JS to TSX Converter Online Free — Convert JavaScript/JSX to TypeScript React

Free online JS to TSX converter. Convert JavaScript and JSX files to TypeScript TSX instantly. Automatic type annotations, React props typing, and interface generation.

JavaScript / JSX Code

Conversion OptionsAdd React import if missingConvert to React.FC with type annotationsAdd type annotations (useState, event handlers)Generate prop interfaces

TypeScript / TSX Output

interface CounterProps {
  // TODO: Add property types
  [key: string]: any;
}

import React from 'react';

function Counter({ initialValue = 0 }: CounterProps): React.ReactElement {
  const [count, setCount] = useState(initialValue);

  const handleClick = (e: React.MouseEvent<HTMLButtonElement>) => {
    setCount(count + 1);
  };

  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={handleClick}>Increment</button>
    </div>
  );
}

Tip: This tool provides basic type annotations. Review and adjust types according to your component needs.

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How to Use

Paste your JavaScript or JSX code into the input editor
Click "Convert to TSX" to transform the code
Review the generated TypeScript types and interfaces
Copy the converted TSX code to your project

Use Cases

Migrating React projects from JavaScript to TypeScript
Converting JSX components to typed TSX components
Adding type safety to existing React JavaScript code
Learning TypeScript by seeing how JS code translates to TS

Frequently Asked Questions

What is the difference between JSX and TSX?

JSX is JavaScript XML used in React for component templates. TSX is the TypeScript equivalent, adding static type checking to JSX, which helps catch errors at compile time.

Will the converter add proper React types?

Yes, the converter adds React.FC types for functional components, proper event handler types, and generates interfaces for component props.

Can I convert entire files?

Yes, paste your complete JS/JSX file content and the converter will process the entire file, adding type annotations throughout.