCount",0,"orgId","93515af8-c7b7-459c-9bf2-3bb3df310a75","tursoName","97ce4900832943bbb758880f88637a91","tursoHostname","97ce4900832943bbb758880f88637a91-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789474853273],"pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_105":104,"_112":108},"org",{"_105":104,"_106":-5,"_107":108,"_18":60,"_109":110,"_111":25},"branch",{"_13":94,"_32":95,"_48":42,"_96":49,"_97":-5,"_98":-5,"_99":-5,"_100":-5,"_101":-5,"_102":50,"_103":104},"isOwned",376,"main","projectId","forkedBranchId","forkedBranchVersion","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","projectName","userHandle","yuxiaoy","handle","displayName","avatar","https://img.clerk.com/eyJ0eXBlIjoiZGVmYXVsdCIsImlpZCI6Imluc18yTm10cGhQUklwU0tqZHNiOHNnNGd2ZjJURFUiLCJyaWQiOiJ1c2VyXzJObXd1QWdCZmVtaUh0bGU5TkswOG1sM0xheiIsImluaXRpYWxzIjoiRlkifQ","tier","free","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_48":49,"_32":50,"_38":253,"_52":-5,"_53":25,"_54":55,"_56":55,"_57":58,"_59":-5,"_18":60,"_61":62,"_63":64,"_65":-5,"_66":-5,"_67":68,"_69":70,"_71":72,"_73":74,"_75":254,"_77":-5,"_78":79,"_80":79,"_81":82,"_83":82,"_84":82,"_85":79,"_86":79,"_87":255,"_89":256,"_91":257,"_93":25},"tree",[180,182,189,190,191],"files",[180,181,182,183,184,185,186,187,188,189,190,191],"counts",{"_170":68,"_171":143,"_172":68,"_173":174,"_175":176},"contents",[135,136,137,138,139],"upstreamProject","upstreamBranch","emptyEnvVars","flags",[],"hasHttpFiles","grants","orgs","customDomains",{},{"_48":167,"_32":44,"_30":45,"_142":-5,"_41":42,"_40":14,"_144":64,"_38":168,"_13":68,"_34":46,"_36":-5,"_24":25,"_148":-5,"_27":169},{"_48":162,"_32":163,"_30":164,"_142":-5,"_41":42,"_40":143,"_144":64,"_38":165,"_13":68,"_34":46,"_36":-5,"_24":25,"_148":-5,"_27":166},{"_48":156,"_32":157,"_30":158,"_142":-5,"_41":42,"_40":143,"_144":25,"_38":159,"_13":68,"_34":21,"_36":160,"_24":25,"_148":-5,"_27":161},{"_48":150,"_32":151,"_30":152,"_142":-5,"_41":42,"_40":143,"_144":25,"_38":153,"_13":68,"_34":21,"_36":154,"_24":25,"_148":-5,"_27":155},{"_48":140,"_32":141,"_30":62,"_142":-5,"_41":42,"_40":143,"_144":25,"_38":145,"_13":68,"_34":146,"_36":147,"_24":25,"_148":-5,"_27":149},"7c60651a-d545-4903-b0b1-82e3856498dd","index.ts","parentId",1,"latest",["D",1787382471418],"http","import { parseVal, serveImmutableFile } from \"https://esm.town/v/std/utils/index.ts\";\nimport { Hono } from \"npm:hono\";\nimport { Root } from \"./frontend/root.tsx\";\n\nconst app = new Hono();\n\n// Serve the (never-cached) HTML shell at the root /\napp.get(\"/\", (c) => c.html(Root()));\n\n// Serve frontend files at the version-addressed URLs Root() stamps, cached immutably\napp.get(\"/__immutable/*\", (c) => serveImmutableFile(c.req.path));\n\n// View source redirect\napp.get(\"/source\", (c) => c.redirect(parseVal().links.self.val));\n\n// Add your API routes here\n// app.get(\"/api/data\", c => c.json({ hello: \"world\" }));\n\n// Unwrap and rethrow Hono errors as the original error\n// If you delete this, all errors will be \"Internal Server Error\"\napp.onError((err) => Promise.reject(err));\n\n// HTTP vals expect an exported \"fetch handler\"\n// This is how you \"run the server\" in Val Town with Hono\nexport default app.fetch;\n","label",[141],"bec3edd4-de87-44e1-8d87-e30ed84d02f0","README.md","01a0284c-1b46-711a-b263-1e3f3ba9965c",["D",1787382471418],"# React + Hono Starter\n\nA minimal starter template for building client-side React apps with a Hono\nbackend on Val Town. Click **Remix** to get your own copy.\n\n## Picking a starter\n\n| Starter | When to pick it |\n| --- | --- |\n| [`basic-html-starter`](https://www.val.town/x/templates/basic-html-starter) | Static HTML pages. Sprinkle of vanilla JS. No server-side rendering. |\n| [`hono-jsx-starter`](https://www.val.town/x/templates/hono-jsx-starter) | Dynamic server-rendered HTML with JSX. API routes. No React, no SPA. |\n| **[`react-hono-starter`](https://www.val.town/x/templates/react-hono-starter)** *(you're here)* | Client-side React SPA with a Hono API backend. |\n\n**Want to build UI?** Start writing React components in\n[`frontend/components/`](/frontend/components/). Import them into `App.tsx` and\nyou're good to go. Styling is [Twind](https://twind.style/) — just use Tailwind\nutility classes, zero config.\n\n**Want to add an API?** Add routes in [`index.ts`](/index.ts) (there's a\ncommented-out example). Fetch them from your React components.\n\n## Architecture\n\n```mermaid\ngraph LR\n Browser -->|\"GET /\"| Hono[\"index.ts
(Hono server)\"]\n Hono -->|serves| HTML[\"root.tsx\"]\n HTML -->|loads| Entry[\"index.tsx\"]\n Entry -->|renders| App[\"App.tsx\"]\n App -->|renders| Counter[\"Counter.tsx\"]\n```\n\n## File structure\n\n```\nindex.ts ← Hono backend (serves frontend + API routes)\nfrontend/\n root.tsx ← HTML shell (stamps immutable asset URLs)\n index.tsx ← React entrypoint (mounts )\n favicon.svg ← App icon\n components/\n App.tsx ← Root component (layout + view source link)\n Counter.tsx ← Example component with state\n```\n\n## How it works\n\n1. **`index.ts`** is the HTTP entrypoint — a Hono server that serves the\n frontend and any API routes you add.\n2. **`frontend/root.tsx`** is the HTML shell — it loads Twind and stamps\n immutable asset URLs for the favicon and React entrypoint.\n3. **`frontend/index.tsx`** mounts the React app.\n4. **`frontend/components/App.tsx`** is the root layout — add new components\n alongside it.\n5. **`frontend/components/Counter.tsx`** is an example stateful component —\n replace it with your own!\n\n## Next steps\n\n- Add API routes in `index.ts`\n- Add new components in `frontend/components/`\n- Add a SQLite database — see the\n [React Hono Example](https://www.val.town/x/stevekrouse/reactHonoExample) for\n a full-stack example with database, queries, and shared types\n\nTemplate updates and upgrade paths for existing remixes: [CHANGELOG.md](/CHANGELOG.md)\n",[151],"b5d3d126-3f9f-4e76-9dd6-b57a2130ef32","CHANGELOG.md","01a0284c-1b46-711a-b263-184ef9e69f49",["D",1787382471418],"# Changelog\n\n## 2026-07-30 — Immutable asset caching\n\nFrontend files are now served at version-addressed URLs\n(`/__immutable/45/frontend/index.tsx`) with\n`Cache-Control: public, max-age=31536000, immutable`, so repeat visits load the\nwhole client graph from the browser cache — roughly 3× faster (~665ms → ~157ms\nmeasured). Publishing your val bumps its version, which changes every URL, so\ncaches invalidate automatically. Old-version URLs return 404 after a publish\n(like Next.js build assets); a reload picks up the new version.\n\nWhat changed in the template:\n\n- `frontend/index.html` → [`frontend/root.tsx`](/frontend/root.tsx): the HTML\n shell is now JSX and stamps asset URLs with `immutableFileUrl()`\n- [`index.ts`](/index.ts): serves `Root()` at `/`, and one\n `app.get(\"/__immutable/*\", (c) => serveImmutableFile(c.req.path))` route\n serves all frontend files\n\n### Upgrading an existing remix\n\nYour copy of this template doesn't update automatically. Two options:\n\n**Minimal (most of the benefit):** point both routes at `serveImmutableFile` —\nyour existing bare URLs redirect into versioned space, the new route serves\nthem, and the whole module graph gets cached (costs one redirect per page view):\n\n```ts\nimport { serveImmutableFile } from \"https://esm.town/v/std/utils/index.ts\";\n\napp.get(\"/__immutable/*\", (c) => serveImmutableFile(c.req.path));\napp.get(\"/frontend/**/*\", (c) => serveImmutableFile(c.req.path)); // was serveFile\n```\n\n**Full upgrade (also removes the redirect):** three self-contained steps —\nno other files needed. Adjust the ``, favicon, and body of `Root()` to\nmatch your app's existing `index.html`, and stamp anything else your shell\nreferences directly (images, css) with `immutableFileUrl()`.\n\n1. Create `frontend/root.tsx`:\n\n```tsx\n/** @jsxImportSource npm:hono@4/jsx */\nimport { raw } from \"npm:hono@4/html\";\nimport { immutableFileUrl } from \"https://esm.town/v/std/utils/index.ts\";\n\n// The HTML shell for the app. It is never cached, so immutableFileUrl can stamp\n// the current val version into each asset URL — the browser caches those\n// immutably, and publishing the val changes the URLs, refetching exactly once.\nexport function Root() {\n return (\n <>\n {raw(\"<!DOCTYPE html>\")}\n <html lang=\"en\">\n <head>\n <meta charSet=\"UTF-8\" />\n <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\" />\n <title>React Hono Val Town Starter\n

Diff · v2