スタートアップを素早く立ち上げる5つのNext.jsテンプレート

// app/dashboard/page.tsx
import { auth } from '@/lib/auth'
import { redirect } from 'next/navigation'
import { DashboardLayout } from '@/components/DashboardLayout'
import { StatsGrid } from '@/components/StatsGrid'
import { RecentActivity } from '@/components/RecentActivity'

export default async function DashboardPage() {
  const session = await auth()
  if (!session) redirect('/login')

  return (
    <DashboardLayout user={session.user}>
      <h1 className="text-2xl font-bold">Dashboard</h1>
      <StatsGrid userId={session.user.id} />
      <RecentActivity userId={session.user.id} />
    </DashboardLayout>
  )
}

// components/PricingSection.tsx
'use client'
import { motion } from 'framer-motion'
import { Check } from 'lucide-react'

const plans = [
  { name: 'Starter', price: 0, features: ['月100クレジット', '3エンドポイント'] },
  { name: 'Pro', price: 19, features: ['10,000クレジット', '全エンドポイント', 'テンプレート'] },
  { name: 'Enterprise', price: 69, features: ['無制限', '専任サポート', 'SLA'] },
]

export function PricingSection() {
  return (
    <section className="py-24">
      <div className="grid md:grid-cols-3 gap-8">
        {plans.map((plan) => (
          <motion.div key={plan.name} whileHover={{ y: -8 }}
            className="rounded-2xl border p-8">
            <h2 className="text-xl font-bold">{plan.name}</h2>
            <p className="text-4xl font-bold mt-4">{plan.price}€/月</p>
            <ul className="mt-6 space-y-3">
              {plan.features.map(f => (
                <li key={f} className="flex items-center gap-2">
                  <Check className="w-4 h-4 text-green-500" /> {f}
                </li>
              ))}
            </ul>
          </motion.div>
        ))}
      </div>
    </section>
  )
}

// app/api/generate-article/route.ts
import { NextResponse } from 'next/server'
import { auth } from '@/lib/auth'
import { prisma } from '@/lib/prisma'

export async function POST(req: Request) {
  const session = await auth()
  if (!session) return NextResponse.json({ error: '認証されていません' }, { status: 401 })

  const { topic, keywords } = await req.json()

  const response = await fetch('https://ai-empire-steel.vercel.app/api/ai/seo', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'x-api-key': process.env.NEURA_API_KEY!,
    },
    body: JSON.stringify({ topic, keywords, maxTokens: 2000 }),
  })

  const { title, metaDescription, content } = await response.json()

  const article = await prisma.article.create({
    data: { title, metaDescription, content, authorId: session.user.id },
  })

  return NextResponse.json(article)
}

// lib/recommendations.ts
import { prisma } from './prisma'
import { NeuraAPI } from '@neuraapi/sdk'

const ai = new NeuraAPI(process.env.NEURA_API_KEY!)

export async function getRecommendations(productId: string) {
  const product = await prisma.product.findUnique({
    where: { id: productId },
    include: { category: true, tags: true },
  })

  const similar = await prisma.product.findMany({
    where: {
      categoryId: product!.categoryId,
      id: { not: productId },
    },
    take: 4,
    orderBy: { sales: 'desc' },
  })

  const aiRecs = await ai.generate({
    prompt: `"${product!.name}"の${product!.category.name}カテゴリーで補完的な商品を3つ提案してください`,
    maxTokens: 200,
  })

  return { similar, aiSuggestions: aiRecs.content }
}

// components/AnalyticsChart.tsx
'use client'
import { useQuery } from '@tanstack/react-query'
import { BarChart, Bar, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer } from 'recharts'

export function AnalyticsChart({ period = '7d' }) {
  const { data } = useQuery({
    queryKey: ['analytics', period],
    queryFn: () => fetch(`/api/analytics?period=${period}`).then(r => r.json()),
  })

  return (
    <div className="rounded-xl border bg-card p-6">
      <h3 className="text-lg font-semibold mb-4">収益</h3>
      <ResponsiveContainer width="100%" height={300}>
        <BarChart data={data?.revenue || []}>
          <CartesianGrid strokeDasharray="3 3" />
          <XAxis dataKey="date" />
          <YAxis />
          <Tooltip />
          <Bar dataKey="amount" fill="#6366f1" radius={[4, 4, 0, 0]} />
        </BarChart>
      </ResponsiveContainer>
    </div>
  )
}