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The database module transfers this statefulness to modules that depend on it directly and indirectly.Ī more reusable module should be agnostic about the state of the dependency. Description The loop property sets or returns whether an audio should start playing over again when it is finished. It is important to note that the database module is stateful. Testing functionality with mocks will be difficult.

The module is aware of the connection state of the database.

We can see that the database connection is tightly coupled to the user-service module. Doing this makes the client module less reusable(tight coupling). This type of wiring means the instance of the module dependency is hard-coded to the client module. The client module imports the module dependency and instantiates it for use. The loopback device is a special, virtual network interface that your computer uses to communicate with itself. The module consuming the dependency is responsible for wiring the module.

#Loopback javascript code

Return await userService().create(req.body) įrom the code snippet above the user-service.js module consumes the database.js module. user-controller.js const userService = require( './user-service') user-service.js const dbConnection = require( './database')

Node.js module system provides an in-built system for wiring applications.Ī lot of large-scale applications in production are built on this.Īs shown in the code snippet below modules encapsulate functionality. In this article, we shall explore what it means. Incorporate model relationships and access controls for complex APIs. Access data from Oracle, MySQL, PostgreSQL, MS SQL Server, MongoDB, SOAP and other REST APIs. Some modern Node.js frameworks use dependency injection containers to wire an application. LoopBack is a highly-extensible, open-source Node.js framework that enables you to: Create dynamic end-to-end REST APIs with little or no coding.