mediar-ai/clerk-nextjs-patterns
packages/skills/skills/clerk-nextjs-patterns/SKILL.md
Advanced Next.js patterns - middleware, Server Actions, caching with Clerk.
$ install --global
skillsauthnpx skillsauth add mediar-ai/skillhubz clerk-nextjs-patternsInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Apr 18, 2026, 6:42 AM31.0s1 file scanned
SKILL.md
- name:
- clerk-nextjs-patterns
- description:
- Advanced Next.js patterns - middleware, Server Actions, caching with Clerk.
- license:
- MIT
- allowed-tools:
- WebFetch
- author:
- clerk
- version:
- 1.0.0
Next.js Patterns
For basic setup, see setup/.
Impact Levels
- CRITICAL - Breaking bugs, security holes
- HIGH - Common mistakes
- MEDIUM - Optimization
References
| Reference | Impact |
|-----------|--------|
| references/server-vs-client.md | CRITICAL - await auth() vs hooks |
| references/middleware-strategies.md | HIGH - Public-first vs protected-first |
| references/server-actions.md | HIGH - Protect mutations |
| references/api-routes.md | HIGH - 401 vs 403 |
| references/caching-auth.md | MEDIUM - User-scoped caching |
Mental Model
Server vs Client = different auth APIs:
- Server:
await auth()from@clerk/nextjs/server(async!) - Client:
useAuth()hook from@clerk/nextjs(sync)
Never mix them. Server Components use server imports, Client Components use hooks.
Minimal Pattern
// Server Component
import { auth } from '@clerk/nextjs/server'
export default async function Page() {
const { userId } = await auth() // MUST await!
if (!userId) return <p>Not signed in</p>
return <p>Hello {userId}</p>
}
Common Pitfalls
| Symptom | Cause | Fix |
|---------|-------|-----|
| undefined userId in Server Component | Missing await | await auth() not auth() |
| Auth not working on API routes | Missing matcher | Add '/(api|trpc)(.*)' to middleware |
| Cache returns wrong user's data | Missing userId in key | Include userId in unstable_cache key |
| Mutations bypass auth | Unprotected Server Action | Check auth() at start of action |
| Wrong HTTP error code | Confused 401/403 | 401 = not signed in, 403 = no permission |
See Also
setup/managing-orgs/
Docs
Next.js SDK
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