API Design - Next.js 16

To separate Server Actions from API Routes in Next.js 16, apply a server actions-first pattern for internal operations and isolate external endpoints using reusable templates for validation, error handling, and response types.

The best way to structure webhooks and public API endpoints in Next.js is to enforce clear separation from internal app logic, applying rate limiting, authentication, and input validation through standardized response patterns.

Add input validation and error handling to Next.js 16 API Routes by applying reusable templates that enforce consistent response types and standardize error handling across both internal workflows and external endpoints.

Server Actions are designed for internal operations within Next.js 16. For external API workflows and webhooks, you should use dedicated API Routes to ensure proper authentication, rate limiting, and public endpoint security.

Coordinating Server Actions with API Routes becomes hard to maintain in Next.js without a clear pattern, leading to error-prone logic placement and inconsistent response types across internal workflows and external endpoints.