track.js

http://trackjs.com/

{Track:js} provides a complete snapshot of the application, browser, operating system, and javascript libraries that were present to the error.

{Track:js} captures your console messages in a rolling appender and includes them in the Telemetry Timeline when an error occurs. Print-line debugging in the browser. 

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Track Errors, Fix Bugs, Delight Customers.

Error timeline

Replay what happened in the network, the console, and what the user was doing right up to the error.