(Node.js) Iterate Through ZIP Entries Using EntryAt and ZipEntry.GetNext

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This example demonstrates how to iterate through all entries in a ZIP archive using:

• Zip.EntryAt to obtain the first entry
• ZipEntry.GetNext to advance through the remaining entries

The example prints each ZIP entry's stored filename and whether the entry is a file or directory.

This approach is useful when sequentially processing ZIP entries without repeatedly calling EntryAt by index.

Suppose the ZIP archive contains:

docs/
docs/readme.txt
images/logo.png
hello.txt

The example iterates through each entry in the order stored within the ZIP archive.

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;

    var zip = new chilkat.Zip();

    // Open an existing ZIP archive.
    success = zip.OpenZip("c:/temp/example.zip");
    if (success == false) {
        console.log(zip.LastErrorText);
        return;
    }

    // A ZIP archive may contain zero entries.
    if (zip.NumEntries == 0) {

        console.log("The ZIP archive is empty.");

        zip.CloseZip();
        return;
    }

    // ------------------------------------------------------------
    // Get the first ZIP entry.
    // 
    // EntryAt(0,entry) initializes the ZipEntry object so that
    // it represents the first entry in the ZIP archive.
    // 
    var entry = new chilkat.ZipEntry();

    success = zip.EntryAt(0,entry);
    if (success == false) {
        console.log(zip.LastErrorText);
        return;
    }

    // ------------------------------------------------------------
    // Iterate through all ZIP entries.
    // 
    // GetNext updates the same ZipEntry object so that it
    // represents the next entry in the ZIP archive.
    // 
    while ((success == true)) {

        if (entry.IsDirectory == true) {

            console.log("[Directory] " + entry.FileName);

        }
        else {

            console.log("[File] " + entry.FileName);
        }

        // Advance to the next entry.
        success = entry.GetNext();
    }

    zip.CloseZip();

    console.log("Done.");

}

chilkatExample();