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Legacy Codebase Refactorer

🟢 100% Free

Convert jQuery, ES5 callbacks, and React Class components to modern TypeScript & Hooks.

100% Client-Side Engine

Preset Mode:

Load Sample:

Legacy Input Code

import React, { useState, useEffect } from 'react';

interface UserProfileProps {
  userId?: string;
  [key: string]: any;
}

export const UserProfile: React.FC<UserProfileProps> = ({ userId }) => {
  const [user, setUser] = useState<any>(null);
  const [loading, setLoading] = useState<any>(true);

  useEffect(() => {
    // Extracted from componentDidMount
    const loadData = async () => {
      try {
        const response = await fetch(`/api/user/${userId}`);
        const result = await response.json();
        // Update state
        setUser(result);
      } catch (error) {
        console.error('Failed to load data:', error);
      }
    };
    loadData();
  }, [userId]);

  return (
    <div className="userprofile-container">
      {/* Refactored Clean JSX */}
      <h1>Profile Details</h1>
    </div>
  );
};

How to use Legacy Codebase Refactorer & Modernizer

1Select your target conversion mode from the preset buttons (e.g., React Class ➔ Hooks, jQuery ➔ Vanilla JS, or Full Auto).
2Paste your legacy JavaScript, jQuery, or React code into the left editor pane.
3The client-side engine will instantly parse the code patterns and output the modernized TypeScript version in the right pane.
4Click the 'Changes' tab to view a detailed breakdown of every structural transformation applied to your code.
5Switch to the 'Jest Unit Tests' tab to copy an auto-generated test suite customized for your newly refactored code.