Next.js 15 Server Actions

Server Actions in Next.js 15 provide a powerful way to handle form submissions and database writes directly without building intermediate API controllers. However, securing these endpoints requires deep architectural discipline.

1. Direct Argument Verification

Always validate the parameters passed to Server Actions using structural schemas (like Zod).

// Define action schema
const InquirySchema = z.object({
  email: z.string().email(),
  details: z.string().min(10)
});

Never trust client inputs without sanitization.