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?
RTKRTK
Basics
Slice
Actions
Reducers
RTK Query
Store
Thunk
Scenario Based
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How do you use auto-generated hooks from RTK Query (e.g., useGetPostsQuery)?

RTK Query automatically generates React hooks for each endpoint you define using createApi(). These hooks make it easy to fetch data, handle loading states, and trigger mutations directly inside React components without writing manual async logic.

Types of Auto-Generated Hooks
  1. 1

    builder.query() ➜ generates hooks like useGetPostsQuery() for fetching data.

  2. 2

    builder.mutation() ➜ generates hooks like useAddPostMutation() for modifying data.

Common Hook Return Values
  1. 1

    data – The API response data.

  2. 2

    error – Error information if the request fails.

  3. 3

    isLoading – Indicates if the request is currently loading.

  4. 4

    isSuccess – True when data is successfully fetched.

  5. 5

    isError – True when the request fails.

Example: Using Query and Mutation Hooks

These hooks simplify API interaction in React apps by managing caching, invalidation, and state updates automatically. You simply call the hook and use its return values to render data or trigger actions.