(Node.js) S3 Get Bucket Objects with CommonPrefixes

Demonstrates how to get a list of bucket objects using the prefix and delimiter query params to get an XML result with CommonPrefixes.

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

    var http = new chilkat.Http();

    // Insert your access key here:
    http.AwsAccessKey = "AWS_ACCESS_KEY";

    // Insert your secret key here:
    http.AwsSecretKey = "AWS_SECRET_KEY";

    // In this example, my bucket is "chilkat100".
    // It contains a number of folders, one of which is named "images".
    // I want to get a list of all sub-folders under the "images" folder
    var strXml = http.S3_ListBucketObjects("chilkat100?prefix=images/&delimiter=/");
    if (http.LastMethodSuccess !== true) {
        console.log(http.LastErrorText);
        return;
    }

    console.log("Response status code = " + http.LastStatus);

    var xml = new chilkat.Xml();
    var success = xml.LoadXml(strXml);
    if (success !== true) {
        console.log(xml.LastErrorText);
        return;
    }

    // If the response status code was not 200, then the XML response is not a 
    // listing of objects, but instead contains error information.
    if (http.LastStatus !== 200) {
        console.log(xml.GetXml());
        console.log("Failed.");
        return;
    }

    // A sample response is shown below.
    console.log(xml.GetXml());
    console.log("----");

    // Here is the list of sub-folders (i.e. CommonPrefixes)

    // <?xml version="1.0" encoding="UTF-8"?>
    // <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    //     <Name>chilkat100</Name>
    //     <Prefix>images/</Prefix>
    //     <Marker/>
    //     <MaxKeys>1000</MaxKeys>
    //     <Delimiter>/</Delimiter>
    //     <IsTruncated>false</IsTruncated>
    //     <CommonPrefixes>
    //         <Prefix>images/africa/</Prefix>
    //     </CommonPrefixes>
    //     <CommonPrefixes>
    //         <Prefix>images/sea_creatures/</Prefix>
    //     </CommonPrefixes>
    // </ListBucketResult>

    var Prefix;

    // The XML can be parsed like this:
    var i = 0;
    var count_i = xml.NumChildrenHavingTag("CommonPrefixes");
    while (i < count_i) {
        xml.I = i;
        Prefix = xml.GetChildContent("CommonPrefixes[i]|Prefix");
        console.log("Prefix = " + Prefix);
        i = i+1;
    }


}

chilkatExample();