Type-Safe Route Handlers in Next.js
Build Next.js Route Handlers around unknown request data, runtime schemas, authenticated operations, deliberate response types, and precise HTTP status behavior.
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Production patterns for React, Next.js App Router, TypeScript, component systems, and data flows.
Start with the pillar guide: Next.js Caching and Revalidation Explained
Build Next.js Route Handlers around unknown request data, runtime schemas, authenticated operations, deliberate response types, and precise HTTP status behavior.
Place App Router loading and error boundaries around useful regions, distinguish expected failures, and use version-correct recovery behavior for Next.js 16.2.
Place Next.js authentication, session verification, record authorization, and public projections in a server data layer while keeping proxy redirects as navigation aids.
Build Next.js forms with validated Server Actions, server-side authorization, structured field errors, pending UI, and an explicit policy for duplicate submissions.
Model React props with discriminated unions, native element types, explicit children, and controlled state so impossible component combinations fail at compile time.
Understand Next.js cache scopes, explicit public fetch caching, tag and path invalidation, stale-while-revalidate, and read-your-writes in version 16.
Load App Router data on the server, start independent work in parallel, validate responses, and place streaming boundaries without adding unnecessary HTTP hops.
Place React Server and Client Component boundaries by execution needs, imported dependencies, serializable props, and interactive state in the Next.js App Router.
Organize App Router routes, feature modules, server-only data access, and shared UI so that a new developer can follow one request without a generic folder maze.