Retry logic is the rule that tells an app to automatically try a failed request again instead of giving up. In app building, it's what keeps a temporary glitch, like a dropped connection or a service that's briefly busy, from turning into a broken action for your user, which matters because most of these failures pass on their own if the app simply tries once more.
What is Retry Logic?
How retry logic works
When a request fails, retry logic re-sends it rather than stopping. Good retry logic doesn't hammer the service instantly; it usually waits a little longer between each attempt, an approach called exponential backoff, and gives up after a set number of tries so it doesn't loop forever. Retries need care, because re-sending an action that changes data can cause duplicates, which is why they're paired with an idempotency key on requests like payments.
Retry logic examples
Imagine your app sends a confirmation through an email service that's briefly overloaded, so the first request fails. With retry logic, the app waits a moment and tries again, and the second attempt goes through. Your user gets their email and never knows the first send failed, because the app quietly recovered instead of showing an error.
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