Whether you’re making API calls from Node.js or in the browser, connection failures are going to happen eventually. Some request errors are valid. Maybe the endpoint was wrong or the client sent the wrong data. Other times you can be sure that the error is the result of a problem with the connection to the server or one of the many hops in-between. While API and web service monitoring can inform you about the problem, a more active solution can take care of it for you.

To fix this, you can improve your HTTP request library by adding intelligent retry functionality. This kind of remediation is crucial to ensuring your API calls are successful. Some libraries, like got support retrying failed requests out of the box, while others like axios require a separate plugin. If your preferred library doesn’t support them, this article is for you. We’ll explore adding status-code-specific retries to a request, making them incrementally longer with a technique called “back-off”, and more.

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