Building a Type-Safe API Layer in Next.js App Router With Zod and Server Actions

Short summary

Pattern for building type-safe Next.js Server Actions with Zod validation and discriminated unions. Wraps all results in ActionResult<T> (success | error), validates input at runtime despite TypeScript, and handles field errors. Ensures type safety and consistent error handling across the client-server boundary.

• •Use discriminated union pattern (ActionResult<T>) for all Server Action returns
• •Validate input with Zod at runtime even with TypeScript type definitions
• •Integrate field-level errors with React Hook Form for consistent client UX

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