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TrackJS
@trackjs.com
24 followers 4 following 17 posts
JavaScript Error Monitoring.
The fastest and easiest way to make your website better.

👉 https://trackjs.com/
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trackjs.com
"Right side of assignment cannot be destructured" is Safari's way of saying you tried to destructure null or undefined. Chrome tells you which property failed. Safari makes you guess.

trackjs.com/javascript-errors/right-side-of-assignment-cannot-be-destructured/

#javascript #webdev
How to fix `Right side of assignment cannot be destructured`
Safari's error message when destructuring null or undefined values. Common with API responses, missing function arguments, or async data not yet loaded. Quick fixes: add fallback objects, use optional...
trackjs.com
January 7, 2026 at 4:00 PM
trackjs.com
Seeing a sudden spike of 404 errors for ads.txt, security.txt, and /.well-known/ files? It's probably @httparchive.org Almanac scanning with WebPageTest

Not a bug, just bot noise.

trackjs.com/javascript-e...

#javascript #webdev
How to fix 404 Errors from WebPageTest.org Bot
404 errors from WebPageTest.org bot checking for well-known configuration files like ads.txt, security.txt, and sellers.json. Appears in JavaScript error monitoring because WebPageTest uses real Chrom...
trackjs.com
December 23, 2025 at 5:42 PM
trackjs.com
"Cannot read properties of null (reading 'length')" is everywhere. That null tells you something: an API returned "not found." Here's how to track it down and fix it.

trackjs.com/javascript-errors/cannot-read-properties-of-null-reading-length/

#javascript #webdev
How to fix `Cannot read properties of null (reading 'length')`
Common JavaScript error when accessing length on null values. Usually caused by DOM APIs like getElementById or querySelector returning null when elements don't exist, or localStorage returning null f...
trackjs.com
December 18, 2025 at 5:59 PM
trackjs.com
The worst JavaScript errors are the ones you can't see.

"Invalid or unexpected token" usually means invisible characters snuck into your code. Smart quotes from Slack, zero-width spaces, BOM markers.

trackjs.com/javascript-e...

#javascript #webdev
How to fix `Invalid or unexpected token`
JavaScript parser error when it encounters unrecognizable characters. Usually caused by invisible Unicode characters, smart quotes from copy-paste, or BOM markers. Different from "Unexpected token X" ...
trackjs.com
December 11, 2025 at 3:54 PM
trackjs.com
Safari's "string did not match the expected pattern" is infuriating. One vague message for five different problems. CSS selectors, JSON parsing, DOM values, all the same unhelpful text.

trackjs.com/javascript-e...

#JavaScript #Safari
How to fix "The string did not match the expected pattern."
Safari's generic error when DOM APIs receive invalid string arguments. Triggers include invalid CSS selectors, JSON parsing failures, contentEditable with bad values, and Performance.measure() issues....
trackjs.com
December 4, 2025 at 7:23 PM
trackjs.com
Most JavaScript errors in your monitoring dashboard are garbage. Browser extensions, ad blockers, crawlers. Here's how I set up TrackJS to ignore the noise and only alert on real bugs that matter.

www.youtube.com/watch?v=HBaZ...

#javascript #errormonitoring
Installing TrackJS on CertKit
YouTube video by TrackJS
www.youtube.com
November 24, 2025 at 4:29 PM
trackjs.com
Your JavaScript tried to use localStorage in a sandboxed iframe and now the browser is yelling at you.

"The operation is insecure" is rarely a real bug, it's just browsers being paranoid about security contexts.

trackjs.com/javascript-errors/the-operation-is-insecure/

#JavaScript #WebDev
How to fix `The operation is insecure`
Browser security error when JavaScript attempts restricted operations in non-secure contexts. Common with localStorage in iframes, geolocation on HTTP, or cross-origin operations. Quick fixes: use HTT...
trackjs.com
November 21, 2025 at 7:55 PM
trackjs.com
Your monitoring dashboard flooded with Facebook Privacy Sandbox errors? They're not bugs. They're privacy tools doing their job. Stop wasting time fixing user privacy choices.

trackjs.com/javascript-e...

#JavaScript #WebDev
How to fix `Failed to fetch: Facebook Privacy Sandbox`
Network error when Facebook's Topics API registration fails. Common with ad blockers and privacy extensions. Topics is Facebook's implementation of Privacy Sandbox interest-based advertising. No user ...
trackjs.com
November 10, 2025 at 6:19 PM
trackjs.com
MetaMask throwing connection errors in your logs? You're not alone. These extension errors pollute your monitoring with noise that isn't even your fault. We show you how to filter them out automatically.

Read more: trackjs.com/javascript-e...

#JavaScript #WebDev
How to fix `Failed to connect to MetaMask`
Browser extension error from visitors using MetaMask cryptocurrency wallet. Extension attempts to inject Web3 functionality into all pages, causing errors unrelated to your site. Safe to ignore via er...
trackjs.com
November 6, 2025 at 4:43 PM
trackjs.com
$ is not defined.
I have seen this error so many times. Here's how to fix it.

trackjs.com/javascript-e...
How to fix `$ is not defined`
Common JavaScript error when jQuery code runs before the library loads. Usually caused by script ordering issues, CDN failures, or async loading problems. Quick fixes: check script order, add fallback...
trackjs.com
October 22, 2025 at 7:30 PM
Reposted by TrackJS
toddhgardner.com
I have no idea if this works, but I did my very first Press Release today!

I'm not really sure what to expect with it -- probably nothing lol. But I think we're doing something really interesting with @certkit.io .

www.einpresswire.com/article/8583...
CA Alternative Launches Free Beta for 47-Day Certificate Lifetime Reduction
Platform enables Let's Encrypt free certificates at scale, replacing expensive enterprise tools and error-prone scripts ahead of certificate lifespan reductions
www.einpresswire.com
October 15, 2025 at 5:49 PM
trackjs.com
I wrote up a debug log on one of my "favorite" errors of all time: Unexpected Token: '<'

It's currently the #15 most common error on the Internet.
trackjs.com/javascript-e...

#javascript #webdev #debugging
How to fix `Unexpected token '<'`
This SyntaxError happens when code tries to parse HTML as JSON. Usually your API returned an HTML error page (like a 503 gateway error) instead of the JSON data you expected. Here's how to handle it p...
trackjs.com
October 16, 2025 at 6:30 PM
trackjs.com
Eric from TrackJS talks through the design process of the 2025 reskin project.

youtube.com/shorts/UVk5g...
The design process of the TrackJS redesign #coding #programming #webdesign #debugging #css
YouTube video by TrackJS
youtube.com
July 7, 2025 at 3:22 PM
trackjs.com
Jordan celebrates finally getting rid of bootstrap styles in the TrackJS redesign.

youtube.com/shorts/2vkdD...

Learn more about the TrackJS redesign 👇
trackjs.com/blog/a-fresh...
We finally got rid of Bootstrap css! #coding #programming #webdesign #debugging #css
YouTube video by TrackJS
youtube.com
June 11, 2025 at 3:15 PM
Reposted by TrackJS
requestmetrics.com
That moment when your Lighthouse score is 💯 but users are still complaining about slow pages...

Stop guessing, start measuring what they actually experience.

https://requestmetrics.com/web-performance/you-need-rum-to-understand-web-perf/
#WebDev #Performance
Why You Need Real User Monitoring to Really Understand Your Web Performance
Synthetic testing shows perfect scores, but users complain your site is slow. Real User Monitoring reveals the gap between lab performance and real-world exp...
requestmetrics.com
June 11, 2025 at 3:07 PM
trackjs.com
Eric from TrackJS talks about the most-requested feature from the redesign project: Dark Mode.

youtube.com/shorts/NT2Am...

Learn more about our redesign 👇
trackjs.com/blog/a-fresh...
#video #code #javascript #design
Building a "Dark Mode" for the UI #coding #programming #webdesign #debugging
YouTube video by TrackJS
youtube.com
June 4, 2025 at 3:07 PM
trackjs.com
Jordan Griffin discusses lowering the barrier to getting user feedback during the redesign of ⁨TrackJS⁩ .

youtube.com/shorts/e4URn...

Learn more about the TrackJS redesign 👇
trackjs.com/blog/a-fresh...
Lowering the barrier to user feedback #coding #programming #webdesign #debugging
YouTube video by TrackJS
youtube.com
May 28, 2025 at 7:04 PM
trackjs.com
We recently launched a totally redesigned UI for TrackJS. Here's our CTO Eric talking about what we learned from it.

www.youtube.com/shorts/Je8TN...
Cleaning up your old code #coding #programming #webdesign #debugging
YouTube video by TrackJS
www.youtube.com
May 22, 2025 at 7:56 PM
trackjs.com
hello world!
May 22, 2025 at 7:35 PM