aiskillstore/nextjs-15-patterns
skills/barnhardt-enterprises-inc/nextjs-15-patterns/SKILL.md
Next.js 15 App Router patterns and best practices.
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SKILL.md
- name:
- nextjs-15-patterns
- description:
- Next.js 15 App Router patterns and best practices.
Next.js 15 Patterns
Server vs Client Components
Default: Server Components
// app/users/page.tsx - Server Component (default)
export default async function UsersPage() {
const users = await getUsers(); // Direct DB access
return <UserList users={users} />;
}
Client Components (when needed)
// components/counter.tsx
'use client';
import { useState } from 'react';
export function Counter() {
const [count, setCount] = useState(0);
return <button onClick={() => setCount(c => c + 1)}>{count}</button>;
}
Server Actions
// actions/user-actions.ts
'use server';
import { revalidatePath } from 'next/cache';
import { z } from 'zod';
const CreateUserSchema = z.object({
name: z.string().min(1),
email: z.string().email(),
});
export async function createUser(formData: FormData) {
const validated = CreateUserSchema.safeParse({
name: formData.get('name'),
email: formData.get('email'),
});
if (!validated.success) {
return { error: validated.error.flatten() };
}
const user = await db.insert(users).values(validated.data).returning();
revalidatePath('/users');
return { data: user };
}
Data Fetching
In Server Components
// Direct async/await - no useEffect needed
async function UserProfile({ id }: { id: string }) {
const user = await getUser(id);
if (!user) notFound();
return <Profile user={user} />;
}
With Loading States
// app/users/loading.tsx
export default function Loading() {
return <UserListSkeleton />;
}
With Error Handling
// app/users/error.tsx
'use client';
export default function Error({
error,
reset,
}: {
error: Error;
reset: () => void;
}) {
return (
<div>
<h2>Something went wrong</h2>
<button onClick={reset}>Try again</button>
</div>
);
}
Route Handlers (API)
// app/api/users/route.ts
import { NextResponse } from 'next/server';
export async function GET() {
const users = await getUsers();
return NextResponse.json(users);
}
export async function POST(request: Request) {
const body = await request.json();
const user = await createUser(body);
return NextResponse.json(user, { status: 201 });
}
Metadata
// app/users/[id]/page.tsx
import { Metadata } from 'next';
export async function generateMetadata({
params,
}: {
params: { id: string };
}): Promise<Metadata> {
const user = await getUser(params.id);
return {
title: user?.name ?? 'User',
description: `Profile for ${user?.name}`,
};
}
Parallel Routes
app/
├── @modal/
│ └── (.)photo/[id]/page.tsx # Intercepted modal
├── layout.tsx
└── page.tsx
Best Practices
- Prefer Server Components - Only use 'use client' when needed
- Colocate data fetching - Fetch where data is used
- Use Server Actions - For mutations, not API routes
- Streaming with Suspense - For progressive loading
- Validate all inputs - Use Zod for server actions
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