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SKILL.md
npx skills add sickn33/agentic-awesome-skills --skill nextjs-supabase-auth
Expert integration of Supabase Auth with Next.js App Router
npx skills add sickn33/agentic-awesome-skills --skill nextjs-supabase-auth
Expert integration of Supabase Auth with Next.js App Router
Create properly configured Supabase clients for different contexts
When to use: Setting up auth in a Next.js project
// lib/supabase/client.ts (Browser client) 'use client' import { createBrowserClient } from '@supabase/ssr'
export function createClient() { return createBrowserClient( process.env.NEXT_PUBLIC_SUPABASE_URL!, process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY! ) }
// lib/supabase/server.ts (Server client) import { createServerClient } from '@supabase/ssr' import { cookies } from 'next/headers'
export async function createClient() { const cookieStore = await cookies() return createServerClient( process.env.NEXT_PUBLIC_SUPABASE_URL!, process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!, { cookies: { getAll() { return cookieStore.getAll() }, setAll(cookiesToSet) { cookiesToSet.forEach(({ name, value, options }) => { cookieStore.set(name, value, options) }) }, }, } ) }
Protect routes and refresh sessions in middleware
When to use: You need route protection or session refresh
// middleware.ts import { createServerClient } from '@supabase/ssr' import { NextResponse, type NextRequest } from 'next/server'
export async function middleware(request: NextRequest) { let response = NextResponse.next({ request })
const supabase = createServerClient( process.env.NEXT_PUBLIC_SUPABASE_URL!, process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!, { cookies: { getAll() { return request.cookies.getAll() }, setAll(cookiesToSet) { cookiesToSet.forEach(({ name, value, options }) => { response.cookies.set(name, value, options) }) }, }, } )
// Refresh session if expired const { data: { user } } = await supabase.auth.getUser()
// Protect dashboard routes if (request.nextUrl.pathname.startsWith('/dashboard') && !user) { return NextResponse.redirect(new URL('/login', request.url)) }
return response }
export const config = { matcher: ['/((?!_next/static|_next/image|favicon.ico).*)'], }
Handle OAuth callback and exchange code for session
When to use: Using OAuth providers (Google, GitHub, etc.)
// app/auth/callback/route.ts import { createClient } from '@/lib/supabase/server' import { NextResponse } from 'next/server'
export async function GET(request: Request) { const { searchParams, origin } = new URL(request.url) const code = searchParams.get('code') const next = searchParams.get('next') ?? '/'
if (code) {
const supabase = await createClient()
const { error } = await supabase.auth.exchangeCodeForSession(code)
if (!error) {
return NextResponse.redirect(${origin}${next})
}
}
return NextResponse.redirect(${origin}/auth/error)
}
Handle auth operations in Server Actions
When to use: Login, logout, or signup from Server Components
// app/actions/auth.ts 'use server' import { createClient } from '@/lib/supabase/server' import { redirect } from 'next/navigation' import { revalidatePath } from 'next/cache'
export async function signIn(formData: FormData) { const supabase = await createClient() const { error } = await supabase.auth.signInWithPassword({ email: formData.get('email') as string, password: formData.get('password') as string, })
if (error) { return { error: error.message } }
revalidatePath('/', 'layout') redirect('/dashboard') }
export async function signOut() { const supabase = await createClient() await supabase.auth.signOut() revalidatePath('/', 'layout') redirect('/') }
Access the authenticated user in Server Components
When to use: Rendering user-specific content server-side
// app/dashboard/page.tsx import { createClient } from '@/lib/supabase/server' import { redirect } from 'next/navigation'
export default async function DashboardPage() { const supabase = await createClient() const { data: { user } } = await supabase.auth.getUser()
if (!user) { redirect('/login') }
return (
Severity: ERROR
Message: getSession() doesn't verify the JWT. Use getUser() for secure auth checks.
Fix action: Replace getSession() with getUser() for security-critical checks
Severity: ERROR
Message: Using OAuth but missing callback route at app/auth/callback/route.ts
Fix action: Create app/auth/callback/route.ts to handle OAuth redirects
Severity: ERROR
Message: Browser client used in server context. Use createServerClient instead.
Fix action: Import and use createServerClient from @supabase/ssr
Severity: WARNING
Message: No middleware.ts found. Consider adding middleware for route protection.
Fix action: Create middleware.ts to protect routes and refresh sessions
Severity: WARNING
Message: Hardcoded localhost redirect. Use origin for environment flexibility.
Fix action: Use window.location.origin or process.env.NEXT_PUBLIC_SITE_URL
Severity: WARNING
Message: Auth operation without error handling. Always check for errors.
Fix action: Destructure { data, error } and handle error case
Severity: WARNING
Message: Auth action without revalidatePath. Cache may show stale auth state.
Fix action: Add revalidatePath('/', 'layout') after auth operations
Severity: WARNING
Message: Client-side route protection shows flash of content. Use middleware.
Fix action: Move protection to middleware.ts for better UX
Skills: nextjs-supabase-auth, supabase-backend, nextjs-app-router, vercel-deployment
Workflow:
Skills: nextjs-supabase-auth, stripe-integration, supabase-backend
Workflow:
Works well with: nextjs-app-router, supabase-backend