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What is a JavaScript Error? Definition and Website Analytics Impact
A JavaScript error is a browser-side runtime problem that happens when JavaScript code fails while a visitor is using a page or web app. It can break interactions, forms, checkout flows, navigation, tracking, or product features.
JavaScript errors are important in analytics because they can quietly reduce conversions without showing up as obvious traffic changes.
JavaScript error examples
Common JavaScript errors include:
- Undefined variables
- Failed imports
- Network request failures
- Browser compatibility issues
- Type errors
- Failed payment scripts
- Broken form handlers
- Third-party script failures
- Permission or security errors
Some errors affect one browser or device. Others break a page for every visitor.
Why JavaScript errors matter
A visitor may click a signup button and nothing happens. In a normal analytics dashboard, that can look like a drop-off. Error tracking can reveal the actual cause.
JavaScript errors can affect conversion rate, bounce rate, checkout completion, onboarding, and product adoption.
How to monitor JavaScript errors
Use error tracking to capture error messages, stack traces, affected pages, browsers, operating systems, and frequency. Prioritize errors that affect high-value pages or conversion flows.
Swetrix includes JavaScript error tracking alongside analytics, funnels, events, and performance data, so teams can connect technical failures to business outcomes.
Related terms: error tracking, funnel drop-off, conversion rate, and website monitoring.
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