🔄 Legacy in. Modern out.
Migrate jQuery to React, callbacks to async/await, Python 2 to 3, JS to TypeScript — with every key change explained and gotchas flagged.
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AI-generated — always review before shipping to production. Your input is sent to the AI service only to generate the answer. The 85 classic utilities on this site run 100% in your browser.
How it works
- Paste the legacy code: Drop in the code that needs modernizing — outdated syntax, deprecated patterns, or framework-specific legacy.
- Choose the migration: Select the target migration, such as moving to a newer language version or framework.
- Get modern code: The instrument rewrites the code using current idioms and APIs while preserving its behavior.
Good to know
- Refactored code must be validated by your tests — automated rewrites can subtly change behavior at the edges.
- Migrate incrementally: refactor one module at a time instead of entire codebases in a single pass.