Clerk Deploy Integration

Overview

Deploy Clerk-authenticated applications to Vercel, Netlify, Railway, and other hosting platforms. Covers environment variable configuration, domain setup, and webhook endpoint configuration.

Prerequisites

• Clerk production instance with pk_live_ / sk_live_ keys
• Production domain configured
• Hosting platform account

Instructions

Step 1: Vercel Deployment

# Add Clerk env vars to Vercel
vercel env add NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY production
# Paste: pk_live_...
vercel env add CLERK_SECRET_KEY production
# Paste: sk_live_...
vercel env add CLERK_WEBHOOK_SECRET production
# Paste: whsec_...

# Add for preview deployments too
vercel env add NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY preview
vercel env add CLERK_SECRET_KEY preview

Configure Clerk Dashboard for Vercel:

1. Go to Dashboard > Domains and add your production domain
2. Set Home URL: https://myapp.com
3. Set Sign-in URL: https://myapp.com/sign-in
4. Set Sign-up URL: https://myapp.com/sign-up
5. Set After sign-in URL: https://myapp.com/dashboard

Step 2: Netlify Deployment

# Add env vars via Netlify CLI
netlify env:set NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY pk_live_...
netlify env:set CLERK_SECRET_KEY sk_live_...

For Netlify Functions (serverless API routes):

// netlify/functions/clerk-auth.ts
import { createClerkClient } from '@clerk/backend'

const clerk = createClerkClient({ secretKey: process.env.CLERK_SECRET_KEY! })

export async function handler(event: any) {
  const token = event.headers.authorization?.replace('Bearer ', '')
  if (!token) {
    return { statusCode: 401, body: JSON.stringify({ error: 'No token' }) }
  }

  try {
    const session = await clerk.sessions.verifySession(token, token)
    return {
      statusCode: 200,
      body: JSON.stringify({ userId: session.userId }),
    }
  } catch {
    return { statusCode: 401, body: JSON.stringify({ error: 'Invalid token' }) }
  }
}

Step 3: Railway Deployment

# Set env vars via Railway CLI
railway variables set NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY=pk_live_...
railway variables set CLERK_SECRET_KEY=sk_live_...
railway variables set CLERK_WEBHOOK_SECRET=whsec_...

Step 4: Docker Deployment

# Dockerfile
FROM node:20-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
# Build-time env vars (public key only)
ARG NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY
ENV NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY=$NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY
RUN npm run build

FROM node:20-alpine AS runner
WORKDIR /app
COPY --from=builder /app/.next/standalone ./
COPY --from=builder /app/.next/static ./.next/static
COPY --from=builder /app/public ./public
# Runtime env vars (secret key injected at runtime, not baked into image)
# CLERK_SECRET_KEY set via docker run -e or docker-compose
EXPOSE 3000
CMD ["node", "server.js"]

# docker-compose.yml
services:
  app:
    build:
      context: .
      args:
        NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY: pk_live_...
    environment:
      - CLERK_SECRET_KEY=sk_live_...
      - CLERK_WEBHOOK_SECRET=whsec_...
    ports:
      - "3000:3000"

Step 5: Post-Deployment Verification

#!/bin/bash
# scripts/verify-deployment.sh
set -euo pipefail

DOMAIN="${1:-https://myapp.com}"

echo "Checking deployment at $DOMAIN..."

# 1. Homepage loads
STATUS=$(curl -s -o /dev/null -w "%{http_code}" "$DOMAIN")
echo "Homepage: HTTP $STATUS"

# 2. Sign-in page accessible
STATUS=$(curl -s -o /dev/null -w "%{http_code}" "$DOMAIN/sign-in")
echo "Sign-in: HTTP $STATUS"

# 3. Health check (if implemented)
curl -s "$DOMAIN/api/clerk-health" | python3 -m json.tool 2>/dev/null || echo "No health endpoint"

# 4. Webhook endpoint reachable
STATUS=$(curl -s -o /dev/null -w "%{http_code}" -X POST "$DOMAIN/api/webhooks/clerk")
echo "Webhook endpoint: HTTP $STATUS (400/405 expected without valid payload)"

Output

• Platform-specific environment variables configured
• Clerk Dashboard domains and URLs set for production
• Docker multi-stage build with proper secret handling
• Post-deployment verification script
• Webhook endpoint accessible at production URL

Error Handling

Error	Cause	Solution
500 on sign-in page	Missing CLERK_SECRET_KEY	Add secret key to platform env vars
Webhook signature fails	Wrong endpoint URL	Update URL in Clerk Dashboard > Webhooks
CORS error	Domain not in allowed origins	Add production domain in Clerk Dashboard > Domains
Redirect loop after deploy	Sign-in URL misconfigured	Check NEXT_PUBLIC_CLERK_SIGN_IN_URL matches route
Docker build missing PK	Not passed as build arg	Add --build-arg NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY=...

Examples

Vercel Preview Deployment with Clerk

# Configure Clerk for Vercel preview deployments
# Use test keys for preview, live keys for production
vercel env add NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY preview  # pk_test_...
vercel env add CLERK_SECRET_KEY preview                    # sk_test_...
vercel env add NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY production  # pk_live_...
vercel env add CLERK_SECRET_KEY production                   # sk_live_...

Resources

• Deploy to Vercel
• Deploy to Netlify
• Clerk Domain Configuration

Next Steps

Proceed to clerk-webhooks-events for webhook configuration.