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 are endpoints in RTK Query?

In RTK Query, endpoints define the operations your application can perform with an API — such as fetching, creating, updating, or deleting data. Each endpoint describes how a specific request should be made and how RTK Query should cache or update the response.

Types of Endpoints

1
Query endpoints: Used for fetching and reading data from an API. Defined using builder.query().
2
Mutation endpoints: Used for creating, updating, or deleting data. Defined using builder.mutation().

Purpose of Endpoints

1
Define the API routes and request configurations for each operation.
2
Automatically generate React hooks like useGetUsersQuery or useAddUserMutation.
3
Control caching, invalidation, and refetching behavior for specific data sets.
4
Allow strong typing and automatic inference when using TypeScript.

Example: Defining Endpoints in createApi()

Endpoints are the core building blocks of RTK Query APIs, defining how your application interacts with backend services in a clean, declarative way.