April 18, 2018

Anatomy of a JavaScript Error

It’s not a pretty sight when an application dies. Error messages can be difficult to understand, and we sometimes have to put our investigator hats on to solve the mystery and find the culprit.

Most software developers spend all their time avoiding errors, but here at Bugsnag, our entire product is built around capturing and managing errors. As such, we deal a lot with the ins and outs of JavaScript errors and their related APIs. In this blog, we’ll take a look at the different types of JavaScript errors, why they happen, and how to handle them in your application.

Automatically generated errors and why they happen

The first step to understanding JavaScript errors is to understand where they come from. Most JavaScript errors that occur in the wild are automatically generated from the JavaScript engine. There are many types of errors but they typically fall into one of 3 classes.

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