Clerk multi env setup

Clerk Multi-Environment Setup

Overview

Configure Clerk across development, staging, and production environments with separate instances, environment-aware configuration, and safe promotion workflows.

Prerequisites

• Clerk account (one instance per environment recommended)
• CI/CD pipeline (GitHub Actions, Vercel, etc.)
• Environment variable management in place

Instructions

Step 1: Create Clerk Instances

Create separate Clerk instances in the Dashboard for each environment:

Environment	Instance	Key Prefix	Domain
Development	my-app-dev	pk_test_ / sk_test_	localhost:3000
Staging	my-app-staging	pk_test_ / sk_test_	staging.myapp.com
Production	my-app-prod	pk_live_ / sk_live_	myapp.com

Step 2: Environment Configuration Files

# .env.local (development - git-ignored)
NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY=pk_test_dev...
CLERK_SECRET_KEY=sk_test_dev...
CLERK_WEBHOOK_SECRET=whsec_dev...

# .env.staging (staging)
NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY=pk_test_staging...
CLERK_SECRET_KEY=sk_test_staging...
CLERK_WEBHOOK_SECRET=whsec_staging...

# .env.production (production)
NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY=pk_live_prod...
CLERK_SECRET_KEY=sk_live_prod...
CLERK_WEBHOOK_SECRET=whsec_prod...

Step 3: Environment-Aware Configuration

// lib/clerk-config.ts
type ClerkEnv = 'development' | 'staging' | 'production'

function getClerkEnv(): ClerkEnv {
  const key = process.env.NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY || ''
  if (key.startsWith('pk_live_')) return 'production'
  if (process.env.VERCEL_ENV === 'preview') return 'staging'
  return 'development'
}

export const clerkConfig = {
  env: getClerkEnv(),
  get isDev() { return this.env === 'development' },
  get isProd() { return this.env === 'production' },

  signInUrl: '/sign-in',
  signUpUrl: '/sign-up',
  afterSignInUrl: '/dashboard',

  get allowedRedirectOrigins() {
    switch (this.env) {
      case 'production': return ['https://myapp.com']
      case 'staging': return ['https://staging.myapp.com']
      default: return ['http://localhost:3000']
    }
  },
}

Step 4: Startup Validation

// lib/validate-env.ts
export function validateClerkEnv() {
  const required = [
    'NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY',
    'CLERK_SECRET_KEY',
  ]

  const missing = required.filter((key) => !process.env[key])
  if (missing.length > 0) {
    throw new Error(`Missing Clerk env vars: ${missing.join(', ')}`)
  }

  const pk = process.env.NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY!
  const sk = process.env.CLERK_SECRET_KEY!

  // Prevent key mismatch (test keys with live keys)
  const pkIsLive = pk.startsWith('pk_live_')
  const skIsLive = sk.startsWith('sk_live_')
  if (pkIsLive !== skIsLive) {
    throw new Error('Clerk key mismatch: publishable and secret keys must be from same environment')
  }

  // Warn if using live keys in development
  if (pkIsLive && process.env.NODE_ENV === 'development') {
    console.warn('WARNING: Using production Clerk keys in development mode')
  }
}

Call at app startup:

// app/layout.tsx
import { validateClerkEnv } from '@/lib/validate-env'
validateClerkEnv()

Step 5: Webhook Configuration Per Environment

// app/api/webhooks/clerk/route.ts
import { headers } from 'next/headers'
import { Webhook } from 'svix'

export async function POST(req: Request) {
  // Each environment uses its own webhook secret
  const secret = process.env.CLERK_WEBHOOK_SECRET
  if (!secret) {
    console.error('CLERK_WEBHOOK_SECRET not configured for this environment')
    return new Response('Server error', { status: 500 })
  }

  // Verification logic (same across environments)
  const headerPayload = await headers()
  const wh = new Webhook(secret)
  const body = await req.text()

  try {
    const evt = wh.verify(body, {
      'svix-id': headerPayload.get('svix-id')!,
      'svix-timestamp': headerPayload.get('svix-timestamp')!,
      'svix-signature': headerPayload.get('svix-signature')!,
    })
    // Handle event...
    return new Response('OK', { status: 200 })
  } catch {
    return new Response('Invalid signature', { status: 400 })
  }
}

Step 6: CI/CD Environment Promotion

# .github/workflows/deploy.yml
name: Deploy
on:
  push:
    branches: [main, staging]

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Set environment
        run: |
          if [[ "${{ github.ref }}" == "refs/heads/main" ]]; then
            echo "DEPLOY_ENV=production" >> $GITHUB_ENV
          else
            echo "DEPLOY_ENV=staging" >> $GITHUB_ENV
          fi

      - name: Deploy to Vercel
        env:
          NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY: ${{ secrets[format('CLERK_PK_{0}', env.DEPLOY_ENV)] }}
          CLERK_SECRET_KEY: ${{ secrets[format('CLERK_SK_{0}', env.DEPLOY_ENV)] }}
        run: vercel deploy --prod

Output

• Separate Clerk instances per environment (dev, staging, production)
• Environment-aware configuration with key validation
• Startup checks preventing key mismatches
• Per-environment webhook secrets
• CI/CD pipeline deploying correct keys per branch

Error Handling

Error	Cause	Solution
Key mismatch error	pk_test_ with sk_live_	Ensure both keys from same Clerk instance
Webhook signature fails	Wrong secret for environment	Verify CLERK_WEBHOOK_SECRET matches instance
User not found	Querying wrong environment	Check you are hitting correct Clerk instance
OAuth redirect fails	Domain not configured	Add environment domain in Clerk Dashboard

Examples

Vercel Preview Environment Setup

# Set env vars for Vercel preview deployments
vercel env add NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY preview
vercel env add CLERK_SECRET_KEY preview

Resources

• Clerk Deployment Environments
• Preview Environment Setup
• Vercel Environment Variables

Next Steps

Proceed to clerk-observability for monitoring and logging.