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API Slices: Redux Integration

Internally, createApi will call the Redux Toolkit createSlice API to generate a slice reducer and corresponding action creators with the appropriate logic for caching fetched data. It also automatically generates a custom Redux middleware that manages subscription counts and cache lifetimes.

The generated slice reducer and the middleware both need to be added to your Redux store setup in configureStore in order to work correctly:

src/store.ts
import { configureStore } from '@reduxjs/toolkit'
import { setupListeners } from '@reduxjs/toolkit/query'
import { pokemonApi } from './services/pokemon'

export const store = configureStore({
  reducer: {
    // Add the generated reducer as a specific top-level slice
    [pokemonApi.reducerPath]: pokemonApi.reducer,
  },
  // Adding the api middleware enables caching, invalidation, polling,
  // and other useful features of `rtk-query`.
  middleware: (getDefaultMiddleware) =>
    getDefaultMiddleware().concat(pokemonApi.middleware),
})

// configure listeners using the provided defaults
setupListeners(store.dispatch)

reducerPath

reducerPath: string

Contains the reducerPath option provided to createApi. Use this as the root state key when adding the reducer function to the store so that the rest of the generated API logic can find the state correctly.

reducer

reducer: Reducer

A standard Redux slice reducer function containing the logic for updating the cached data. Add this to the Redux store using the reducerPath you provided as the root state key.

middleware

middleware: Middleware

A custom Redux middleware that contains logic for managing caching, invalidation, subscriptions, polling, and more. Add this to the store setup after other middleware.

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