Code Converter
Modernize old React code: add TypeScript or convert classes to functions.
What it does
The Code Converter modernizes React code three ways: convert a class component to a function component with hooks, add full TypeScript types, or strip TypeScript back to clean JavaScript. Pick a mode, paste your code, and get the converted version plus a short list of what changed.
It preserves behavior while updating the syntax, which makes it handy for migrating older codebases incrementally or matching a project's conventions.
Example
You paste (mode: Class → Function)
A class component with this.state and componentDidMount.
You get
• useState replaces this.state • useEffect replaces lifecycle methods • Same behavior, modern syntax • Bullet list of every change
Use cases
- Migrating legacy class components to hooks.
- Adding TypeScript types to an untyped component.
- Producing a plain-JS version of a TypeScript snippet for a tutorial or demo.
FAQ
Which conversions are supported?
Three modes: class → function component with hooks, add TypeScript types, and TypeScript → JavaScript. Choose the mode above the input box.
Does it preserve behavior?
That's the goal — conversions keep the same runtime behavior and only change syntax. Review the change list and test before merging.
Can it handle large components?
It works best on focused components. For very large files, convert in sections for the most reliable results.