Server Actions & Form Mutations without API Endpoints

Server Actions in Next.js 15

// app/actions/create-course.ts
'use server';

import { revalidatePath } from 'next/cache';

export async function addCourse(formData: FormData) {
    const title = formData.get('title');
    // Direct database write on the server!
    await db.course.create({ data: { title } });
    revalidatePath('/courses');
}