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Change detection algorithms of GroupDocs.Comparison allow you to detect changes in different document parts and blocks:
- Text blocks - paragraphs, words and characters
- Tables
- Images
- Shapes etc.
GroupDocs.Comparison highlights detected changes with different colors:
- Added – blue
- Modified – green
- Style – green
- Deleted – red
You can customize the changes styling scheme using different formatting - italic, bold, underlined, strike-through, etc.
The following code snippets show how to compare two documents:
The following example compares two local documents from the file system and saves a new document that highlights all differences.
'use strict';
// Import the GroupDocs.Comparison for Node.js via Java SDK
const groupdocs = require('@groupdocs/groupdocs.comparison');
// Define paths to the source (original) and target (modified) documents
const sourcePath = 'sample-files/source.docx';
const targetPath = 'sample-files/target.docx';
// Specify the path of the result document that will contain the comparison output
const resultPath = 'result.docx';
// Create a Comparer instance for the source document
const comparer = new groupdocs.Comparer(sourcePath);
// Add the target document to be compared against the source
comparer.add(targetPath);
// Run the comparison and save the result document
comparer.compare(resultPath);
// Exit the process after the comparison is finished
process.exit(0);
This example performs the following operations:
- Instantiates the
Comparerobject with the source document path or stream. - Calls the
add()method to specify the target document path or stream. - Invokes the
compare()method to generate the result document.
The output file is as follows:
The following example loads documents from Java input streams instead of file paths and then compares them.
'use strict';
// Import the GroupDocs.Comparison for Node.js via Java SDK
const groupdocs = require('@groupdocs/groupdocs.comparison');
// Import the Java bridge so we can work with Java input streams
const java = require('java');
// Get a reference to the Java FileInputStream class
let InputStream = java.import('java.io.FileInputStream');
// Define paths to the source and target PDF documents
const sourcePdfPath = 'sample-files/source.pdf';
const targetPdfPath = 'sample-files/target.pdf';
// Define the path for the result DOCX file
const resultDocxPath = 'result.docx';
// Create a Comparer instance using a Java input stream for the source file
const comparer = new groupdocs.Comparer(new InputStream(sourcePdfPath));
// Add the target document as a Java input stream
comparer.add(new InputStream(targetPdfPath));
// Perform the comparison and save the result document
comparer.compare(resultDocxPath);
// Exit the process after the comparison is finished
process.exit(0);
In this stream-based scenario:
- The
Compareris initialized with a Java input stream for the source document. - The
add()method is used to provide the target document as an input stream. - The
compare()method runs the comparison and writes the output to the specified result file.
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