Full-Stack Deployment

Full-stack deployment coordinates static assets, server code, databases, environment variables, and sometimes background workers. A release can fail even when each piece builds alone if the pieces are deployed in the wrong order.

Release Order

A common safe sequence is:

Deploy backward-compatible backend code.
Run database migrations.
Deploy frontend that uses the new API.
Monitor errors and latency.
Remove old compatibility code later.

This avoids deploying a frontend that calls endpoints production does not understand yet.

Cross-Origin Configuration

const allowedOrigins = new Set([
  "https://app.example.com",
  "https://staging.example.com",
]);

function isAllowedOrigin(origin: string | null) {
  return origin !== null && allowedOrigins.has(origin);
}

Cookies, CORS, and redirects must match the deployed domains. A login flow that works locally can fail in production if cookie domain, SameSite, Secure, or CORS headers are wrong.

WARNING

Avoid wildcard CORS with credentials. It weakens the browser boundary and often masks incorrect environment configuration.

Further Learning

Search these terms to go deeper:

“backward compatible API deployment” — ordering frontend and backend releases
“CORS credentials cookies production” — browser security configuration
“database migration deploy order” — schema changes without downtime
“frontend backend rollback strategy” — reversing multi-part releases

Full-Stack Deployment

Deploying a full-stack app means coordinating several moving pieces at once — frontend, backend, database changes — and the order you deploy them in matters. Get it wrong, and a shiny new frontend can call an API endpoint that doesn’t exist yet.

The safe release order

A dependable sequence:

Deploy backend code that still works with the old database schema and the new one (backward-compatible).
Run database migrations.
Deploy the frontend that uses the new API.
Watch for errors.
Clean up any old compatibility code later.

This way, there’s never a moment where the frontend expects something the backend can’t yet provide.

Make sure cookies and CORS match your real domains

A login that works perfectly on your laptop can break in production if the cookie/CORS settings don’t match your actual deployed domain:

const allowedOrigins = new Set([
  'https://app.example.com',
  'https://staging.example.com',
])

WARNING

Avoid allowing “any origin” (*) for requests that include cookies/credentials — it weakens your security boundary and often just masks a misconfiguration you should actually fix.

Verify it’s actually healthy

After deploying, check that your health-check endpoint responds correctly before assuming everything’s fine. And know your rollback plan before you need it — for both the frontend and backend.

In one sentence

Deploy full-stack changes in a safe order (backward-compatible backend → migrations → frontend), make sure cookie/CORS settings match your real production domains, and verify health checks after every release.

Want to go deeper?

Switch to Expert mode above for zero-downtime migration ordering and rollback strategies for multi-part releases.