JSX to TSX Converter — Free Online React Migration Tool

The OpenFormatter converter is a regex-based, browser-side tool. It scans the source for props.X references, collects the unique Xs into a Set, and emits an interface Props block with each name typed any. The component signature is rewritten — function Foo(props) becomes function Foo(props: Props). Imports are preserved verbatim. The result is a starter .tsx file that compiles immediately, ready for you to replace each any with a concrete type.

How to convert JSX to TSX online — 4 steps

1. Paste your JSX. Drop a React component into the Input panel.
2. Click Convert. The tool extracts props.X references and builds an interface Props skeleton.
3. Review the skeleton. Each prop is typed any with a TODO comment — replace each with the concrete type.
4. Save as .tsx. Copy the result, save with a .tsx extension, and run tsc to surface any remaining type holes.

Sample input & output

import React from 'react';

function Card(props) {
  return (
    <div onClick={props.onClick}>
      <h2>{props.title}</h2>
      <p>{props.body}</p>
    </div>
  );
}

import React from 'react';

interface Props {
  /* TODO: replace any with concrete types */
  body: any;
  onClick: any;
  title: any;
}

function Card(props: Props) {
  return (
    <div onClick={props.onClick}>
      <h2>{props.title}</h2>
      <p>{props.body}</p>
    </div>
  );
}

Common use cases

• check_circleReact component cleanup — start a typed component without writing the interface boilerplate
• check_circleCode review prep — present a typed version of a JS component for the reviewer
• check_circleMigrating JSX to TSX — bulk-convert a folder of .jsx files as the first step of a TypeScript adoption
• check_circleCodebase consistency — give a junior dev a typed scaffold to fill in instead of a blank file
• check_circleOnboarding tutorials — show the typed shape of a component example in docs
• check_circleRefactoring legacy React — extract a Props contract before reshaping internals
• check_circleGenerating typed snippets for blog posts and tutorials
• check_circleBridging plain JSX libraries into a TS codebase — produce a thin typed wrapper

JSX vs HTML, JSX vs TSX