Couchbase's Eventing Service offers a flexible solution for data transformation and integration by using JavaScript functions to respond to mutation events in document-based databases, allowing businesses to consolidate data from various sources into a uniform format. This service excels in transforming and denormalizing data, such as merging customer information from normalized databases and flat files into denormalized formats with sub-documents for billing and mailing addresses. The process involves configuring a Couchbase environment, creating necessary buckets, and deploying eventing functions that automate data transformation through JavaScript code snippets. These snippets demonstrate how to manipulate and enrich data by consolidating address information and handling schema transformations, ultimately ensuring data consistency and compatibility across different data sources. The article also provides guidance on setting up the environment, creating eventing functions, and testing the transformations, making it a valuable resource for those looking to leverage Couchbase's capabilities for efficient data management.