How JavaScript errors impact ecommerce revenue (and how to fix them fast)
Megan Glover
June 22, 2025
Blogs
TL;DR – Why this matters
JavaScript errors on ecommerce websites often go undetected—but they can break product pages, crash carts, and disrupt checkout flows. These silent failures create poor user experiences, reduce conversion rates, and directly impact revenue. In fact, over 94% of ecommerce websites have 5 or more unresolved JS errors live right now. This guide explains how JavaScript errors affect your ecommerce performance, why visibility matters, and how tools like Noibu help detect, prioritize, and fix these issues—cutting error resolution time by 70% and protecting your revenue.
Frustrated shoppers: Errors like Cannot read properties of undefined or AJAX failures lead to confusion and abandonment.
Revenue loss:8% of shoppers abandon more than 10 purchases per year due to slow or broken websites.
Brand damage: A single unresolved bug in your checkout flow can erode trust instantly.
⭐ Customer experience impacts the bottom line
61% of customers say they share bad experiences with others
61% have stopped buying from a company due to a better competitor experience
70% say they share good experiences with others
Every experience—good or bad—ripples through your revenue.
Source: Salesforce Research – State of the Connected Customer, 2nd Edition
Common JavaScript errors that hurt ecommerce websites
Here are real-world frontend errors that silently impact ecommerce UX and conversions.
🔹 Fetch Errors
Occur when fetch() fails to retrieve data due to network latency or server issues. Impact: Product listings, cart data, or dynamic content fail to load — resulting in blank pages or broken flows.
🔹 Magento-Specific: Cannot read properties of undefined (reading 'remove')
Seen during upgrades from Magento 2.3.6 to 2.4.x, often due to inconsistent local storage initialization. Impact: Breaks login, cart icons, or UI components after reload.
🔹 AJAX Call Failures
Triggered when async requests are canceled due to page reloads, redirects, or browser interference. Impact: Product search, filters, or checkout flows fail silently — causing drop-offs.
🔹 Illegal Invocation Errors
Occur when functions (like window.alert.call()) are executed in the wrong context. Impact: Breaks checkout or analytics — often without visible warning to the user.
🔹 Reference and Typo Errors
Simple bugs like using toUperCase() instead of toUpperCase() cause runtime crashes. Impact: Breaks add-to-cart buttons, shipping calculators, and custom UI elements.
Why ecommerce teams struggle to detect JavaScript errors
Frontend errors don’t show up in server logs — so traditional monitoring misses them.
Only ~10% of users report bugs — the rest silently leave your site.
Noibu helps you detect and resolve JavaScript errors before they impact revenue.
Real-time error detection: Catch syntax, runtime, GraphQL, image, and AJAX errors as soon as they happen—before your customers do.
Revenue-based prioritization: Noibu ranks errors by how much they impact conversion and sales, so your dev team can focus on what matters most.
Developer-ready diagnostics: Instantly access stack traces, browser info, device type, session date, and more—no more guestting or reproducing.
Who’s winning with Noibu?
"In terms of development experience, I would go as far as to say the tool is invaluable. It's just an awesome tool to pinpoint what's going on.” — Daniel Goodwin, Frontend Developer, Ruroc
“The developers are happier because, ultimately, they are doing what they like doing, which is the development side of things and not necessarily the replication of bugs.” — Fiona Brown, Head of Ecommerce, Joe Browns
Join the world’s fastest-growing ecommerce brands improving conversion rates with Noibu’s error monitoring platform.
Frequently asked questions
Quick answers to top questions ecommerce leaders are asking in 2025.
What are JavaScript errors in ecommerce websites?
JavaScript errors are bugs in your frontend code that can break functionality like product views, cart actions, or checkout flows—leading to lost conversions and a degraded user experience.
Why are frontend errors hard to detect?
Most frontend JavaScript errors don’t trigger server-side alerts or logs. They happen in the browser, are invisible to backend monitoring, and rarely get reported by users—making them easy to miss.
How do JavaScript errors affect ecommerce revenue?
These errors can break mission-critical flows—like checkout, search, or add-to-cart—leading to higher bounce rates and cart abandonment. Many brands unknowingly lose 5–10% of revenue this way.
How does Noibu help fix these errors?
Noibu monitors your ecommerce frontend in real time, flags JavaScript and network errors, and prioritizes them based on revenue impact. Your developers get full technical context to resolve them fast—cutting resolution time by up to 70%.
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