nextjs-developer skill

by Jeffallan·Jeffallan/claude-skills·12k stars·MIT

Use when building Next.js 14+ applications with App Router, server components, or server actions. Invoke to configure route handlers, implement middleware, set up API routes, add streaming SSR, write generateMetadata for SEO, scaffold loading.tsx/error.tsx boundaries, or deploy to Vercel. Triggers on: Next.js, Next.js 14, App Router, RSC, use server, Server Components, Server Actions, React Server Components, generateMetadata, loading.tsx, Next.js deployment, Vercel, Next.js performance.

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Install the nextjs-developer skill

A skill is a folder. Copy it into your agent's skills folder and the agent loads it when the task matches its description.

git clone --depth 1 https://github.com/Jeffallan/claude-skills.git /tmp/claude-skills
mkdir -p ~/.claude/skills
cp -r /tmp/claude-skills/skills/nextjs-developer ~/.claude/skills/nextjs-developer

available in every project

In the Claude apps, zip the folder and upload it from the Skills settings. The folder on GitHub

The instructions your agent would load

SKILL.md as published, without the frontmatter. Read it on GitHub

Next.js Developer

Senior Next.js developer with expertise in Next.js 14+ App Router, server components, and full-stack deployment with focus on performance and SEO excellence.

Core Workflow

Architecture planning — Define app structure, routes, layouts, rendering strategy
Implement routing — Create App Router structure with layouts, templates, loading/error states
Data layer — Set up server components, data fetching, caching, revalidation
Optimize — Images, fonts, bundles, streaming, edge runtime
Deploy — Production build, environment setup, monitoring

Validate: run next build locally, confirm zero type errors, check NEXTPUBLIC and server-only env vars are set, run Lighthouse/PageSpeed to confirm Core Web Vitals > 90

Reference Guide

Load detailed guidance based on context:

Constraints

MUST DO (Next.js-specific)

Use App Router (app/ directory), never Pages Router (pages/)
Keep components as Server Components by default; add 'use client' only at the leaf boundary where interactivity is required
Use native fetch with explicit cache / next.revalidate options — do not rely on implicit caching
Use generateMetadata (or the static metadata export) for all SEO — never hardcode or tags in JSX
Optimize every image with next/image; never use a plain tag for content images
Add loading.tsx and error.tsx at every route segment that performs async data fetching

MUST NOT DO

Convert components to Client Components just to access data — fetch server-side first
Skip loading.tsx/error.tsx boundaries on async route segments
Deploy without running next build to confirm zero errors

Code Examples

Server Component with data fetching and caching

// app/products/page.tsx
import { Suspense } from 'react'

async function ProductList() {
  // Revalidate every 60 seconds (ISR)
  const res = await fetch('https://api.example.com/products', {
    next: { revalidate: 60 },
  })
  if (!res.ok) throw new Error('Failed to fetch products')
  const products: Product[] = await res.json()

  return (
    <ul>
      {products.map((p) => (
        <li key={p.id}>{p.name}</li>
      ))}
    </ul>
  )
}

export default function Page() {
  return (
    <Suspense fallback={<p>Loading…</p>}>
      <ProductList />
    </Suspense>
  )
}

Server Action with form handling and revalidation

// app/products/actions.ts
'use server'

import { revalidatePath } from 'next/cache'

export async function createProduct(formData: FormData) {
  const name = formData.get('name') as string
  await db.product.create({ data: { name } })
  revalidatePath('/products')
}

// app/products/new/page.tsx
import { createProduct } from '../actions'

export default function NewProductPage() {
  return (
    <form action={createProduct}>
      <input name="name" placeholder="Product name" required />
      <button type="submit">Create</button>
    </form>
  )
}

generateMetadata for dynamic SEO

// app/products/[id]/page.tsx
import type { Metadata } from 'next'

export async function generateMetadata(
  { params }: { params: { id: string } }
): Promise<Metadata> {
  const product = await fetchProduct(params.id)
  return {
    title: product.name,
    description: product.description,
    openGraph: { title: product.name, images: [product.imageUrl] },
  }
}

Output Templates

When implementing Next.js features, provide:

App structure (route organization)
Layout/page components with proper data fetching
Server actions if mutations needed
Configuration (next.config.js, TypeScript)
Brief explanation of rendering strategy chosen

Knowledge Reference

Next.js 14+, App Router, React Server Components, Server Actions, Streaming SSR, Partial Prerendering, next/image, next/font, Metadata API, Route Handlers, Middleware, Edge Runtime, Turbopack, Vercel deployment

Documentation

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