Questions

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1What is RTK Query and why was it introduced?

2How is RTK Query different from createAsyncThunk?

3What problem does RTK Query solve compared to traditional data fetching with Redux?

4What are the two main APIs in RTK Query? (createApi and fetchBaseQuery)

5How do you define an API slice using createApi()?

6What’s the purpose of reducerPath in createApi()?

7What are endpoints in RTK Query?

8What’s the difference between query and mutation endpoints in RTK Query?

9How do you use auto-generated hooks from RTK Query (e.g., useGetPostsQuery)?

10How do you refetch data manually in RTK Query?

11How do you handle caching and invalidation in RTK Query?

12What are tags and how do they help in cache invalidation?

13How can you invalidate cache for specific queries?

14How do you customize request headers or authentication tokens in RTK Query?

15How do you handle request errors or loading states?

16How can RTK Query work with GraphQL or custom fetch logic?

17How does RTK Query handle deduplication of requests?

18How can you integrate RTK Query with server-side rendering (SSR)?

19How do you perform optimistic updates in RTK Query?

20How can you manually update the cache using updateQueryData?

21How do you reset or clear RTK Query cache programmatically?

22What are best practices for structuring RTK Query API slices in large apps?

RTK

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What is RTK Query and why was it introduced?

RTK Query is a powerful data fetching and caching tool built into Redux Toolkit. It was introduced to simplify the process of managing server state — including fetching, caching, updating, and synchronizing data between a client and an API — while reducing the amount of boilerplate code typically required with Redux.

Why RTK Query Was Introduced

1
To eliminate repetitive boilerplate code for async data fetching and state management.
2
To provide built-in caching, invalidation, and automatic re-fetching of API data.
3
To improve performance by avoiding unnecessary network requests and re-renders.
4
To make integrating APIs with Redux applications faster, easier, and more consistent.

Example: Simple RTK Query Setup

RTK Query automates the complexities of API calls and state synchronization, allowing developers to focus on building features rather than managing network logic manually.