Q329: Why is Redux Toolkit recommended over Redux? - React & Modern Frontend (445 Qs)

Redux Toolkit (RTK) is the official, opinionated way to write Redux logic today. It's built on top of plain Redux and re-exports its APIs, but wraps them with utilities that remove most of the boilerplate and footguns of hand-written Redux.

Problem with plain Redux	How Redux Toolkit fixes it
Verbose store setup (`combineReducers`, manual middleware wiring)	`configureStore()` sets up the store, `redux-thunk`, and Redux DevTools automatically
Hand-written action types/creators and switch-based reducers	`createSlice()` generates action types, action creators, and a reducer from a single object
Reducers must return new state immutably (easy to mutate by mistake)	Uses Immer internally, so you can write "mutating" logic that's safely converted to immutable updates
Async logic needs extra middleware setup (thunk/saga boilerplate)	`createAsyncThunk()` standardizes async action creators with pending/fulfilled/rejected states
Repeated normalization code for lists/entities	`createEntityAdapter()` provides prebuilt reducers/selectors for normalized state
No built-in data-fetching/caching layer	RTK Query (built on top of RTK) handles caching, refetching, and loading/error states for API calls

Example: plain Redux vs. Redux Toolkit

Plain Redux:

javascript

const INCREMENT = "counter/increment";
const increment = () => ({ type: INCREMENT });

function counterReducer(state = { value: 0 }, action) {
switch (action.type) {
  case INCREMENT:
    return { ...state, value: state.value + 1 }; // must copy manually
  default:
    return state;
}
}

Redux Toolkit:

javascript

import { createSlice, configureStore } from "@reduxjs/toolkit";

const counterSlice = createSlice({
name: "counter",
initialState: { value: 0 },
reducers: {
  increment: (state) => {
    state.value += 1; // "mutation" is safe — Immer produces new state
  },
},
});

export const { increment } = counterSlice.actions;

const store = configureStore({ reducer: { counter: counterSlice.reducer } });

In short, Redux Toolkit is recommended because it enforces best practices by default (immutability, DevTools, sensible middleware), drastically cuts boilerplate via createSlice/createAsyncThunk, and is what the official Redux docs now recommend for any new Redux code.