React Redux Logger is an integral part of developing applications using React Redux. This tool allows developers to log the state of the application at any given time, making debugging much easier. It works by logging the previous state, the action and the next state any time an action is dispatched. In this article, we will deep dive into the application of React Redux Logger, explore solutions to common problems, and walk you through some code examples for clear understanding.
Understanding the React-Redux Logger Problem
Often developers encounter struggles while debugging their react-redux applications. Common problems include identifying the point of state mutation, tracking the flow of actions, or just visualizing the application’s state as a whole. This is where React Redux Logger comes in, providing a simple yet efficient solution for state logging.
- The logger middleware logs every dispatched action along with the state before and after the action.
- This allows developers to track changes in state and debug more effectively.
Implementing React-Redux Logger
To start with using redux logger in a React application, it needs to be added to the Redux middleware.
import { createStore, applyMiddleware } from 'redux';
import { composeWithDevTools } from 'redux-devtools-extension';
import logger from 'redux-logger';
import rootReducer from './reducers';
const store = createStore(
rootReducer,
composeWithDevTools(
applyMiddleware(logger)
)
);
Redux logger is passed as a parameter to the `applyMiddleware` function which is imported from redux. It then logs every action that gets dispatched along with the previous and next state. This store then gets passed into the Provider component from react-redux at the highest level of your application, typically App.js or index.js.
Digging deeper into Redux Logger Configurations
Redux logger comes bundled with many customizations. You can decide what gets logged.
const logger = createLogger({
collapsed: true,
diff: true
});
The `collapsed` option when set to true, will log collapsed actions, meaning that the developer needs to click to expand them and see the previous and next state. The `diff` option will show the difference between the previous and next state instead of showing the complete state.
Resolving Issues using React-Redux Logger
Understanding the benefits, the implementation, and usage of redux logger would greatly increase your productivity. It allows debugging by providing transparency into how and when state in application changes. Reading logs sequentially also gives insight into the flow of actions and state across time. The ultimate goal of using redux logger is to improve the maintainability of large applications, and it greatly achieves that.
