diff --git a/app.js b/app.js
index d4376c3..09d1f79 100644
--- a/app.js
+++ b/app.js
@@ -1,5 +1,7 @@
 const express = require('express');
 const tasksRouter = require('./routes/tasks');
+const categoriesRouter = require('./routes/categories');
+const notesRouter = require('./routes/notes');
 
 const app = express();
 const PORT = process.env.PORT || 3000;
@@ -11,6 +13,8 @@ app.get('/health', (req, res) => {
 });
 
 app.use('/tasks', tasksRouter);
+app.use('/categories', categoriesRouter);
+app.use('/notes', notesRouter);
 
 app.listen(PORT, () => {
   console.log(`Server running on port ${PORT}`);
diff --git a/routes/categories.js b/routes/categories.js
new file mode 100644
index 0000000..383d03d
--- /dev/null
+++ b/routes/categories.js
@@ -0,0 +1,58 @@
+var express = require('express');
+var router = express.Router();
+
+var categories = [];
+var nextId = 1;
+
+// get all categories
+router.get('/', function(req, res) {
+  res.json(categories);
+});
+
+// get single category
+router.get('/:id', function(req, res) {
+  var category = categories.find(function(c) { return c.id == req.params.id; });
+  if (!category) {
+    res.status(404).json({ message: 'not found' });
+    return;
+  }
+  res.json(category);
+});
+
+// create category
+router.post('/', function(req, res) {
+  var category = {
+    id: nextId++,
+    name: req.body.name,
+    description: req.body.description,
+    color: req.body.color
+  };
+  categories.push(category);
+  res.json(category);
+});
+
+// update category
+router.patch('/:id', function(req, res) {
+  var category = categories.find(function(c) { return c.id == req.params.id; });
+  if (!category) {
+    res.status(404).json({ message: 'not found' });
+    return;
+  }
+  if (req.body.name) category.name = req.body.name;
+  if (req.body.description) category.description = req.body.description;
+  if (req.body.color) category.color = req.body.color;
+  res.json(category);
+});
+
+// delete category
+router.delete('/:id', function(req, res) {
+  var index = categories.findIndex(function(c) { return c.id == req.params.id; });
+  if (index === -1) {
+    res.status(404).json({ message: 'not found' });
+    return;
+  }
+  categories.splice(index, 1);
+  res.json({ message: 'deleted' });
+});
+
+module.exports = router;