diff --git a/src/domain/card-schemas.ts b/src/domain/card-schemas.ts
new file mode 100644
index 0000000..a52c7ed
--- /dev/null
+++ b/src/domain/card-schemas.ts
@@ -0,0 +1,10 @@
+import { z } from 'zod'
+
+export const createCardSchema = z.object({
+  question: z.string().trim().min(1, 'La question est requise').max(1000, 'Question trop longue'),
+  response: z.string().trim().min(1, 'La réponse est requise').max(2000, 'Réponse trop longue'),
+  theme: z.string().trim().min(1, 'Le thème est requis').max(50, 'Thème trop long'),
+  tags: z.array(z.string().trim().min(1, 'Tag vide')).max(50, 'Trop de tags').optional(),
+})
+
+export const updateCardSchema = createCardSchema.partial()
\ No newline at end of file
diff --git a/src/domain/errors.ts b/src/domain/errors.ts
new file mode 100644
index 0000000..05e7cbc
--- /dev/null
+++ b/src/domain/errors.ts
@@ -0,0 +1,21 @@
+export class AppError extends Error {
+  constructor(
+    public readonly status: number,
+    message: string,
+  ) {
+    super(message)
+    this.name = new.target.name
+  }
+}
+
+export class NotFoundError extends AppError {
+  constructor(message: string) {
+    super(404, message)
+  }
+}
+
+export class ValidationError extends AppError {
+  constructor(message: string) {
+    super(400, message)
+  }
+}
\ No newline at end of file