diff --git a/src/controllers/user.js b/src/controllers/user.js
index b1a5286..330068a 100644
--- a/src/controllers/user.js
+++ b/src/controllers/user.js
@@ -8,6 +8,7 @@ import CategoryService from '../services/category.js';
 import translate from '../utils/translate.js';
 import responseCodes from '../response/responseCodes.js';
 import customError from '../response/customError.js';
+import { createHash } from 'crypto';
 
 const TAG = "/controllers/userjs"
 
@@ -36,8 +37,22 @@ class UserController {
 
         let result = {};
         result.abstract_products = await AbstractProductService.getAll(groupId);
+        result.abstract_products.forEach((abstractproduct) => {
+            let data = `${abstractproduct.local_id}:${abstractproduct.barcode}:${abstractproduct.name}:${abstractproduct.net_weight}:${abstractproduct.image_filename}:${abstractproduct.category}:${abstractproduct.unit}`
+            abstractproduct.hash = createHash('md5').update(data).digest('hex');
+        });
+
         result.products = await ProductService.getAll(groupId);
+        result.products.forEach((product) => {
+            let data = `${product.local_id}:${product.abstract_product_id}:${product.amount}:${new Date(product.date_of_production).valueOf() / 1000}:${new Date(product.expiry_date).valueOf() / 1000}`
+            product.hash = createHash('md5').update(data).digest('hex');
+        });
+
         result.categories = await CategoryService.getAll(groupId);
+        result.categories.forEach((category) => {
+            let data = `${category.local_id}:${category.name}`
+            category.hash = createHash('md5').update(data).digest('hex');
+        });
 
         return res.status(200).send(result);
     }