react-state-management

Included with Lifetime

$97 forever

Select and implement local, global, and server state patterns in React. Use when choosing or implementing state management (Context, Zustand, Redux, React Query) in React.

Web Dev

What this skill does

# React State Management

## **Priority: P0 (CRITICAL)**


## Implementation Guidelines

- **Selection**: **Zustand for small-medium apps** (minimal boilerplate, no Providers). **Redux Toolkit (RTK) for large apps** needing **time-travel debugging** or complex middleware.
- **Server Data**: **Use React Query or SWR for server state**. **Never sync server data into `useState`** manually. Let **cache source of truth**.
- **Context API**: Use for **low-frequency data** like **theme, auth, locale**, or DI. Not for high-frequency updates (causes global re-renders). **Split Context** between State and Dispatch to optimize.
- **Global Updates**: Use **Zustand, Jotai, or Redux for frequent/complex updates** across app.
- **Local**: `useState` for simple UI toggles. `useReducer` for complex state machines.
- **Derived**: Compute at render time (`const fullName = ...`). No `useEffect` to sync state.
- **URL**: Store filter/sort params in **URL Search Params** (Single Source of Truth).
- **Immutability**: Never mutate. Use spread or Immer. Use `useMemo` on context value to prevent unnecessary re-renders (primitive performance tuning belongs in `hooks` skill).

> **Boundary note**: `hooks` skill covers primitive API usage (`useMemo`, `useCallback` rules). This skill covers _architectural_ state decisions — which tool to use for which state scope.

## Reference & Examples

For Zustand, Redux Toolkit, and TanStack Query patterns:
See [references/REFERENCE.md](references/REFERENCE.md).

## Anti-Patterns

- **No Context for High-Freq**: Use Zustand/Redux for state that changes frequently.
- **No State Sync**: Compute derived values during render; avoid `useEffect` to sync state.
- **No Server Cache as UI State**: React Query/SWR for server data; don't duplicate into `useState`.

Files: 3

Size: 7.3 KB

Complexity: 26/100

Category: Web Dev

Source: https://github.com/hoangnguyen0403/agent-skills-standard/tree/main/skills/react/react-state-management

Related in Web Dev

generating-lwc-components

Included

Lightning Web Components with PICKLES methodology and 165-point scoring. Use this skill when the user creates or edits LWC components, builds wire service patterns, or writes Jest tests for LWC. TRIGGER when: user creates/edits LWC components, touches lwc/**/*.js, .html, .css, .js-meta.xml files, or asks about wire service, SLDS, or Jest LWC tests. DO NOT TRIGGER when: Apex classes (use generating-apex), Aura components, or Visualforce.

Web Devscripts

tanstack-query

Included

Manage server state in React with TanStack Query v5. Set up queries with useQuery, mutations with useMutation, configure QueryClient caching strategies, implement optimistic updates, and handle infinite scroll with useInfiniteQuery. Use when: setting up data fetching in React projects, migrating from v4 to v5, or fixing object syntax required errors, query callbacks removed issues, cacheTime renamed to gcTime, isPending vs isLoading confusion, keepPreviousData removed problems.

Web Devscripts

document-processor-api

Included

Process documents with Nutrient DWS. Use when the user wants to generate PDFs from HTML or URLs, convert Office/images/PDFs, assemble or split packets, OCR scans, extract text/tables/key-value pairs, redact PII, watermark, sign, fill forms, optimize PDFs, or produce compliance outputs like PDF/A or PDF/UA. Triggers include convert to PDF, merge these PDFs, OCR this scan, extract tables, redact PII, sign this PDF, make this PDF/A, or linearize for web delivery.

Web Devscripts

nutrient-document-processing

Included

Web Devscripts

tanstack-query

Included

Manage server state in React with TanStack Query v5. Covers useMutationState, simplified optimistic updates, throwOnError, network mode (offline/PWA), and infiniteQueryOptions. Use when setting up data fetching, fixing v4→v5 migration errors (object syntax, gcTime, isPending, keepPreviousData), or debugging SSR/hydration issues with streaming server components.

Web Devscripts

accelint-nextjs-best-practices

Included

Next.js performance optimization and best practices. Use when writing Next.js code (App Router or Pages Router); implementing Server Components, Server Actions, or API routes; optimizing RSC serialization, data fetching, or server-side rendering; reviewing Next.js code for performance issues; fixing authentication in Server Actions; or implementing Suspense boundaries, parallel data fetching, or request deduplication.

Web Devscripts