使用Redux与Redux Saga管理状态时，组件单独用State存API结果是否可行？

Absolutely, using your component's own local state to handle API responses that only matter to that specific component is not just allowed—it’s often the optimal choice. Let’s break this down:

首先，明确Redux的核心定位 #

Redux was designed for shared, global state—think user authentication status, app-wide theme settings, shopping cart contents, or data that needs to be accessed across multiple components/pages. It’s not meant to be a dumping ground for every single piece of state in your app.

为什么用局部State是合理的？ #

• Less boilerplate, faster development: You skip writing unnecessary Redux actions, reducers, saga watchers, and selectors for state that never leaves the component. This cuts down on repetitive code and speeds up your workflow.
• Cleaner, more maintainable store: Cluttering your Redux store with component-specific state (like a single component’s form input values, or a one-off API response) makes it harder to debug, reason about, and scale over time.
• Better performance: Local state updates only trigger re-renders for the component itself (and its children, if any). Redux state updates, even with memoization, can lead to unnecessary re-renders across components that subscribe to the store—something you can avoid entirely with local state.

什么时候才需要用Redux/Saga？ #

You should reach for Redux and Redux Saga when:

• The API response needs to be shared with other components (e.g., user data displayed in both a header and a profile page)
• You need global middleware handling (e.g., logging all API requests, centralized error handling for network failures)
• The state needs to be persisted (e.g., saving user preferences to localStorage via Redux middleware)
• You need to coordinate complex async flows that span multiple components

实际场景示例 #

For example:

• If you’re building a modal that fetches and displays a single blog post (and no other part of the app needs that post data), using local state with useEffect and fetch (or Axios) is perfect.
• But if that blog post data needs to be referenced in a sidebar, a related posts section, or saved to a user’s reading list, then putting it in Redux makes sense.

最后：不要陷入“全Redux”误区 #

The idea of "centralized state management" doesn’t mean all state has to be centralized—it means shared state should be centralized for consistency and ease of access. Using local state for component-specific data is actually aligned with Redux’s philosophy of keeping your app’s state as lean and focused as possible.

内容的提问来源于stack exchange，提问作者mukhtar ahmed