(Node.js) Compress String Feed to Base64

This example receives incoming text data in chunks, compresses as a stream, and accumulates the compressed data in base64.

Note: This example requires Chilkat v11.0.0 or greater.

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 assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var sbCompressedBase64 = new chilkat.StringBuilder();

    var compress = new chilkat.Compression();
    compress.Algorithm = "deflate";
    compress.Charset = "utf-8";
    compress.EncodingMode = "base64";

    compress.FirstChunk = true;
    compress.LastChunk = false;

    var bdCompressed = new chilkat.BinData();
    var sbUncompressedChunk = new chilkat.StringBuilder();

    var i;
    for (i = 0; i <= 24; i++) {
        if (i == 24) {
            compress.LastChunk = true;
        }

        sbUncompressedChunk.Clear();
        sbUncompressedChunk.AppendInt(i);
        sbUncompressedChunk.Append(": This is a line of data to be compressed...\r\n");

        compress.CompressSb(sbUncompressedChunk,bdCompressed);

        compress.FirstChunk = false;
    }

    console.log("The base64 encoded compressed text:");
    console.log(bdCompressed.GetEncoded("base64"));

    // Decompress in one call:
    var originalText = compress.DecompressStringENC(bdCompressed.GetEncoded("base64"));
    console.log(originalText);

}

chilkatExample();