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clerk-core-workflow-b Implement session management and middleware with Clerk.
Use when managing user sessions, configuring route protection,
or implementing token refresh and custom JWT templates.
Trigger with phrases like "clerk session", "clerk middleware",
"clerk route protection", "clerk token", "clerk JWT".
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name clerk-core-workflow-b description Implement session management and middleware with Clerk.
Use when managing user sessions, configuring route protection,
or implementing token refresh and custom JWT templates.
Trigger with phrases like "clerk session", "clerk middleware",
"clerk route protection", "clerk token", "clerk JWT".
allowed-tools Read, Write, Edit, Grep version 1.0.0 license MIT author Jeremy Longshore <jeremy@intentsolutions.io> compatible-with claude-code, codex, openclaw tags ["saas","clerk","clerk-core","sessions","middleware"]
Clerk Core Workflow B: Session & Middleware
Overview
Implement session management and route protection with Clerk middleware. Covers clerkMiddleware() configuration, auth() patterns, custom session claims, JWT templates for external services, organization-scoped sessions, and session token v2.
Prerequisites
@clerk/nextjs installed with ClerkProvider wrapping the appNext.js 14+ with App Router
Sign-in/sign-up flows working (clerk-core-workflow-a completed)
Instructions
Step 1: Configure clerkMiddleware with Route Matchers
import { clerkMiddleware, createRouteMatcher } from '@clerk/nextjs/server'
const isPublicRoute = createRouteMatcher ([
'/' ,
'/sign-in(.*)' ,
'/sign-up(.*)' ,
'/api/webhooks(.*)' ,
'/pricing' ,
'/blog(.*)' ,
])
const isAdminRoute = createRouteMatcher (['/admin(.*)' ])
const isApiRoute = createRouteMatcher (['/api(.*)' ])
export default clerkMiddleware (async (auth, req) => {
if (isPublicRoute (req)) return
if (isAdminRoute (req)) {
await auth.protect ({ role : 'org:admin' })
return
}
await
protect
export
const
matcher
'/((?!_next|[^?]*\\.(?:html?|css|js(?!on)|jpe?g|webp|png|gif|svg|ttf|woff2?|ico|csv|docx?|xlsx?|zip|webmanifest)).*)'
'/(api|trpc)(.*)'
Key behavior: clerkMiddleware() does NOT protect any routes by default. You must explicitly call auth.protect() for routes that require authentication. This is a design decision to avoid over-blocking.
Step 2: Protect API Routes with auth()
import { auth } from '@clerk/nextjs/server'
export async function GET (const { userId, orgId, has } = await auth ()
if (!userId) {
return Response .json ({ error : 'Unauthorized' }, { status : 401 })
}
if (!has ({ permission : 'org:data:read' })) {
return Response .json ({ error : 'Forbidden' }, { status : 403 })
}
const data = orgId
? await db.items .findMany ({ where : { organizationId : orgId } })
: await db.items .findMany ({ where : { ownerId : userId } })
return Response .json ({ data, userId, orgId })
}
export async function POST (req : Request const { userId, orgId, has } = await auth ()
if (!userId) return Response .json ({ error : 'Unauthorized' }, { status : 401 })
if (!has ({ permission : 'org:data:write' })) {
return Response .json ({ error : 'Forbidden' }, { status : 403 })
}
const body = await req.json ()
const item = await db.items .create ({
data : { ...body, ownerId : userId, organizationId : orgId },
})
return Response .json ({ item }, { status : 201 })
}
Step 3: Server Component Auth Patterns
import { auth, currentUser } from '@clerk/nextjs/server'
import { redirect } from 'next/navigation'
export default async function DashboardPage (const { userId, orgId, orgRole, has, sessionClaims } = await auth ()
if (!userId) redirect ('/sign-in' )
const isAdmin = has ({ role : 'org:admin' })
const user = await currentUser ()
return (
<div >
<h1 > Welcome, {user?.firstName}</h1 >
<p > Organization: {orgId || 'Personal account'}</p >
<p > Role: {orgRole || 'N/A'}</p >
{isAdmin && <a href ="/admin" > Admin Panel</a > }
</div >
Step 4: Custom Session Claims Customize in Dashboard > Sessions > Customize session token:
{
"metadata" : "{{user.public_metadata}}" ,
"email" : "{{user.primary_email_address}}"
}
Then declare types and access in code:
declare global {
interface CustomJwtSessionClaims {
metadata ?: {
role ?: string
plan ?: string
}
email ?: string
}
}
export {}
import { auth } from '@clerk/nextjs/server'
export async function GET (const { sessionClaims } = await auth ()
const userPlan = sessionClaims?.metadata ?.plan || 'free'
const userEmail = sessionClaims?.email
return Response .json ({ plan : userPlan, email : userEmail })
}
Warning: Session token cookie limit is 4KB. Custom claims should be under 1.2KB. Store large data in your database, not in session claims.
Step 5: JWT Templates for External Services
import { auth } from '@clerk/nextjs/server'
import { createClient } from '@supabase/supabase-js'
export async function GET (const { userId, getToken } = await auth ()
if (!userId) return Response .json ({ error : 'Unauthorized' }, { status : 401 })
const supabaseToken = await getToken ({ template : 'supabase' })
const supabase = createClient (
process.env .NEXT_PUBLIC_SUPABASE_URL !,
process.env .NEXT_PUBLIC_SUPABASE_ANON_KEY !,
{ global : { headers : { Authorization : `Bearer ${supabaseToken} ` } } }
)
const { data } = await supabase.from ('items' ).select ('*' )
return Response .json ({ data })
}
Configure JWT template in Dashboard > JWT Templates > New template :
{
"sub" : "{{user.id}}" ,
"email" : "{{user.primary_email_address}}" ,
"role" : "authenticated" ,
"aud" : "authenticated"
}
Step 6: Organization-Scoped Sessions 'use client'
import { useOrganizationList, useOrganization, useAuth } from '@clerk/nextjs'
export function OrgSwitcher (const { organizationList, setActive, isLoaded } = useOrganizationList ({
userMemberships : { infinite : true },
})
const { organization } = useOrganization ()
if (!isLoaded) return <div > Loading orgs...</div > return (
<div >
<p > Active: {organization?.name || 'Personal account'}</p >
<ul >
{organizationList?.map(({ organization: org, membership }) => (
<li key ={org.id} >
<button onClick ={() => setActive({ organization: org.id })}>
{org.name} ({membership.role})
</button >
</li >
))}
<li >
<button onClick ={() => setActive({ organization: null })}>
Personal account
</button >
</li >
</ul >
</div >
Step 7: Server Action Permission Guards 'use server'
import { auth } from '@clerk/nextjs/server'
export async function deleteItem (itemId : string const { userId, orgId, has } = await auth ()
if (!userId) throw new Error ('Unauthorized' )
if (!has ({ permission : 'org:data:delete' })) {
throw new Error ('You do not have permission to delete items' )
}
await db.items .delete ({ where : { id : itemId, organizationId : orgId } })
return { success : true }
}
export async function updateOrgSettings (settings : Record <string , any >const { orgId, has } = await auth ()
if (!orgId) throw new Error ('No organization selected' )
if (!has ({ role : 'org:admin' })) {
throw new Error ('Only admins can update organization settings' )
}
await db.orgSettings .upsert ({
where : { orgId },
update : settings,
create : { orgId, ...settings },
})
return { success : true }
}
Error Handling Issue Cause Solution Middleware redirect loop Sign-in page not in isPublicRoute Add /sign-in(.*) to public route matcher 401 on API route Token not forwarded Include credentials in fetch or use server-side auth() orgId is nullNo active organization Prompt user with <OrganizationSwitcher /> has() always falsePermission not assigned to role Check Dashboard > Organizations > Roles Session expired Token TTL exceeded Clerk auto-refreshes; if stuck, clear cookies auth() was called but clerkMiddleware() not detectedMiddleware missing or wrong location Ensure middleware.ts at project root
Enterprise Considerations
Session token v2 (default since April 2025) is more compact -- if your downstream services parse JWTs, verify they handle the new format
auth.protect() in middleware returns a 401/redirect before reaching your route handler -- this is more efficient than checking userId in every routeFor permission-based access, prefer has({ permission: '...' }) over has({ role: '...' }) -- permissions decouple authorization from role names
JWT templates support custom iss, aud, and exp claims for integrating with Hasura, Supabase, Convex, Neon, and other services
Organization switching changes the active session scope instantly -- no page reload needed
Resources
Next Steps Proceed to clerk-webhooks-events for webhook and event handling.
