diff --git a/src/models/entities/Auth.ts b/src/models/entities/Auth.ts
index 75ed27c..39a16ef 100644
--- a/src/models/entities/Auth.ts
+++ b/src/models/entities/Auth.ts
@@ -1,3 +1,5 @@
+import { IsInt, IsString } from 'class-validator';
+
 /**
  * Defines a auth object
 */
@@ -5,17 +7,21 @@ export class Auth {
   /**
   * access_token - JWT shortterm access token
   */
+  @IsString()
   access_token: string;
   /**
   * refresh_token - longterm refresh token (used for requesting new access tokens)
   */
+  @IsString()
   refresh_token: string;
   /**
   * access_token_expires_at - unix timestamp of access token expiry
   */
+  @IsInt()
   access_token_expires_at: number;
   /**
   * refresh_token_expires_at - unix timestamp of access token expiry
   */
+  @IsInt()
   refresh_token_expires_at: number;
 }