diff --git a/src/server/.gitignore b/src/server/.gitignore
new file mode 100644
index 0000000..e71630d
--- /dev/null
+++ b/src/server/.gitignore
@@ -0,0 +1,3 @@
+# ignore node_modules folder for eslint
+node_modules
+webapp
\ No newline at end of file
diff --git a/src/server/admin/api/postHandler.js b/src/server/admin/api/postHandler.js
index 3b2c203..0bcb8e4 100644
--- a/src/server/admin/api/postHandler.js
+++ b/src/server/admin/api/postHandler.js
@@ -31,7 +31,7 @@ class POSTHandler {
                     db.writeJSONDataSimple( 'seatplan', data.location, dat ).then( resp => { 
                         db.getJSONDataSimple( 'locations', data.location ).then( dat => { 
                             let s = dat;
-                            s[ 'totalSeats' ] = data.data.seatInfo.count
+                            s[ 'totalSeats' ] = data.data.seatInfo.count;
                             db.writeJSONDataSimple( 'locations', data.location, s ).then( () => {
                                 resolve( resp );
                             } );
@@ -44,7 +44,7 @@ class POSTHandler {
                 db.writeJSONDataSimple( 'seatplan', data.location, { 'draft': {}, 'save': data.data } ).then( resp => { 
                     db.getJSONDataSimple( 'locations', data.location ).then( dat => { 
                         let s = dat;
-                        s[ 'totalSeats' ] = data.data.seatInfo.count
+                        s[ 'totalSeats' ] = data.data.seatInfo.count;
                         db.writeJSONDataSimple( 'locations', data.location, s ).then( () => {
                             resolve( resp );
                         } );
diff --git a/src/server/backend/payments/paymentRoutes.js b/src/server/backend/payments/paymentRoutes.js
index 21b9091..7246514 100644
--- a/src/server/backend/payments/paymentRoutes.js
+++ b/src/server/backend/payments/paymentRoutes.js
@@ -12,7 +12,7 @@ const fs = require( 'fs' );
 // const ph = require( './paymentHandler.js' );
 // const paymentHandler = new ph();
 
-module.exports = ( app, settings ) => {
+module.exports = ( app ) => {
     app.get( '/payments/canceled', ( req, res ) => {
         res.sendFile( path.join( __dirname + '/../../ui/en/payments/canceled.html' ) );
     } );
diff --git a/src/server/backend/plugins/others/poll/js/settings.js b/src/server/backend/plugins/others/poll/js/settings.js
index 3ea2220..c82a90d 100644
--- a/src/server/backend/plugins/others/poll/js/settings.js
+++ b/src/server/backend/plugins/others/poll/js/settings.js
@@ -1,3 +1,4 @@
+/* eslint-disable no-undef */
 const { createApp } = Vue;
 
 createApp( {
diff --git a/src/server/backend/plugins/others/poll/js/voting.js b/src/server/backend/plugins/others/poll/js/voting.js
index 65b5081..1299159 100644
--- a/src/server/backend/plugins/others/poll/js/voting.js
+++ b/src/server/backend/plugins/others/poll/js/voting.js
@@ -1,3 +1,4 @@
+/* eslint-disable no-undef */
 const { createApp } = Vue;
 
 createApp( {
diff --git a/src/server/package.json b/src/server/package.json
index 562db19..7cf2b46 100644
--- a/src/server/package.json
+++ b/src/server/package.json
@@ -63,7 +63,7 @@
     "vue": "^3.3.4"
   },
   "scripts": {
-    "test": "test.js"
+    "lint": "eslint . --ext .js,.jsx,.cjs,.mjs --fix --ignore-path .gitignore"
   },
   "repository": {
     "type": "git",
diff --git a/src/server/ui/home/helper.js b/src/server/ui/home/helper.js
index 8429f8b..80d1416 100644
--- a/src/server/ui/home/helper.js
+++ b/src/server/ui/home/helper.js
@@ -1,4 +1,4 @@
-var theme = localStorage.getItem( 'theme' ) ?? '';
+let theme = localStorage.getItem( 'theme' ) ?? '';
 if ( window.matchMedia( '(prefers-color-scheme: dark)' ).matches || theme === '☼' ) {
     document.documentElement.classList.add( 'dark' );
     document.getElementById( 'themeSelector' ).innerHTML = '☼';
@@ -9,6 +9,7 @@ if ( window.matchMedia( '(prefers-color-scheme: dark)' ).matches || theme === '&
     theme = '☽';
 }
 
+// eslint-disable-next-line no-unused-vars
 function changeTheme () {
     if ( theme === '☼' ) {
         document.documentElement.classList.remove( 'dark' );