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JavaScript Errors | @DevOpsSummit @Dynatrace #JavaScript #AI #WebPerf

How to monitor JavaScript errors using Real User Monitoring

The Impact of JavaScript Errors

These days we are moving more and more logic towards the user into the browser to achieve higher performance and better user experience. There are Single Page Application frameworks like AngularJS, React, Ember and others supporting this trend. If it works, everything is fine. But with this trend a JavaScript error can become a website killer. What does this mean? Below you can see the same page twice, but depending on the browser used, you get a product list from which you can make a selection…or NOT! The difference is the result of a simple JavaScript error.

Figure 1: JavaScript error causing a product search to return no result

Here is another example of an online email interface showing a list of contacts, or in this case NONE, due again to a simple JavaScript error. JavaScript errors today can ruin the user experience of a web applications.

Figure 2: Empty contact list due to JavaScript error

But having found the page showing the problem is is a significant step toward solving a JavaScript error. What happened before would be a long investigation triggered by the occasional customer complaint actually received. Why a long investigation? Because the input obtained from support often looks like this:

“Customer XYZ is not able to click on the product in the search list. He is using his Android phone”

This information is not useful in finding the problem and fixing the JavaScript error. This will probably lead to another ticket that will close with “Cannot reproduce!” after the team tries the most common browsers, some click combinations, and maybe different search terms. It is frustrating and neither you nor the customer ever get a solution. So how can you get out of this frustrating “JavaScript error” cycle?

Step 1: Get visibility into JavaScript errors
Real User Monitoring
solutions like Dynatrace today can capture all users and all their interactions on a page. They can also capture JavaScript errors, providing an overview of all errors occurring on a web application. With the impact today’s JavaScript errors have, this insight is mandatory for operating modern web applications. It allows you to see the impact of new app version deployments and if changes to third-party JavaScript libraries are causing issues. In screenshot below, we can see that the application is massively impacted with ~100 JavaScript errors/min after a new version of the app was deployed.

Figure 3: JavaScript error overview showing the number of errors per minute and the top JavaScript errors

Step 2: Narrow down the JavaScript error playground
Even better than simply having the JavaScript error count helping us to prioritize which issue to fix first, is automatically obtaining a narrowed down environment for the JavaScript errors. This allows us to immediately determine on exactly which page the error occurs, if there is a specific location, or a specific operating system impacted as seen in the example below.

Figure 4: The Dynatrace automatic analysis for JavaScript errors is providing usefull information to narrow down the error environment

This is already a great insight that would have made my day years ago, but now let’s get super fancy in the year 2017!

Step 3: Make the JavaScript Stack trace human readable (Source Maps)
Since we are minifying for better performance, our JavaScript files become unreadable once deployed. Source map files help developers figure out what the original code looked like. For more information about source map files review this blog. To help developers leverage those capabilities for Real User Monitoring (RUM) and fix errors faster, Dynatrace allows you to upload the source map files, automatically generating a human readable JavaScript file. The below example shows how this looks in the product where step by step we are getting more visibility depending on availability of Source Maps, minfied JavaScript files or the original source file.

Figure 5: Generic JavaScript error telling us the error occurs in line #1 character 42

Figure 6: Adding the source map file we can see that the error occurs in line #9 character 14

Figure 7: Leveraging the minfied file, we can at least get insight into what the code does

Figure 8: Adding the JavaScript source file we can see the original code at line #9 character 14

Step 5: Reproducing the JavaScript error leveraging the user’s clickpath
The final step to get to the bottom of a JavaScript error is to reproduce the error. This can be tricky, and is where Dynatrace user session tracking supports excels. In addition to the specific JavaScript error instance, it allows you to obtain the user journey with the click steps leading up to the error. The screenshot below shows such a journey where, after the first five steps, the user had a JavaScript error.

Figure 9: Click path of a user session with the JavaScript error makes it easy to reproduce the error

Conclusion
Today JavaScript errors are impacting web applications more than ever. The good news is that being proactive and reducing the number of JavaScript errors is easier through improvements to real-user monitoring. By reducing the number of JavaScript errors, you can improve the user experience and make your day easier by not having to chase JavaScript errors without context. This will hopefully free up enough time for you to do fun things like develop cool new capabilities into your web applications. As always, if you want to get started check out Dynatrace today.

The post The impact of JavaScript errors and How to monitor JavaScript errors using Real User Monitoring! appeared first on Dynatrace blog – monitoring redefined.

@DevOpsSummit at Cloud Expo taking place June 6-8, 2017, at Javits Center, New York City, and is co-located with the 20th International Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world.

DevOps at Cloud Expo / @ThingsExpo 2017 New York 
(June 6-8, 2017, Javits Center, Manhattan)

DevOps at Cloud Expo / @ThingsExpo 2017 Silicon Valley
(October 31 - November 2, 2017, Santa Clara Convention Center, CA)

Download Show Prospectus ▸ Here

The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to wait for long development cycles that produce software that is obsolete at launch. DevOps may be disruptive, but it is essential.

@DevOpsSummit will expand the DevOps community, enable a wide sharing of knowledge, and educate delegates and technology providers alike. Recent research has shown that DevOps dramatically reduces development time, the amount of enterprise IT professionals put out fires, and support time generally. Time spent on infrastructure development is significantly increased, and DevOps practitioners report more software releases and higher quality. Sponsors of @DevOpsSummit will benefit from unmatched branding, profile building and lead generation opportunities through:

  • Featured on-site presentation and ongoing on-demand webcast exposure to a captive audience of industry decision-makers.
  • Showcase exhibition during our new extended dedicated expo hours
  • Breakout Session Priority scheduling for Sponsors that have been guaranteed a 35-minute technical session
  • Online advertising in SYS-CON's i-Technology Publications
  • Capitalize on our Comprehensive Marketing efforts leading up to the show with print mailings, e-newsletters and extensive online media coverage.
  • Unprecedented PR Coverage: Editorial Coverage on DevOps Journal
  • Tweetup to over 75,000 plus followers
  • Press releases sent on major wire services to over 500 industry analysts.

For more information on sponsorship, exhibit, and keynote opportunities, contact Carmen Gonzalez by email at events (at) sys-con.com, or by phone 201 802-3021.

The World's Largest "Cloud Digital Transformation" Event

@CloudExpo / @ThingsExpo 2017 New York 
(June 6-8, 2017, Javits Center, Manhattan)

@CloudExpo / @ThingsExpo 2017 Silicon Valley
(Oct. 31 - Nov. 2, 2017, Santa Clara Convention Center, CA)

Full Conference Registration Gold Pass and Exhibit Hall ▸ Here

Register For @CloudExpo ▸ Here via EventBrite

Register For @ThingsExpo ▸ Here via EventBrite

Register For @DevOpsSummit ▸ Here via EventBrite

Sponsorship Opportunities

Sponsors of Cloud Expo @ThingsExpo will benefit from unmatched branding, profile building and lead generation opportunities through:

  • Featured on-site presentation and ongoing on-demand webcast exposure to a captive audience of industry decision-makers
  • Showcase exhibition during our new extended dedicated expo hours
  • Breakout Session Priority scheduling for Sponsors that have been guaranteed a 35 minute technical session
  • Online targeted advertising in SYS-CON's i-Technology Publications
  • Capitalize on our Comprehensive Marketing efforts leading up to the show with print mailings, e-newsletters and extensive online media coverage
  • Unprecedented Marketing Coverage: Editorial Coverage on ITweetup to over 100,000 plus followers, press releases sent on major wire services to over 500 industry analysts

For more information on sponsorship, exhibit, and keynote opportunities, contact Carmen Gonzalez (@GonzalezCarmen) today by email at events (at) sys-con.com, or by phone 201 802-3021.

Secrets of Sponsors and Exhibitors ▸ Here
Secrets of Cloud Expo Speakers ▸ Here

All major researchers estimate there will be tens of billions devices - computers, smartphones, tablets, and sensors - connected to the Internet by 2020. This number will continue to grow at a rapid pace for the next several decades.

With major technology companies and startups seriously embracing Cloud strategies, now is the perfect time to attend @CloudExpo@ThingsExpo, June 6-8, 2017, at the Javits Center in New York City, NY and October 31 - November 2, 2017, Santa Clara Convention Center, CA. Learn what is going on, contribute to the discussions, and ensure that your enterprise is on the right path to Digital Transformation.

Track 1. FinTech
Track 2. Enterprise Cloud | Digital Transformation
Track 3. DevOps, Containers & Microservices 
Track 4. Big Data | Analytics
Track 5. Industrial IoT
Track 6. IoT Dev & Deploy | Mobility
Track 7. APIs | Cloud Security
Track 8. AI | ML | DL | Cognitive Computing

Delegates to Cloud Expo @ThingsExpo will be able to attend 8 simultaneous, information-packed education tracks.

There are over 120 breakout sessions in all, with Keynotes, General Sessions, and Power Panels adding to three days of incredibly rich presentations and content.

Join Cloud Expo @ThingsExpo conference chair Roger Strukhoff (@IoT2040), June 6-8, 2017, at the Javits Center in New York City, NY and October 31 - November 2, 2017, Santa Clara Convention Center, CA for three days of intense Enterprise Cloud and 'Digital Transformation' discussion and focus, including Big Data's indispensable role in IoT, Smart Grids and (IIoT) Industrial Internet of Things, Wearables and Consumer IoT, as well as (new) Digital Transformation in Vertical Markets.

Financial Technology - or FinTech - Is Now Part of the @CloudExpo Program!

Accordingly, attendees at the upcoming 20th Cloud Expo @ThingsExpo June 6-8, 2017, at the Javits Center in New York City, NY and October 31 - November 2, 2017, Santa Clara Convention Center, CA will find fresh new content in a new track called FinTech, which will incorporate machine learning, artificial intelligence, deep learning, and blockchain into one track.

Financial enterprises in New York City, London, Singapore, and other world financial capitals are embracing a new generation of smart, automated FinTech that eliminates many cumbersome, slow, and expensive intermediate processes from their businesses.

FinTech brings efficiency as well as the ability to deliver new services and a much improved customer experience throughout the global financial services industry. FinTech is a natural fit with cloud computing, as new services are quickly developed, deployed, and scaled on public, private, and hybrid clouds.

More than US$20 billion in venture capital is being invested in FinTech this year. @CloudExpo is pleased to bring you the latest FinTech developments as an integral part of our program, starting at the 20th International Cloud Expo June 6-8, 2017 in New York City and October 31 - November 2, 2017 in Silicon Valley.

@CloudExpo is accepting submissions for this new track, so please visit www.CloudComputingExpo.com for the latest information.

Speaking Opportunities

The upcoming 20th International @CloudExpo@ThingsExpo, June 6-8, 2017, at the Javits Center in New York City, NY and October 31 - November 2, 2017, Santa Clara Convention Center, CA announces that its Call For Papers for speaking opportunities is open.

Submit your speaking proposal today! ▸ Here

Our Top 100 Sponsors and the Leading "Digital Transformation" Companies

(ISC)2, 24Notion (Bronze Sponsor), 910Telecom, Accelertite (Gold Sponsor), Addteq, Adobe (Bronze Sponsor), Aeroybyte, Alert Logic, Anexia, AppNeta, Avere Systems, BMC Software (Silver Sponsor), Bsquare Corporation (Silver Sponsor), BZ Media (Media Sponsor), Catchpoint Systems (Silver Sponsor), CDS Global Cloud, Cemware, Chetu Inc., China Unicom, Cloud Raxak, CloudBerry (Media Sponsor), Cloudbric, Coalfire Systems, CollabNet, Inc. (Silver Sponsor), Column Technologies, Commvault (Bronze Sponsor), Connect2.me, ContentMX (Bronze Sponsor), CrowdReviews (Media Sponsor) CyberTrend (Media Sponsor), DataCenterDynamics (Media Sponsor), Delaplex, DICE (Bronze Sponsor), EastBanc Technologies, eCube Systems, Embotics, Enzu Inc., Ericsson (Gold Sponsor), FalconStor, Formation Data Systems, Fusion, Hanu Software, HGST, Inc. (Bronze Sponsor), Hitrons Solutions, IBM BlueBox, IBM Bluemix, IBM Cloud (Platinum Sponsor), IBM Cloud Data Services/Cloudant (Platinum Sponsor), IBM DevOps (Platinum Sponsor), iDevices, Industrial Internet of Things Consortium (Association Sponsor), Impinger Technologies, Interface Masters, Intel (Keynote Sponsor), Interoute (Bronze Sponsor), IQP Corporation, Isomorphic Software, Japan IoT Consortium, Kintone Corporation (Bronze Sponsor), LeaseWeb USA, LinearHub, MangoApps, MathFreeOn, Men & Mice, MobiDev, New Relic, Inc. (Bronze Sponsor), New York Times, Niagara Networks, Numerex, NVIDIA Corporation (AI Session Sponsor), Object Management Group (Association Sponsor), On The Avenue Marketing, Oracle MySQL, Peak10, Inc., Penta Security, Plasma Corporation, Pulzze Systems, Pythian (Bronze Sponsor), Cosmos, RackN, ReadyTalk (Silver Sponsor), Roma Software, Roundee.io, Secure Channels Inc., SD Times (Media Sponsor), SoftLayer (Platinum Sponsor), SoftNet Solutions, Solinea Inc., SpeedyCloud, SSLGURU LLC, StarNet, Stratoscale, Streamliner, SuperAdmins, TechTarget (Media Sponsor), TelecomReseller (Media Sponsor), Tintri (Welcome Reception Sponsor), TMCnet (Media Sponsor), Transparent Cloud Computing Consortium, Veeam, Venafi, Violin Memory, VAI Software, Zerto

About SYS-CON Media & Events
SYS-CON Media (www.sys-con.com) has since 1994 been connecting technology companies and customers through a comprehensive content stream - featuring over forty focused subject areas, from Cloud Computing to Web Security - interwoven with market-leading full-scale conferences produced by SYS-CON Events. The company's internationally recognized brands include among others Cloud Expo® (@CloudExpo), Big Data Expo® (@BigDataExpo), DevOps Summit (@DevOpsSummit), @ThingsExpo® (@ThingsExpo), Containers Expo (@ContainersExpo) and Microservices Expo (@MicroservicesE).

Cloud Expo®, Big Data Expo® and @ThingsExpo® are registered trademarks of Cloud Expo, Inc., a SYS-CON Events company.

More Stories By Klaus Enzenhofer

Klaus Enzenhofer has several years of experience and expertise in the field of Web Performance Optimization and User Experience Management. He works as Technical Strategist in the Center of Excellence Team at dynaTrace Software. In this role he influences the development of the dynaTrace Application Performance Management Solution and the Web Performance Optimization Tool dynaTrace AJAX Edition. He mainly gathered his experience in web and performance by developing and running large-scale web portals at Tiscover GmbH.

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