Diagnose and fix React codebase health issues. Use when reviewing React code, fixing performance problems, auditing security, or improving code quality.

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

react-doctor