Frontend:
- React / Next.js 14+
- TypeScript
- Tailwind CSS
- TanStack Query (data fetching)
- Zustand (state management)

Backend (BaaS):
- bkend.ai
  - Auto REST API
  - MongoDB database
  - Built-in authentication (JWT)
  - Real-time features (WebSocket)

Deployment:
- Vercel (frontend)
- bkend.ai (backend)

project/
├── src/
│   ├── app/                    # Next.js App Router
│   │   ├── (auth)/            # Auth-related routes
│   │   │   ├── login/
│   │   │   └── register/
│   │   ├── (main)/            # Main routes
│   │   │   ├── dashboard/
│   │   │   └── settings/
│   │   ├── layout.tsx
│   │   └── page.tsx
│   │
│   ├── components/             # UI components
│   │   ├── ui/                # Basic UI (Button, Input...)
│   │   └── features/          # Feature-specific components
│   │
│   ├── hooks/                  # Custom hooks
│   │   ├── useAuth.ts
│   │   └── useQuery.ts
│   │
│   ├── lib/                    # Utilities
│   │   ├── bkend.ts           # bkend.ai client
│   │   └── utils.ts
│   │
│   ├── stores/                 # State management (Zustand)
│   │   └── auth-store.ts
│   │
│   └── types/                  # TypeScript types
│       └── index.ts
│
├── docs/                       # PDCA documents
│   ├── 01-plan/
│   ├── 02-design/
│   │   ├── data-model.md      # Data model
│   │   └── api-spec.md        # API specification
│   ├── 03-analysis/
│   └── 04-report/
│
├── .mcp.json                   # bkend.ai MCP config (type: http)
├── .env.local                  # Environment variables
├── package.json
└── README.md

// lib/bkend.ts - REST Service API Client
const API_BASE = process.env.NEXT_PUBLIC_BKEND_API_URL || 'https://api.bkend.ai/v1';
const PROJECT_ID = process.env.NEXT_PUBLIC_BKEND_PROJECT_ID!;
const ENVIRONMENT = process.env.NEXT_PUBLIC_BKEND_ENV || 'dev';

async function bkendFetch(path: string, options: RequestInit = {}) {
  const token = localStorage.getItem('bkend_access_token');
  const res = await fetch(`${API_BASE}${path}`, {
    ...options,
    headers: {
      'Content-Type': 'application/json',
      'x-project-id': PROJECT_ID,
      'x-environment': ENVIRONMENT,
      ...(token && { Authorization: `Bearer ${token}` }),
      ...options.headers,
    },
  });
  if (!res.ok) throw new Error(await res.text());
  return res.json();
}

export const bkend = {
  auth: {
    signup: (body: {email: string; password: string}) => bkendFetch('/auth/email/signup', {method: 'POST', body: JSON.stringify(body)}),
    signin: (body: {email: string; password: string}) => bkendFetch('/auth/email/signin', {method: 'POST', body: JSON.stringify(body)}),
    me: () => bkendFetch('/auth/me'),
    refresh: (refreshToken: string) => bkendFetch('/auth/refresh', {method: 'POST', body: JSON.stringify({refreshToken})}),
    signout: () => bkendFetch('/auth/signout', {method: 'POST'}),
  },
  data: {
    list: (table: string, params?: Record<string,string>) => bkendFetch(`/data/${table}?${new URLSearchParams(params)}`),
    get: (table: string, id: string) => bkendFetch(`/data/${table}/${id}`),
    create: (table: string, body: any) => bkendFetch(`/data/${table}`, {method: 'POST', body: JSON.stringify(body)}),
    update: (table: string, id: string, body: any) => bkendFetch(`/data/${table}/${id}`, {method: 'PATCH', body: JSON.stringify(body)}),
    delete: (table: string, id: string) => bkendFetch(`/data/${table}/${id}`, {method: 'DELETE'}),
  },
};

// hooks/useAuth.ts
import { create } from 'zustand';
import { persist } from 'zustand/middleware';
import { bkend } from '@/lib/bkend';

interface AuthState {
  user: User | null;
  isLoading: boolean;
  login: (email: string, password: string) => Promise<void>;
  logout: () => void;
}

export const useAuth = create<AuthState>()(
  persist(
    (set) => ({
      user: null,
      isLoading: false,

      login: async (email, password) => {
        set({ isLoading: true });
        const { user, token } = await bkend.auth.login({ email, password });
        set({ user, isLoading: false });
      },

      logout: () => {
        bkend.auth.logout();
        set({ user: null });
      },
    }),
    { name: 'auth-storage' }
  )
);

// List query
const { data, isLoading, error } = useQuery({
  queryKey: ['items', filters],
  queryFn: () => bkend.collection('items').find(filters),
});

// Single item query
const { data: item } = useQuery({
  queryKey: ['items', id],
  queryFn: () => bkend.collection('items').findById(id),
  enabled: !!id,
});

// Create/Update (Mutation)
const mutation = useMutation({
  mutationFn: (newItem) => bkend.collection('items').create(newItem),
  onSuccess: () => {
    queryClient.invalidateQueries(['items']);
  },
});

// components/ProtectedRoute.tsx
'use client';

import { useAuth } from '@/hooks/useAuth';
import { redirect } from 'next/navigation';

export function ProtectedRoute({ children }: { children: React.ReactNode }) {
  const { user, isLoading } = useAuth();

  if (isLoading) return <LoadingSpinner />;
  if (!user) redirect('/login');

  return <>{children}</>;
}

// Base fields (auto-generated)
interface BaseDocument {
  _id: string;
  createdAt: Date;
  updatedAt: Date;
}

// User reference
interface Post extends BaseDocument {
  userId: string;        // Author ID (reference)
  title: string;
  content: string;
  tags: string[];        // Array field
  metadata: {            // Embedded object
    viewCount: number;
    likeCount: number;
  };
}

claude mcp add bkend --transport http https://api.bkend.ai/mcp

{
  "mcpServers": {
    "bkend": {
      "type": "http",
      "url": "https://api.bkend.ai/mcp"
    }
  }
}

undefined

NEXT_PUBLIC_BKEND_API_URL=https://api.bkend.ai/v1
NEXT_PUBLIC_BKEND_PROJECT_ID=your-project-id
NEXT_PUBLIC_BKEND_ENV=dev

❌ Complex backend logic (serverless function limits)
❌ Large-scale traffic (within BaaS limits)
❌ Custom infrastructure control
❌ Microservices architecture

→ "Traffic will increase significantly"
→ "I want to split into microservices"
→ "I need my own server/infrastructure"
→ "I need complex backend logic"

/output-style bkit-pdca-guide