diff --git a/.github/workflows/lint-php-cs.yml b/.github/workflows/lint-php-cs.yml
new file mode 100644
index 0000000..d4288fb
--- /dev/null
+++ b/.github/workflows/lint-php-cs.yml
@@ -0,0 +1,40 @@
+# This workflow is provided via the organization template repository
+#
+# https://github.com/nextcloud/.github
+# https://docs.github.com/en/actions/learn-github-actions/sharing-workflows-with-your-organization
+
+name: Lint php-cs
+
+on: pull_request
+
+permissions:
+  contents: read
+
+concurrency:
+  group: lint-php-cs-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    runs-on: self-hosted
+
+    name: php-cs
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2
+
+      - name: Set up php
+        uses: shivammathur/setup-php@c5fc0d8281aba02c7fda07d3a70cc5371548067d # v2
+        with:
+          php-version: 8.1
+          coverage: none
+          ini-file: development
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Install dependencies
+        run: composer i
+
+      - name: Lint
+        run: composer run cs:check || ( echo 'Please run `composer run cs:fix` to format your code' && exit 1 )
\ No newline at end of file
diff --git a/.php-cs-fixer.cache b/.php-cs-fixer.cache
new file mode 100644
index 0000000..35158d2
--- /dev/null
+++ b/.php-cs-fixer.cache
@@ -0,0 +1 @@
+{"php":"8.3.2","version":"3.49.0","indent":"\t","lineEnding":"\n","rules":{"encoding":true,"full_opening_tag":true,"blank_line_after_namespace":true,"braces_position":true,"class_definition":true,"constant_case":true,"control_structure_braces":true,"control_structure_continuation_position":true,"elseif":true,"function_declaration":{"closure_function_spacing":"one"},"indentation_type":true,"line_ending":true,"lowercase_keywords":true,"method_argument_space":{"on_multiline":"ignore"},"no_break_comment":true,"no_closing_tag":true,"no_multiple_statements_per_line":true,"no_space_around_double_colon":true,"no_spaces_after_function_name":true,"no_trailing_whitespace":true,"no_trailing_whitespace_in_comment":true,"single_blank_line_at_eof":true,"single_class_element_per_statement":true,"single_import_per_statement":true,"single_line_after_imports":true,"spaces_inside_parentheses":true,"statement_indentation":true,"switch_case_semicolon_to_colon":true,"switch_case_space":true,"visibility_required":{"elements":["property","method","const"]},"align_multiline_comment":true,"array_indentation":true,"array_syntax":true,"binary_operator_spaces":{"default":"single_space"},"blank_line_after_opening_tag":true,"curly_braces_position":{"classes_opening_brace":"same_line","functions_opening_brace":"same_line"},"list_syntax":true,"no_leading_import_slash":true,"no_spaces_inside_parenthesis":true,"no_unused_imports":true,"nullable_type_declaration_for_default_null_value":true,"ordered_imports":{"imports_order":["class","function","const"],"sort_algorithm":"alpha"},"yoda_style":{"equal":false,"identical":false,"less_and_greater":false}},"hashes":{"appinfo\/routes.php":"79bcdccfabfe54c0df0baea844b48ee4","lib\/Controller\/GroceryListController.php":"def791ca24cf5f2e34af55826b1ed464","lib\/Db\/Category.php":"a5c68adfa19c127fbc9feef6b88cf895","lib\/Db\/CategoryMapper.php":"1cd303433beeab312720ef81d189ad4c","lib\/Db\/GroceryList.php":"7bd681e52f1e8282bb973d53f59dc966","lib\/Db\/GroceryListMapper.php":"65ee2eb3d72a15259c82fc3077fa6610","lib\/Db\/Item.php":"4469d2df5dd2b05b9227ec96c4210537","lib\/Db\/Sharee.php":"7654847c2162f0a6b3b951d5073a5e60","lib\/Db\/ItemMapper.php":"66cd13910ba9337251ed0096c95dbb62","lib\/Db\/ShareeGroceryListMapper.php":"e162ee885f07ce040ee5e68aa075cd3f","lib\/Migration\/Version000000Date20200604211400.php":"e39f6e7eff9ed0bcecfc7cbb137e196c","templates\/main.php":"245a35b8c13e475da18807c6caaf6475"}}
\ No newline at end of file
diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
new file mode 100644
index 0000000..42e6131
--- /dev/null
+++ b/.php-cs-fixer.dist.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+require_once './vendor/autoload.php';
+
+use Nextcloud\CodingStandard\Config;
+
+$config = new Config();
+$config
+	->getFinder()
+	->ignoreVCSIgnored(true)
+	->notPath('build')
+	->notPath('l10n')
+	->notPath('src')
+	->notPath('lib/Vendor')
+	->notPath('vendor')
+	->notPath('vendor-bin')
+	->in(__DIR__);
+return $config;
\ No newline at end of file
diff --git a/appinfo/routes.php b/appinfo/routes.php
index dd62e88..71d03ac 100644
--- a/appinfo/routes.php
+++ b/appinfo/routes.php
@@ -1,4 +1,5 @@
 <?php
+
 return [
 	'routes' => [
 		['name' => 'GroceryList#showGroceryList', 'url' => '/list/{id}', 'verb' => 'GET'],
diff --git a/composer.json b/composer.json
index d19fb77..57a1002 100644
--- a/composer.json
+++ b/composer.json
@@ -1,14 +1,20 @@
 {
-    "name": "tobiaskaminsky/grocery_list-0.1",
-    "description": "Grocery list for Nextcloud",
-    "type": "project",
-    "license": "AGPL",
-    "authors": [
-        {
-            "name": "Tobias Kaminsky"
-        }
-    ],
-    "require": {},
-    "require-dev": {
+  "name": "tobiaskaminsky/grocery_list-0.1",
+  "description": "Grocery list for Nextcloud",
+  "type": "project",
+  "license": "AGPL",
+  "authors": [
+    {
+      "name": "Tobias Kaminsky"
     }
+  ],
+  "require": {},
+  "require-dev": {
+    "nextcloud/coding-standard": "^1.1.1"
+  },
+  "scripts": {
+    "lint": "find . -name \\*.php -not -path './vendor/*' -not -path './build/*' -print0 | xargs -0 -n1 php -l",
+    "cs:fix": "php-cs-fixer fix",
+    "cs:check": "php-cs-fixer fix --dry-run --diff"
+  }
 }
diff --git a/composer.lock b/composer.lock
index 418f65f..dbe41e0 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,9 +4,103 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "3c02450d2be4d3a885985ab0b7008b2a",
+    "content-hash": "b5445dbecdbb8dccfae7e65679bc8699",
     "packages": [],
-    "packages-dev": [],
+    "packages-dev": [
+        {
+            "name": "nextcloud/coding-standard",
+            "version": "v1.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/nextcloud/coding-standard.git",
+                "reference": "cf5f18d989ec62fb4cdc7fc92a36baf34b3d829e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/nextcloud/coding-standard/zipball/cf5f18d989ec62fb4cdc7fc92a36baf34b3d829e",
+                "reference": "cf5f18d989ec62fb4cdc7fc92a36baf34b3d829e",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.3|^8.0",
+                "php-cs-fixer/shim": "^3.17"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Nextcloud\\CodingStandard\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Christoph Wurst",
+                    "email": "christoph@winzerhof-wurst.at"
+                }
+            ],
+            "description": "Nextcloud coding standards for the php cs fixer",
+            "support": {
+                "issues": "https://github.com/nextcloud/coding-standard/issues",
+                "source": "https://github.com/nextcloud/coding-standard/tree/v1.2.1"
+            },
+            "time": "2024-02-01T14:54:37+00:00"
+        },
+        {
+            "name": "php-cs-fixer/shim",
+            "version": "v3.49.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/PHP-CS-Fixer/shim.git",
+                "reference": "f7d3219cac46632f12362c9aa7c2ac0d2fe92c52"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/PHP-CS-Fixer/shim/zipball/f7d3219cac46632f12362c9aa7c2ac0d2fe92c52",
+                "reference": "f7d3219cac46632f12362c9aa7c2ac0d2fe92c52",
+                "shasum": ""
+            },
+            "require": {
+                "ext-json": "*",
+                "ext-tokenizer": "*",
+                "php": "^7.4 || ^8.0"
+            },
+            "replace": {
+                "friendsofphp/php-cs-fixer": "self.version"
+            },
+            "suggest": {
+                "ext-dom": "For handling output formats in XML",
+                "ext-mbstring": "For handling non-UTF8 characters."
+            },
+            "bin": [
+                "php-cs-fixer",
+                "php-cs-fixer.phar"
+            ],
+            "type": "application",
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Dariusz Rumiński",
+                    "email": "dariusz.ruminski@gmail.com"
+                }
+            ],
+            "description": "A tool to automatically fix PHP code style",
+            "support": {
+                "issues": "https://github.com/PHP-CS-Fixer/shim/issues",
+                "source": "https://github.com/PHP-CS-Fixer/shim/tree/v3.49.0"
+            },
+            "time": "2024-02-02T00:42:09+00:00"
+        }
+    ],
     "aliases": [],
     "minimum-stability": "stable",
     "stability-flags": [],
diff --git a/lib/Controller/GroceryListController.php b/lib/Controller/GroceryListController.php
index b445f9e..633ad0d 100644
--- a/lib/Controller/GroceryListController.php
+++ b/lib/Controller/GroceryListController.php
@@ -9,14 +9,13 @@
 use OCA\GroceryList\Db\Item;
 use OCA\GroceryList\Db\ItemMapper;
 use OCA\GroceryList\Db\ShareeGroceryListMapper;
-use OCP\ILogger;
-use OCP\IRequest;
-use OCP\AppFramework\Http\DataResponse;
 use OCP\AppFramework\Controller;
+use OCP\AppFramework\Http\DataResponse;
 use OCP\AppFramework\Http\TemplateResponse;
+use OCP\ILogger;
+use OCP\IRequest;
 
-class GroceryListController extends Controller
-{
+class GroceryListController extends Controller {
 
 	private GroceryListMapper $groceryListMapper;
 	private ItemMapper $itemMapper;
@@ -26,14 +25,13 @@ class GroceryListController extends Controller
 	private ILogger $logger;
 
 	public function __construct($AppName,
-								IRequest $request,
-								GroceryListMapper $groceryListMapper,
-								ItemMapper $itemMapper,
-								CategoryMapper $categoryMapper,
-								ShareeGroceryListMapper $shareeMapper,
-								ILogger $logger,
-		$UserId)
-	{
+		IRequest $request,
+		GroceryListMapper $groceryListMapper,
+		ItemMapper $itemMapper,
+		CategoryMapper $categoryMapper,
+		ShareeGroceryListMapper $shareeMapper,
+		ILogger $logger,
+		$UserId) {
 		parent::__construct($AppName, $request);
 		$this->groceryListMapper = $groceryListMapper;
 		$this->itemMapper = $itemMapper;
@@ -47,8 +45,7 @@ public function __construct($AppName,
 	 * @NoAdminRequired
 	 * @NoCSRFRequired
 	 */
-	public function index()
-	{
+	public function index() {
 		// Register all scripts and styles we use on the frontend
 		\OCP\Util::addScript($this->appName, $this->appName . '-main'); // adding `js/grocerylist-main.mjs` generated from JS source
 		\OCP\Util::addStyle($this->appName, $this->appName . '-main'); // adding `css/grocerylist-style.css` generated from JS source
@@ -60,8 +57,7 @@ public function index()
 	 * @NoAdminRequired
 	 * @NoCSRFRequired
 	 */
-	public function showGroceryList($id)
-	{
+	public function showGroceryList($id) {
 		return $this->index();
 	}
 
@@ -69,8 +65,7 @@ public function showGroceryList($id)
 	 * @NoAdminRequired
 	 * @NoCSRFRequired
 	 */
-	public function showGroceryListSettings($id)
-	{
+	public function showGroceryListSettings($id) {
 		return $this->index();
 	}
 
@@ -93,8 +88,7 @@ public function lists()
 	 * @param string $title
 	 * @return DataResponse
 	 */
-	public function saveList(string $title)
-	{
+	public function saveList(string $title) {
 		$groceryList = new GroceryList();
 		$groceryList->setTitle($title);
 		$groceryList->setUserId($this->userId);
@@ -107,8 +101,7 @@ public function saveList(string $title)
 	 * @param int $id
 	 * @return \OCP\AppFramework\Db\Entity
 	 */
-	public function deleteList(int $id)
-	{
+	public function deleteList(int $id) {
 		$groceryList = $this->groceryListMapper->find($id);
 		$this->groceryListMapper->delete($groceryList);
 
@@ -121,8 +114,7 @@ public function deleteList(int $id)
 	 * @param string $title
 	 * @param string $showOnlyUnchecked
 	 */
-	public function renameList(int $id, string $title)
-	{
+	public function renameList(int $id, string $title) {
 		$list = $this->groceryListMapper->find($id);
 		$list->setTitle($title);
 
@@ -136,8 +128,7 @@ public function renameList(int $id, string $title)
 	 * @param string $title
 	 * @param string $showOnlyUnchecked
 	 */
-	public function updateList(int $id, string $title, int $showOnlyUnchecked = 0)
-	{
+	public function updateList(int $id, string $title, int $showOnlyUnchecked = 0) {
 		$list = $this->groceryListMapper->find($id);
 		$list->setShowOnlyUnchecked($showOnlyUnchecked);
 		$list->setTitle($title);
@@ -151,8 +142,7 @@ public function updateList(int $id, string $title, int $showOnlyUnchecked = 0)
 	 * @param string $title
 	 * @param string $showOnlyUnchecked
 	 */
-	public function updateListVisibility(int $id, int $showOnlyUnchecked = 0)
-	{
+	public function updateListVisibility(int $id, int $showOnlyUnchecked = 0) {
 		$list = $this->groceryListMapper->find($id);
 		$list->setShowOnlyUnchecked($showOnlyUnchecked);
 
@@ -164,8 +154,7 @@ public function updateListVisibility(int $id, int $showOnlyUnchecked = 0)
 	 * @NoCSRFRequired
 	 * @return DataResponse
 	 */
-	public function showList(int $id)
-	{
+	public function showList(int $id) {
 		return new DataResponse($this->groceryListMapper->find($id));
 	}
 
@@ -174,8 +163,7 @@ public function showList(int $id)
 	 * @NoCSRFRequired
 	 * @param int $id
 	 */
-	public function listItems(int $id)
-	{
+	public function listItems(int $id) {
 		return new DataResponse($this->itemMapper->findAll($id));
 	}
 
@@ -202,8 +190,7 @@ public function deleteItem(int $id) {
 	 * @NoAdminRequired
 	 * @param int $id
 	 */
-	public function listCategories(int $id)
-	{
+	public function listCategories(int $id) {
 		$returnList = [];
 		$categories = $this->categoryMapper->findAll($id);
 
@@ -220,8 +207,7 @@ public function listCategories(int $id)
 	 * @NoAdminRequired
 	 * @param int $id
 	 */
-	public function listAllCategories(int $id)
-	{
+	public function listAllCategories(int $id) {
 		return new DataResponse($this->categoryMapper->findAll($id));
 	}
 
@@ -233,8 +219,7 @@ public function listAllCategories(int $id)
 	 * @param int $list
 	 * @return DataResponse
 	 */
-	public function addItem(string $name, string $quantity, int $category, int $list)
-	{
+	public function addItem(string $name, string $quantity, int $category, int $list) {
 		$item = new Item();
 		$item->setName($name);
 		$item->setQuantity($quantity);
@@ -252,8 +237,7 @@ public function addItem(string $name, string $quantity, int $category, int $list
 	 * @param int $category
 	 * @return DataResponse
 	 */
-	public function updateItem(int $id, string $name, string $quantity, int $category)
-	{
+	public function updateItem(int $id, string $name, string $quantity, int $category) {
 		$item = $this->itemMapper->find($id);
 		$item->setName($name);
 		$item->setQuantity($quantity);
@@ -265,8 +249,7 @@ public function updateItem(int $id, string $name, string $quantity, int $categor
 	/**
 	 * @NoAdminRequired
 	 */
-	public function hideItem(int $id)
-	{
+	public function hideItem(int $id) {
 		$item = $this->itemMapper->find($id);
 		$item->setHidden(time());
 
@@ -279,8 +262,7 @@ public function hideItem(int $id)
 	 * @param bool $checked
 	 * @return DataResponse
 	 */
-	public function checkItem(int $id, bool $checked)
-	{
+	public function checkItem(int $id, bool $checked) {
 		$item = $this->itemMapper->find($id);
 		$item->setChecked($checked);
 
@@ -293,8 +275,7 @@ public function checkItem(int $id, bool $checked)
 	 * @param string $name
 	 * @return DataResponse
 	 */
-	public function addCategory(int $id, string $name)
-	{
+	public function addCategory(int $id, string $name) {
 		$category = new Category();
 		$category->setList($id);
 		$category->setName($name);
@@ -311,8 +292,7 @@ public function addCategory(int $id, string $name)
 	 * @param string $newName
 	 * @return DataResponse
 	 */
-	public function updateCategory(int $id, string $newName)
-	{
+	public function updateCategory(int $id, string $newName) {
 		$category = $this->categoryMapper->find($id);
 		$category->setName($newName);
 
@@ -325,8 +305,7 @@ public function updateCategory(int $id, string $newName)
 	 * @NoAdminRequired
 	 * @param int $id
 	 */
-	public function sharees(int $id): DataResponse
-	{
+	public function sharees(int $id): DataResponse {
 		return new DataResponse($this->shareeMapper->findSharees($id));
 	}
 }
diff --git a/lib/Db/CategoryMapper.php b/lib/Db/CategoryMapper.php
index 446d8cb..ad6563f 100644
--- a/lib/Db/CategoryMapper.php
+++ b/lib/Db/CategoryMapper.php
@@ -2,9 +2,8 @@
 
 namespace OCA\GroceryList\Db;
 
-use OCP\AppFramework\Db\Entity;
-use OCP\IDBConnection;
 use OCP\AppFramework\Db\QBMapper;
+use OCP\IDBConnection;
 
 /**
  * @template-implements QBMapper<Category>
diff --git a/lib/Db/GroceryListMapper.php b/lib/Db/GroceryListMapper.php
index 7d535e5..cd96850 100644
--- a/lib/Db/GroceryListMapper.php
+++ b/lib/Db/GroceryListMapper.php
@@ -2,9 +2,8 @@
 
 namespace OCA\GroceryList\Db;
 
-use OCP\AppFramework\Db\Entity;
-use OCP\IDBConnection;
 use OCP\AppFramework\Db\QBMapper;
+use OCP\IDBConnection;
 
 /**
  * @template-implements QBMapper<GroceryList>
@@ -34,7 +33,7 @@ public function find(int $id) : GroceryList {
 			return $result[0];
 		} else {
 			$sharedList = $this->shareeMapper->find($id);
-				return $this->findById($sharedList->list);
+			return $this->findById($sharedList->list);
 		}
 	}
 
diff --git a/lib/Db/ItemMapper.php b/lib/Db/ItemMapper.php
index 235c7c8..b05cdc2 100644
--- a/lib/Db/ItemMapper.php
+++ b/lib/Db/ItemMapper.php
@@ -2,17 +2,16 @@
 
 namespace OCA\GroceryList\Db;
 
-use OCP\AppFramework\Db\Entity;
+use OCP\AppFramework\Db\QBMapper;
 use OCP\DB\Exception;
 use OCP\IDBConnection;
-use OCP\AppFramework\Db\QBMapper;
 
 /**
  * @template-implements QBMapper<Item>
  */
 class ItemMapper extends QBMapper {
 
-	const OFFSET = 15 * 60;
+	public const OFFSET = 15 * 60;
 
 	public function __construct(IDBConnection $db) {
 		parent::__construct($db, 'grocerylist_items', Item::class);
diff --git a/lib/Db/ShareeGroceryListMapper.php b/lib/Db/ShareeGroceryListMapper.php
index c31e567..2201b73 100644
--- a/lib/Db/ShareeGroceryListMapper.php
+++ b/lib/Db/ShareeGroceryListMapper.php
@@ -2,9 +2,9 @@
 
 namespace OCA\GroceryList\Db;
 
+use OCP\AppFramework\Db\QBMapper;
 use OCP\DB\Exception;
 use OCP\IDBConnection;
-use OCP\AppFramework\Db\QBMapper;
 
 /**
  * @template-implements QBMapper<Sharee>
diff --git a/lib/Migration/Version000000Date20200604211400.php b/lib/Migration/Version000000Date20200604211400.php
index 8b497c2..a95351a 100644
--- a/lib/Migration/Version000000Date20200604211400.php
+++ b/lib/Migration/Version000000Date20200604211400.php
@@ -4,8 +4,8 @@
 
 use Closure;
 use OCP\DB\ISchemaWrapper;
-use OCP\Migration\SimpleMigrationStep;
 use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
 
 class Version000000Date20200604211400 extends SimpleMigrationStep {