`, 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",{"_306":307,"_308":309},"routes/_app.x.$handle.$name",{"_111":110,"_38":51,"_120":97,"_33":121,"_13":14,"_122":-5,"_11":123,"_124":125,"_126":127,"_128":129,"_130":131,"_26":-5,"_132":133,"_134":135,"_136":55,"_137":138,"_139":31,"_140":-5,"_141":-5,"_142":143},"routes/_app.x.$handle.$name.branch.$branch.version.$version.diff",{"_11":12,"_13":14,"_15":16,"_17":18,"_19":-5},"project",{"_49":50,"_38":51,"_44":52,"_53":-5,"_54":55,"_56":57,"_58":57,"_59":60,"_61":62,"_19":63,"_64":65,"_66":31,"_67":-5,"_68":-5,"_69":70,"_71":72,"_73":74,"_75":76,"_77":78,"_79":-5,"_80":81,"_82":81,"_83":84,"_85":84,"_86":84,"_87":81,"_88":81,"_89":90,"_91":92,"_93":94,"_95":55},"version",9,"changes",[25],"aiChatInfo",{"_20":21,"_22":-5,"_23":-5,"_24":-5},"userId","aiChatMessageId","982e1cce-4935-4162-8e3d-be4fd6497f7c","aiChatThreadId","aiChatThreadUserId","aiChatThreadTitle",{"_26":27,"_28":29,"_30":31,"_32":31,"_33":34,"_35":34},"file",{"_36":37,"_38":39,"_40":41,"_42":43,"_44":45,"_46":14,"_47":48,"_30":31},"previous",{"_36":37,"_38":39,"_40":41,"_42":43},"deleted",true,"deletedHere","path","frontend/components/Counter.tsx","latestPath","fileId","019fb420-d818-709a-afff-5fb9b039ca0f","name","Counter.tsx","fileType","script","content","/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport { useState } from \"https://esm.sh/react@18.2.0\";\n\nexport function Counter() {\n const [count, setCount] = useState(0);\n return (\n

\n Clicked\n setCount((c) => c + 1)}\n class=\"bg-blue-500 hover:bg-blue-600 text-white font-medium px-4 py-2 rounded-lg transition-colors cursor-pointer\"\n >\n {count}\n \n times\n

\n );\n}\n","createdAt",["D",1785433801051],"branchVersion","branchId","87ce50ca-5472-444e-945e-690530940ee4","id","03a28847-294c-481b-b348-8b906ee4d902","stack-detector",["D",1785433479102],"deletedAt","legacyEnvVars",false,"privacy","public","httpPrivacy","description","Detect website tech stacks - frameworks, analytics, CDN, hosting","imageUrl","https://imagedelivery.net/iHX6Ovru0O7AjmyT5yZRoA/64dc00cc-94d9-47dd-81b1-dde02610d900/square512?exp=1789534799&sig=2fe932419d898cd124d0961cab25a5a9c3bd76c8b30cb3b9e71257c7b34e60a2","0abad9ee-d048-4efb-9e4e-ec9274b0446a","pinnedFileId","019fb420-d818-709a-afff-7e3dbf7ba471","pinPreview","pinMigrated","screenshotVersion","likeCount",0,"orgId","019fb37d-3c9c-769b-82b0-aea437077e72","tursoName","03a28847294c481bb3488b906ee4d902","tursoHostname","03a28847294c481bb3488b906ee4d902-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789476033740],"pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_111":110,"_119":115},"org",{"_111":110,"_112":113,"_114":115,"_19":63,"_116":117,"_118":55},"branch",{"_13":96,"_38":97,"_49":48,"_98":50,"_99":100,"_101":102,"_103":57,"_104":105,"_106":107,"_108":51,"_109":110},"isOwned",18,"main","projectId","forkedBranchId","961078ea-f528-11ef-aa68-569c3dd06744","forkedBranchVersion",91,"forkedProjectPrivacy","forkedProjectId","96102714-f528-11ef-aa68-569c3dd06744","forkedProjectOrgId","019aa807-52c2-709c-928b-2029bae9a558","projectName","userHandle","alivealive","handle","displayName","Lars","avatar","https://lh3.googleusercontent.com/a/ACg8ocLgnpezRWvQt5J1zfAkq0FkaCQYFt5PgtjFEFDbziPynqZ_Pbif=s96-c","tier","free","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_49":50,"_38":51,"_44":301,"_53":-5,"_54":55,"_56":57,"_58":57,"_59":60,"_61":62,"_19":63,"_64":65,"_66":31,"_67":-5,"_68":-5,"_69":70,"_71":72,"_73":74,"_75":76,"_77":302,"_79":-5,"_80":81,"_82":81,"_83":84,"_85":84,"_86":84,"_87":81,"_88":81,"_89":303,"_91":304,"_93":305,"_95":55},"tree",[204,212,215,216,217],"files",[204,205,206,207,208,209,210,211,212,213,214,215,216,217],"counts",{"_194":70,"_195":165,"_196":70,"_197":198,"_199":200},"contents",[154,155,156,157,158],"upstreamProject",{"_49":105,"_38":150,"_59":151,"_61":62,"_56":57,"_89":152},"upstreamBranch",{"_49":100,"_44":144,"_145":146,"_38":97,"_98":105,"_13":102,"_99":-5,"_101":-5,"_147":148,"_53":-5,"_95":55,"_56":57,"_109":149,"_71":107,"_108":150},"emptyEnvVars","flags",[],"hasHttpFiles","grants","orgs","customDomains",{},["D",1740674013689],"updatedAt",["D",1785420707976],"lockfileKey","1785420708123-esm.town_v_templates_react-hono-starter@91-main","templates","react-hono-starter","Starter template with client-side React & Hono server",{"_111":149,"_119":153},"https://imagedelivery.net/iHX6Ovru0O7AjmyT5yZRoA/129cab32-3bd7-4c3e-f39b-f12900c76100/square512?exp=1789534799&sig=94d49ad984a50880ef894a3794e08842e7b9b626be771ff48da114d7d9a149ed",{"_49":189,"_38":190,"_36":191,"_161":-5,"_47":48,"_46":165,"_163":31,"_44":192,"_13":70,"_40":187,"_42":-5,"_30":55,"_168":-5,"_33":193},{"_49":182,"_38":183,"_36":184,"_161":-5,"_47":48,"_46":185,"_163":31,"_44":186,"_13":70,"_40":187,"_42":-5,"_30":55,"_168":-5,"_33":188},{"_49":176,"_38":177,"_36":178,"_161":-5,"_47":48,"_46":165,"_163":31,"_44":179,"_13":70,"_40":26,"_42":180,"_30":55,"_168":-5,"_33":181},{"_49":170,"_38":171,"_36":172,"_161":-5,"_47":48,"_46":165,"_163":31,"_44":173,"_13":70,"_40":26,"_42":174,"_30":55,"_168":-5,"_33":175},{"_49":159,"_38":160,"_36":65,"_161":-5,"_47":48,"_46":162,"_163":31,"_44":164,"_13":165,"_40":166,"_42":167,"_30":55,"_168":-5,"_33":169},"082894b4-4a56-4c5b-99f8-dfac84086363","index.ts","parentId",4,"latest",["D",1785433764395],1,"http","import { parseVal, serveImmutableFile } from \"https://esm.town/v/std/utils/index.ts\";\nimport { Hono } from \"npm:hono\";\nimport { Root } from \"./frontend/root.tsx\";\nimport { detectTechnologies } from \"./lib/detector.ts\";\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// API: Detect tech stack for a given URL\napp.get(\"/api/detect\", async (c) => {\n const url = c.req.query(\"url\");\n if (!url) {\n return c.json({ error: \"Missing 'url' query parameter\" }, 400);\n }\n const result = await detectTechnologies(url);\n return c.json(result);\n});\n\n// Unwrap and rethrow Hono errors as the original error\napp.onError((err) => Promise.reject(err));\n\n// HTTP vals expect an exported \"fetch handler\"\nexport default app.fetch;\n","label",[160],"6096dfda-0ef0-4ad6-aa32-8508aa99a8d3","README.md","019fb420-d818-709a-afff-7bb2590d78b9",["D",1785433479102],"# 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",[171],"994828a4-0da0-4182-b7bb-72a8cff3d24c","CHANGELOG.md","019fb420-d818-709a-afff-76670563f1f9",["D",1785433479102],"# 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 · v9