📘 virtual-react-json-diff

A high-performance React component for visually comparing large JSON objects. Built on top of json-diff-kit, this viewer supports:

🧠 Virtual scrolling for better performance (especially for large diffs)
🔍 Search functionality
🗺️ Mini Map
🎨 Custom theming
⚛️ Optimized for React (uses react-window)

This component is developed for dealing with thousands of lines of Json Files, and seamlessly compare then render them on UI

🚀 Features

Compare Large JSON Objects – Handles big files without freezing the UI
Virtualized Rendering – Efficient DOM updates using react-window
Search Highlighting – Find matches and scroll directly to them
Mini Map – A minimap of Json Diff, scaled to better see comparison result
Customizable Styles – Add your own class names and styles easily (checkout JsonDiffCustomTheme.css)

Demo

To see how it works, demo available here: https://virtual-react-json-diff.netlify.app

📦 Installation

npm install virtual-react-json-diff
# or
yarn add virtual-react-json-diff

Example Screenshot

The theme is fully customizable, all colors can be changed. (And soon new themes will be available)

Usage

To change Diff methods please see DifferOptions. By default virtual-react-json-diff uses following configuration

new Differ({
  detectCircular: true,
  maxDepth: 20,
  showModifications: true,
  arrayDiffMethod: "lcs",
  preserveKeyOrder: "before",
  ...differOptions,
}),

Simply pass your json objects into Viewer Component. It will find differences and show.

import React from "react";
import { VirtualDiffViewer } from "virtual-react-json-diff";

const oldData = { name: "Alice", age: 25 };
const newData = { name: "Alice", age: 26, city: "NYC" };

export default function App() {
  return (
    <VirtualDiffViewer
      oldValue={oldData}
      newValue={newData}
      height={600}
      className="my-custom-diff"
    />
  );
}

The component exposes a root container with the class:

<div class="diff-viewer-container">...</div>

You can pass your own class name via the className prop to apply custom themes.

🙌 Acknowledgements

Built on top of the awesome json-diff-kit.

📄 License

Pull requests, suggestions, and issues are welcome! Check out the issues or open a PR.