A structured workflow for using Claude Code (Anthropic's agentic CLI tool) to safely refactor JavaScript code. The guide covers three phases: Read (map all dependencies before touching any file), Plan (generate and review a step-by-step refactoring plan), and Execute (apply changes incrementally with git commits and test runs between steps). A concrete example walks through decomposing a monolithic Express.js route handler into separate validator and route modules. Key practices include configuring a CLAUDE.md file to declare scope boundaries, using git branches for rollback safety, verifying no unintended file changes via git diff, and keeping sessions under 5 files to avoid context window issues.
Table of contents
How to Refactor Code with Claude CodeTable of ContentsWhy Refactoring with Claude Code Is DifferentThe Read-Before-Changing Pattern ExplainedSetting Up Your Refactoring SessionPhase 1: Read and Map DependenciesPhase 2: Plan the RefactoringPhase 3: Execute and VerifyThe Complete Refactoring ChecklistCommon Pitfalls and How to Avoid Them830 Impressions