Render DOCX Track Changes in React: A Step-by-Step Guide (2026)

Integrating DOCX files into a React application can be challenging, especially when it comes to rendering track changes or edit suggestions. These features are essential for collaborative editing and document review processes. This tutorial will guide you through rendering DOCX files with track changes in a React application.

Key Takeaways

• Understand the structure of DOCX files and how track changes are stored.
• Learn how to use libraries like Mammoth.js to parse DOCX files with changes.
• Implement a React component to display DOCX files with track changes.
• Handle common errors and troubleshooting tips for rendering DOCX files.

Introduction

DOCX files are a staple in document management, and their ability to track changes is crucial for teams working on shared documents. When building a React application that needs to display these files, it’s important to not only show the final content but also the track changes such as insertions, deletions, and formatting suggestions. However, existing libraries like react-doc-viewer or docx-preview often fall short in rendering these changes, leading to a need for custom solutions.

In this tutorial, you’ll learn how to render track changes in DOCX files within a React application by leveraging tools that understand DOCX file structures and can translate those changes into a web-friendly format. This knowledge will empower you to create richer document editing experiences in your React applications.

Prerequisites

• Basic understanding of React and JavaScript.
• Familiarity with DOCX file format.
• Node.js and npm installed on your machine.

Step 1: Understand DOCX File Structure

The DOCX format is essentially a zip file containing XML documents. Track changes are stored within these XML files, particularly in word/document.xml and word/comments.xml. Understanding this structure is crucial for parsing and rendering these changes in a React app.

Step 2: Install Necessary Libraries

To handle DOCX files in React, we will use Mammoth.js, a library that converts DOCX documents into HTML. While Mammoth.js does not natively support track changes, we can extend its functionality.

npm install mammoth

Step 3: Parse DOCX File with Mammoth.js

Use Mammoth.js to convert the DOCX file into HTML. We will modify the output to include track changes.

import mammoth from 'mammoth';

async function convertDocxToHtml(docxArrayBuffer) {
  const options = {
    transformDocument: mammoth.transforms.paragraph((element) => {
      // Custom transformation to handle track changes
      if (element.type === 'paragraph') {
        // Check and modify the element to include track changes
      }
      return element;
    })
  };
  const result = await mammoth.convertToHtml({arrayBuffer: docxArrayBuffer}, options);
  return result.value;
}

Step 4: Create a React Component to Display the Content

Create a React component that uses the conversion function to display the DOCX contents, including the track changes.

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

function DocxViewer({ base64Docx }) {
  const [htmlContent, setHtmlContent] = useState('');

  useEffect(() => {
    const fetchDocxContent = async () => {
      const arrayBuffer = Uint8Array.from(atob(base64Docx), c => c.charCodeAt(0)).buffer;
      const html = await convertDocxToHtml(arrayBuffer);
      setHtmlContent(html);
    };
    fetchDocxContent();
  }, [base64Docx]);

  return 

Step 5: Style the Track Changes

Use CSS to style the track changes in a way that makes them clear and distinguishable from the rest of the content.

.insertion {
  background-color: #e6ffe6;
  text-decoration: underline;
}
.deletion {
  background-color: #ffe6e6;
  text-decoration: line-through;
}

Common Errors/Troubleshooting

Here are some common issues you might encounter:

• Missing Styles: Ensure styles are applied correctly to differentiate changes.
• Incorrect HTML: Verify the transformation logic in Mammoth.js to ensure it correctly interprets track changes.
• Performance Issues: Large DOCX files might slow down rendering. Consider lazy loading or pagination for large documents.

Frequently Asked Questions

Can I use other libraries besides Mammoth.js?

Yes, but Mammoth.js is highly recommended for its ease of use and flexibility. Other libraries might require more customization for track changes.

How do I handle large DOCX files?

Consider implementing lazy loading or paginating the document content to improve performance.

Why are some track changes not showing?

Ensure that your transformation logic in Mammoth.js correctly parses and includes all types of changes.

Frequently Asked Questions

Can I use other libraries besides Mammoth.js?

Yes, but Mammoth.js is highly recommended for its ease of use and flexibility. Other libraries might require more customization for track changes.

How do I handle large DOCX files?

Consider implementing lazy loading or paginating the document content to improve performance.

Why are some track changes not showing?

Ensure that your transformation logic in Mammoth.js correctly parses and includes all types of changes.