While looking into an issue with Microsoft Edge and the Facebook sdk a few weeks ago, we ran into a very common error: Cannot read property ‘length’ of undefined. In fact, this is the 6th most common error, affecting nearly 28% of accounts.
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Nothing changed in your code. All of a sudden, a tidal wave of errors start happening for Microsoft Edge users. What the heck happened? On August 28th, 2019, many TrackJS customers saw a sudden surge in errors from Microsoft Edge browsers: Failed to construct 'Request': Invalid Argument and Fail...
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Recently, we ran into a scary looking error message in the Chrome console, Refused to get unsafe header "TrackJS-Correlation-Id". Our code was indeed trying to read this header from a request, so we explored this right away. The funny thing is, other than the error message in Chrome, everything w...
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We understand the value of JavaScript error monitoring here at TrackJS. Consequently, we run TrackJS on all of our own web properties to log our JS errors. We’re dilligent about fixing errors as they happen, and most issues are caught in development environments, or immediately in production. Ho...
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Empty String. An infuriatingly vague error message that leaves few clues about what’s going wrong. A customer recently experienced a lot of these, and asked for our help debugging it. This is that story.
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Redux is an amazing JavaScript library that has become mainstream because of its simplicity, tiny 2kb size, and excellent documentation. Redux assists developers to manage state in JavaScript applications and ensure it performs consistently, regardless of the environment. However, despite Redux’...
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Internet Explorer 11 crashes when JSON.stringify is called on an HTMLFormElement that contains duplicate named inputs. This is particularly concerning because radio inputs will certainly have duplicate names.
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The web is a hostile place and our JavaScript apps will inevitably break. Browser changes, invasive plugins, unstable networks, or just plain bugs—something is going to go wrong. When it does, we need to be ready. We need to know what went wrong and how to fix it or our users just won’t come back.
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The HTMLFormElement is weird. Although it was designed to make working with forms easier in the early days of the web, there are many subtle problems and inconsistencies that create nasty JavaScript bugs.
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In Mozilla Firefox, a request to load an external origin was attempted and externally blocked. The request could have been canceled by a browser extension, such as an adblocker or antivirus, or because the remote origin did not return a proper CORS response.
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A webkit bug that shipped in iOS 8 beta 5 and appears to have been partially included in the launch of iOS 8 and 8.1 is affecting many of our customers. It does not seem to impact all iOS8 uniformly; different versions of webkit seem to be involved.
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