Form submit fails
A runtime error prevents lead, demo, account, or checkout forms from completing.
Guide
How to Monitor JavaScript Errors on a Website
JavaScript errors can break a website without creating downtime. A page may load successfully, but the checkout button, signup form, navigation, or entire app screen may stop working.
Why JavaScript error monitoring matters
Modern websites rely on JavaScript for rendering, state, forms, product data, checkout steps, analytics, personalization, and application behavior. When that JavaScript fails, the page may still respond while the user experience breaks.
Basic uptime monitoring often misses these failures because it checks whether the server responded. JavaScript error monitoring looks at what happens inside the browser after the page starts loading.
How to monitor JavaScript errors
Start with the pages where JavaScript failures would hurt most: signup, login, checkout, pricing, product pages, landing pages, dashboards, and forms.
Use a browser-based check that records runtime errors and meaningful console.error messages. Pair that with broken-resource detection because missing scripts and failed bundles are common reasons front-end behavior breaks.
For the most important flows, add user journey monitoring. That helps confirm whether a JavaScript error actually blocks the next customer action.
JavaScript errors that affect business outcomes
Not every console message deserves an alert. Prioritize errors that affect important pages and actions.
Blank app screen
The application shell crashes and users see an empty page instead of the interface.
Broken CTA behavior
The button is visible, but the click handler no longer routes visitors to the next step.
Missing product or pricing data
A front-end error stops API data from rendering on a revenue-critical page.
Best practices for JavaScript error monitoring
Make JavaScript visibility actionable rather than noisy.
- Monitor JavaScript errors on pages tied to revenue, leads, and account access
- Capture meaningful console.error messages alongside runtime errors
- Pair error monitoring with broken-resource and API call tracking
- Use user journeys to verify whether an error breaks a real action
- Review errors after deployments, CMS edits, and third-party script changes
- Avoid alerting on every low-impact message if it does not affect a critical page
Conclusion
JavaScript errors are a major reason websites break while still appearing online. Monitoring them helps teams find the browser-side failures customers actually experience.
NorthDuty includes JavaScript error and console.error visibility in its website health checks, then connects that signal to uptime, API calls, UI changes, and user journey monitoring.
Related NorthDuty Pages
Keep exploring the feature pages and commercial routes connected to this topic.
Feature
Uptime Monitoring
Monitor uptime every 5 minutes with HTTP, SSL, DNS, blank-page detection, broken resources, JavaScript errors, and API call tracking.
Explore Uptime MonitoringFeature
User Journey Monitoring
NorthDuty AI suggests 5 website journeys. Enable them in one click or describe a custom multi-step flow in plain text.
Explore User Journey MonitoringArticle
What Causes Blank Pages on Websites?
Learn what causes blank pages on websites and how website health monitoring can detect blank screens even when the server returns 200 OK.
Read What Causes Blank Pages on Websites?Pricing
Pricing
Explore NorthDuty pricing for website monitoring covering uptime checks, UI change detection, and user journey monitoring.
Compare pricing plansFrequently Asked Questions
Short answers that summarize the practical takeaways from this guide.
Can JavaScript errors break a website without downtime?
Yes. The server can respond successfully while a front-end error breaks rendering, forms, buttons, or customer journeys.
Which JavaScript errors should I monitor first?
Prioritize errors on signup, login, checkout, forms, pricing, product pages, dashboards, and other business-critical routes.
How does NorthDuty monitor JavaScript errors?
NorthDuty captures runtime errors and meaningful console.error messages from a browser context as part of its website health monitoring checks.
Call To Action
Start monitoring your website with NorthDuty today.
Use NorthDuty to monitor JavaScript errors on your most important pages and connect front-end failures to page health, API calls, and user journeys.