`, 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",{"_257":258,"_259":260},"routes/_app.x.$handle.$name",{"_107":106,"_38":52,"_115":97,"_33":116,"_13":14,"_117":-5,"_11":118,"_119":120,"_121":122,"_123":124,"_125":126,"_26":-5,"_127":-5,"_128":-5,"_129":31,"_130":131,"_132":66,"_133":-5,"_134":-5,"_135":136},"routes/_app.x.$handle.$name.branch.$branch.version.$version.diff",{"_11":12,"_13":14,"_15":16,"_17":18,"_19":-5},"project",{"_50":51,"_38":52,"_45":53,"_54":-5,"_55":31,"_56":57,"_58":57,"_59":60,"_61":-5,"_19":62,"_63":64,"_65":66,"_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":31},"version",7,"changes",[25],"aiChatInfo",{"_20":21,"_22":-5,"_23":-5,"_24":-5},"userId","aiChatMessageId","fda3539a-14c1-4e21-aaf4-fb8a6a50aa76","aiChatThreadId","aiChatThreadUserId","aiChatThreadTitle",{"_26":27,"_28":29,"_30":31,"_32":31,"_33":34,"_35":34},"file",{"_36":37,"_38":39,"_40":41,"_42":44,"_45":46,"_47":14,"_48":49,"_30":31},"previous",{"_36":37,"_38":39,"_40":41,"_42":43},"deleted",false,"deletedHere","path","frontend/components/Chat.tsx","latestPath","fileId","c93f6a72-b026-11f1-81e0-1607ee4eb77e","name","Chat.tsx","fileType","script","content","/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport { useEffect, useRef, useState } from \"https://esm.sh/react@18.2.0\";\n\ntype Message = { role: \"user\" | \"assistant\"; content: string };\n\nexport function Chat() {\n const [messages, setMessages] = useState([]);\n const [input, setInput] = useState(\"\");\n const [loading, setLoading] = useState(false);\n const endRef = useRef(null);\n\n useEffect(() => {\n endRef.current?.scrollIntoView({ behavior: \"smooth\" });\n }, [messages]);\n\n async function send() {\n const text = input.trim();\n if (!text || loading) return;\n setInput(\"\");\n setLoading(true);\n const history: Message[] = [...messages, { role: \"user\", content: text }];\n setMessages(history);\n setMessages((prev) => [...prev, { role: \"assistant\", content: \"\" }]);\n\n try {\n const res = await fetch(\"/api/chat\", {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/json\" },\n body: JSON.stringify({ messages: history }),\n });\n if (!res.ok) {\n const err = await res.json().catch(() => ({}));\n throw new Error(err.error || `Request failed (${res.status})`);\n }\n const reader = res.body!.getReader();\n const decoder = new TextDecoder();\n let buffer = \"\";\n while (true) {\n const { done, value } = await reader.read();\n if (done) break;\n buffer += decoder.decode(value, { stream: true });\n const lines = buffer.split(\"\\n\");\n buffer = lines.pop() ?? \"\";\n for (const line of lines) {\n if (!line.startsWith(\"data:\")) continue;\n const payload = line.slice(5).trim();\n if (payload === \"[DONE]\") continue;\n try {\n const json = JSON.parse(payload);\n if (json.delta) {\n setMessages((prev) => {\n const next = [...prev];\n const last = next[next.length - 1];\n next[next.length - 1] = {\n role: \"assistant\",\n content: last.content + json.delta,\n };\n return next;\n });\n }\n } catch {\n /* ignore partial lines */\n }\n }\n }\n } catch (err) {\n setMessages((prev) => {\n const next = [...prev];\n next[next.length - 1] = {\n role: \"assistant\",\n content: `⚠️ ${(err as Error).message}\\n\\nSet your OPENAI_API_KEY to make this work.`,\n };\n return next;\n });\n } finally {\n setLoading(false);\n }\n }\n\n return (\n

\n {messages.length === 0 && (\n

🤖

Chat with my assistant

Ask me anything — responses stream in live.

\n )}\n {messages.map((m, i) => (\n

\n \n {m.content}\n

\n ))}\n

\n\n {\n e.preventDefault();\n send();\n }}\n class=\"flex gap-2 pb-4\"\n >\n setInput(e.target.value)}\n placeholder={loading ? \"Assistant is thinking…\" : \"Type a message…\"}\n class=\"flex-1 px-4 py-3 border border-gray-300 rounded-xl focus:outline-none focus:ring-2 focus:ring-blue-400 disabled:bg-gray-50\"\n autoFocus\n />\n \n Send\n \n \n

\n );\n}\n","/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport { useEffect, useRef, useState } from \"https://esm.sh/react@18.2.0\";\n\ntype Message = { role: \"user\" | \"assistant\"; content: string };\n\nexport function Chat() {\n const [messages, setMessages] = useState([]);\n const [input, setInput] = useState(\"\");\n const [loading, setLoading] = useState(false);\n const endRef = useRef(null);\n\n useEffect(() => {\n endRef.current?.scrollIntoView({ behavior: \"smooth\" });\n }, [messages]);\n\n async function send() {\n const text = input.trim();\n if (!text || loading) return;\n setInput(\"\");\n setLoading(true);\n const history: Message[] = [...messages, { role: \"user\", content: text }];\n setMessages(history);\n setMessages((prev) => [...prev, { role: \"assistant\", content: \"\" }]);\n\n try {\n const res = await fetch(\"/api/chat\", {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/json\" },\n body: JSON.stringify({ messages: history }),\n });\n if (!res.ok) {\n const err = await res.json().catch(() => ({}));\n throw new Error(err.error || `Request failed (${res.status})`);\n }\n const reader = res.body!.getReader();\n const decoder = new TextDecoder();\n let buffer = \"\";\n while (true) {\n const { done, value } = await reader.read();\n if (done) break;\n buffer += decoder.decode(value, { stream: true });\n const lines = buffer.split(\"\\n\");\n buffer = lines.pop() ?? \"\";\n for (const line of lines) {\n if (!line.startsWith(\"data:\")) continue;\n const payload = line.slice(5).trim();\n if (payload === \"[DONE]\") continue;\n try {\n const json = JSON.parse(payload);\n if (json.delta) {\n setMessages((prev) => {\n const next = [...prev];\n const last = next[next.length - 1];\n next[next.length - 1] = {\n role: \"assistant\",\n content: last.content + json.delta,\n };\n return next;\n });\n }\n } catch {\n /* ignore partial lines */\n }\n }\n }\n } catch (err) {\n setMessages((prev) => {\n const next = [...prev];\n next[next.length - 1] = {\n role: \"assistant\",\n content: `⚠️ ${(err as Error).message}\\n\\nSet your OPENROUTER_API_KEY to make this work.`,\n };\n return next;\n });\n } finally {\n setLoading(false);\n }\n }\n\n return (\n

\n {messages.length === 0 && (\n

🤖

Chat with my assistant

Ask me anything — responses stream in live.

\n )}\n {messages.map((m, i) => (\n

\n \n {m.content}\n

\n ))}\n

\n );\n}\n","createdAt",["D",1789381670618],"branchVersion","branchId","ee78e4df-9d49-44fe-a93c-3490446f2d42","id","1d4bc60c-9190-4e3b-80f0-e611e6a52e5e","my-chatbot",["D",1789381586527],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","Streaming chat UI powered by an LLM API","imageUrl","cd125b90-c51e-4c9f-9274-8dacceb59852","pinnedFileId","01a09f74-2eca-779e-bf47-465c91838701","pinPreview",true,"pinMigrated","screenshotVersion","likeCount",0,"orgId","01a09f6f-2947-7517-92e3-569021a3ec8a","tursoName","1d4bc60c91904e3b80f0e611e6a52e5e","tursoHostname","1d4bc60c91904e3b80f0e611e6a52e5e-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789468860049],"pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_107":106,"_114":110},"org",{"_107":106,"_108":106,"_109":110,"_19":62,"_111":112,"_113":31},"branch",{"_13":96,"_38":97,"_50":49,"_98":51,"_99":-5,"_100":-5,"_101":-5,"_102":-5,"_103":-5,"_104":52,"_105":106},"isOwned",23,"main","projectId","forkedBranchId","forkedBranchVersion","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","projectName","userHandle","testprojects","handle","displayName","avatar","https://lh3.googleusercontent.com/a/ACg8ocL19u9RGAmDi0AaCxbkMHCSzRnP6BNSjl-M4pd-6tcF-ESMtg=s96-c","tier","free","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_50":51,"_38":52,"_45":252,"_54":-5,"_55":31,"_56":57,"_58":57,"_59":60,"_61":-5,"_19":62,"_63":64,"_65":66,"_67":-5,"_68":-5,"_69":70,"_71":72,"_73":74,"_75":76,"_77":253,"_79":-5,"_80":81,"_82":81,"_83":84,"_85":84,"_86":84,"_87":81,"_88":81,"_89":254,"_91":255,"_93":256,"_95":31},"tree",[181,189,190,191],"files",[181,182,183,184,185,186,187,188,189,190,191],"counts",{"_171":70,"_172":155,"_173":70,"_174":175,"_176":177},"contents",[137,138,139,140],"upstreamProject","upstreamBranch","emptyEnvVars","flags",[],"hasHttpFiles","grants","orgs","customDomains",{},{"_50":165,"_38":166,"_36":167,"_143":-5,"_48":49,"_47":155,"_145":66,"_45":168,"_13":70,"_40":169,"_42":-5,"_30":31,"_150":-5,"_33":170},{"_50":159,"_38":160,"_36":161,"_143":-5,"_48":49,"_47":155,"_145":66,"_45":162,"_13":70,"_40":26,"_42":163,"_30":31,"_150":-5,"_33":164},{"_50":152,"_38":153,"_36":154,"_143":-5,"_48":49,"_47":155,"_145":66,"_45":156,"_13":70,"_40":26,"_42":157,"_30":31,"_150":-5,"_33":158},{"_50":141,"_38":142,"_36":64,"_143":-5,"_48":49,"_47":144,"_145":31,"_45":146,"_13":147,"_40":148,"_42":149,"_30":31,"_150":52,"_33":151},"48d08656-d946-429c-85a2-58750bf47999","index.ts","parentId",6,"latest",["D",1789381666798],2,"http","import { parseVal, serveImmutableFile } from \"https://esm.town/v/std/utils/index.ts\";\nimport { Hono } from \"npm:hono\";\nimport { streamSSE } from \"npm:hono@4/streaming\";\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// Chat endpoint — proxies a streaming OpenRouter chat completion as SSE\napp.post(\"/api/chat\", async (c) => {\n const apiKey = Deno.env.get(\"OPENROUTER_API_KEY\");\n if (!apiKey) {\n return c.json({ error: \"OPENROUTER_API_KEY is not set on this val\" }, 500);\n }\n const { messages } = await c.req.json();\n const model = Deno.env.get(\"OPENROUTER_MODEL\") ?? \"openai/gpt-4o-mini\";\n return streamSSE(c, async (stream) => {\n const upstream = await fetch(\"https://openrouter.ai/api/v1/chat/completions\", {\n method: \"POST\",\n headers: {\n \"Content-Type\": \"application/json\",\n Authorization: `Bearer ${apiKey}`,\n // Optional but recommended by OpenRouter — no tracking unless you set these\n \"HTTP-Referer\": \"https://my-chatbot.val.run\",\n \"X-Title\": \"Val Town Chatbot\",\n },\n body: JSON.stringify({ model, messages, stream: true }),\n });\n if (!upstream.ok || !upstream.body) {\n const text = await upstream.text().catch(() => \"\");\n throw new Error(`OpenAI error ${upstream.status}: ${text.slice(0, 300)}`);\n }\n const reader = upstream.body.getReader();\n const decoder = new TextDecoder();\n let buffer = \"\";\n while (true) {\n const { done, value } = await reader.read();\n if (done) break;\n buffer += decoder.decode(value, { stream: true });\n const lines = buffer.split(\"\\n\");\n buffer = lines.pop() ?? \"\";\n for (const line of lines) {\n const trimmed = line.trim();\n if (!trimmed.startsWith(\"data:\")) continue;\n const data = trimmed.slice(5).trim();\n if (data === \"[DONE]\") return;\n try {\n const json = JSON.parse(data);\n const delta = json.choices?.[0]?.delta?.content;\n if (delta) {\n await stream.writeSSE({ data: JSON.stringify({ delta }) });\n }\n } catch {\n /* ignore malformed chunks */\n }\n }\n }\n await stream.close();\n });\n});\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",[142],"ef9e0035-a6aa-4695-8962-cafea439c74b","README.md","01a09f74-2eca-779e-bf47-439f9bd87169",1,["D",1789381586527],"# 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",[153],"3d18e2c8-0e43-4652-869f-3c1ffc084bc4","CHANGELOG.md","01a09f74-2eca-779e-bf47-3f51db77eb9f",["D",1789381586527],"# 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 · v7