Top 10 Tips for Deploying Full Stack Applications on Vercel and AWS

Deploying a full stack application can be complex: frontend, backend, database, and environment variables all need to work together. Vercel excels for React and Next.js frontends; AWS offers flexibility for backends and databases. Here are 10 tips to deploy smoothly.

1. Use Environment Variables Correctly

Never commit secrets. Use .env locally and set variables in Vercel/AWS dashboards. In Vercel: Settings → Environment Variables. In AWS: use Parameter Store or Secrets Manager. Prefix frontend vars with REACT_APP_ or VITE_ for client exposure.

2. Separate Frontend and Backend Deployments

Deploy frontend (Vercel) and backend (AWS Elastic Beanstalk, EC2, or Lambda) separately. Point frontend to backend API URL via environment variable. This allows independent scaling and rollbacks.

3. Enable CORS on the Backend

Configure CORS to allow your Vercel frontend domain. Use cors({ origin: process.env.FRONTEND_URL }) in Express. Add Access-Control-Allow-Credentials: true if using cookies.

4. Set Up CI/CD

Vercel auto-deploys from Git. For AWS, use GitHub Actions or AWS CodePipeline. Run tests before deploy. Use staging environment for pre-production testing.

5. Use HTTPS Everywhere

Vercel provides HTTPS by default. On AWS, use ACM (Certificate Manager) for free SSL. Always redirect HTTP to HTTPS.

6. Optimize Build Output

Set correct build command and output directory. For React: npm run build, output build. For Next.js, Vercel auto-detects. Minify and tree-shake for production.

7. Database Considerations

Use MongoDB Atlas or AWS RDS. Whitelist deploy IPs or use 0.0.0.0/0 for serverless. Use connection pooling for high traffic.

8. Monitor and Log

Use Vercel Analytics and AWS CloudWatch. Set up error tracking (e.g., Sentry). Monitor response times and error rates.

9. Use CDN for Static Assets

Vercel includes a global CDN. On AWS, use CloudFront in front of S3 for static files. Cache aggressively for performance.

10. Plan for Rollbacks

Keep previous deployments. Vercel keeps deployment history. On AWS, use blue-green or canary deployments for zero-downtime rollbacks.

Need help deploying your full stack app? Contact me—I deploy MERN, React, and Node.js applications for businesses.