This is a Node.js implementation of the Circuit Breaker pattern as popularized in Michael T. Nygard's book - Release It!. The Circuit Breaker is intended to proxy the consumption of upstream resources such that failures in the upstream resource propagate to the current system in a predictable manner. To be clear, the Circuit Breaker doesn't prevent failures; rather, it helps your application manage failures proactively, failing fast and / or providing fallback values when applicable. The Circuit Breaker proxies the consumption of upstream resources; but, it does not have intimate knowledge of the upstream resource. As such, the scope of the Circuit Breaker can be as course or as granular as you think is appropriate. For example, you can have one Circuit Breaker that represents an entire upstream resource. Or, you can create an individual Circuit Breaker for each method in an upstream resource. The more granular your Circuit Breakers, the less likely you are to get false positives.