diff --git a/packages/analytics/src/trackers/EventTracker.ts b/packages/analytics/src/trackers/EventTracker.ts
index a33317d8240..f8c147d078d 100644
--- a/packages/analytics/src/trackers/EventTracker.ts
+++ b/packages/analytics/src/trackers/EventTracker.ts
@@ -13,7 +13,7 @@
 
 import { delegate } from '../vendor/dom-utils';
 import { EventTrackOpts } from '../types';
-import { ConsoleLogger as Logger } from '@aws-amplify/core';
+import { ConsoleLogger as Logger, JS } from '@aws-amplify/core';
 
 const logger = new Logger('EventTracker');
 
@@ -30,7 +30,7 @@ export default class EventTracker {
     private _delegates;
 
     constructor(tracker, opts) {
-        if (!window || !window.addEventListener) {
+        if (!JS.browserOrNode().isBrowser || !window.addEventListener) {
             logger.debug('not in the supported web environment');
             return;
         }
diff --git a/packages/analytics/src/trackers/PageViewTracker.ts b/packages/analytics/src/trackers/PageViewTracker.ts
index 402e0fc1688..fe24c2310d4 100644
--- a/packages/analytics/src/trackers/PageViewTracker.ts
+++ b/packages/analytics/src/trackers/PageViewTracker.ts
@@ -13,13 +13,14 @@
 
 import { pageViewTrackOpts } from '../types';
 import MethodEmbed from '../utils/MethodEmbed';
-import { ConsoleLogger as Logger } from '@aws-amplify/core';
+import { ConsoleLogger as Logger, JS } from '@aws-amplify/core';
 
 const logger = new Logger('PageViewTracker');
 const PREV_URL_KEY = 'aws-amplify-analytics-prevUrl';
 
 const getUrl = () => {
-    return window.location.origin + window.location.pathname;
+    if (!JS.browserOrNode().isBrowser) return '';
+    else return window.location.origin + window.location.pathname;
 };
 
 const defaultOpts: pageViewTrackOpts = {
@@ -72,7 +73,7 @@ export default class PageViewTracker {
     }
 
     private async _pageViewTrackDefault() {
-        if (!window || !window.addEventListener || !window.sessionStorage) {
+        if (!JS.browserOrNode().isBrowser || !window.addEventListener || !window.sessionStorage) {
             logger.debug('not in the supported web enviroment');
             return;
         }
@@ -101,7 +102,7 @@ export default class PageViewTracker {
     }
 
     private async _trackFunc() {
-        if (!window || !window.addEventListener || !history.pushState || !window.sessionStorage) {
+        if (!JS.browserOrNode().isBrowser || !window.addEventListener || !history.pushState || !window.sessionStorage) {
             logger.debug('not in the supported web enviroment');
             return;
         }
@@ -132,7 +133,7 @@ export default class PageViewTracker {
     
 
     private _pageViewTrackSPA() {
-        if (!window || !window.addEventListener || !history.pushState) {
+        if (!JS.browserOrNode().isBrowser || !window.addEventListener || !history.pushState) {
             logger.debug('not in the supported web enviroment');
             return;
         }
diff --git a/packages/analytics/src/trackers/SessionTracker.ts b/packages/analytics/src/trackers/SessionTracker.ts
index c6d2e1fa425..f0c67f80edc 100644
--- a/packages/analytics/src/trackers/SessionTracker.ts
+++ b/packages/analytics/src/trackers/SessionTracker.ts
@@ -13,7 +13,7 @@
 
  // the session tracker for web
 
-import { ConsoleLogger as Logger, Hub } from '@aws-amplify/core';
+import { ConsoleLogger as Logger, Hub, JS } from '@aws-amplify/core';
 import { SessionTrackOpts } from '../types';
 
 const logger = new Logger('SessionTracker');
@@ -45,6 +45,10 @@ export default class SessionTracker {
     }
 
     private _envCheck() {
+        if (!JS.browserOrNode().isBrowser) {
+            return false;
+        }
+
         if (!document || !document.addEventListener) {
             logger.debug('not in the supported web environment');
             return false;
diff --git a/packages/analytics/src/vendor/dom-utils/matches.ts b/packages/analytics/src/vendor/dom-utils/matches.ts
index da47087cc00..924feb952c2 100644
--- a/packages/analytics/src/vendor/dom-utils/matches.ts
+++ b/packages/analytics/src/vendor/dom-utils/matches.ts
@@ -2,7 +2,9 @@
  * Copyright (c) 2017, Philip Walton <philip@philipwalton.com>
  */
 
-const proto = window && window['Element']? window['Element'].prototype: null;
+import { JS } from '@aws-amplify/core';
+
+const proto = JS.browserOrNode().isBrowser && window['Element']? window['Element'].prototype: null;
 const nativeMatches = proto ? proto.matches ||
       proto.matchesSelector ||
       proto.webkitMatchesSelector ||
diff --git a/packages/analytics/src/vendor/dom-utils/parse-url.ts b/packages/analytics/src/vendor/dom-utils/parse-url.ts
index 03702d18119..65e54230205 100644
--- a/packages/analytics/src/vendor/dom-utils/parse-url.ts
+++ b/packages/analytics/src/vendor/dom-utils/parse-url.ts
@@ -2,11 +2,13 @@
  * Copyright (c) 2017, Philip Walton <philip@philipwalton.com>
  */
 
+import { JS } from '@aws-amplify/core';
+
 const HTTP_PORT = '80';
 const HTTPS_PORT = '443';
 const DEFAULT_PORT = RegExp(':(' + HTTP_PORT + '|' + HTTPS_PORT + ')$');
 
-const a = document? document.createElement('a') : null;
+const a = JS.browserOrNode().isBrowser ? document.createElement('a') : null;
 const cache = {};
 
 /**
diff --git a/packages/auth/src/Auth.ts b/packages/auth/src/Auth.ts
index fce8617b323..65a51cdf3d7 100644
--- a/packages/auth/src/Auth.ts
+++ b/packages/auth/src/Auth.ts
@@ -187,7 +187,7 @@ export default class AuthClass {
                 logger.debug('user already logged in');
             }).catch(e => {
                 logger.debug('not logged in, try to parse the url');
-                if (!window || !window.location) {
+                if (!JS.browserOrNode().isBrowser || !window.location) {
                     logger.debug('not in the browser');
                     return;
                 }
diff --git a/packages/core/src/OAuthHelper/FacebookOAuth.ts b/packages/core/src/OAuthHelper/FacebookOAuth.ts
index 941f30bfc7e..3970ada638c 100644
--- a/packages/core/src/OAuthHelper/FacebookOAuth.ts
+++ b/packages/core/src/OAuthHelper/FacebookOAuth.ts
@@ -57,7 +57,7 @@ export default class FacebookOAuth {
 
     private _refreshFacebookTokenImpl() {
         let fb = null;
-        if (window) fb = window['FB'];
+        if (JS.browserOrNode().isBrowser) fb = window['FB'];
         if (!fb) {
             logger.debug('no fb sdk available');
             return Promise.reject('no fb sdk available');
diff --git a/packages/core/src/OAuthHelper/GoogleOAuth.ts b/packages/core/src/OAuthHelper/GoogleOAuth.ts
index fa0b69ed481..682513b043d 100644
--- a/packages/core/src/OAuthHelper/GoogleOAuth.ts
+++ b/packages/core/src/OAuthHelper/GoogleOAuth.ts
@@ -58,7 +58,7 @@ export default class GoogleOAuth {
 
     private _refreshGoogleTokenImpl() {
         let ga = null;
-        if (window) ga = window['gapi'] && window['gapi'].auth2 ? window['gapi'].auth2 : null;
+        if (JS.browserOrNode().isBrowser) ga = window['gapi'] && window['gapi'].auth2 ? window['gapi'].auth2 : null;
         if (!ga) {
             logger.debug('no gapi auth2 available');
             return Promise.reject('no gapi auth2 available');
diff --git a/packages/core/src/ServiceWorker/ServiceWorker.ts b/packages/core/src/ServiceWorker/ServiceWorker.ts
index 1025c0daafe..ea10963d012 100644
--- a/packages/core/src/ServiceWorker/ServiceWorker.ts
+++ b/packages/core/src/ServiceWorker/ServiceWorker.ts
@@ -11,6 +11,7 @@
  * and limitations under the License.
  */
 import { ConsoleLogger as Logger } from '../Logger';
+import JS from '../JS';
 import Amplify from '../Amplify';
 /**
  * Provides a means to registering a service worker in the browser
@@ -107,7 +108,7 @@ class ServiceWorkerClass {
         if (!this._registration) throw new Error('Service Worker not registered');
         this._publicKey = publicKey;
         return new Promise((resolve, reject) => {
-            if (window) {
+            if (JS.browserOrNode().isBrowser) {
                 this._registration.pushManager.getSubscription()
                     .then((subscription) => {
                         if (subscription) {