From 2e0e81b63a67a75e4d097b607d9f4a3857a54acf Mon Sep 17 00:00:00 2001
From: Krishna Rajendran <krishna@emptybox.org>
Date: Thu, 18 Jan 2018 13:40:46 -0800
Subject: [PATCH] Namespace local storage keys with api key (#132)

* Namespace local storage keys with api key

Some weird sites(eg optimizely's visual editor) pollute local storage by
acting as a proxy to other sites. These changes should prevent different
domains from contaminating each other.
---
 amplitude.js             | 94 ++++++++++++++++++++++++++++-----------
 amplitude.min.js         |  2 +-
 karma.conf.js            |  3 ++
 package.json             |  1 +
 rollup.test.js           |  1 +
 src/amplitude-client.js  | 95 +++++++++++++++++++++++++++++-----------
 test/amplitude-client.js | 68 ++++++++++++++--------------
 test/amplitude.js        | 81 ++++++++++++++++++++++------------
 yarn.lock                |  6 +++
 9 files changed, 239 insertions(+), 112 deletions(-)

diff --git a/amplitude.js b/amplitude.js
index 89706bf3..334b9ba9 100644
--- a/amplitude.js
+++ b/amplitude.js
@@ -5673,7 +5673,7 @@ var DEFAULT_OPTIONS = {
  */
 var AmplitudeClient = function AmplitudeClient(instanceName) {
   this._instanceName = utils.isEmptyString(instanceName) ? constants.DEFAULT_INSTANCE : instanceName.toLowerCase();
-  this._storageSuffix = this._instanceName === constants.DEFAULT_INSTANCE ? '' : '_' + this._instanceName;
+  this._legacyStorageSuffix = this._instanceName === constants.DEFAULT_INSTANCE ? '' : '_' + this._instanceName;
   this._unsentEvents = [];
   this._unsentIdentifys = [];
   this._ua = new uaParser(navigator.userAgent).getResult();
@@ -5716,6 +5716,7 @@ AmplitudeClient.prototype.init = function init(apiKey, opt_userId, opt_config, o
 
   try {
     this.options.apiKey = apiKey;
+    this._storageSuffix = '_' + apiKey + this._legacyStorageSuffix;
     _parseConfig(this.options, opt_config);
     this.cookieStorage.options({
       expirationDays: this.options.cookieExpiration,
@@ -5864,6 +5865,29 @@ AmplitudeClient.prototype._apiKeySet = function _apiKeySet(methodName) {
  */
 AmplitudeClient.prototype._loadSavedUnsentEvents = function _loadSavedUnsentEvents(unsentKey) {
   var savedUnsentEventsString = this._getFromStorage(localStorage$1, unsentKey);
+  var events = this._parseSavedUnsentEventsString(savedUnsentEventsString, unsentKey);
+
+  var savedUnsentEventsStringLegacy = this._getFromStorageLegacy(localStorage$1, unsentKey);
+  var legacyEvents = this._parseSavedUnsentEventsString(savedUnsentEventsStringLegacy, unsentKey);
+
+  var unsentEvents = legacyEvents.concat(events);
+
+  // Migrate legacy events out of storage
+  this._removeFromLegacyStorage(localStorage$1, unsentKey);
+  this._setInStorage(localStorage$1, unsentKey, JSON.stringify(unsentEvents));
+
+  return unsentEvents;
+};
+
+AmplitudeClient.prototype._removeFromLegacyStorage = function _removeFromLegacyStorage(storage, key) {
+  storage.removeItem(key + this._legacyStorageSuffix);
+};
+
+/**
+ * Load saved events from localStorage. JSON deserializes event array. Handles case where string is corrupted.
+ * @private
+ */
+AmplitudeClient.prototype._parseSavedUnsentEventsString = function _parseSavedUnsentEventsString(savedUnsentEventsString, unsentKey) {
   if (utils.isEmptyString(savedUnsentEventsString)) {
     return []; // new app, does not have any saved events
   }
@@ -5977,6 +6001,15 @@ AmplitudeClient.prototype._getFromStorage = function _getFromStorage(storage, ke
   return storage.getItem(key + this._storageSuffix);
 };
 
+/**
+ * Helper function to fetch values from storage
+ * Storage argument allows for localStoraoge and sessionStoraoge
+ * @private
+ */
+AmplitudeClient.prototype._getFromStorageLegacy = function _getFromStorageLegacy(storage, key) {
+  return storage.getItem(key + this._legacyStorageSuffix);
+};
+
 /**
  * Helper function to set values in storage
  * Storage argument allows for localStoraoge and sessionStoraoge
@@ -5994,7 +6027,7 @@ AmplitudeClient.prototype._setInStorage = function _setInStorage(storage, key, v
  */
 var _upgradeCookeData = function _upgradeCookeData(scope) {
   // skip if migration already happened
-  var cookieData = scope.cookieStorage.get(scope.options.cookieName);
+  var cookieData = scope.cookieStorage.get(scope.options.cookieName + scope._storageSuffix);
   if (type(cookieData) === 'object' && cookieData.deviceId && cookieData.sessionId && cookieData.lastEventTime) {
     return;
   }
@@ -6047,34 +6080,45 @@ var _upgradeCookeData = function _upgradeCookeData(scope) {
  */
 var _loadCookieData = function _loadCookieData(scope) {
   var cookieData = scope.cookieStorage.get(scope.options.cookieName + scope._storageSuffix);
+
   if (type(cookieData) === 'object') {
-    if (cookieData.deviceId) {
-      scope.options.deviceId = cookieData.deviceId;
-    }
-    if (cookieData.userId) {
-      scope.options.userId = cookieData.userId;
-    }
-    if (cookieData.optOut !== null && cookieData.optOut !== undefined) {
-      scope.options.optOut = cookieData.optOut;
-    }
-    if (cookieData.sessionId) {
-      scope._sessionId = parseInt(cookieData.sessionId);
-    }
-    if (cookieData.lastEventTime) {
-      scope._lastEventTime = parseInt(cookieData.lastEventTime);
-    }
-    if (cookieData.eventId) {
-      scope._eventId = parseInt(cookieData.eventId);
-    }
-    if (cookieData.identifyId) {
-      scope._identifyId = parseInt(cookieData.identifyId);
-    }
-    if (cookieData.sequenceNumber) {
-      scope._sequenceNumber = parseInt(cookieData.sequenceNumber);
+    _loadCookieDataProps(scope, cookieData);
+  } else {
+    var legacyCookieData = scope.cookieStorage.get(scope.options.cookieName + scope._legacyStorageSuffix);
+    if (type(legacyCookieData) === 'object') {
+      scope.cookieStorage.remove(scope.options.cookieName + scope._legacyStorageSuffix);
+      _loadCookieDataProps(scope, legacyCookieData);
     }
   }
 };
 
+var _loadCookieDataProps = function _loadCookieDataProps(scope, cookieData) {
+  if (cookieData.deviceId) {
+    scope.options.deviceId = cookieData.deviceId;
+  }
+  if (cookieData.userId) {
+    scope.options.userId = cookieData.userId;
+  }
+  if (cookieData.optOut !== null && cookieData.optOut !== undefined) {
+    scope.options.optOut = cookieData.optOut;
+  }
+  if (cookieData.sessionId) {
+    scope._sessionId = parseInt(cookieData.sessionId);
+  }
+  if (cookieData.lastEventTime) {
+    scope._lastEventTime = parseInt(cookieData.lastEventTime);
+  }
+  if (cookieData.eventId) {
+    scope._eventId = parseInt(cookieData.eventId);
+  }
+  if (cookieData.identifyId) {
+    scope._identifyId = parseInt(cookieData.identifyId);
+  }
+  if (cookieData.sequenceNumber) {
+    scope._sequenceNumber = parseInt(cookieData.sequenceNumber);
+  }
+};
+
 /**
  * Saves deviceId, userId, event meta data to amplitude cookie
  * @private
diff --git a/amplitude.min.js b/amplitude.min.js
index c2107d7f..20712a59 100644
--- a/amplitude.min.js
+++ b/amplitude.min.js
@@ -1 +1 @@
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Please set a valid apiKey with init() before calling "+e),!1)},qt.prototype._loadSavedUnsentEvents=function(e){var t=this._getFromStorage(W,e),n=this._parseSavedUnsentEventsString(t,e),r=this._getFromStorageLegacy(W,e),o=this._parseSavedUnsentEventsString(r,e).concat(n);return this._removeFromLegacyStorage(W,e),this._setInStorage(W,e,JSON.stringify(o)),o},qt.prototype._removeFromLegacyStorage=function(e,t){e.removeItem(t+this._legacyStorageSuffix)},qt.prototype._parseSavedUnsentEventsString=function(e,t){if(M.isEmptyString(e))return[];if("string"===A(e))try{var n=JSON.parse(e);if("array"===A(n))return n}catch(e){}return M.log.error("Unable to load "+t+" events. Restart with a new empty queue."),[]},qt.prototype.isNewSession=function(){return this._newSession},qt.prototype.getSessionId=function(){return this._sessionId},qt.prototype.nextEventId=function(){return this._eventId++,this._eventId},qt.prototype.nextIdentifyId=function(){return this._identifyId++,this._identifyId},qt.prototype.nextSequenceNumber=function(){return this._sequenceNumber++,this._sequenceNumber},qt.prototype._unsentCount=function(){return this._unsentEvents.length+this._unsentIdentifys.length},qt.prototype._sendEventsIfReady=function(e){return 0!==this._unsentCount()&&(this.options.batchEvents?this._unsentCount()>=this.options.eventUploadThreshold?(this.sendEvents(e),!0):(this._updateScheduled||(this._updateScheduled=!0,setTimeout(function(){this._updateScheduled=!1,this.sendEvents()}.bind(this),this.options.eventUploadPeriodMillis)),!1):(this.sendEvents(e),!0))},qt.prototype._getFromStorage=function(e,t){return e.getItem(t+this._storageSuffix)},qt.prototype._getFromStorageLegacy=function(e,t){return e.getItem(t+this._legacyStorageSuffix)},qt.prototype._setInStorage=function(e,t,n){e.setItem(t+this._storageSuffix,n)};var Vt=function(e){var t=e.cookieStorage.get(e.options.cookieName+e._storageSuffix);if(!("object"===A(t)&&t.deviceId&&t.sessionId&&t.lastEventTime)){var n=function(e){var t=W.getItem(e);return W.removeItem(e),t},r="string"===A(e.options.apiKey)&&"_"+e.options.apiKey.slice(0,6)||"",o=n(f.DEVICE_ID+r),i=n(f.USER_ID+r),s=n(f.OPT_OUT+r);null!==s&&void 0!==s&&(s="true"===String(s));var a=parseInt(n(f.SESSION_ID)),u=parseInt(n(f.LAST_EVENT_TIME)),c=parseInt(n(f.LAST_EVENT_ID)),p=parseInt(n(f.LAST_IDENTIFY_ID)),l=parseInt(n(f.LAST_SEQUENCE_NUMBER)),d=function(e){return"object"===A(t)&&t[e]};e.options.deviceId=d("deviceId")||o,e.options.userId=d("userId")||i,e._sessionId=d("sessionId")||a||e._sessionId,e._lastEventTime=d("lastEventTime")||u||e._lastEventTime,e._eventId=d("eventId")||c||e._eventId,e._identifyId=d("identifyId")||p||e._identifyId,e._sequenceNumber=d("sequenceNumber")||l||e._sequenceNumber,e.options.optOut=s||!1,t&&void 0!==t.optOut&&null!==t.optOut&&(e.options.optOut="true"===String(t.optOut)),Kt(e)}},Gt=function(e){var t=e.cookieStorage.get(e.options.cookieName+e._storageSuffix);if("object"===A(t))Bt(e,t);else{var n=e.cookieStorage.get(e.options.cookieName+e._legacyStorageSuffix);"object"===A(n)&&(e.cookieStorage.remove(e.options.cookieName+e._legacyStorageSuffix),Bt(e,n))}},Bt=function(e,t){t.deviceId&&(e.options.deviceId=t.deviceId),t.userId&&(e.options.userId=t.userId),null!==t.optOut&&void 0!==t.optOut&&(e.options.optOut=t.optOut),t.sessionId&&(e._sessionId=parseInt(t.sessionId)),t.lastEventTime&&(e._lastEventTime=parseInt(t.lastEventTime)),t.eventId&&(e._eventId=parseInt(t.eventId)),t.identifyId&&(e._identifyId=parseInt(t.identifyId)),t.sequenceNumber&&(e._sequenceNumber=parseInt(t.sequenceNumber))},Kt=function(e){e.cookieStorage.set(e.options.cookieName+e._storageSuffix,{deviceId:e.options.deviceId,userId:e.options.userId,optOut:e.options.optOut,sessionId:e._sessionId,lastEventTime:e._lastEventTime,eventId:e._eventId,identifyId:e._identifyId,sequenceNumber:e._sequenceNumber})};qt.prototype._initUtmData=function(e,t){e=e||this._getUrlParams();var n=function(e,t){var n=e?"?"+e.split(".").slice(-1)[0].replace(/\|/g,"&"):"",r=function(e,t,n,r){return M.getQueryParam(e,t)||M.getQueryParam(n,r)},o=r("utm_source",t,"utmcsr",n),i=r("utm_medium",t,"utmcmd",n),s=r("utm_campaign",t,"utmccn",n),a=r("utm_term",t,"utmctr",n),u=r("utm_content",t,"utmcct",n),c={},p=function(e,t){M.isEmptyString(t)||(c[e]=t)};return p("utm_source",o),p("utm_medium",i),p("utm_campaign",s),p("utm_term",a),p("utm_content",u),c}(t=t||this.cookieStorage.get("__utmz"),e);zt(this,n)};var zt=function(e,t){if("object"===A(t)&&0!==Object.keys(t).length){var n=new Q;for(var r in t)t.hasOwnProperty(r)&&(n.setOnce("initial_"+r,t[r]),n.set(r,t[r]));e.identify(n)}};qt.prototype._getReferrer=function(){return document.referrer},qt.prototype._getUrlParams=function(){return location.search},qt.prototype._saveGclid=function(e){var t=M.getQueryParam("gclid",e);if(!M.isEmptyString(t)){zt(this,{gclid:t})}},qt.prototype._getDeviceIdFromUrlParam=function(e){return M.getQueryParam(f.AMP_DEVICE_ID_PARAM,e)},qt.prototype._getReferringDomain=function(e){if(M.isEmptyString(e))return null;var t=e.split("/");return t.length>=3?t[2]:null},qt.prototype._saveReferrer=function(e){if(!M.isEmptyString(e)){var t={referrer:e,referring_domain:this._getReferringDomain(e)};zt(this,t)}},qt.prototype.saveEvents=function(){try{this._setInStorage(W,this.options.unsentKey,JSON.stringify(this._unsentEvents))}catch(e){}try{this._setInStorage(W,this.options.unsentIdentifyKey,JSON.stringify(this._unsentIdentifys))}catch(e){}},qt.prototype.setDomain=function(e){if(M.validateInput(e,"domain","string"))try{this.cookieStorage.options({domain:e}),this.options.domain=this.cookieStorage.options().domain,Gt(this),Kt(this)}catch(e){M.log.error(e)}},qt.prototype.setUserId=function(e){try{this.options.userId=void 0!==e&&null!==e&&""+e||null,Kt(this)}catch(e){M.log.error(e)}},qt.prototype.setGroup=function(e,t){if(this._apiKeySet("setGroup()")&&M.validateInput(e,"groupType","string")&&!M.isEmptyString(e)){var n={};n[e]=t;var r=(new Q).set(e,t);this._logEvent(f.IDENTIFY_EVENT,null,null,r.userPropertiesOperations,n,null,null)}},qt.prototype.setOptOut=function(e){if(M.validateInput(e,"enable","boolean"))try{this.options.optOut=e,Kt(this)}catch(e){M.log.error(e)}},qt.prototype.setSessionId=function(e){if(M.validateInput(e,"sessionId","number"))try{this._sessionId=e,Kt(this)}catch(e){M.log.error(e)}},qt.prototype.regenerateDeviceId=function(){this.setDeviceId(Dt()+"R")},qt.prototype.setDeviceId=function(e){if(M.validateInput(e,"deviceId","string"))try{M.isEmptyString(e)||(this.options.deviceId=""+e,Kt(this))}catch(e){M.log.error(e)}},qt.prototype.setUserProperties=function(e){if(this._apiKeySet("setUserProperties()")&&M.validateInput(e,"userProperties","object")){var t=M.truncate(M.validateProperties(e));if(0!==Object.keys(t).length){var n=new Q;for(var r in t)t.hasOwnProperty(r)&&n.set(r,t[r]);this.identify(n)}}},qt.prototype.clearUserProperties=function(){if(this._apiKeySet("clearUserProperties()")){var e=new Q;e.clearAll(),this.identify(e)}};var Jt=function(e,t){for(var n=0;n<t._q.length;n++){var r=e[t._q[n][0]];"function"===A(r)&&r.apply(e,t._q[n].slice(1))}return e};qt.prototype.identify=function(e,t){if(this._apiKeySet("identify()")){if("object"===A(e)&&e.hasOwnProperty("_q")&&(e=Jt(new Q,e)),e instanceof Q){if(Object.keys(e.userPropertiesOperations).length>0)return this._logEvent(f.IDENTIFY_EVENT,null,null,e.userPropertiesOperations,null,null,t)}else M.log.error("Invalid identify input type. Expected Identify object but saw "+A(e));"function"===A(t)&&t(0,"No request sent")}else"function"===A(t)&&t(0,"No request sent")},qt.prototype.setVersionName=function(e){M.validateInput(e,"versionName","string")&&(this.options.versionName=e)},qt.prototype._logEvent=function(e,t,n,r,o,i,s){if(Gt(this),e&&!this.options.optOut)try{var a;a=e===f.IDENTIFY_EVENT?this.nextIdentifyId():this.nextEventId();var u=this.nextSequenceNumber(),c="number"===A(i)?i:(new Date).getTime();(!this._sessionId||!this._lastEventTime||c-this._lastEventTime>this.options.sessionTimeout)&&(this._sessionId=c),this._lastEventTime=c,Kt(this),r=r||{},n=n||{},t=t||{},o=o||{};var p={device_id:this.options.deviceId,user_id:this.options.userId,timestamp:c,event_id:a,session_id:this._sessionId||-1,event_type:e,version_name:this.options.versionName||null,platform:this.options.platform,os_name:this._ua.browser.name||null,os_version:this._ua.browser.major||null,device_model:this._ua.os.name||null,language:this.options.language,api_properties:n,event_properties:M.truncate(M.validateProperties(t)),user_properties:M.truncate(M.validateProperties(r)),uuid:Dt(),library:{name:"amplitude-js",version:"4.0.0"},sequence_number:u,groups:M.truncate(M.validateGroups(o)),user_agent:this._userAgent};return e===f.IDENTIFY_EVENT?(this._unsentIdentifys.push(p),this._limitEventsQueued(this._unsentIdentifys)):(this._unsentEvents.push(p),this._limitEventsQueued(this._unsentEvents)),this.options.saveEvents&&this.saveEvents(),this._sendEventsIfReady(s)||"function"!==A(s)||s(0,"No request sent"),a}catch(e){M.log.error(e)}else"function"===A(s)&&s(0,"No request sent")},qt.prototype._limitEventsQueued=function(e){e.length>this.options.savedMaxCount&&e.splice(0,e.length-this.options.savedMaxCount)},qt.prototype.logEvent=function(e,t,n){return this.logEventWithTimestamp(e,t,null,n)},qt.prototype.logEventWithTimestamp=function(e,t,n,r){return this._apiKeySet("logEvent()")&&M.validateInput(e,"eventType","string")&&!M.isEmptyString(e)?this._logEvent(e,t,null,null,null,n,r):("function"===A(r)&&r(0,"No request sent"),-1)},qt.prototype.logEventWithGroups=function(e,t,n,r){return this._apiKeySet("logEventWithGroup()")&&M.validateInput(e,"eventType","string")?this._logEvent(e,t,null,null,n,null,r):("function"===A(r)&&r(0,"No request sent"),-1)};var $t=function(e){return!isNaN(parseFloat(e))&&isFinite(e)};qt.prototype.logRevenueV2=function(e){if(this._apiKeySet("logRevenueV2()"))if("object"===A(e)&&e.hasOwnProperty("_q")&&(e=Jt(new Ft,e)),e instanceof Ft){if(e&&e._isValidRevenue())return this.logEvent(f.REVENUE_EVENT,e._toJSONObject())}else M.log.error("Invalid revenue input type. Expected Revenue object but saw "+A(e))},qt.prototype.logRevenue=function(e,t,n){return this._apiKeySet("logRevenue()")&&$t(e)&&(void 0===t||$t(t))?this._logEvent(f.REVENUE_EVENT,{},{productId:n,special:"revenue_amount",quantity:t||1,price:e},null,null,null,null):-1},qt.prototype.removeEvents=function(e,t){Wt(this,"_unsentEvents",e),Wt(this,"_unsentIdentifys",t)};var Wt=function(e,t,n){if(!(n<0)){for(var r=[],o=0;o<e[t].length;o++)e[t][o].event_id>n&&r.push(e[t][o]);e[t]=r}};qt.prototype.sendEvents=function(e){if(!this._apiKeySet("sendEvents()")||this._sending||this.options.optOut||0===this._unsentCount())"function"===A(e)&&e(0,"No request sent");else{this._sending=!0;var t=(this.options.forceHttps?"https":"https:"===window.location.protocol?"https":"http")+"://"+this.options.apiEndpoint+"/",n=Math.min(this._unsentCount(),this.options.uploadBatchSize),r=this._mergeEventsAndIdentifys(n),o=r.maxEventId,i=r.maxIdentifyId,s=JSON.stringify(r.eventsToSend),a=(new Date).getTime(),u={client:this.options.apiKey,e:s,v:f.API_VERSION,upload_time:a,checksum:X(f.API_VERSION+this.options.apiKey+s+a)},c=this;new Pt(t,u).send(function(t,r){c._sending=!1;try{200===t&&"success"===r?(c.removeEvents(o,i),c.options.saveEvents&&c.saveEvents(),c._sendEventsIfReady(e)||"function"!==A(e)||e(t,r)):413===t?(1===c.options.uploadBatchSize&&c.removeEvents(o,i),c.options.uploadBatchSize=Math.ceil(n/2),c.sendEvents(e)):"function"===A(e)&&e(t,r)}catch(e){}})}},qt.prototype._mergeEventsAndIdentifys=function(e){for(var t=[],n=0,r=-1,o=0,i=-1;t.length<e;){var s,a=o>=this._unsentIdentifys.length,u=n>=this._unsentEvents.length;if(u&&a){M.log.error("Merging Events and Identifys, less events and identifys than expected");break}a?r=(s=this._unsentEvents[n++]).event_id:u?i=(s=this._unsentIdentifys[o++]).event_id:!("sequence_number"in this._unsentEvents[n])||this._unsentEvents[n].sequence_number<this._unsentIdentifys[o].sequence_number?r=(s=this._unsentEvents[n++]).event_id:i=(s=this._unsentIdentifys[o++]).event_id,t.push(s)}return{eventsToSend:t,maxEventId:r,maxIdentifyId:i}},qt.prototype.setGlobalUserProperties=function(e){this.setUserProperties(e)},qt.prototype.__VERSION__="4.0.0";var Yt=function(){this.options=xt({},Mt),this._q=[],this._instances={}};Yt.prototype.Identify=Q,Yt.prototype.Revenue=Ft,Yt.prototype.getInstance=function(e){e=M.isEmptyString(e)?f.DEFAULT_INSTANCE:e.toLowerCase();var t=this._instances[e];return void 0===t&&(t=new qt(e),this._instances[e]=t),t},Yt.prototype.init=function(e,t,n,r){this.getInstance().init(e,t,n,function(e){this.options=e.options,"function"===A(r)&&r(e)}.bind(this))},Yt.prototype.runQueuedFunctions=function(){for(var e=0;e<this._q.length;e++){var t=this[this._q[e][0]];"function"===A(t)&&t.apply(this,this._q[e].slice(1))}this._q=[];for(var n in this._instances)this._instances.hasOwnProperty(n)&&this._instances[n].runQueuedFunctions()},Yt.prototype.isNewSession=function(){return this.getInstance().isNewSession()},Yt.prototype.getSessionId=function(){return this.getInstance().getSessionId()},Yt.prototype.nextEventId=function(){return this.getInstance().nextEventId()},Yt.prototype.nextIdentifyId=function(){return this.getInstance().nextIdentifyId()},Yt.prototype.nextSequenceNumber=function(){return this.getInstance().nextSequenceNumber()},Yt.prototype.saveEvents=function(){this.getInstance().saveEvents()},Yt.prototype.setDomain=function(e){this.getInstance().setDomain(e)},Yt.prototype.setUserId=function(e){this.getInstance().setUserId(e)},Yt.prototype.setGroup=function(e,t){this.getInstance().setGroup(e,t)},Yt.prototype.setOptOut=function(e){this.getInstance().setOptOut(e)},Yt.prototype.regenerateDeviceId=function(){this.getInstance().regenerateDeviceId()},Yt.prototype.setDeviceId=function(e){this.getInstance().setDeviceId(e)},Yt.prototype.setUserProperties=function(e){this.getInstance().setUserProperties(e)},Yt.prototype.clearUserProperties=function(){this.getInstance().clearUserProperties()},Yt.prototype.identify=function(e,t){this.getInstance().identify(e,t)},Yt.prototype.setVersionName=function(e){this.getInstance().setVersionName(e)},Yt.prototype.logEvent=function(e,t,n){return this.getInstance().logEvent(e,t,n)},Yt.prototype.logEventWithGroups=function(e,t,n,r){return this.getInstance().logEventWithGroups(e,t,n,r)},Yt.prototype.logRevenueV2=function(e){return this.getInstance().logRevenueV2(e)},Yt.prototype.logRevenue=function(e,t,n){return this.getInstance().logRevenue(e,t,n)},Yt.prototype.removeEvents=function(e,t){this.getInstance().removeEvents(e,t)},Yt.prototype.sendEvents=function(e){this.getInstance().sendEvents(e)},Yt.prototype.setGlobalUserProperties=function(e){this.getInstance().setUserProperties(e)},Yt.prototype.__VERSION__="4.0.0";var Qt=window.amplitude||{},Xt=new Yt;Xt._q=Qt._q||[];for(var Ht in Qt._iq)Qt._iq.hasOwnProperty(Ht)&&(Xt.getInstance(Ht)._q=Qt._iq[Ht]._q||[]);return Xt});
diff --git a/karma.conf.js b/karma.conf.js
index ce32c387..abcebeff 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -33,6 +33,9 @@ module.exports = function(config) {
     sauceLabs: {
       testName: 'Amplitude JavaScript SDK',
     },
+    preprocessors: {
+      '**/*.js': ['sourcemap']
+    },
     frameworks: ['mocha', 'chai', 'sinon'],
     files: ['amplitude-snippet.min.js', 'build/snippet-tests.js', 'build/tests.js'],
     reporters: ['mocha', 'saucelabs'],
diff --git a/package.json b/package.json
index c76683c0..3eba8196 100644
--- a/package.json
+++ b/package.json
@@ -33,6 +33,7 @@
     "karma-mocha": "^1.3.0",
     "karma-mocha-reporter": "^2.2.5",
     "karma-sauce-launcher": "^1.2.0",
+    "karma-sourcemap-loader": "^0.3.7",
     "karma-sinon": "^1.0.5",
     "mocha": "^4.0.1",
     "rollup": "^0.49.3",
diff --git a/rollup.test.js b/rollup.test.js
index d7e0d0f8..688addb7 100644
--- a/rollup.test.js
+++ b/rollup.test.js
@@ -2,5 +2,6 @@ import config from './rollup.config.js';
 
 config.input = 'test/tests.js';
 config.output.file = 'build/tests.js';
+config.output.sourcemap = true;
 
 export default config;
diff --git a/src/amplitude-client.js b/src/amplitude-client.js
index b66a0a93..742551d3 100644
--- a/src/amplitude-client.js
+++ b/src/amplitude-client.js
@@ -23,7 +23,7 @@ import DEFAULT_OPTIONS from './options';
  */
 var AmplitudeClient = function AmplitudeClient(instanceName) {
   this._instanceName = utils.isEmptyString(instanceName) ? Constants.DEFAULT_INSTANCE : instanceName.toLowerCase();
-  this._storageSuffix = this._instanceName === Constants.DEFAULT_INSTANCE ? '' : '_' + this._instanceName;
+  this._legacyStorageSuffix = this._instanceName === Constants.DEFAULT_INSTANCE ? '' : '_' + this._instanceName;
   this._unsentEvents = [];
   this._unsentIdentifys = [];
   this._ua = new UAParser(navigator.userAgent).getResult();
@@ -66,6 +66,7 @@ AmplitudeClient.prototype.init = function init(apiKey, opt_userId, opt_config, o
 
   try {
     this.options.apiKey = apiKey;
+    this._storageSuffix = '_' + apiKey + this._legacyStorageSuffix;
     _parseConfig(this.options, opt_config);
     this.cookieStorage.options({
       expirationDays: this.options.cookieExpiration,
@@ -221,6 +222,30 @@ AmplitudeClient.prototype._apiKeySet = function _apiKeySet(methodName) {
  */
 AmplitudeClient.prototype._loadSavedUnsentEvents = function _loadSavedUnsentEvents(unsentKey) {
   var savedUnsentEventsString = this._getFromStorage(localStorage, unsentKey);
+  var events = this._parseSavedUnsentEventsString(savedUnsentEventsString, unsentKey);
+
+  var savedUnsentEventsStringLegacy = this._getFromStorageLegacy(localStorage, unsentKey);
+  var legacyEvents = this._parseSavedUnsentEventsString(savedUnsentEventsStringLegacy, unsentKey);
+
+  var unsentEvents = legacyEvents.concat(events);
+
+  // Migrate legacy events out of storage
+  this._removeFromLegacyStorage(localStorage, unsentKey);
+  this._setInStorage(localStorage, unsentKey, JSON.stringify(unsentEvents));
+
+  return unsentEvents;
+};
+
+
+AmplitudeClient.prototype._removeFromLegacyStorage = function _removeFromLegacyStorage(storage, key) {
+  storage.removeItem(key + this._legacyStorageSuffix);
+};
+
+/**
+ * Load saved events from localStorage. JSON deserializes event array. Handles case where string is corrupted.
+ * @private
+ */
+AmplitudeClient.prototype._parseSavedUnsentEventsString = function _parseSavedUnsentEventsString(savedUnsentEventsString, unsentKey) {
   if (utils.isEmptyString(savedUnsentEventsString)) {
     return []; // new app, does not have any saved events
   }
@@ -333,6 +358,15 @@ AmplitudeClient.prototype._getFromStorage = function _getFromStorage(storage, ke
   return storage.getItem(key + this._storageSuffix);
 };
 
+/**
+ * Helper function to fetch values from storage
+ * Storage argument allows for localStoraoge and sessionStoraoge
+ * @private
+ */
+AmplitudeClient.prototype._getFromStorageLegacy = function _getFromStorageLegacy(storage, key) {
+  return storage.getItem(key + this._legacyStorageSuffix);
+};
+
 /**
  * Helper function to set values in storage
  * Storage argument allows for localStoraoge and sessionStoraoge
@@ -350,7 +384,7 @@ AmplitudeClient.prototype._setInStorage = function _setInStorage(storage, key, v
  */
 var _upgradeCookeData = function _upgradeCookeData(scope) {
   // skip if migration already happened
-  var cookieData = scope.cookieStorage.get(scope.options.cookieName);
+  var cookieData = scope.cookieStorage.get(scope.options.cookieName + scope._storageSuffix);
   if (type(cookieData) === 'object' && cookieData.deviceId && cookieData.sessionId && cookieData.lastEventTime) {
     return;
   }
@@ -403,34 +437,45 @@ var _upgradeCookeData = function _upgradeCookeData(scope) {
  */
 var _loadCookieData = function _loadCookieData(scope) {
   var cookieData = scope.cookieStorage.get(scope.options.cookieName + scope._storageSuffix);
+
   if (type(cookieData) === 'object') {
-    if (cookieData.deviceId) {
-      scope.options.deviceId = cookieData.deviceId;
-    }
-    if (cookieData.userId) {
-      scope.options.userId = cookieData.userId;
-    }
-    if (cookieData.optOut !== null && cookieData.optOut !== undefined) {
-      scope.options.optOut = cookieData.optOut;
-    }
-    if (cookieData.sessionId) {
-      scope._sessionId = parseInt(cookieData.sessionId);
-    }
-    if (cookieData.lastEventTime) {
-      scope._lastEventTime = parseInt(cookieData.lastEventTime);
-    }
-    if (cookieData.eventId) {
-      scope._eventId = parseInt(cookieData.eventId);
-    }
-    if (cookieData.identifyId) {
-      scope._identifyId = parseInt(cookieData.identifyId);
-    }
-    if (cookieData.sequenceNumber) {
-      scope._sequenceNumber = parseInt(cookieData.sequenceNumber);
+    _loadCookieDataProps(scope, cookieData);
+  } else {
+    var legacyCookieData = scope.cookieStorage.get(scope.options.cookieName + scope._legacyStorageSuffix);
+    if (type(legacyCookieData) === 'object') {
+      scope.cookieStorage.remove(scope.options.cookieName + scope._legacyStorageSuffix);
+      _loadCookieDataProps(scope, legacyCookieData);
     }
   }
 };
 
+var _loadCookieDataProps = function _loadCookieDataProps(scope, cookieData) {
+  if (cookieData.deviceId) {
+    scope.options.deviceId = cookieData.deviceId;
+  }
+  if (cookieData.userId) {
+    scope.options.userId = cookieData.userId;
+  }
+  if (cookieData.optOut !== null && cookieData.optOut !== undefined) {
+    scope.options.optOut = cookieData.optOut;
+  }
+  if (cookieData.sessionId) {
+    scope._sessionId = parseInt(cookieData.sessionId);
+  }
+  if (cookieData.lastEventTime) {
+    scope._lastEventTime = parseInt(cookieData.lastEventTime);
+  }
+  if (cookieData.eventId) {
+    scope._eventId = parseInt(cookieData.eventId);
+  }
+  if (cookieData.identifyId) {
+    scope._identifyId = parseInt(cookieData.identifyId);
+  }
+  if (cookieData.sequenceNumber) {
+    scope._sequenceNumber = parseInt(cookieData.sequenceNumber);
+  }
+};
+
 /**
  * Saves deviceId, userId, event meta data to amplitude cookie
  * @private
diff --git a/test/amplitude-client.js b/test/amplitude-client.js
index 740b7e46..6d178b3c 100644
--- a/test/amplitude-client.js
+++ b/test/amplitude-client.js
@@ -108,7 +108,7 @@ describe('AmplitudeClient', function() {
 
     it('should set cookie', function() {
       amplitude.init(apiKey, userId);
-      var stored = cookie.get(amplitude.options.cookieName);
+      var stored = cookie.get(amplitude.options.cookieName + '_' + apiKey);
       assert.property(stored, 'deviceId');
       assert.propertyVal(stored, 'userId', userId);
       assert.lengthOf(stored.deviceId, 37); // increase deviceId length by 1 for 'R' character
@@ -144,7 +144,7 @@ describe('AmplitudeClient', function() {
       amplitude.init(apiKey, userId, {deviceIdFromUrlParam: true});
       assert.equal(amplitude.options.deviceId, deviceId);
 
-      var cookieData = cookie.get(amplitude.options.cookieName);
+      var cookieData = cookie.get(amplitude.options.cookieName + '_' + apiKey);
       assert.equal(cookieData.deviceId, deviceId);
 
       amplitude._getUrlParams.restore();
@@ -156,7 +156,7 @@ describe('AmplitudeClient', function() {
       amplitude.init(apiKey, userId, {deviceIdFromUrlParam: false});
       assert.notEqual(amplitude.options.deviceId, deviceId);
 
-      var cookieData = cookie.get(amplitude.options.cookieName);
+      var cookieData = cookie.get(amplitude.options.cookieName + '_' + apiKey);
       assert.notEqual(cookieData.deviceId, deviceId);
 
       amplitude._getUrlParams.restore();
@@ -168,7 +168,7 @@ describe('AmplitudeClient', function() {
       amplitude.init(apiKey, userId, {deviceId: deviceId, deviceIdFromUrlParam: true});
       assert.equal(amplitude.options.deviceId, deviceId);
 
-      var cookieData = cookie.get(amplitude.options.cookieName);
+      var cookieData = cookie.get(amplitude.options.cookieName + '_' + apiKey);
       assert.equal(cookieData.deviceId, deviceId);
 
       amplitude._getUrlParams.restore();
@@ -188,7 +188,7 @@ describe('AmplitudeClient', function() {
       assert.equal(amplitude.options.userId, userId);
       assert.isTrue(amplitude.options.optOut);
 
-      var cookieData = cookie.get(amplitude.options.cookieName);
+      var cookieData = cookie.get(amplitude.options.cookieName + '_' + apiKey);
       assert.equal(cookieData.deviceId, deviceId);
       assert.equal(cookieData.userId, userId);
       assert.isTrue(cookieData.optOut);
@@ -209,7 +209,7 @@ describe('AmplitudeClient', function() {
       assert.isNull(amplitude2.options.userId);
       assert.isFalse(amplitude2.options.optOut);
 
-      var cookieData = cookie.get(amplitude.options.cookieName + '_new_app');
+      var cookieData = cookie.get(amplitude.options.cookieName + '_' + apiKey + '_new_app');
       assert.equal(cookieData.deviceId, amplitude2.options.deviceId);
       assert.isNull(cookieData.userId);
       assert.isFalse(cookieData.optOut);
@@ -233,7 +233,7 @@ describe('AmplitudeClient', function() {
       assert.equal(amplitude._identifyId, 4000);
       assert.equal(amplitude._sequenceNumber, 5000);
 
-      var cookieData = cookie.get(amplitude.options.cookieName);
+      var cookieData = cookie.get(amplitude.options.cookieName + '_' + apiKey);
       assert.equal(cookieData.sessionId, now);
       assert.equal(cookieData.lastEventTime, amplitude._lastEventTime);
       assert.equal(cookieData.eventId, 3000);
@@ -254,7 +254,7 @@ describe('AmplitudeClient', function() {
         identifyId: 60
       }
 
-      cookie.set(amplitude.options.cookieName, cookieData);
+      cookie.set(amplitude.options.cookieName + '_' + apiKey, cookieData);
       localStorage.setItem('amplitude_deviceId' + keySuffix, 'old_device_id');
       localStorage.setItem('amplitude_userId' + keySuffix, 'fake_user_id');
       localStorage.setItem('amplitude_optOut' + keySuffix, true);
@@ -278,7 +278,7 @@ describe('AmplitudeClient', function() {
     it('should skip the migration if the new cookie already has deviceId, sessionId, lastEventTime', function() {
       var now = new Date().getTime();
 
-      cookie.set(amplitude.options.cookieName, {
+      cookie.set(amplitude.options.cookieName + '_' + apiKey, {
         deviceId: 'new_device_id',
         sessionId: now,
         lastEventTime: now
@@ -305,7 +305,7 @@ describe('AmplitudeClient', function() {
     });
 
     it('should save cookie data to localStorage if cookies are not enabled', function() {
-      var cookieStorageKey = 'amp_cookiestore_amplitude_id';
+      var cookieStorageKey = 'amp_cookiestore_amplitude_id_' + apiKey;
       var deviceId = 'test_device_id';
       var clock = sinon.useFakeTimers();
       clock.tick(1000);
@@ -417,13 +417,13 @@ describe('AmplitudeClient', function() {
         '"event_id":49,"session_id":1453763315544,"event_type":"clicked","version_name":"Web","platform":"Web"' +
         ',"os_name":"Chrome","os_version":"47","device_model":"Mac","language":"en-US","api_properties":{},' +
         '"event_properties":{},"user_properties":{},"uuid":"3c508faa-a5c9-45fa-9da7-9f4f3b992fb0","library"' +
-        ':{"name":"amplitude-js","version":"2.9.0"},"sequence_number":130, "groups":{}}]';
+        ':{"name":"amplitude-js","version":"2.9.0"},"sequence_number":130,"groups":{}}]';
       var existingIdentify = '[{"device_id":"test_device_id","user_id":"test_user_id","timestamp":1453769338995,' +
         '"event_id":82,"session_id":1453763315544,"event_type":"$identify","version_name":"Web","platform":"Web"' +
         ',"os_name":"Chrome","os_version":"47","device_model":"Mac","language":"en-US","api_properties":{},' +
         '"event_properties":{},"user_properties":{"$set":{"age":30,"city":"San Francisco, CA"}},"uuid":"' +
         'c50e1be4-7976-436a-aa25-d9ee38951082","library":{"name":"amplitude-js","version":"2.9.0"},"sequence_number"' +
-        ':131, "groups":{}}]';
+        ':131,"groups":{}}]';
       localStorage.setItem('amplitude_unsent', existingEvent);
       localStorage.setItem('amplitude_unsent_identify', existingIdentify);
 
@@ -435,8 +435,8 @@ describe('AmplitudeClient', function() {
       assert.deepEqual(amplitude2._unsentIdentifys, JSON.parse(existingIdentify));
 
       // check local storage keys are still same for default instance
-      assert.equal(localStorage.getItem('amplitude_unsent'), existingEvent);
-      assert.equal(localStorage.getItem('amplitude_unsent_identify'), existingIdentify);
+      assert.equal(localStorage.getItem('amplitude_unsent_' + apiKey), existingEvent);
+      assert.equal(localStorage.getItem('amplitude_unsent_identify_' + apiKey), existingIdentify);
     });
 
     it('should load saved events for non-default instances', function() {
@@ -444,13 +444,13 @@ describe('AmplitudeClient', function() {
         '"event_id":49,"session_id":1453763315544,"event_type":"clicked","version_name":"Web","platform":"Web"' +
         ',"os_name":"Chrome","os_version":"47","device_model":"Mac","language":"en-US","api_properties":{},' +
         '"event_properties":{},"user_properties":{},"uuid":"3c508faa-a5c9-45fa-9da7-9f4f3b992fb0","library"' +
-        ':{"name":"amplitude-js","version":"2.9.0"},"sequence_number":130, "groups":{}}]';
+        ':{"name":"amplitude-js","version":"2.9.0"},"sequence_number":130,"groups":{}}]';
       var existingIdentify = '[{"device_id":"test_device_id","user_id":"test_user_id","timestamp":1453769338995,' +
         '"event_id":82,"session_id":1453763315544,"event_type":"$identify","version_name":"Web","platform":"Web"' +
         ',"os_name":"Chrome","os_version":"47","device_model":"Mac","language":"en-US","api_properties":{},' +
         '"event_properties":{},"user_properties":{"$set":{"age":30,"city":"San Francisco, CA"}},"uuid":"' +
         'c50e1be4-7976-436a-aa25-d9ee38951082","library":{"name":"amplitude-js","version":"2.9.0"},"sequence_number"' +
-        ':131, "groups":{}}]';
+        ':131,"groups":{}}]';
       localStorage.setItem('amplitude_unsent_new_app', existingEvent);
       localStorage.setItem('amplitude_unsent_identify_new_app', existingIdentify);
       assert.isNull(localStorage.getItem('amplitude_unsent'));
@@ -464,8 +464,8 @@ describe('AmplitudeClient', function() {
       assert.deepEqual(amplitude2._unsentIdentifys, JSON.parse(existingIdentify));
 
       // check local storage keys are still same
-      assert.equal(localStorage.getItem('amplitude_unsent_new_app'), existingEvent);
-      assert.equal(localStorage.getItem('amplitude_unsent_identify_new_app'), existingIdentify);
+      assert.equal(localStorage.getItem('amplitude_unsent_' + apiKey +'_new_app'), existingEvent);
+      assert.equal(localStorage.getItem('amplitude_unsent_identify_' + apiKey + '_new_app'), existingIdentify);
     });
 
     it('should validate event properties when loading saved events from localStorage', function() {
@@ -554,8 +554,8 @@ describe('AmplitudeClient', function() {
       assert.deepEqual(amplitude2._unsentIdentifys, []);
 
       // check local storage keys are still same
-      assert.equal(localStorage.getItem('amplitude_unsent'), JSON.stringify([]));
-      assert.equal(localStorage.getItem('amplitude_unsent_identify'), JSON.stringify([]));
+      assert.equal(localStorage.getItem('amplitude_unsent_' + apiKey), JSON.stringify([]));
+      assert.equal(localStorage.getItem('amplitude_unsent_identify_' + apiKey), JSON.stringify([]));
 
       // check request
       assert.lengthOf(server.requests, 1);
@@ -590,8 +590,8 @@ it ('should load saved events from localStorage new keys and send events', funct
       assert.deepEqual(amplitude2._unsentIdentifys, []);
 
       // check local storage keys are still same
-      assert.equal(localStorage.getItem('amplitude_unsent_new_app'), JSON.stringify([]));
-      assert.equal(localStorage.getItem('amplitude_unsent_identify_new_app'), JSON.stringify([]));
+      assert.equal(localStorage.getItem('amplitude_unsent_' + apiKey + '_new_app'), JSON.stringify([]));
+      assert.equal(localStorage.getItem('amplitude_unsent_identify_' + apiKey + '_new_app'), JSON.stringify([]));
 
       // check request
       assert.lengthOf(server.requests, 1);
@@ -657,10 +657,10 @@ it ('should load saved events from localStorage new keys and send events', funct
         '"event_properties":{},"user_properties":{"$set":{"age":30,"city":"San Francisco, CA"}},"uuid":"' +
         'c50e1be4-7976-436a-aa25-d9ee38951082","library":{"name":"amplitude-js","version":"2.9.0"},"sequence_number"' +
         ':131}]';
-      localStorage.setItem('amplitude_unsent', existingEvent);
-      localStorage.setItem('amplitude_unsent_identify', existingIdentify);
-      assert.isNull(localStorage.getItem('amplitude_unsent_new_app'));
-      assert.isNull(localStorage.getItem('amplitude_unsent_identify_new_app'));
+      localStorage.setItem('amplitude_unsent_' + apiKey, existingEvent);
+      localStorage.setItem('amplitude_unsent_identify_' + apiKey, existingIdentify);
+      assert.isNull(localStorage.getItem('amplitude_unsent_' + apiKey + '_new_app'));
+      assert.isNull(localStorage.getItem('amplitude_unsent_identify_' + apiKey + '_new_app'));
 
       var amplitude2 = new AmplitudeClient('new_app');
       amplitude2.init(apiKey, null, {batchEvents: true, eventUploadThreshold: 2});
@@ -670,10 +670,10 @@ it ('should load saved events from localStorage new keys and send events', funct
       assert.deepEqual(amplitude2._unsentIdentifys, []);
 
       // check local storage
-      assert.equal(localStorage.getItem('amplitude_unsent'), existingEvent);
-      assert.equal(localStorage.getItem('amplitude_unsent_identify'), existingIdentify);
-      assert.isNull(localStorage.getItem('amplitude_unsent_new_app'));
-      assert.isNull(localStorage.getItem('amplitude_unsent_identify_new_app'));
+      assert.equal(localStorage.getItem('amplitude_unsent_' + apiKey), existingEvent);
+      assert.equal(localStorage.getItem('amplitude_unsent_identify_' + apiKey), existingIdentify);
+      assert.equal(localStorage.getItem('amplitude_unsent_' + apiKey + '_new_app'), '[]');
+      assert.equal(localStorage.getItem('amplitude_unsent_identify_' + apiKey + '_new_app'), '[]');
 
       // check request
       assert.lengthOf(server.requests, 0);
@@ -891,7 +891,7 @@ describe('setVersionName', function() {
     it('should store device id in cookie', function() {
       amplitude.init(apiKey, null, {'deviceId': 'fakeDeviceId'});
       amplitude.setDeviceId('deviceId');
-      var stored = cookie.get(amplitude.options.cookieName);
+      var stored = cookie.get(amplitude.options.cookieName + '_' + apiKey);
       assert.propertyVal(stored, 'deviceId', 'deviceId');
     });
   });
@@ -1904,7 +1904,7 @@ describe('setVersionName', function() {
       clock.tick(20);
       amplitude2.setUserProperties({'key':'value'}); // identify event at time 30
 
-      var cookieData = JSON.parse(localStorage.getItem('amp_cookiestore_amplitude_id'));
+      var cookieData = JSON.parse(localStorage.getItem('amp_cookiestore_amplitude_id_' + apiKey));
       assert.deepEqual(cookieData, {
         'deviceId': deviceId,
         'userId': null,
@@ -2757,7 +2757,7 @@ describe('setVersionName', function() {
       assert.equal(amplitude2._sessionId, sessionId);
       assert.equal(amplitude2.getSessionId(), sessionId);
       assert.equal(amplitude2.getSessionId(), amplitude2._sessionId);
-      assert.equal(cookieStorage.get(amplitude2.options.cookieName).sessionId, sessionId);
+      assert.equal(cookieStorage.get(amplitude2.options.cookieName + '_' + apiKey).sessionId, sessionId);
 
       // override sessionId with setSessionId
       var newSessionId = 10000;
@@ -2765,7 +2765,7 @@ describe('setVersionName', function() {
       assert.equal(amplitude2._sessionId, newSessionId);
       assert.equal(amplitude2.getSessionId(), newSessionId);
       assert.equal(amplitude2.getSessionId(), amplitude2._sessionId);
-      assert.equal(cookieStorage.get(amplitude2.options.cookieName).sessionId, newSessionId);
+      assert.equal(cookieStorage.get(amplitude2.options.cookieName + '_' + apiKey).sessionId, newSessionId);
     });
   });
 });
diff --git a/test/amplitude.js b/test/amplitude.js
index 884ef23f..a771d060 100644
--- a/test/amplitude.js
+++ b/test/amplitude.js
@@ -35,8 +35,9 @@ describe('Amplitude', function() {
     sessionStorage.clear();
     cookie.remove(amplitude.options.cookieName);
     cookie.remove(amplitude.options.cookieName + keySuffix);
-    cookie.remove(amplitude.options.cookieName + '_app1');
-    cookie.remove(amplitude.options.cookieName + '_app2');
+    cookie.remove(amplitude.options.cookieName + '_' + apiKey);
+    cookie.remove(amplitude.options.cookieName + '_1_app1');
+    cookie.remove(amplitude.options.cookieName + '_2_app2');
     cookie.reset();
   }
 
@@ -134,20 +135,20 @@ describe('Amplitude', function() {
 
       // verify separate localstorages
       assert.deepEqual(
-        JSON.parse(localStorage.getItem('amplitude_unsent'))[0].event_type, 'amplitude event'
+        JSON.parse(localStorage.getItem('amplitude_unsent_' + apiKey))[0].event_type, 'amplitude event'
       );
       assert.deepEqual(
-        JSON.parse(localStorage.getItem('amplitude_unsent'))[1].event_type, 'amplitude event2'
+        JSON.parse(localStorage.getItem('amplitude_unsent_' + apiKey))[1].event_type, 'amplitude event2'
       );
-      assert.equal(localStorage.getItem('amplitude_unsent_identify'), JSON.stringify([]));
-      assert.equal(localStorage.getItem('amplitude_unsent_app1'), JSON.stringify([]));
+      assert.equal(localStorage.getItem('amplitude_unsent_identify_' + apiKey), JSON.stringify([]));
+      assert.equal(localStorage.getItem('amplitude_unsent_1_app1'), JSON.stringify([]));
       assert.deepEqual(
-        JSON.parse(localStorage.getItem('amplitude_unsent_identify_app1'))[0].user_properties, {'$set':{'key':'value'}}
+        JSON.parse(localStorage.getItem('amplitude_unsent_identify_1_app1'))[0].user_properties, {'$set':{'key':'value'}}
       );
       assert.equal(
-        JSON.parse(localStorage.getItem('amplitude_unsent_app2'))[0].event_type, 'app2 event'
+        JSON.parse(localStorage.getItem('amplitude_unsent_2_app2'))[0].event_type, 'app2 event'
       );
-      assert.equal(localStorage.getItem('amplitude_unsent_identify_app2'), JSON.stringify([]));
+      assert.equal(localStorage.getItem('amplitude_unsent_identify_2_app2'), JSON.stringify([]));
 
       // verify separate apiKeys in server requests
       assert.lengthOf(server.requests, 3);
@@ -155,13 +156,13 @@ describe('Amplitude', function() {
       assert.equal(JSON.parse(querystring.parse(server.requests[2].requestBody).client), 2);
 
       // verify separate cookie data
-      var cookieData = cookie.get(amplitude.options.cookieName);
+      var cookieData = cookie.get(amplitude.options.cookieName + '_' + apiKey);
       assert.equal(cookieData.deviceId, amplitude.options.deviceId);
 
-      var cookieData1 = cookie.get(app1.options.cookieName + '_app1');
+      var cookieData1 = cookie.get(app1.options.cookieName + '_1_app1');
       assert.equal(cookieData1.deviceId, app1.options.deviceId);
 
-      var cookieData2 = cookie.get(app2.options.cookieName + '_app2');
+      var cookieData2 = cookie.get(app2.options.cookieName + '_2_app2');
       assert.equal(cookieData2.deviceId, app2.options.deviceId);
     });
 
@@ -178,7 +179,7 @@ describe('Amplitude', function() {
         identifyId: 60,
         sequenceNumber: 70
       }
-      cookie.set(amplitude.options.cookieName, cookieData);
+      cookie.set(amplitude.options.cookieName + '_' + apiKey, cookieData);
 
       // default instance loads from existing cookie
       var app = amplitude.getInstance();
@@ -197,7 +198,6 @@ describe('Amplitude', function() {
       assert.notEqual(app1.options.deviceId, 'test_device_id');
       assert.isNull(app1.options.userId);
       assert.isFalse(app1.options.optOut);
-      console.log(app1._sessionId);
       assert.isTrue(app1._sessionId >= now);
       assert.isTrue(app1._lastEventTime >= now);
       assert.equal(app1._eventId, 0);
@@ -274,7 +274,7 @@ describe('Amplitude', function() {
 
     it('should set cookie', function() {
       amplitude.init(apiKey, userId);
-      var stored = cookie.get(amplitude.options.cookieName);
+      var stored = cookie.get(amplitude.options.cookieName + '_' + apiKey);
       assert.property(stored, 'deviceId');
       assert.propertyVal(stored, 'userId', userId);
       assert.lengthOf(stored.deviceId, 37); // increase deviceId length by 1 for 'R' character
@@ -318,7 +318,7 @@ describe('Amplitude', function() {
       assert.equal(amplitude.options.userId, userId);
       assert.isTrue(amplitude.options.optOut);
 
-      var cookieData = cookie.get(amplitude.options.cookieName);
+      var cookieData = cookie.get(amplitude.options.cookieName + '_' + apiKey);
       assert.equal(cookieData.deviceId, deviceId);
       assert.equal(cookieData.userId, userId);
       assert.isTrue(cookieData.optOut);
@@ -342,7 +342,7 @@ describe('Amplitude', function() {
       assert.equal(amplitude.getInstance()._identifyId, 4000);
       assert.equal(amplitude.getInstance()._sequenceNumber, 5000);
 
-      var cookieData = cookie.get(amplitude.options.cookieName);
+      var cookieData = cookie.get(amplitude.options.cookieName + '_' + apiKey);
       assert.equal(cookieData.sessionId, now);
       assert.equal(cookieData.lastEventTime, amplitude.getInstance()._lastEventTime);
       assert.equal(cookieData.eventId, 3000);
@@ -363,7 +363,7 @@ describe('Amplitude', function() {
         identifyId: 60
       }
 
-      cookie.set(amplitude.options.cookieName, cookieData);
+      cookie.set(amplitude.options.cookieName + '_' + apiKey, cookieData);
       localStorage.setItem('amplitude_deviceId' + keySuffix, 'old_device_id');
       localStorage.setItem('amplitude_userId' + keySuffix, 'fake_user_id');
       localStorage.setItem('amplitude_optOut' + keySuffix, true);
@@ -387,7 +387,7 @@ describe('Amplitude', function() {
     it('should skip the migration if the new cookie already has deviceId, sessionId, lastEventTime', function() {
       var now = new Date().getTime();
 
-      cookie.set(amplitude.options.cookieName, {
+      cookie.set(amplitude.options.cookieName + '_' + apiKey, {
         deviceId: 'new_device_id',
         sessionId: now,
         lastEventTime: now
@@ -493,18 +493,45 @@ describe('Amplitude', function() {
       assert.equal(amplitude2.getInstance()._sequenceNumber, 70);
     });
 
+    it('should load saved events from legacy localStorage', function() {
+      var existingEvent = '[{"device_id":"test_device_id","user_id":"test_user_id","timestamp":1453769146589,' +
+        '"event_id":49,"session_id":1453763315544,"event_type":"clicked","version_name":"Web","platform":"Web"' +
+        ',"os_name":"Chrome","os_version":"47","device_model":"Mac","language":"en-US","api_properties":{},' +
+        '"event_properties":{},"user_properties":{},"uuid":"3c508faa-a5c9-45fa-9da7-9f4f3b992fb0","library"' +
+        ':{"name":"amplitude-js","version":"2.9.0"},"sequence_number":130,"groups":{}}]';
+      var existingIdentify = '[{"device_id":"test_device_id","user_id":"test_user_id","timestamp":1453769338995,' +
+        '"event_id":82,"session_id":1453763315544,"event_type":"$identify","version_name":"Web","platform":"Web"' +
+        ',"os_name":"Chrome","os_version":"47","device_model":"Mac","language":"en-US","api_properties":{},' +
+        '"event_properties":{},"user_properties":{"$set":{"age":30,"city":"San Francisco, CA"}},"uuid":"' +
+        'c50e1be4-7976-436a-aa25-d9ee38951082","library":{"name":"amplitude-js","version":"2.9.0"},"sequence_number"' +
+        ':131,"groups":{}}]';
+      localStorage.setItem('amplitude_unsent', existingEvent);
+      localStorage.setItem('amplitude_unsent_identify', existingIdentify);
+
+      var amplitude2 = new Amplitude();
+      amplitude2.init(apiKey, null, {batchEvents: true});
+
+      // check event loaded into memory
+      assert.deepEqual(amplitude2.getInstance()._unsentEvents, JSON.parse(existingEvent));
+      assert.deepEqual(amplitude2.getInstance()._unsentIdentifys, JSON.parse(existingIdentify));
+
+      // check local storage keys are still same for default instance
+      assert.equal(localStorage.getItem('amplitude_unsent_' + apiKey), existingEvent);
+      assert.equal(localStorage.getItem('amplitude_unsent_identify_' + apiKey), existingIdentify);
+    });
+
     it('should load saved events from localStorage', function() {
       var existingEvent = '[{"device_id":"test_device_id","user_id":"test_user_id","timestamp":1453769146589,' +
         '"event_id":49,"session_id":1453763315544,"event_type":"clicked","version_name":"Web","platform":"Web"' +
         ',"os_name":"Chrome","os_version":"47","device_model":"Mac","language":"en-US","api_properties":{},' +
         '"event_properties":{},"user_properties":{},"uuid":"3c508faa-a5c9-45fa-9da7-9f4f3b992fb0","library"' +
-        ':{"name":"amplitude-js","version":"2.9.0"},"sequence_number":130, "groups":{}}]';
+        ':{"name":"amplitude-js","version":"2.9.0"},"sequence_number":130,"groups":{}}]';
       var existingIdentify = '[{"device_id":"test_device_id","user_id":"test_user_id","timestamp":1453769338995,' +
         '"event_id":82,"session_id":1453763315544,"event_type":"$identify","version_name":"Web","platform":"Web"' +
         ',"os_name":"Chrome","os_version":"47","device_model":"Mac","language":"en-US","api_properties":{},' +
         '"event_properties":{},"user_properties":{"$set":{"age":30,"city":"San Francisco, CA"}},"uuid":"' +
         'c50e1be4-7976-436a-aa25-d9ee38951082","library":{"name":"amplitude-js","version":"2.9.0"},"sequence_number"' +
-        ':131, "groups":{}}]';
+        ':131,"groups":{}}]';
       localStorage.setItem('amplitude_unsent', existingEvent);
       localStorage.setItem('amplitude_unsent_identify', existingIdentify);
 
@@ -516,8 +543,8 @@ describe('Amplitude', function() {
       assert.deepEqual(amplitude2.getInstance()._unsentIdentifys, JSON.parse(existingIdentify));
 
       // check local storage keys are still same for default instance
-      assert.equal(localStorage.getItem('amplitude_unsent'), existingEvent);
-      assert.equal(localStorage.getItem('amplitude_unsent_identify'), existingIdentify);
+      assert.equal(localStorage.getItem('amplitude_unsent_' + apiKey), existingEvent);
+      assert.equal(localStorage.getItem('amplitude_unsent_identify_' + apiKey), existingIdentify);
     });
 
     it('should validate event properties when loading saved events from localStorage', function() {
@@ -606,8 +633,8 @@ describe('Amplitude', function() {
       assert.deepEqual(amplitude2.getInstance()._unsentIdentifys, []);
 
       // check local storage keys are still same
-      assert.equal(localStorage.getItem('amplitude_unsent'), JSON.stringify([]));
-      assert.equal(localStorage.getItem('amplitude_unsent_identify'), JSON.stringify([]));
+      assert.equal(localStorage.getItem('amplitude_unsent_' + apiKey), JSON.stringify([]));
+      assert.equal(localStorage.getItem('amplitude_unsent_identify_' + apiKey), JSON.stringify([]));
 
       // check request
       assert.lengthOf(server.requests, 1);
@@ -873,7 +900,7 @@ describe('setVersionName', function() {
     it('should store device id in cookie', function() {
       amplitude.init(apiKey, null, {'deviceId': 'fakeDeviceId'});
       amplitude.setDeviceId('deviceId');
-      var stored = cookie.get(amplitude.options.cookieName);
+      var stored = cookie.get(amplitude.options.cookieName + '_' + apiKey);
       assert.propertyVal(stored, 'deviceId', 'deviceId');
     });
   });
@@ -1886,7 +1913,7 @@ describe('setVersionName', function() {
       clock.tick(20);
       amplitude2.setUserProperties({'key':'value'}); // identify event at time 30
 
-      var cookieData = JSON.parse(localStorage.getItem('amp_cookiestore_amplitude_id'));
+      var cookieData = JSON.parse(localStorage.getItem('amp_cookiestore_amplitude_id_' + apiKey));
       assert.deepEqual(cookieData, {
         'deviceId': deviceId,
         'userId': null,
diff --git a/yarn.lock b/yarn.lock
index 3d9cb527..8bc09627 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2186,6 +2186,12 @@ karma-sinon@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/karma-sinon/-/karma-sinon-1.0.5.tgz#4e3443f2830fdecff624d3747163f1217daa2a9a"
 
+karma-sourcemap-loader@^0.3.7:
+  version "0.3.7"
+  resolved "https://registry.yarnpkg.com/karma-sourcemap-loader/-/karma-sourcemap-loader-0.3.7.tgz#91322c77f8f13d46fed062b042e1009d4c4505d8"
+  dependencies:
+    graceful-fs "^4.1.2"
+
 karma@^1.7.1:
   version "1.7.1"
   resolved "https://registry.yarnpkg.com/karma/-/karma-1.7.1.tgz#85cc08e9e0a22d7ce9cca37c4a1be824f6a2b1ae"