How to Track Frontend Errors Manually
How to catch unhandled application runtime errors and forward debug metrics to logging endpoints.
Listen to Unhandled Global Exceptions
Attach an event listener to the global window object tracking runtime errors: 'window.addEventListener("error", callback)'.
Capture Unhandled Promise Rejections
Attach an event listener tracking unhandled asynchronous errors: 'window.addEventListener("unhandledrejection", callback)'.
Extract Critical Telemetry Metrics
Inside error tracking callbacks, extract key debugging data from the error object: the message string, file URL source line, column metrics, and stack traces.
Gather Client Runtime Metadata
Collect essential environment details like the browser user agent string, current route URL location, and timestamp metrics.
Construct the Payload Payload Object
Package the telemetry data and runtime metadata into a structured JSON log object ready for transport.
Transmit Logs via Beacon APIs
Send the error data packet to your logging server using 'navigator.sendBeacon(url, data)'. This API reliably sends telemetry data even if the page is being closed or unloaded.
Implement a React Error Boundary Component
Create a class component that implements the 'componentDidCatch' lifecycle method to catch rendering errors within the React component tree and prevent app crashes.
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