undefined

**Result**: Full-stack app running in ~5 minutes with:
- ✅ Frontend and backend connected
- ✅ Core Cloudflare services configured (D1, KV, R2, Workers AI)
- ✅ AI SDK ready with multiple providers
- ✅ Planning docs and session handoff protocol
- ✅ Dark mode, theming, UI components
- ✅ Optional features (1 script each to enable):
  - Clerk Auth (`npm run enable-auth`)
  - AI Chat UI (`npm run enable-ai-chat`)
  - Queues (`npm run enable-queues`)
  - Vectorize (`npm run enable-vectorize`)

scaffold/
├── package.json              # All dependencies (React, Hono, AI SDK, Clerk)
├── tsconfig.json            # TypeScript config
├── vite.config.ts           # Cloudflare Vite plugin
├── wrangler.jsonc           # All Cloudflare services configured
├── .dev.vars.example        # Environment variables template
├── .gitignore               # Standard ignores
├── README.md                # Project-specific readme
├── CLAUDE.md                # Project instructions for Claude
├── SCRATCHPAD.md            # Session handoff protocol
├── CHANGELOG.md             # Version history
├── schema.sql               # D1 database schema
│
├── docs/                    # Complete planning docs
│   ├── ARCHITECTURE.md
│   ├── DATABASE_SCHEMA.md
│   ├── API_ENDPOINTS.md
│   ├── IMPLEMENTATION_PHASES.md
│   ├── UI_COMPONENTS.md
│   └── TESTING.md
│
├── migrations/              # D1 migrations
│   └── 0001_initial.sql
│
├── src/                     # Frontend (React + Vite + Tailwind v4)
│   ├── main.tsx
│   ├── App.tsx
│   ├── index.css           # Tailwind v4 theming
│   ├── components/
│   │   ├── ui/             # shadcn/ui components
│   │   ├── ThemeProvider.tsx
│   │   ├── ProtectedRoute.tsx     # Auth (COMMENTED)
│   │   └── ChatInterface.tsx      # AI chat (COMMENTED)
│   ├── lib/
│   │   ├── utils.ts        # cn() utility
│   │   └── api-client.ts   # Fetch wrapper
│   └── pages/
│       ├── Home.tsx
│       ├── Dashboard.tsx
│       └── Chat.tsx        # AI chat page (COMMENTED)
│
└── backend/                 # Backend (Hono + Cloudflare)
    ├── src/
    │   └── index.ts        # Main Worker entry
    ├── middleware/
    │   ├── cors.ts
    │   └── auth.ts         # JWT (COMMENTED)
    ├── routes/
    │   ├── api.ts          # Basic API routes
    │   ├── d1.ts           # D1 examples
    │   ├── kv.ts           # KV examples
    │   ├── r2.ts           # R2 examples
    │   ├── ai.ts           # Workers AI (direct binding)
    │   ├── ai-sdk.ts       # AI SDK examples (multiple providers)
    │   ├── vectorize.ts    # Vectorize examples
    │   └── queues.ts       # Queues examples
    └── db/
        └── queries.ts      # D1 typed query helpers

// Already works, no API key needed
const result = await c.env.AI.run('@cf/meta/llama-3-8b-instruct', {
  messages: [{ role: 'user', content: 'Hello' }]
})

import { streamText } from 'ai'
import { createWorkersAI } from 'workers-ai-provider'

const workersai = createWorkersAI({ binding: c.env.AI })
const result = await streamText({
  model: workersai('@cf/meta/llama-3-8b-instruct'),
  messages: [{ role: 'user', content: 'Hello' }]
})

import { openai } from '@ai-sdk/openai'
import { anthropic } from '@ai-sdk/anthropic'

// Switch providers in 1 line
const result = await streamText({
  model: openai('gpt-4o'),  // or anthropic('claude-sonnet-4-5')
  messages: [{ role: 'user', content: 'Hello' }]
})

import { useChat } from '@ai-sdk/react'
import { DefaultChatTransport } from 'ai'
import { useState } from 'react'

function ChatInterface() {
  const [input, setInput] = useState('')
  const { messages, sendMessage, status } = useChat({
    transport: new DefaultChatTransport({
      api: '/api/ai-sdk/chat',
    }),
  })

  // Send message on Enter key
  const handleKeyDown = (e) => {
    if (e.key === 'Enter' && status === 'ready' && input.trim()) {
      sendMessage({ text: input })
      setInput('')
    }
  }

  // Render messages (v5 uses message.parts[])
  return (
    <div>
      {messages.map(m => (
        <div key={m.id}>
          {m.parts.map(part => {
            if (part.type === 'text') return <div>{part.text}</div>
          })}
        </div>
      ))}
      <input
        value={input}
        onChange={e => setInput(e.target.value)}
        onKeyDown={handleKeyDown}
        disabled={status !== 'ready'}
      />
    </div>
  )
}

import { useForm } from 'react-hook-form'
import { zodResolver } from '@hookform/resolvers/zod'

const form = useForm({
  resolver: zodResolver(userSchema), // Zod validation
})

<input {...register('name')} />
{errors.name && <span>{errors.name.message}</span>}

// Define schema once
const userSchema = z.object({
  name: z.string().min(2),
  email: z.string().email(),
  age: z.number().int().positive().optional(),
})

// Infer TypeScript type
type User = z.infer<typeof userSchema>

// Use in frontend (React Hook Form)
resolver: zodResolver(userSchema)

// Use in backend (same schema!)
const validated = userSchema.parse(requestBody)

// Fetch data with automatic caching
const { data, isLoading } = useQuery({
  queryKey: ['users'],
  queryFn: () => apiClient.get('/api/users'),
})

// Update data with mutations
const mutation = useMutation({
  mutationFn: (newUser) => apiClient.post('/api/users', newUser),
  onSuccess: () => {
    queryClient.invalidateQueries({ queryKey: ['users'] })
  },
})

./scripts/enable-auth.sh

**What gets enabled**:
- Frontend: ProtectedRoute component, auth in api-client
- Backend: JWT verification middleware
- Protected API routes
- Auth loading states
- Session management

undefined

**Visit**: http://localhost:5173

./scripts/enable-auth.sh

undefined

./scripts/enable-ai-chat.sh

**Visit**: http://localhost:5173/chat

undefined

undefined

// backend/routes/my-feature.ts
import { Hono } from 'hono'

export const myFeatureRoutes = new Hono()

myFeatureRoutes.get('/hello', (c) => {
  return c.json({ message: 'Hello from my feature!' })
})

// backend/src/index.ts
import { myFeatureRoutes } from './routes/my-feature'
app.route('/api/my-feature', myFeatureRoutes)

// Change this line:
model: openai('gpt-4o'),

// To this:
model: anthropic('claude-sonnet-4-5'),

// Or this:
model: google('gemini-2.5-flash'),

// Or use Workers AI:
const workersai = createWorkersAI({ binding: c.env.AI })
model: workersai('@cf/meta/llama-3-8b-instruct'),

:root {
  --background: hsl(0 0% 100%);  /* Change colors here */
  --foreground: hsl(0 0% 3.9%);
  --primary: hsl(220 90% 56%);
  /* etc */
}

// ✅ CORRECT: Use relative URLs
fetch('/api/data')

// ❌ WRONG: Don't use absolute URLs
fetch('http://localhost:8787/api/data')

VITE_CLERK_PUBLISHABLE_KEY=pk_test_xxx

CLERK_SECRET_KEY=sk_test_xxx
OPENAI_API_KEY=sk-xxx

// ✅ CORRECT ORDER
app.use('/api/*', corsMiddleware)
app.post('/api/data', handler)

// ❌ WRONG - Will cause CORS errors
app.post('/api/data', handler)
app.use('/api/*', corsMiddleware)

const { isLoaded, isSignedIn } = useSession()

useEffect(() => {
  if (!isLoaded) return  // Wait for auth
  fetch('/api/protected').then(/* ... */)
}, [isLoaded])

import { jwtAuthMiddleware } from './middleware/auth'

app.use('/api/protected/*', jwtAuthMiddleware)

{
  "dependencies": {
    "react": "^19.2.0",
    "react-dom": "^19.2.0",
    "hono": "^4.10.2",
    "@cloudflare/vite-plugin": "^1.13.14",

    "ai": "^5.0.76",
    "@ai-sdk/openai": "^1.0.0",
    "@ai-sdk/anthropic": "^1.0.0",
    "@ai-sdk/google": "^1.0.0",
    "workers-ai-provider": "^2.0.0",
    "@ai-sdk/react": "^1.0.0",

    "@clerk/clerk-react": "^5.53.3",
    "@clerk/backend": "^2.19.0",

    "tailwindcss": "^4.1.14",
    "@tailwindcss/vite": "^4.1.14",
    "class-variance-authority": "^0.7.0",
    "clsx": "^2.1.1",
    "tailwind-merge": "^2.5.4",

    "zod": "^3.24.1",
    "react-hook-form": "^7.54.2",
    "@hookform/resolvers": "^3.9.1",

    "@tanstack/react-query": "^5.62.11",

    "@radix-ui/react-slot": "^1.1.1",
    "@radix-ui/react-dropdown-menu": "^2.1.4"
  },
  "devDependencies": {
    "@types/react": "^19.0.0",
    "@types/react-dom": "^19.0.0",
    "typescript": "^5.7.2",
    "vite": "^7.1.11",
    "wrangler": "^4.0.0"
  }
}

cp -r scaffold/ my-app/
cd my-app/
npm install

**Enable auth**:
```bash
./scripts/enable-auth.sh

./scripts/enable-ai-chat.sh

npm run build
npx wrangler deploy