diff --git a/src/models/PostModel.ts b/src/models/PostModel.ts
new file mode 100644
index 0000000..9ae493e
--- /dev/null
+++ b/src/models/PostModel.ts
@@ -0,0 +1,19 @@
+import { z } from 'zod';
+
+interface Post {
+  id: number;
+  title: string;
+  content?: string | undefined;
+  picture?: string | undefined;
+  authorId: number;
+}
+
+const Post: z.ZodType<Post> = z.object({
+  id: z.number(),
+  title: z.string(),
+  content: z.string().optional(),
+  picture: z.string().optional(),
+  authorId: z.number(),
+});
+
+export { Post };
diff --git a/src/models/UserModel.ts b/src/models/UserModel.ts
index 566a132..5a3e4bb 100644
--- a/src/models/UserModel.ts
+++ b/src/models/UserModel.ts
@@ -1,13 +1,24 @@
 import { z } from 'zod';
+import { Post } from './PostModel';
 
-const UserModel = z.object({
-  id: z.string().optional(),
+interface User {
+  id?: number | undefined;
+  email: string;
+  password: string;
+  firstName: string;
+  lastName: string;
+  role?: string | undefined;
+  posts?: Post[] | undefined;
+}
+
+const User: z.ZodType<User> = z.object({
+  id: z.number().optional(),
   email: z.string().email(),
   password: z.string(),
-  firstname: z.string(),
-  lastname: z.string(),
-  role: z.string().default('user'),
-  posts: z.array(z.string()).optional(),
+  firstName: z.string(),
+  lastName: z.string(),
+  role: z.string().optional(),
+  posts: z.array(Post).optional(),
 });
 
-export default UserModel;
+export { User };