What are Middlewares in React Redux?

What are Middlewares in React Redux?

Middleware in Redux is like a gatekeeper that steps in between when an action is triggered and before it gets processed by the reducer. It gives developers the chance to do extra things with the action before it reaches the reducer, like running extra checks, doing stuff in the background, or even triggering more actions based on the initial one....

Common Use Cases of Middlewares:

Logging: Middleware is frequently leveraged to record actions and their subsequent state alterations. Developers can establish middleware functions to document details such as action type, payload, and modified state, facilitating debugging and comprehending app dynamics. Asynchronous Operations: Despite Redux’s inherently synchronous nature, middleware empowers the management of asynchronous activities, including API requests. Middleware frameworks like Redux Thunk or Redux Saga simplify the distribution of asynchronous actions, enabling developers to retrieve data from servers or trigger side effects before distributing future actions.Authentication and Authorization: Middleware can monitor actions associated with authentication and authorization processes. For instance, middleware can verify user authentication prior to specific actions.Caching: Middleware allows for the implementation of caching, where frequently accessed data is stored for faster retrieval. The middleware intercepts data retrieval actions, checks if the data is already cached, and avoids making network requests for cached data. This technique enhances performance by reducing the need for repetitive data retrieval....

Approach to implement Middleware in React Redux:

In reducers.js, we define the initial state and the reducer function for our Redux store. This reducer manages the state of a simple counter.In middleware/logger.js, we define a middleware function that logs the dispatched action and the new state.store: Represents the Redux store.next: A function that represents the next middleware in the chain. It allows the middleware to pass the action along to the next middleware or the reducer.action: The action object being dispatched.Inside the middleware function, we log the dispatched action and the current state of the Redux store. Then, we called next(action) to pass the action along to the next middleware.In store/index.js, we create the Redux store, apply the middleware, and export the configured store.In App.js, we create a simple React component that displays the counter value and provides buttons to increment and decrement the counter. We use React Redux hooks (useSelector and useDispatch) to interact with the Redux store.Now, whenever an action is dispatched, our custom middleware logs the action and the Redux store’s current state to the console. This aids in debugging and tracing action flows within the app.In index.js, we render the App component wrapped in a Provider from React Redux. This provides the Redux store to all components in the application....

Steps to Create a Middleware in React:

Step 1: To initialize the project type the below command in your terminal....

Conclusion:

In React Redux apps, middlewares act as gatekeepers for actions. They can control what happens to actions, changing or adding to how they work. With middlewares, you can log actions, handle asynchronous tasks, and add authentication and authorization rules. By using middlewares effectively, you can make your React Redux apps stronger, easier to scale, and simpler to maintain....