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A service can be any business logic that completes an action and provides a specified result to the end point user. And the backend application database query should be inside the service section by leveraging data access layer. Here all the business logic to access data are combined inside a service. So the controller invokes that service and service leverage data access layer to connect with database and calculation. Read more on Service Oriented Architecture in NodeJS

 from Lines of Business (LoBs), this can provide much-needed breathing space. Unfortunately, in many instances, it is also setting off the alarm bells. These citizen integrators are creating jerry-rigged solutions over which IT has no visibility and control, creating a minefield of future problems. It is in the interest of IT and the enterprise to find ways to automate the integration and empower citizen integrators —but with a healthy degree of oversight.