Codemod

Codemod is an AI-powered, community-led platform for automating code migrations, framework upgrades, and large-scale code changes. Its open-source CLI and workflow engine let developers scaffold, test, and run codemods locally or in CI, with first-class ast-grep support for fast, reliable, polyglot AST transformations. The hosted Registry lets teams publish and discover community codemods (e.g., Jest-to-Vitest, ESLint v8-to-v9), and Workflows orchestrate multi-step migrations with YAML config, matrix strategies, and manual approval gates.

It combines deterministic compiler-aware transformations with AI-powered steps, and ships Codemod MCP so AI coding assistants get AST inspection and codemod tooling natively. It is an OpenJS Foundation partner, with tooling adopted by React, Node.js, Express, React Router, Nuxt.js, pnpm, Webpack, and others. Enterprise features include Codemod Insights dashboards, Campaigns across repos, and SOC 2 Type II compliance. Caveat: AI-assisted steps still need dry-runs and review — the platform's own guidance is to prefer deterministic codemods before open-ended AI rewrites.

npx codemod or install the Codemod CLI; VS Code extension available. Publish/share via npx codemod publish.