deployment-guide

To deploy a Next.js and NestJS app, you configure Next.js for Vercel and NestJS for Railway using environment variables, platform-specific build settings, and health checks to ensure a repeatable, production-ready deployment workflow.

Next.js and NestJS deployment requires managing NEXT_PUBLIC_* variables for frontend exposure alongside secret backend variables, synchronizing them across Vercel, Railway, or Fly.io to maintain consistent application behavior across platforms.

Configuring NestJS health checks on Railway or Fly.io involves defining readiness probes and health-check endpoints in your deployment configuration to verify service availability and support zero-downtime deployment practices.

Yes, you can use Fly.io instead of Railway for your NestJS backend deployment, as the workflow supports both platforms by applying consistent environment management, health checks, and multi-platform deployment configurations.

The best way to achieve zero-downtime deployment for a Next.js frontend is applying vercel.json production configurations alongside synchronized environment variables and verified health checks to align builds and deploys without service interruption.

NestJS deployment environment synchronization on Railway fails when secret variables or health-check endpoints are misconfigured, requiring strict alignment of readiness probes and environment variables to pass verification checks.