---
name: react-doctor-f2b529172abd
description: Diagnose and fix React codebase health issues. Use when reviewing React code, fixing performance problems, auditing security, or improving code quality.
version: 1.0.0
---

# React Doctor

Scans your React codebase for security, performance, correctness, and architecture issues. Outputs a 0-100 score with actionable diagnostics.

## Usage

```bash
npx -y react-doctor@latest . --verbose
```

## Workflow

1. Run the command above at the project root
2. Read every diagnostic with file paths and line numbers
3. Fix issues starting with errors (highest severity)
4. Re-run to verify the score improved

## Rules (47+)

- **Security**: hardcoded secrets in client bundle, eval()
- **State & Effects**: derived state in useEffect, missing cleanup, useState from props, cascading setState
- **Architecture**: components inside components, giant components, inline render functions
- **Performance**: layout property animations, transition-all, large blur values
- **Correctness**: array index as key, conditional rendering bugs
- **Next.js**: missing metadata, client-side fetching for server data, async client components
- **Bundle Size**: barrel imports, full lodash, moment.js, missing code splitting
- **Server**: missing auth in server actions, blocking without after()
- **Accessibility**: missing prefers-reduced-motion
- **Dead Code**: unused files, exports, types

## Score

- **75+**: Great
- **50-74**: Needs work
- **0-49**: Critical


---
Source attribution: PostHog
Original project: https://github.com/PostHog/posthog
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Dave AI.

## Upstream license notice

MIT License

Copyright (c) 2026 Gabriel Moreira

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Dave AI resource metadata

Creator / publisher: PostHog
Original project: https://github.com/PostHog/posthog
Attribution basis: Upstream repository explicitly recorded in package mirror path

Fields of work: Development & Engineering, Product Management
Roles: Frontend Developer, Product Manager, QA / Test Engineer
Specialties: Frontend
Tools: Npx
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: bbefeecf93679998404c69d1057846465551a7c54663d8f9e84bb44d8b1b571b