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Microsoft Azure Monitor Application Insights JavaScript SDK - Azure Monitor

The Microsoft Azure Monitor Application Insights JavaScript SDK collects usage data, which allows you to monitor and analyze the performance of JavaScript web applications. This is commonly referred to as Real User Monitoring or RUM.

The Application Insights JavaScript SDK has a base SDK and several plugins for more capabilities.

Follow the steps in this section to instrument your application with the Application Insights JavaScript SDK.

Two methods are available to add the code to enable Application Insights via the Application Insights JavaScript SDK:

  1. Paste the JavaScript (Web) SDK Loader Script at the top of each page for which you want to enable Application Insights.

    Preferably, you should add it as the first script in your <head> section so that it can monitor any potential issues with all of your dependencies.

    If Internet Explorer 8 is detected, JavaScript SDK v2.x is automatically loaded.

    <script type="text/javascript">
!(function (cfg){function e(){cfg.onInit&&cfg.onInit(n)}var x,w,D,t,E,n,C=window,O=document,b=C.location,q="script",I="ingestionendpoint",L="disableExceptionTracking",j="ai.device.";"instrumentationKey"[x="toLowerCase"](),w="crossOrigin",D="POST",t="appInsightsSDK",E=cfg.name||"appInsights",(cfg.name||C[t])&&(C[t]=E),n=C[E]||function(g){var f=!1,m=!1,h={initialize:!0,queue:[],sv:"8",version:2,config:g};function v(e,t){var n={},i="Browser";function a(e){e=""+e;return 1===e.length?"0"+e:e}return n[j+"id"]=i[x](),n[j+"type"]=i,n["ai.operation.name"]=b&&b.pathname||"_unknown_",n["ai.internal.sdkVersion"]="javascript:snippet_"+(h.sv||h.version),{time:(i=new Date).getUTCFullYear()+"-"+a(1+i.getUTCMonth())+"-"+a(i.getUTCDate())+"T"+a(i.getUTCHours())+":"+a(i.getUTCMinutes())+":"+a(i.getUTCSeconds())+"."+(i.getUTCMilliseconds()/1e3).toFixed(3).slice(2,5)+"Z",iKey:e,name:"Microsoft.ApplicationInsights."+e.replace(/-/g,"")+"."+t,sampleRate:100,tags:n,data:{baseData:{ver:2}},ver:undefined,seq:"1",aiDataContract:undefined}}var n,i,t,a,y=-1,T=0,S=["js.monitor.azure.com","js.cdn.applicationinsights.io","js.cdn.monitor.azure.com","js0.cdn.applicationinsights.io","js0.cdn.monitor.azure.com","js2.cdn.applicationinsights.io","js2.cdn.monitor.azure.com","az416426.vo.msecnd.net"],o=g.url||cfg.src,r=function(){return s(o,null)};function s(d,t){if((n=navigator)&&(~(n=(n.userAgent||"").toLowerCase()).indexOf("msie")||~n.indexOf("trident/"))&&~d.indexOf("ai.3")&&(d=d.replace(/(\/)(ai\.3\.)([^\d]*)$/,function(e,t,n){return t+"ai.2"+n})),!1!==cfg.cr)for(var e=0;e<S.length;e++)if(0<d.indexOf(S[e])){y=e;break}var n,i=function(e){var a,t,n,i,o,r,s,c,u,l;h.queue=[],m||(0<=y&&T+1<S.length?(a=(y+T+1)%S.length,p(d.replace(/^(.*\/\/)([\w\.]*)(\/.*)$/,function(e,t,n,i){return t+S[a]+i})),T+=1):(f=m=!0,s=d,!0!==cfg.dle&&(c=(t=function(){var e,t={},n=g.connectionString;if(n)for(var i=n.split(";"),a=0;a<i.length;a++){var o=i[a].split("=");2===o.length&&(t[o[0][x]()]=o[1])}return t[I]||(e=(n=t.endpointsuffix)?t.location:null,t[I]="https://"+(e?e+".":"")+"dc."+(n||"services.visualstudio.com")),t}()).instrumentationkey||g.instrumentationKey||"",t=(t=(t=t[I])&&"/"===t.slice(-1)?t.slice(0,-1):t)?t+"/v2/track":g.endpointUrl,t=g.userOverrideEndpointUrl||t,(n=[]).push((i="SDK LOAD Failure: Failed to load Application Insights SDK script (See stack for details)",o=s,u=t,(l=(r=v(c,"Exception")).data).baseType="ExceptionData",l.baseData.exceptions=[{typeName:"SDKLoadFailed",message:i.replace(/\./g,"-"),hasFullStack:!1,stack:i+"\nSnippet failed to load ["+o+"] -- Telemetry is disabled\nHelp Link: https://go.microsoft.com/fwlink/?linkid=2128109\nHost: "+(b&&b.pathname||"_unknown_")+"\nEndpoint: "+u,parsedStack:[]}],r)),n.push((l=s,i=t,(u=(o=v(c,"Message")).data).baseType="MessageData",(r=u.baseData).message='AI (Internal): 99 message:"'+("SDK LOAD Failure: Failed to load Application Insights SDK script (See stack for details) ("+l+")").replace(/\"/g,"")+'"',r.properties={endpoint:i},o)),s=n,c=t,JSON&&((u=C.fetch)&&!cfg.useXhr?u(c,{method:D,body:JSON.stringify(s),mode:"cors"}):XMLHttpRequest&&((l=new XMLHttpRequest).open(D,c),l.setRequestHeader("Content-type","application/json"),l.send(JSON.stringify(s)))))))},a=function(e,t){m||setTimeout(function(){!t&&h.core||i()},500),f=!1},p=function(e){var n=O.createElement(q),e=(n.src=e,t&&(n.integrity=t),n.setAttribute("data-ai-name",E),cfg[w]);return!e&&""!==e||"undefined"==n[w]||(n[w]=e),n.onload=a,n.onerror=i,n.onreadystatechange=function(e,t){"loaded"!==n.readyState&&"complete"!==n.readyState||a(0,t)},cfg.ld&&cfg.ld<0?O.getElementsByTagName("head")[0].appendChild(n):setTimeout(function(){O.getElementsByTagName(q)[0].parentNode.appendChild(n)},cfg.ld||0),n};p(d)}cfg.sri&&(n=o.match(/^((http[s]?:\/\/.*\/)\w+(\.\d+){1,5})\.(([\w]+\.){0,2}js)$/))&&6===n.length?(d="".concat(n[1],".integrity.json"),i="@".concat(n[4]),l=window.fetch,t=function(e){if(!e.ext||!e.ext[i]||!e.ext[i].file)throw Error("Error Loading JSON response");var t=e.ext[i].integrity||null;s(o=n[2]+e.ext[i].file,t)},l&&!cfg.useXhr?l(d,{method:"GET",mode:"cors"}).then(function(e){return e.json()["catch"](function(){return{}})}).then(t)["catch"](r):XMLHttpRequest&&((a=new XMLHttpRequest).open("GET",d),a.onreadystatechange=function(){if(a.readyState===XMLHttpRequest.DONE)if(200===a.status)try{t(JSON.parse(a.responseText))}catch(e){r()}else r()},a.send())):o&&r();try{h.cookie=O.cookie}catch(k){}function e(e){for(;e.length;)!function(t){h[t]=function(){var e=arguments;f||h.queue.push(function(){h[t].apply(h,e)})}}(e.pop())}var c,u,l="track",d="TrackPage",p="TrackEvent",l=(e([l+"Event",l+"PageView",l+"Exception",l+"Trace",l+"DependencyData",l+"Metric",l+"PageViewPerformance","start"+d,"stop"+d,"start"+p,"stop"+p,"addTelemetryInitializer","setAuthenticatedUserContext","clearAuthenticatedUserContext","flush"]),h.SeverityLevel={Verbose:0,Information:1,Warning:2,Error:3,Critical:4},(g.extensionConfig||{}).ApplicationInsightsAnalytics||{});return!0!==g[L]&&!0!==l[L]&&(e(["_"+(c="onerror")]),u=C[c],C[c]=function(e,t,n,i,a){var o=u&&u(e,t,n,i,a);return!0!==o&&h["_"+c]({message:e,url:t,lineNumber:n,columnNumber:i,error:a,evt:C.event}),o},g.autoExceptionInstrumented=!0),h}(cfg.cfg),(C[E]=n).queue&&0===n.queue.length?(n.queue.push(e),n.trackPageView({})):e();})({
  src: "https://js.monitor.azure.com/scripts/b/ai.3.gbl.min.js",
  // name: "appInsights", // Global SDK Instance name defaults to "appInsights" when not supplied
  // ld: 0, // Defines the load delay (in ms) before attempting to load the sdk. -1 = block page load and add to head. (default) = 0ms load after timeout,
  // useXhr: 1, // Use XHR instead of fetch to report failures (if available),
  // dle: true, // Prevent the SDK from reporting load failure log
  crossOrigin: "anonymous", // When supplied this will add the provided value as the cross origin attribute on the script tag
  // onInit: null, // Once the application insights instance has loaded and initialized this callback function will be called with 1 argument -- the sdk instance (DON'T ADD anything to the sdk.queue -- As they won't get called)
  // sri: false, // Custom optional value to specify whether fetching the snippet from integrity file and do integrity check
  cfg: { // Application Insights Configuration
    connectionString: "YOUR_CONNECTION_STRING"
}});
</script>

  2. (Optional) Add or update optional JavaScript (Web) SDK Loader Script configuration, if you need to optimize the loading of your web page or resolve loading errors.

JavaScript (Web) SDK Loader Script configuration Name Type Required? Description src string Required The full URL for where to load the SDK from. This value is used for the "src" attribute of a dynamically added <script /> tag. You can use the public CDN location or your own privately hosted one. name string Optional The global name for the initialized SDK. Use this setting if you need to initialize two different SDKs at the same time.

The default value is appInsights, so window.appInsights is a reference to the initialized instance.

Note: If you assign a name value or if a previous instance is assigned to the global name appInsightsSDK, the SDK initialization code requires it to be in the global namespace as window.appInsightsSDK=<name value> to ensure the correct JavaScript (Web) SDK Loader Script skeleton, and proxy methods are initialized and updated.

ld number in ms Optional Defines the load delay to wait before attempting to load the SDK. Use this setting when the HTML page is failing to load because the JavaScript (Web) SDK Loader Script is loading at the wrong time.

The default value is 0ms after timeout. If you use a negative value, the script tag is immediately added to the <head> region of the page and blocks the page load event until the script is loaded or fails.

useXhr boolean Optional This setting is used only for reporting SDK load failures. For example, this setting is useful when the JavaScript (Web) SDK Loader Script is preventing the HTML page from loading, causing fetch() to be unavailable.

Reporting first attempts to use fetch() if available and then fallback to XHR. Set this setting to true to bypass the fetch check. This setting is necessary only in environments where fetch can't transmit failure events, for example, when the JavaScript (Web) SDK Loader Script fails to load successfully.

crossOrigin string Optional By including this setting, the script tag added to download the SDK includes the crossOrigin attribute with this string value. Use this setting when you need to provide support for CORS. When not defined (the default), no crossOrigin attribute is added. Recommended values aren't defined (the default), "", or "anonymous". For all valid values, see the cross origin HTML attribute documentation. onInit function(aiSdk) { ... } Optional This callback function is called after the main SDK script is successfully loaded and initialized from the CDN (based on the src value). This callback function is useful when you need to insert a telemetry initializer. It's passed one argument, which is a reference to the SDK instance that's being called for and is also called before the first initial page view. If the SDK is already loaded and initialized, this callback is still called. NOTE: During the processing of the sdk.queue array, this callback is called. You can't add any more items to the queue because they're ignored and dropped. (Added as part of JavaScript (Web) SDK Loader Script version 5--the sv:"5" value within the script). cr boolean Optional If the SDK fails to load and the endpoint value defined for src is the public CDN location, this configuration option attempts to immediately load the SDK from one of the following backup CDN endpoints: NOTE: az416426.vo.msecnd.net is partially supported, so it's not recommended.

If the SDK successfully loads from a backup CDN endpoint, it loads from the first available one, which is determined when the server performs a successful load check. If the SDK fails to load from any of the backup CDN endpoints, the SDK Failure error message appears.

When not defined, the default value is true. If you don't want to load the SDK from the backup CDN endpoints, set this configuration option to false.

If you're loading the SDK from your own privately hosted CDN endpoint, this configuration option isn't applicable.

  1. Use the following command to install the Microsoft Application Insights JavaScript SDK - Web package.

    npm i --save @microsoft/applicationinsights-web

    Typings are included with this package, so you don't need to install a separate typings package.

  2. Add the following JavaScript to your application's code.

    Where and also how you add this JavaScript code depends on your application code. For example, you might be able to add it exactly as it appears below or you may need to create wrappers around it.

    import { ApplicationInsights } from '@microsoft/applicationinsights-web'

const appInsights = new ApplicationInsights({ config: {
  connectionString: 'YOUR_CONNECTION_STRING'
  /* ...Other Configuration Options... */
} });
appInsights.loadAppInsights();
appInsights.trackPageView();

The optional SDK configuration is passed to the Application Insights JavaScript SDK during initialization.

To add SDK configuration, add each configuration option directly under connectionString. For example:

If you want to use the extra features provided by plugins for specific frameworks and optionally enable the Click Analytics plug-in, see:

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