Server-Side Rendered Web App (Next.js) on Cloud

Server-Side Rendered Web App (Next.js) on Cloud

Server-side rendering (SSR) generates HTML for each request on the server, then hydrates it into an interactive single-page app in the browser. Next.js combines SSR, static generation, and React Server Components in one framework. Choose this design when pages need fresh, per-user, or SEO-critical content and a fast first paint: storefronts, dashboards, and authenticated content sites. It runs here on AWS managed compute.

Components

• Next.js: the application framework handling routing, rendering, and data fetching.
• Container runtime (ECS Fargate or App Runner): runs the Node.js server without managing servers.
• CDN (CloudFront): caches static assets and rendered pages, and terminates TLS at the edge.
• Redis (ElastiCache): caches sessions, rendered fragments, and hot query results.
• PostgreSQL (RDS or Aurora): the relational system of record.
• Load balancer (ALB): distributes traffic and runs health checks.
• Object storage (S3): stores user uploads and build assets.

Data Flow

A request hits CloudFront. Cacheable pages return immediately; others pass to the ALB and on to a Fargate task. Next.js fetches data from PostgreSQL and Redis, renders HTML, and streams it back. The browser hydrates and makes follow-up API calls. Mutations write through to PostgreSQL and invalidate affected caches. Incremental static regeneration refreshes popular pages in the background.

Scaling and Resilience

Fargate scales horizontally on CPU and request count; the ALB spreads load and ejects unhealthy tasks. CloudFront offloads static and cacheable traffic so the origin handles fewer requests. Aurora provides read replicas for read-heavy pages. Run across multiple Availability Zones and use rolling or blue-green deployments for zero-downtime releases. Track Core Web Vitals and origin latency as primary signals.

Security

Terminate TLS 1.3 at CloudFront and set a strict Content Security Policy and secure headers. Place compute in private subnets reachable only through the ALB. Store database credentials in a secrets manager and connect over TLS. Apply least-privilege IAM roles per task. Add a web application firewall and rate limiting in front of the CDN.

Trade-offs and Alternatives

SSR costs more compute than static hosting and adds latency on cache misses, so cache aggressively. For mostly static content, Jamstack is cheaper. For globally distributed dynamic rendering, edge SSR moves work closer to users at the price of tighter runtime limits. Next.js couples you to React; teams standardized on Vue or Angular have equivalent SSR frameworks.