Understanding and managing runtime errors is crucial for any application, and this blog discusses how to handle such errors in apps using libCouchbase-derived clients, which include Ruby, PHP, Python, and C/C++. These smart clients are aware of cluster topology, which allows them to provide better performance and availability by routing requests automatically to the correct Couchbase server during node failures or additions. The blog emphasizes the importance of checking error codes returned by libcouchbase clients to ensure applications can handle errors gracefully, offering insights into various error codes such as LCB_AUTH_ERROR, LCB_E2BIG, and LCB_NETWORK_ERROR, among others, and providing guidance on appropriate responses. It highlights that applications can convert error codes into strings using the function lcb_strerror(), which aids in understanding and troubleshooting errors. Overall, the blog stresses diligent error checking to maintain app functionality and prevent misinterpretations of Couchbase's performance.