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React + Hono Starter

\n \n

\n View source\n

\n );\n}\n","/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport { useEffect, useMemo, useState } from \"https://esm.sh/react@18.2.0\";\n\nconst clamp = (value: number) => Math.max(0, Math.min(59, Number.isFinite(value) ? Math.floor(value) : 0));\n\nfunction format(seconds: number) {\n const mins = Math.floor(seconds / 60);\n const secs = seconds % 60;\n return `${String(mins).padStart(2, \"0\")}:${String(secs).padStart(2, \"0\")}`;\n}\n\nexport function App() {\n const [minutes, setMinutes] = useState(5);\n const [seconds, setSeconds] = useState(0);\n const configuredSeconds = useMemo(() => Math.max(0, Math.floor(minutes) * 60 + seconds), [minutes, seconds]);\n const [remaining, setRemaining] = useState(configuredSeconds);\n const [running, setRunning] = useState(false);\n\n useEffect(() => {\n if (!running) setRemaining(configuredSeconds);\n }, [configuredSeconds, running]);\n\n useEffect(() => {\n if (!running || remaining <= 0) return;\n const tick = window.setInterval(() => {\n setRemaining((current) => {\n if (current <= 1) {\n setRunning(false);\n return 0;\n }\n return current - 1;\n });\n }, 1000);\n return () => window.clearInterval(tick);\n }, [running, remaining]);\n\n const setDuration = () => {\n setRunning(false);\n setRemaining(configuredSeconds);\n };\n\n const reset = () => {\n setRunning(false);\n setRemaining(configuredSeconds);\n };\n\n const start = () => {\n if (remaining > 0) setRunning(true);\n };\n\n return (\n

Browser timer

Stay on the clock.

Set a duration, then start, pause, or reset whenever you need.

\n\n

\n \n {format(remaining)}\n \n

{running ? \"Timer is running\" : remaining === 0 ? \"Time’s up\" : \"Ready when you are\"}

\n\n

\n \n Minutes\n setMinutes(Math.max(0, Math.min(999, Number(e.currentTarget.value) || 0)))}\n class=\"mt-2 w-full rounded-xl border border-slate-700 bg-slate-800 px-4 py-3 text-lg text-white outline-none focus:border-cyan-400 disabled:opacity-50\"\n />\n \n \n Seconds\n setSeconds(clamp(Number(e.currentTarget.value)))}\n class=\"mt-2 w-full rounded-xl border border-slate-700 bg-slate-800 px-4 py-3 text-lg text-white outline-none focus:border-cyan-400 disabled:opacity-50\"\n />\n \n

\n\n

\n \n \n \n

\n\n

View source

\n );\n}\n","createdAt",["D",1786997471523],"branchVersion","branchId","920a79fe-48b4-4664-94e6-db77366a90ac","id","3356aabb-0fdf-49e1-8fee-073da3641c5d","chatgpt-timer-test-aug17",["D",1786997435323],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","A browser timer with set, start, pause, and reset controls.","imageUrl","https://imagedelivery.net/iHX6Ovru0O7AjmyT5yZRoA/64dc00cc-94d9-47dd-81b1-dde02610d900/square512?exp=1789592399&sig=9f2b8198a6bd290c0e4cd558a371acaf6bae0541324daebbd1636993bd403dce","64a25dff-97c9-4036-a643-e4dc22e6015c","pinnedFileId","01a01158-ec56-752d-bb44-3f47d1dd692f","pinPreview",true,"pinMigrated","screenshotVersion","likeCount",0,"orgId","019ea8b5-62e4-71f9-94d1-1a9ae3f0ebe7","tursoName","3356aabb0fdf49e18fee073da3641c5d","tursoHostname","3356aabb0fdf49e18fee073da3641c5d-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789524079207],"pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_105":104,"_113":109},"org",{"_105":104,"_106":107,"_108":109,"_18":57,"_110":111,"_112":25},"branch",{"_13":14,"_32":91,"_44":43,"_92":45,"_93":94,"_95":96,"_97":51,"_98":99,"_100":101,"_102":46,"_103":104},"isOwned","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","callmepotluck","handle","displayName","Potluck Mittal","avatar","https://lh3.googleusercontent.com/a/ACg8ocJrC5mDbeIgKgav6s7-_mva1XAfWU7NJhGHTfS09GOohU9PsH8=s96-c","tier","free","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_44":45,"_32":46,"_39":252,"_48":-5,"_49":25,"_50":51,"_52":51,"_53":54,"_55":56,"_18":57,"_58":59,"_60":61,"_62":-5,"_63":-5,"_64":65,"_66":67,"_68":69,"_70":71,"_72":253,"_74":-5,"_75":76,"_77":76,"_78":79,"_80":79,"_81":79,"_82":76,"_83":76,"_84":254,"_86":255,"_88":256,"_90":25},"tree",[190,197,198,199],"files",[190,191,192,193,194,195,196,197,198,199],"counts",{"_180":65,"_181":155,"_182":65,"_183":184,"_185":186},"contents",[148,149,150,151],"upstreamProject",{"_44":99,"_32":144,"_53":145,"_55":56,"_50":51,"_84":146},"upstreamBranch",{"_44":94,"_39":138,"_139":140,"_32":91,"_92":99,"_13":96,"_93":-5,"_95":-5,"_141":142,"_48":-5,"_90":25,"_50":51,"_103":143,"_66":101,"_102":144},"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",{"_105":143,"_113":147},"https://imagedelivery.net/iHX6Ovru0O7AjmyT5yZRoA/129cab32-3bd7-4c3e-f39b-f12900c76100/square512?exp=1789592399&sig=e3667930a878fd5db49e47cce78fe270a8ba33317e34775a1ada2dd4a7c49d8d",{"_44":174,"_32":175,"_30":176,"_154":-5,"_42":43,"_41":155,"_156":61,"_39":177,"_13":65,"_34":178,"_36":-5,"_24":25,"_160":-5,"_27":179},{"_44":168,"_32":169,"_30":170,"_154":-5,"_42":43,"_41":155,"_156":61,"_39":171,"_13":65,"_34":20,"_36":172,"_24":25,"_160":-5,"_27":173},{"_44":162,"_32":163,"_30":164,"_154":-5,"_42":43,"_41":155,"_156":61,"_39":165,"_13":65,"_34":20,"_36":166,"_24":25,"_160":-5,"_27":167},{"_44":152,"_32":153,"_30":59,"_154":-5,"_42":43,"_41":155,"_156":61,"_39":157,"_13":65,"_34":158,"_36":159,"_24":25,"_160":-5,"_27":161},"6f478a48-7493-424e-b0ee-f16ad464d657","index.ts","parentId",1,"latest",["D",1786997435323],"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",[153],"607cb786-5380-4665-b670-9a171351ca83","README.md","01a01158-ec56-752d-bb44-3b18d0f1b63b",["D",1786997435323],"# 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",[163],"6bcbc223-865e-4f6f-ae07-cd73bb88b16a","CHANGELOG.md","01a01158-ec56-752d-bb44-34b323db373f",["D",1786997435323],"# 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 · v3