Audit Your Codebase Easily
A lightweight, pattern-based audit tool to identify performance bottlenecks and architectural anti-patterns in React and Next.js applications.
As React and Next.js applications grow, maintaining optimal performance and adhering to architectural best practices becomes increasingly challenging. The React Best Practices Audit Tool provides an automated way to scan your codebase and catch common bottlenecks before they affect your users.
Key Takeaways
- Automatically identify 60+ React performance anti-patterns
- Eliminate data-fetching waterfalls in API routes and components
- Optimize bundle sizes by detecting barrel imports and heavy packages
- Improve RSC performance by minimizing serialization overhead
- Open-source and customizable to your project's specific needs
The audit tool acts as a companion to your development workflow, helping you maintain the same standards used by high-performance engineering teams at Vercel and beyond.
Introduction & Fundamentals
Understand the core value and rule categories of the audit tool.
What It Is
- •A lightweight, pattern-based audit tool specifically designed for modern React and Next.js apps.
- •Scans your codebase against 60+ best practices rules curated from high-performance engineering standards.
- •Identifies performance bottlenecks, architectural anti-patterns, and bundle size issues.
- •Provides prioritized findings (Critical, High, Medium, Low) with actionable advice.
Key Features
- •Waterfall Detection: Identifies sequential awaits in API routes and components that could be parallelized.
- •Bundle Optimization: Detects barrel imports, heavy package overhead, and missing dynamic imports.
- •Server Performance: Audits for missing React.cache() deduplication and oversized RSC boundaries.
- •Re-render Optimization: Finds broad dependency arrays in Hooks and missing memoization patterns.
- •Modern React Patterns: Checks for Suspense boundaries and proper use of React DOM resource hints.
Setup & Implementation
How to integrate the tool into your existing codebase.
Getting Started
- •Visit the official repository on GitHub: https://github.com/Efegnl/react-best-practices-audit
- •Download the audit.mjs script or clone the repository.
- •Copy audit.mjs into your project's scripts/ directory or the root folder.
- •Run the audit using Node.js: node scripts/audit.mjs
- •Review the findings in the console or the generated react-audit-results.txt file.
# Example command
git clone https://github.com/Efegnl/react-best-practices-audit.gitConfiguration
- •scanDirs: Define which directories to include (e.g., ['app', 'components', 'lib']).
- •extensions: Specify file types to scan (defaults to .ts, .tsx, .js, .jsx).
- •exclude: Ignore directories like node_modules, .next, or build artifacts.
- •whitelist: Skip specific files or patterns that have intentional exceptions.
Rule Categories
- •Eliminating Waterfalls: Sequential data fetching and independent awaits.
- •Bundle Size Optimization: Imports management and conditional loading.
- •Server-Side Performance: RSC serialization, caching, and streaming.
- •Client-Side Data Fetching: SWR integration and effect consolidation.
- •Re-render Optimization: Dependency management and state locality.
- •JavaScript Performance: General JS best practices and pattern matching.
Deep Dive & Output
Understanding the mechanics and results.
How It Works
- •Pattern Matching: Uses optimized regex and string analysis for fast codebase scanning.
- •Contextual Analysis: Distinguishes between Client and Server components to apply relevant rules.
- •Import Resolution: Tracks dependency chains (like barrel imports) to identify potential bloat.
- •Non-Instructional: Runs entirely as a standalone script without requiring project changes or dependencies.
Interpreting Output
- •Summary Table: Shows total issues found categorized by priority (Critical to Low).
- •Detailed Results: Lists specific file paths, line numbers, and the reason for each finding.
- •Actionable Feedback: Every rule includes a description of why it triggered and how to fix it.
- •Incremental Improvements: Use the audit as a baseline and fix issues starting from Critical priority.
Try it on GitHub
The React Best Practices Audit script is fully open-source. You can download it, contribute new rules, or use it to ensure your projects adhere to the highest performance standards.
Final Thoughts
Continuous auditing is key to maintaining a healthy React codebase. By integrating this tool into your development process, you can catch performance regressions early and keep your applications fast and responsive.