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Next.js 15 App Router patterns — file conventions, data fetching, caching, metadata, streaming, and Server Actions
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
SOC 職業分類に基づく
Activates when working with Python data pipelines, GCS operations, or medallion architecture (Bronze/Silver/Gold). Use this skill for: running pipelines, debugging data transformations, GCS uploads/downloads, data quality validation, CVR/CHR/BFE identifier handling, GeoPandas/PostGIS operations, and DuckDB queries for large files. Keywords: pipeline, bronze, silver, gold, GCS, parquet, CVR, CHR, BFE, transform, ingest, ETL, DuckDB, large files
Activates when querying livestock and animal data from R2. Use this skill for: CHR registry, pig movements, animal welfare, antibiotics, animal density, mortality rates, herd tracking, svineflytning. Keywords: husdyr, livestock, animal, dyr, CHR, svin, pig, ko, cattle, antibiotika, dyrevelfærd, flytning, movement
Activates when querying agricultural land and field data from R2. Use this skill for: field boundaries, crop data, land use, organic farming, production estimates, cadastral data, agricultural blocks, building data. Keywords: landbrugsareal, field, mark, marker, crop, afgrøde, organic, økologisk, production, areal, cadastral, matrikel
Activates when querying employee and workplace safety data from R2. Use this skill for: Arbejdstilsynet inspections, work permits, safety violations, workplace accidents, compliance rates, foreign workers, incident tracking. Keywords: medarbejdere, employees, worker, arbejdstilsynet, inspection, tilsyn, safety, arbejdsmiljø, accident, ulykke, compliance
Activates when querying environmental data from R2. Use this skill for: pesticides, nitrogen leaching, BNBO drinking water protection, wetlands, soil types, environmental compliance, biodiversity. Keywords: miljø, environment, pesticide, pesticid, nitrogen, kvælstof, BNBO, wetlands, vådomr, soil, jord, biodiversity
Activates when querying financial/economic data from R2. Use this skill for: subsidies, farm financials, property values, CVR enrichment, ownership data, støtte per hektar, samlet støtte, grundværdi. Keywords: økonomi, finance, subsidies, støtte, tilskud, CVR, property, ejendom, grundværdi
| name | nextjs-expert |
| description | Next.js 15 App Router patterns — file conventions, data fetching, caching, metadata, streaming, and Server Actions |
Docs version: 15.x. Turbopack available via
--turbopackflag.
app/
layout.tsx # Required root layout — must include <html> and <body>
page.tsx # Route page (default export only)
loading.tsx # Suspense boundary for the whole segment
error.tsx # Error boundary (must be 'use client')
not-found.tsx # 404 for the segment
route.ts # API Route Handler (GET, POST, etc.)
opengraph-image.tsx # OG image (static file or ImageResponse)
sitemap.ts # Dynamic sitemap
robots.ts # robots.txt
Named exports everywhere except the above file conventions (which must be default exports).
// page.tsx, layout.tsx — params is a Promise in Next.js 15
export default async function Page({
params,
searchParams,
}: {
params: Promise<{ slug: string }>
searchParams: Promise<{ q?: string }>
}) {
const { slug } = await params
const { q } = await searchParams
// ...
}
// fetch — NOT cached by default in Next.js 15
const res = await fetch('https://api.example.com/data')
// Explicit cache
const res = await fetch('https://api.example.com/data', { cache: 'force-cache' })
// ISR — revalidate every 60s
const res = await fetch('https://api.example.com/data', { next: { revalidate: 60 } })
// Tagged for on-demand revalidation
const res = await fetch('https://api.example.com/data', { next: { tags: ['posts'] } })
import { cache } from 'react'
import 'server-only'
export const getPost = cache(async (id: string) => {
return db.query.posts.findFirst({ where: eq(posts.id, id) })
})
const [user, posts] = await Promise.all([getUser(id), getPosts(id)])
// Use Promise.allSettled to prevent one failure blocking all
use() hook// Server Component passes promise as prop
const postsPromise = getPosts() // do NOT await
return (
<Suspense fallback={<Skeleton />}>
<PostList posts={postsPromise} />
</Suspense>
)
// Client Component unwraps with use()
'use client'
import { use } from 'react'
export function PostList({ posts }: { posts: Promise<Post[]> }) {
const data = use(posts)
return <ul>{data.map(p => <li key={p.id}>{p.title}</li>)}</ul>
}
// Coarse: loading.tsx wraps entire page in Suspense automatically
// Fine-grained: Suspense around slow component
import { Suspense } from 'react'
export default function Page() {
return (
<>
<StaticHeader />
<Suspense fallback={<Skeleton />}>
<SlowComponent />
</Suspense>
</>
)
}
import { revalidatePath, revalidateTag } from 'next/cache'
import { refresh } from 'next/cache'
// In Server Action after mutation:
revalidatePath('/posts') // revalidate a path
revalidateTag('posts') // revalidate by tag
refresh() // refresh current page without revalidating cache
// Static metadata
export const metadata: Metadata = {
title: 'My Page',
description: '...',
openGraph: {
title: 'My Page',
images: [{ url: '/og.png', width: 1200, height: 630 }],
},
}
// Dynamic metadata
export async function generateMetadata({
params,
}: {
params: Promise<{ slug: string }>
}): Promise<Metadata> {
const { slug } = await params
const post = await getPost(slug)
return { title: post.title }
}
// app/opengraph-image.tsx
import { ImageResponse } from 'next/og'
export const size = { width: 1200, height: 630 }
export const contentType = 'image/png'
export const alt = 'Page title'
export default function Image() {
return new ImageResponse(
<div style={{ display: 'flex', fontSize: 64, background: 'white', width: '100%', height: '100%', alignItems: 'center', justifyContent: 'center' }}>
Hello
</div>,
{ ...size }
)
}
// app/api/posts/route.ts
import { NextRequest, NextResponse } from 'next/server'
export async function GET(request: NextRequest) {
const { searchParams } = new URL(request.url)
const id = searchParams.get('id')
return NextResponse.json({ id })
}
export async function POST(request: NextRequest) {
const body = await request.json()
return NextResponse.json({ ok: true }, { status: 201 })
}
import Image from 'next/image'
import { Inter } from 'next/font/google'
const inter = Inter({ subsets: ['latin'], display: 'swap' })
// Image always needs width + height (or fill + container with position:relative)
<Image src="/hero.png" alt="Hero" width={1200} height={630} priority />
params and searchParams are Promises in Next.js 15 — always await themfetch is NOT cached by default — be explicit with cache or next.revalidate'use client' for interactivitynext build does NOT run linting automatically in Next.js 15 — run separatelyloading.tsx for route-level skeletons, <Suspense> for component-levelPromise.all for parallel data fetching within a component