Master modern React state management with Redux Toolkit, Zustand, Jotai, and React Query. Use when setting up global state, managing server state, or choosing between state management solutions.
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Comprehensive guide to modern React state management patterns, from local component state to global stores and server state synchronization.
| Type | Description | Solutions |
|---|---|---|
| Local State | Component-specific, UI state | useState, useReducer |
| Global State | Shared across components | Redux Toolkit, Zustand, Jotai |
| Server State | Remote data, caching | React Query, SWR, RTK Query |
| URL State | Route parameters, search | React Router, nuqs |
| Form State | Input values, validation |
| React Hook Form, Formik |
Small app, simple state → Zustand or Jotai
Large app, complex state → Redux Toolkit
Heavy server interaction → React Query + light client state
Atomic/granular updates → Jotai
// store/useStore.ts
import { create } from 'zustand'
import { devtools, persist } from 'zustand/middleware'
interface AppState {
user: User | null
theme: 'light' | 'dark'
setUser: (user: User | null) => void
toggleTheme: () => void
}
export const useStore = create<AppState>()(
devtools(
persist(
(set) => ({
user: null,
theme: 'light',
setUser: (user) => set({ user }),
toggleTheme: () => set((state) => ({
theme: state.theme === 'light' ? 'dark' : 'light'
})),
}),
{ name: 'app-storage' }
)
)
)
// Usage in component
function Header() {
const { user, theme, toggleTheme } = useStore()
return (
<header className={theme}>
{user?.name}
<button onClick={toggleTheme}>Toggle Theme</button>
</header>
)
}
Detailed pattern documentation lives in references/details.md. Read that file when the navigation tier above is insufficient.
// Before (legacy Redux)
const ADD_TODO = "ADD_TODO";
const addTodo = (text) => ({ type: ADD_TODO, payload: text });
function todosReducer(state = [], action) {
switch (action.type) {
case ADD_TODO:
return [...state, { text: action.payload, completed: false }];
default:
return state;
}
}
// After (Redux Toolkit)
const todosSlice = createSlice({
name: "todos",
initialState: [],
reducers: {
addTodo: (state, action: PayloadAction<string>) => {
// Immer allows "mutations"
state.push({ text: action.payload, completed: false });
},
},
});
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).