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codemod-gen

// Generate codemods for large-scale code changes. Use when refactoring patterns across many files.

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stars:370
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updated:February 19, 2026
SKILL.mdreadonly
SKILL.md Frontmatter
namecodemod-gen
descriptionGenerate codemods for large-scale code changes. Use when refactoring patterns across many files.

Codemod Generator

You need to replace a pattern across 500 files. Find and replace won't cut it. This tool generates AST-based codemods that safely transform your code at scale.

One command. Zero config. Just works.

Quick Start

npx ai-codemod "convert class components to functional"

What It Does

  • Generates jscodeshift codemods for your specific transformation
  • Handles complex patterns like class to function conversions
  • Preserves formatting and comments
  • Works across entire codebases

Usage Examples

# Class to functional components
npx ai-codemod "convert class components to functional"

# Modernize code
npx ai-codemod "replace lodash.get with optional chaining"

# API migrations
npx ai-codemod "migrate from moment to date-fns"

# Framework upgrades
npx ai-codemod "update React Router v5 to v6"

Best Practices

  • Test on a branch first - always run codemods on a fresh branch
  • Review the diff - spot check that transformations are correct
  • Run incrementally - do one file type at a time
  • Keep the codemod - save it for future use

When to Use This

  • Major framework or library upgrades
  • Enforcing new code patterns across the codebase
  • Deprecating old APIs in favor of new ones
  • Standardizing code style at scale

Part of the LXGIC Dev Toolkit

This is one of 110+ free developer tools built by LXGIC Studios. No paywalls, no sign-ups, no API keys on free tiers. Just tools that work.

Find more:

Requirements

No install needed. Just run with npx. Node.js 18+ recommended. Needs OPENAI_API_KEY environment variable.

npx ai-codemod --help

How It Works

Takes your plain English description of the transformation and generates a jscodeshift codemod script. The AI understands AST manipulation and outputs a codemod you can run with jscodeshift or babel.

License

MIT. Free forever. Use it however you want.

Built by LXGIC Studios