(Node.js) Decompress Gzip Data In-Place Using BinData

See more Gzip Examples

This example demonstrates how to use the UncompressBd method to decompress Gzip data stored in a BinData object.

The compressed .gz file is first loaded into memory. The UncompressBd method then decompresses the data in-place, meaning the original compressed bytes in the BinData object are replaced with the uncompressed data.

After decompression, the example writes the resulting data to a file. This approach is useful when working entirely in memory before saving or further processing the uncompressed data.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    var success = false;

    // This example demonstrates how to decompress Gzip data stored in a BinData object.
    // The decompression is done in-place, replacing the compressed data with the original data.

    var gzip = new chilkat.Gzip();
    var bd = new chilkat.BinData();

    // Load a .gz file into BinData:
    success = bd.LoadFile("example.txt.gz");
    if (success == false) {
        console.log(bd.LastErrorText);
        return;
    }

    console.log("Compressed size (bytes): " + bd.NumBytes);

    // Uncompress the data in-place:
    success = gzip.UncompressBd(bd);
    if (success == false) {
        console.log(gzip.LastErrorText);
        return;
    }

    console.log("Decompressed size (bytes): " + bd.NumBytes);

    // Save the uncompressed data to a file:
    success = bd.WriteFile("example.txt");
    if (success == false) {
        console.log(bd.LastErrorText);
        return;
    }

    console.log("File successfully uncompressed to example.txt");

}

chilkatExample();