![]() This makes our code more modular and easier to maintain. For example, in an HTTP server, we can split the handling of a request into multiple middleware functions such as authentication middleware, request validation middleware, and response formatting middleware.Įach middleware function would have a specific responsibility, and we can easily add or remove middleware functions as per our requirements. In this pattern, we can split a single module into multiple middleware functions, each with a specific responsibility. For example, if we decide to switch to a different database provider, we can simply modify the module responsible for establishing a connection to the database, without affecting the module responsible for performing CRUD operations.Īnother way to implement SRP in Node.js is by using the middleware pattern. Similarly, the module responsible for performing CRUD operations would only have the responsibility of performing CRUD operations and would not be responsible for establishing a connection to the database.īy separating the responsibilities of the modules, we can make our code more maintainable and extensible. It would not be responsible for performing any CRUD operations. ![]() The module responsible for establishing a connection to the database would only have one responsibility, which is to establish a connection to the database. In this case, we can split the module into two separate modules, one for establishing a connection to the database and another for performing CRUD operations on the collection. Let's consider an example where we have a module that connects to a database and performs CRUD (Create, Read, Update, and Delete) operations on a collection. To implement SRP in Node.js, we must first identify the responsibilities of each module in our application. Node.js is a popular JavaScript runtime that is widely used for building scalable and efficient server-side applications. If a module has more than one responsibility, it becomes harder to maintain and extend because changes in one responsibility can affect the other responsibilities. In other words, a module should have only one responsibility or concern. The Single Responsibility Principle (SRP) states that a class or module should have only one reason to change. What is the Single Responsibility Principle?
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