Several years ago, the entire booking and check-in system for a major airline in the United States ceased to function for more than an hour during the morning rush on a weekday. This resulted in flight delays for the entire day all across the country. In the end, the cause was found to be an unhanded error that resulted in a flight lookup service to become completely unresponsive.

Handling errors in TypeScript and JavaScript is one of the fundamental things a developer should be experienced in. It’s as important as the rest of the code, and should never be overlooked or underestimated. This is a guide to help newer developers understand how to handle errors, throwing errors, and using try/catch/finally according to industry standards, and also how not to handle them.
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