(Node.js) Create a Zip Entirely in Memory

Demonstrates how to create a .zip from in-memory byte data and strings, and to write the .zip to an in-memory image.

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

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

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

    var crypt = new chilkat.Crypt2();
    var zip = new chilkat.Zip();

    var success = zip.NewZip("test.zip");
    if (success !== true) {
        console.log(zip.LastErrorText);
        return;
    }

    // Add the bytes 0x00 0x01 0x02 0x03 ... 0x0F as a file in the .zip

    binFileData = crypt.Decode("000102030405060708090A0B0C0D0E0F","hex");
    // entry: ZipEntry
    var entry = zip.AppendData("binaryData.dat",binFileData);

    // Add the string "Hello World!" to the .zip
    entry = zip.AppendString2("helloWorld.txt","Hello World!","utf-8");

    zipFileInMemory = zip.WriteToMemory();

    // We could save these files to a file, and it is a valid .zip
    var fac = new chilkat.FileAccess();
    success = fac.WriteEntireFile("test.zip",zipFileInMemory);
    if (success !== true) {
        console.log(fac.LastErrorText);
        return;
    }

    console.log("Zip Created!");

}

chilkatExample();