Introduction

The following post describes why and how you do error handling for fetch.

Why Care?

When you write code that does not handle errors, the code may break at runtime and when deployed to production. Getting PagerDuty calls at 3am are not fun, and are hard to debug because you’re sleepy. Doing error handling can both prevent those early morning PageDuty alerts, as well as ensure if they do occur, you have a better indication as to what went wrong, and if you need to act on it.

TypeScript can help you with types that make it more clear a piece of code can fail, and ensure you and other developers who build atop it months to years later also handle those errors. You just have to spend the time thinking about and writing the types.

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