diff --git a/hw4/src/data/categories.json b/hw4/src/data/categories.json
new file mode 100644
index 0000000..e2bf991
--- /dev/null
+++ b/hw4/src/data/categories.json
@@ -0,0 +1,14 @@
+[
+    {
+        "id" : "1",
+        "name" : "Toys"
+    },
+    {
+        "id" : "2",
+        "name" : "Fruites"
+    },
+    {
+        "id" : "3",
+        "name" : "Clothes"
+    }
+]
\ No newline at end of file
diff --git a/hw4/src/index.ts b/hw4/src/index.ts
index 644ccea..3f44080 100644
--- a/hw4/src/index.ts
+++ b/hw4/src/index.ts
@@ -1,6 +1,7 @@
 import express from 'express';
 import cors from 'cors';
 import { router as productsRouter } from './routes/products';
+import { router as categoriesRouter } from './routes/category';
 
 const app = express();
 
@@ -10,6 +11,7 @@ app.use(cors());
 app.get('/hello', (req, res) => res.send('hello back'));
 
 app.use('/api/products', productsRouter);
+app.use('/api/category', categoriesRouter);
 
 app.set('port', process.env.PORT || 8000);
 
diff --git a/hw4/src/models/ICategory.ts b/hw4/src/models/ICategory.ts
new file mode 100644
index 0000000..3313b7e
--- /dev/null
+++ b/hw4/src/models/ICategory.ts
@@ -0,0 +1,4 @@
+export interface ICategory {
+  id: string;
+  name: string;
+}
diff --git a/hw4/src/models/products.ts b/hw4/src/models/IProducts.ts
similarity index 73%
rename from hw4/src/models/products.ts
rename to hw4/src/models/IProducts.ts
index 9f297df..cfa3871 100644
--- a/hw4/src/models/products.ts
+++ b/hw4/src/models/IProducts.ts
@@ -1,4 +1,4 @@
-export interface Product {
+export interface IProduct {
   id: string;
   categoryId: string;
   name: string;
diff --git a/hw4/src/routes/category.ts b/hw4/src/routes/category.ts
new file mode 100644
index 0000000..afb5dce
--- /dev/null
+++ b/hw4/src/routes/category.ts
@@ -0,0 +1,87 @@
+import { NextFunction, Request, Response, Router } from 'express';
+import { generateId } from '../utils/id-helper';
+import * as handlers from '../utils/common';
+import { ICategory } from '../models/ICategory';
+import { IProduct } from '../models/IProducts';
+import { getCatrgories } from '../store/categories-store';
+import { getProducts } from '../store/products-store';
+
+const router = Router();
+
+const categories: ICategory[] = getCatrgories();
+const products: IProduct[] = getProducts();
+
+const resolveCategoryHandler = (req: Request, res: Response, next: NextFunction): void => {
+  console.log('enter resolveCategoryHandler');
+  const categoryId = req.params.id;
+  if (!handlers.isValidUuid(categoryId)) {
+    res.sendStatus(400);
+    return;
+  }
+
+  const categoryIndex = categories.findIndex((category) => category.id === categoryId);
+  if (categoryIndex < 0) {
+    res.sendStatus(404);
+    return;
+  }
+  res.locals.categoryIndex = categoryIndex;
+  res.locals.category = categories[categoryIndex];
+  next();
+};
+
+router.get('/', (req, res) => {
+  console.log('enter route.get(/)');
+
+  res.send(categories);
+});
+
+router.get('/:id/products', resolveCategoryHandler, (req, res) => {
+  console.log('enter route.get(/:id/products)');
+
+  const category = req.body as ICategory;
+  const productsForCategory: IProduct[] = [];
+
+  products.forEach((p) => {
+    if (p.categoryId === category.id) productsForCategory.push(p);
+  });
+
+  res.send(productsForCategory);
+});
+
+router.get('/:id', resolveCategoryHandler, (req, res) => {
+  console.log('enter route.get(/:id)');
+
+  const category = req.body as ICategory;
+
+  res.send(category);
+});
+
+router.post('/', handlers.validateNameHandler, (req, res) => {
+  console.log('enter route.post(/)');
+
+  const category = req.body as ICategory;
+  category.id = generateId();
+  categories.push(category);
+
+  res.status(201).send(category);
+});
+
+router.put('/:id', handlers.validateNameHandler, resolveCategoryHandler, (req, res) => {
+  console.log('enter route.put(/:id)');
+
+  const category = req.body as ICategory;
+  category.id = res.locals.category.id;
+  Object.assign(res.locals.category, category);
+
+  res.send(categories);
+});
+
+router.delete('/:id', resolveCategoryHandler, (req, res) => {
+  console.log('enter route.delete(/:id)');
+
+  categories.splice(res.locals.categoryIndex, 1);
+
+  res.sendStatus(204);
+});
+
+export { router };
diff --git a/hw4/src/routes/products.ts b/hw4/src/routes/products.ts
index 0a8a8d5..e348664 100644
--- a/hw4/src/routes/products.ts
+++ b/hw4/src/routes/products.ts
@@ -1,12 +1,11 @@
 import { NextFunction, Request, Response, Router } from 'express';
 import { generateId } from '../utils/id-helper';
-import productsData from '../data/products.json';
 import * as handlers from '../utils/common';
-import { Product } from '../models/products';
-
-const products: Product[] = productsData;
+import { IProduct } from '../models/IProducts';
+import { getProducts } from '../store/products-store';
 
 const router = Router();
+const products: IProduct[] = getProducts();
 
 const resolveProductHandler = (req: Request, res: Response, next: NextFunction): void => {
   console.log('enter resolveProductHandler');
@@ -34,14 +33,14 @@ router.get('/', (req, res) => {
 
 router.get('/:id', resolveProductHandler, (req, res) => {
   console.log('enter route.get(/:id)');
-  const product = req.body as Product;
+  const product = req.body as IProduct;
 
   res.send(product);
 });
 
 router.post('/', handlers.validateNameHandler, (req, res) => {
   console.log('enter route.post(/)');
-  const product = req.body as Product;
+  const product = req.body as IProduct;
   product.id = generateId();
   products.push(product);
 
@@ -50,7 +49,7 @@ router.post('/', handlers.validateNameHandler, (req, res) => {
 
 router.put('/:id', handlers.validateNameHandler, resolveProductHandler, (req, res) => {
   console.log('enter route.put(/:id)');
-  const product = req.body as Product;
+  const product = req.body as IProduct;
   product.id = res.locals.product.id;
   Object.assign(res.locals.product, product);
 
diff --git a/hw4/src/store/categories-store.ts b/hw4/src/store/categories-store.ts
new file mode 100644
index 0000000..dc826eb
--- /dev/null
+++ b/hw4/src/store/categories-store.ts
@@ -0,0 +1,10 @@
+import { ICategory } from '../models/ICategory';
+import categoriesData from '../data/categories.json';
+
+export function getCatrgories(): ICategory[] {
+  return categoriesData;
+}
+
+export function getCatrgoriesAsync(): Promise<ICategory[]> {
+  return Promise.resolve(getCatrgories());
+}
diff --git a/hw4/src/store/products-store.ts b/hw4/src/store/products-store.ts
new file mode 100644
index 0000000..c15f85e
--- /dev/null
+++ b/hw4/src/store/products-store.ts
@@ -0,0 +1,10 @@
+import { IProduct } from '../models/IProducts';
+import productsData from '../data/products.json';
+
+export function getProducts(): IProduct[] {
+  return productsData;
+}
+
+export function getProductsAsync(): Promise<IProduct[]> {
+  return Promise.resolve(getProducts());
+}