diff --git a/MMM-AirQuality.js b/MMM-AirQuality.js
index 4195355..847a9f0 100755
--- a/MMM-AirQuality.js
+++ b/MMM-AirQuality.js
@@ -5,25 +5,25 @@
  * MIT Licensed.
  */
 Module.register('MMM-AirQuality', {
-	// Default module config.
-	defaults: {
+  // Default module config.
+  defaults: {
     initialDelay: 0,
-		lang: '',
-		location: '',
-		showLocation: true,
-		showIndex: true,
-		appendLocationNameToHeader: true,
-		updateInterval: 30, // every 30 minutes
-		animationSpeed: 1000,
-		token: '',
+    lang: '',
+    location: '',
+    showLocation: true,
+    showIndex: true,
+    appendLocationNameToHeader: true,
+    updateInterval: 30, // every 30 minutes
+    animationSpeed: 1000,
+    token: '',
     apiBase: 'api.waqi.info/',
     dataEndpoint: 'feed/',
-	},
+  },
   notifications: {
     DATA: 'AIR_QUALITY_DATA',
     DATA_RESPONSE: 'AIR_QUALITY_DATA_RESPONSE',
   },
-	start: function(){
+  start: function () {
     const self = this
     Log.info(`Starting module: ${this.name}`)
     self.loaded = false
@@ -36,85 +36,84 @@ Module.register('MMM-AirQuality', {
     setInterval(function () {
       self.sendSocketNotification(self.notifications.DATA, self.config)
     }, this.config.updateInterval * 60 * 1000 + this.config.initialDelay * 1000)
-	},
-	render: function(response){
-		let data = response.data;
-		this.data.value = data.aqi;
-		this.data.city = data.city.name;
-		this.loaded = true;
+  },
+  render: function (response) {
+    const data = response.data
+    this.data.value = data.aqi
+    this.data.city = data.city.name
+    this.loaded = true
 
-		if (data.aqi < 51) {
-			this.data.color = "#009966";
-			this.data.impact = 'Good';
-		} else if (data.aqi < 101) {
-			this.data.color = "#ffde33";
-			this.data.impact = 'Moderate';
-		} else if (data.aqi < 151) {
-			this.data.color = '#ff9933';
-			this.data.impact = 'Unhealty for Sensitive Groups';
-		} else if (data.aqi < 201) {
-			this.data.color = '#cc0033';
-			this.data.impact = 'Unhealthy';
-		} else if (data.aqi < 301) {
-			this.data.color = '#7e0023';
-			this.data.impact = 'Hazardous';
-		}
-	},
-	html: {
-		icon: '<i class="fa-solid fa-smog"></i>',
-		city: '<div class="xsmall">{0}</div>',
-		quality: '<div style="color: {0}">{1} {2}{3}</div>'
-	},
-	getScripts: function() {
-		return [
-			'//cdnjs.cloudflare.com/ajax/libs/jquery/2.2.2/jquery.js',
-			'String.format.js'
-		];
-	},
-	getStyles: function() {
-		return ['https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css'];
-	},
+    if (data.aqi < 51) {
+      this.data.color = '#009966'
+      this.data.impact = 'Good'
+    } else if (data.aqi < 101) {
+      this.data.color = '#ffde33'
+      this.data.impact = 'Moderate'
+    } else if (data.aqi < 151) {
+      this.data.color = '#ff9933'
+      this.data.impact = 'Unhealty for Sensitive Groups'
+    } else if (data.aqi < 201) {
+      this.data.color = '#cc0033'
+      this.data.impact = 'Unhealthy'
+    } else if (data.aqi < 301) {
+      this.data.color = '#7e0023'
+      this.data.impact = 'Hazardous'
+    }
+  },
+  html: {
+    icon: '<i class="fa-solid fa-smog"></i>',
+    city: '<div class="xsmall">{0}</div>',
+    quality: '<div style="color: {0}">{1} {2}{3}</div>',
+  },
+  getScripts: function () {
+    return [
+      '//cdnjs.cloudflare.com/ajax/libs/jquery/2.2.2/jquery.js',
+      'String.format.js',
+    ]
+  },
+  getStyles: function () {
+    return ['https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css']
+  },
   // Override getHeader method.
   getHeader: function () {
-    var header = ""
-    if (this.data.header)
-      header += this.data.header;
+    let header = ''
+    if (this.data.header) { header += this.data.header }
     if (this.config.appendLocationNameToHeader) {
-      if (header != "") {
-        header += " ";
+      if (header !== '') {
+        header += ' '
       }
-      header += this.data.city;
+      header += this.data.city
     }
     return header
   },
-	// Override dom generator.
-	getDom: function() {
-		var wrapper = document.createElement("div");
-		if (this.config.token === '') {
-			wrapper.innerHTML = "Please set the AQICN token for module: " + this.name + ". You can acquire one at <a href='https://aqicn.org/data-platform/token/'>https://aqicn.org/data-platform/token/</a>.";
-			wrapper.className = "dimmed light small";
-			return wrapper;
-		}
-		if (this.config.location === '') {
-			wrapper.innerHTML = "Please set the air quality index <i>location</i> in the config for module: " + this.name + ".";
-			wrapper.className = "dimmed light small";
-			return wrapper;
-		}
+  // Override dom generator.
+  getDom: function () {
+    const wrapper = document.createElement('div')
+    if (this.config.token === '') {
+      wrapper.innerHTML = 'Please set the AQICN token for module: ' + this.name + ". You can acquire one at <a href='https://aqicn.org/data-platform/token/'>https://aqicn.org/data-platform/token/</a>."
+      wrapper.className = 'dimmed light small'
+      return wrapper
+    }
+    if (this.config.location === '') {
+      wrapper.innerHTML = 'Please set the air quality index <i>location</i> in the config for module: ' + this.name + '.'
+      wrapper.className = 'dimmed light small'
+      return wrapper
+    }
 
-		if (!this.loaded) {
-			wrapper.innerHTML = "Loading air quality index ...";
-			wrapper.className = "dimmed light small";
-			return wrapper;
-		}
-		wrapper.innerHTML =
-			this.html.quality.format(
-				this.data.color,
-				this.html.icon,
-				this.data.impact,
-				(this.config.showIndex?' ('+this.data.value+')':''))+
-			(this.config.showLocation && !this.config.appendLocationNameToHeader?this.html.city.format(this.data.city):'');
-		return wrapper;
-	},
+    if (!this.loaded) {
+      wrapper.innerHTML = 'Loading air quality index ...'
+      wrapper.className = 'dimmed light small'
+      return wrapper
+    }
+    wrapper.innerHTML =
+      this.html.quality.format(
+        this.data.color,
+        this.html.icon,
+        this.data.impact,
+        (this.config.showIndex ? ' (' + this.data.value + ')' : '')) +
+      (this.config.showLocation && !this.config.appendLocationNameToHeader ? this.html.city.format(this.data.city) : '')
+    return wrapper
+  },
   socketNotificationReceived: function (notification, payload) {
     const self = this
     Log.debug('received ' + notification)
@@ -123,11 +122,11 @@ Module.register('MMM-AirQuality', {
         if (payload.status === 'OK') {
           console.log('Data %o', payload.payloadReturn)
           self.render(payload.payloadReturn)
-          self.updateDom(this.animationSpeed);
+          self.updateDom(this.animationSpeed)
         } else {
           console.log('DATA FAILED ' + payload.message)
         }
         break
     }
   },
-});
+})
diff --git a/String.format.js b/String.format.js
index a40f784..8b00f40 100644
--- a/String.format.js
+++ b/String.format.js
@@ -1,12 +1,12 @@
 // add string format method
 if (!String.prototype.format) {
-	String.prototype.format = function() {
-		var args = arguments;
-		return this.replace(/{(\d+)}/g, function(match, number) {
-			return typeof args[number] != 'undefined'
-				? args[number]
-				: match
-			;
-		});
-	};
+  // eslint-disable-next-line no-extend-native
+  String.prototype.format = function () {
+    const args = arguments
+    return this.replace(/{(\d+)}/g, function (match, number) {
+      return typeof args[number] !== 'undefined'
+        ? args[number]
+        : match
+    })
+  }
 }
diff --git a/helper.js b/helper.js
index 48d21be..f6eb89b 100644
--- a/helper.js
+++ b/helper.js
@@ -16,16 +16,16 @@ module.exports = {
   loadData: async function (config) {
     const self = this
     self.config = config
-        let url = `https://${self.config.apiBase}${self.config.dataEndpoint}${self.config.location}/?token=${this.config.token}`
-        console.log(`AirQuality loaded: ${url}`)
+    const url = `https://${self.config.apiBase}${self.config.dataEndpoint}${self.config.location}/?token=${this.config.token}`
+    console.log(`AirQuality loaded: ${url}`)
 
-      let result = await fetch(url)
-        .then(response => response.json())
+    const result = await fetch(url)
+      .then(response => response.json())
 
-      self.sendSocketNotification(self.notifications.DATA_RESPONSE, {
-        payloadReturn: result,
-        status: 'OK',
-      })
+    self.sendSocketNotification(self.notifications.DATA_RESPONSE, {
+      payloadReturn: result,
+      status: 'OK',
+    })
   },
   socketNotificationReceived: function (notification, payload) {
     switch (notification) {