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

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

RTK Query uses two main APIs — `createApi` and `fetchBaseQuery` — that work together to simplify data fetching, caching, and synchronization in Redux Toolkit. `createApi` is the core function used to define an API service in RTK Query. It specifies the reducer path, base query, and a set of endpoints (queries and mutations). It automatically generates hooks like `useGetPostsQuery` or `useAddPostMutation` for React components. `fetchBaseQuery` is a small wrapper around the native `fetch` API. It serves as the default base query function used inside `createApi`. It handles common tasks such as setting base URLs, headers, and parsing JSON responses. import { createApi, fetchBaseQuery } from '@reduxjs/toolkit/query/react'; export const api = createApi({ reducerPath: 'api', baseQuery: fetchBaseQuery({ baseUrl: '/api' }), endpoints: (builder) => ({ getUsers: builder.query({ query: () => 'users' }), }), }); export const { useGetUsersQuery } = api; In summary, `fetchBaseQuery` performs the network requests, while `createApi` defines how those requests integrate with Redux state and React components.

Difficulty: 4/10

createApi, fetchBaseQuery, caching

RTK Query uses two main APIs — createApi and fetchBaseQuery — that work together to simplify data fetching, caching, and synchronization in Redux Toolkit.

1. createApi

1
createApi is the core function used to define an API service in RTK Query.
2
It specifies the reducer path, base query, and a set of endpoints (queries and mutations).
3
It automatically generates hooks like useGetPostsQuery or useAddPostMutation for React components.

2. fetchBaseQuery

1
fetchBaseQuery is a small wrapper around the native fetch API.
2
It serves as the default base query function used inside createApi.
3
It handles common tasks such as setting base URLs, headers, and parsing JSON responses.

Example: Using createApi and fetchBaseQuery Together

In summary, fetchBaseQuery performs the network requests, while createApi defines how those requests integrate with Redux state and React components.

Scenario Questions

0-2 years experience

2-5 years experience

Follow-up Questions