Organizing a Legacy React Project Without Blocking Delivery

Rewriting everything from scratch often looks like the cleanest solution. In reality, it is usually the most expensive, slowest, and riskiest option. What consistently works in production environments is incremental refactoring driven by impact . 1. Diagnose before changing anything Before reorganizing folders or introducing patterns, identify where the real cost is. Common signals: Components with 200–500+ lines Business logic mixed with rendering useEffect handling multiple responsibilities Duplicated logic across the codebase Implicit dependencies (scattered global state) Without this mapping, refactoring becomes superficial. 2. Define a minimum standard and stop the bleed Before fixing legacy code, prevent it from growing. A simple baseline already improves consistency: Components → UI only Hooks → logic and state Services → API communication Rule: new code must follow the standard , even if old code does not. 3. Structure by feature, not by type Legacy projects often use a “by typ