(Node.js) Unzip an AES Encrypted Text File directly into a String Variable

A common need is to unzip from an AES encrypted Zip archive directly into a string variable, such that the unencrypted file never resides on disk, even temporarily. This example shows how to do it.

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 zip = new chilkat.Zip();

    // This example opens a WinZip-compatible AES encrypted
    // .zip that contains a single file: hamlet.xml.

    // It decrypts and unzips hamlet.xml directly into a string
    // variable.
    zip.SetPassword("secret");
    var success = zip.OpenZip("qa_data/hamlet.zip");
    if (success !== true) {
        console.log(zip.LastErrorText);
        return;
    }

    // entry: ZipEntry
    var entry = zip.GetEntryByName("hamlet.xml");
    if (zip.LastMethodSuccess == false) {
        console.log("Failed to find entry in zip");
        return;
    }

    // lineEndingBehavior:
    // 0 = leave unchanged.
    // 1 = convert all to bare LF's
    // 2 = convert all to CRLF's
    var lineEndingBehavior = 0;
    var srcCharset = "utf-8";
    var xmlText = entry.UnzipToString(lineEndingBehavior,srcCharset);
    console.log(xmlText);


}

chilkatExample();