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jvsandhu
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clerk_auth

Implements Clerk authentication with middleware, providers, and server-side session checks in Next.js applications.

Updated Jan 14, 2026
Search Tags:#typescript#authentication#middleware#next.js#session management#clerk#webauthn
One-click install
npx skills add https://github.com/jvsandhu/agentic-skills --skill clerk-auth-jvsandhu
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: clerk_auth
Source: https://github.com/jvsandhu/agentic-skills/tree/main/skills/clerk_auth
Command: npx skills add https://github.com/jvsandhu/agentic-skills --skill clerk-auth-jvsandhu

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires @clerk/nextjs.

What problem does it solve? Adding authentication to a Next.js application requires coordinating middleware, providers, UI components, and server-side checks, and misconfiguring any layer leaves routes unprotected or breaks static assets. ## Core Features & Use Cases - Middleware Setup: Configure clerkMiddleware with route matchers to separate public and private routes without blocking static files. - Prebuilt UI Components: Use SignInButton, SignUpButton, UserButton, SignedIn, and SignedOut for conditional rendering based on session state. - Server-Side Protection: Validate requests with auth() and currentUser() in API routes, returning 401 for unauthenticated calls. - Use Case: You are building a Next.js SaaS dashboard and need login, signup, and protected API endpoints; follow the three-phase workflow to integrate Clerk, wrap the layout in ClerkProvider, and guard your API routes. ## Quick Start Ask the agent to add Clerk authentication to your Next.js app with middleware protection and a sign-in button in the header.

Frequently Asked Questions about clerk_auth

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I add Clerk authentication to a Next.js app?▼

Install @clerk/nextjs, add clerkMiddleware to middleware.ts with route matchers, and wrap your root layout in ClerkProvider. Then use SignInButton and UserButton components for the UI and auth() for server-side checks.

How to protect API routes with Clerk in Next.js?▼

Call auth() inside your route handler and check the returned userId. If userId is null, return a 401 Unauthorized response; otherwise use currentUser() to access the full user object.

Does Clerk middleware block static files like images and CSS?▼

No, if configured correctly. The recommended matcher pattern '/((?!.*\\..*|_next).*)' excludes files with extensions and Next.js internals, so images, CSS, and fonts load without authentication.

How do I show different UI for signed-in and signed-out users?▼

Wrap components in the SignedIn and SignedOut components from @clerk/nextjs. Content inside SignedOut renders only for guests, while SignedIn content renders only for authenticated users.

Can I sync Clerk users with my own database?▼

Yes, Clerk supports webhooks for user synchronization. Set up a webhook endpoint to receive user events and write the data to your own database as an optional Phase 3 step.

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