`, 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",{"_290":291,"_292":293},"routes/_app.x.$handle.$name",{"_110":109,"_38":51,"_119":96,"_33":120,"_13":14,"_121":-5,"_11":122,"_123":124,"_125":126,"_127":128,"_129":130,"_26":-5,"_131":132,"_133":134,"_135":31,"_136":137,"_138":65,"_139":-5,"_140":-5,"_141":142},"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":31,"_55":56,"_57":56,"_58":59,"_60":61,"_19":62,"_63":37,"_64":65,"_66":-5,"_67":-5,"_68":69,"_70":71,"_72":73,"_74":75,"_76":77,"_78":-5,"_79":80,"_81":80,"_82":83,"_84":83,"_85":83,"_86":80,"_87":80,"_88":89,"_90":91,"_92":93,"_94":31},"version",4,"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":34,"_39":40,"_41":43,"_44":45,"_46":14,"_47":48,"_30":31},"previous",{"_36":37,"_38":34,"_39":40,"_41":42},"deleted",false,"deletedHere","path","index.ts","latestPath","fileId","019fb420-d818-709a-afff-7e3dbf7ba471","name","fileType","http","content","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","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","createdAt",["D",1785433764395],"branchVersion","branchId","87ce50ca-5472-444e-945e-690530940ee4","id","03a28847-294c-481b-b348-8b906ee4d902","stack-detector",["D",1785433479102],"deletedAt","legacyEnvVars","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","pinPreview",true,"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",{"_110":109,"_118":114},"org",{"_110":109,"_111":112,"_113":114,"_19":62,"_115":116,"_117":31},"branch",{"_13":95,"_38":96,"_49":48,"_97":50,"_98":99,"_100":101,"_102":56,"_103":104,"_105":106,"_107":51,"_108":109},"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":285,"_53":-5,"_54":31,"_55":56,"_57":56,"_58":59,"_60":61,"_19":62,"_63":37,"_64":65,"_66":-5,"_67":-5,"_68":69,"_70":71,"_72":73,"_74":75,"_76":286,"_78":-5,"_79":80,"_81":80,"_82":83,"_84":83,"_85":83,"_86":80,"_87":80,"_88":287,"_90":288,"_92":289,"_94":31},"tree",[199,206,209,210,211],"files",[199,200,201,202,203,204,205,206,207,208,209,210,211],"counts",{"_189":69,"_190":162,"_191":69,"_192":193,"_194":195},"contents",[153,154,155,156,157],"upstreamProject",{"_49":104,"_38":149,"_58":150,"_60":61,"_55":56,"_88":151},"upstreamBranch",{"_49":99,"_44":143,"_144":145,"_38":96,"_97":104,"_13":101,"_98":-5,"_100":-5,"_146":147,"_53":-5,"_94":31,"_55":56,"_108":148,"_70":106,"_107":149},"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",{"_110":148,"_118":152},"https://imagedelivery.net/iHX6Ovru0O7AjmyT5yZRoA/129cab32-3bd7-4c3e-f39b-f12900c76100/square512?exp=1789534799&sig=94d49ad984a50880ef894a3794e08842e7b9b626be771ff48da114d7d9a149ed",{"_49":184,"_38":185,"_36":186,"_159":-5,"_47":48,"_46":162,"_160":65,"_44":187,"_13":69,"_39":182,"_41":-5,"_30":31,"_163":-5,"_33":188},{"_49":177,"_38":178,"_36":179,"_159":-5,"_47":48,"_46":180,"_160":65,"_44":181,"_13":69,"_39":182,"_41":-5,"_30":31,"_163":-5,"_33":183},{"_49":171,"_38":172,"_36":173,"_159":-5,"_47":48,"_46":162,"_160":65,"_44":174,"_13":69,"_39":26,"_41":175,"_30":31,"_163":-5,"_33":176},{"_49":165,"_38":166,"_36":167,"_159":-5,"_47":48,"_46":162,"_160":65,"_44":168,"_13":69,"_39":26,"_41":169,"_30":31,"_163":-5,"_33":170},{"_49":158,"_38":34,"_36":37,"_159":-5,"_47":48,"_46":14,"_160":65,"_44":161,"_13":162,"_39":40,"_41":43,"_30":31,"_163":-5,"_33":164},"082894b4-4a56-4c5b-99f8-dfac84086363","parentId","latest",["D",1785433764395],1,"label",[34],"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",[166],"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

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