(Node.js) Outlook --Download Attachments for a Specific Message

See more Outlook Examples

Demonstrates how to download the attachments for a particular email message.

Note: This example requires Chilkat v9.5.0.67 or greater.

Install Chilkat for Node.js and Electron using npm at

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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 http = new chilkat.Http();

    // Use your previously obtained access token here:
    // See the following examples for getting an access token:
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
    //    Refresh Access Token (Azure AD v2.0 Endpoint).
    //    Refresh Access Token (Azure AD Endpoint).

    http.AuthToken = "MICROSOFT_GRAPH_ACCESS_TOKEN";

    var sbResponse = new chilkat.StringBuilder();

    // Sends:  GET /users/{user_id | userPrincipalName}/messages/{message_id}/attachments
    // Note: It is also possible to use the literal string "me" for the current logged-on user.
    // For example: GET /me/messages/{message_id}/attachments

    http.ClearUrlVars();
    http.SetUrlVar("userPrincipalName","chilkatsoft@outlook.com");

    // Assume we already have a message ID from previously listing the messages in a folder
    var messageId = "AAMkADYzZWE3YmZmLWU0YzgtNGNkZC04MGE1LWFiYTFlNTRlY2QwYQBGAAAAAAAu7cUXL5YOTrdsUIw7-v8FBwBUcG0qWqkmQYqWLHQataQxAACnwqJUAABUcG0qWqkmQYqWLHQataQxAACnwrnOAAA=";
    http.SetUrlVar("message_id",messageId);

    // Send the request to download the attachments.
    var success = http.QuickGetSb("https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/messages/{$message_id}/attachments",sbResponse);
    if ((success !== true) && (http.LastStatus == 0)) {
        console.log(http.LastErrorText);
        return;
    }

    // The attachment data is contained within the JSON response.
    var json = new chilkat.JsonObject();
    json.LoadSb(sbResponse);
    json.EmitCompact = false;

    console.log("Status code = " + http.LastStatus);
    if (http.LastStatus !== 200) {
        console.log(json.Emit());
        console.log("Failed.");
    }

    // This is a sample JSON response.  The code for parsing and extracting/saving the attachments
    // is shown below.

    // 	{
    // 	  "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('chilkatsoft%40outlook.com')/messages('AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAA%3D%3D')/attachments",
    // 	  "value": [
    // 	    {
    // 	      "@odata.type": "#microsoft.graph.fileAttachment",
    // 	      "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAft6wtbaSJU6sgQLi98DI0Q==",
    // 	      "lastModifiedDateTime": "2017-05-10T00:30:51Z",
    // 	      "name": "fishing.pdf",
    // 	      "contentType": "application/pdf",
    // 	      "size": 295680,
    // 	      "isInline": false,
    // 	      "contentId": "F861B218BE380F44B16933097FDDACFC@namprd20.prod.outlook.com",
    // 	      "contentLocation": null,
    // 	      "contentBytes": "JVBERi0xLjMKJcfsj6 ... yZWYKMjk0MzY5CiUlRU9GCg=="
    // 	    },
    // 	    {
    // 	      "@odata.type": "#microsoft.graph.fileAttachment",
    // 	      "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAXS7qXQ-iRUCYXnhJpN8Ihg==",
    // 	      "lastModifiedDateTime": "2017-05-10T00:30:51Z",
    // 	      "name": "testCert.cer",
    // 	      "contentType": "application/octet-stream",
    // 	      "size": 1674,
    // 	      "isInline": false,
    // 	      "contentId": "5E51FA33EF0F8941ACC8260395CB1A33@namprd20.prod.outlook.com",
    // 	      "contentLocation": null,
    // 	      "contentBytes": "MIIFRjCCBC6gAwIBA ... 7pt3C5w=="
    // 	    }
    // 	  ]
    // 	}

    var sbSavePath = new chilkat.StringBuilder();
    var attachData = new chilkat.BinData();
    var lastMod = new chilkat.CkDateTime();
    var fac = new chilkat.FileAccess();

    var i = 0;
    var numMessages = json.SizeOfArray("value");
    while (i < numMessages) {
        json.I = i;

        console.log("name: " + json.StringOf("value[i].name"));
        console.log("contentType: " + json.StringOf("value[i].contentType"));
        var sizeInBytes = json.IntOf("value[i].size");
        console.log("size: " + sizeInBytes);

        // Extract the data and save to a file.
        sbSavePath.SetString("qa_output/");
        sbSavePath.Append(json.StringOf("value[i].name"));

        attachData.Clear();
        attachData.AppendEncoded(json.StringOf("value[i].contentBytes"),"base64");
        attachData.WriteFile(sbSavePath.GetAsString());

        // Get the last-modified date/time and set the output file's last-mod date/time..
        lastMod.SetFromTimestamp(json.StringOf("value[i].lastModifiedDateTime"));
        fac.SetLastModified(sbSavePath.GetAsString(),lastMod);

        console.log("----");

        i = i+1;
    }

    // The output of the above loop is:
    // 
    // 	name: fishing.pdf
    // 	contentType: application/pdf
    // 	size: 295680
    // 	----
    // 	name: testCert.cer
    // 	contentType: application/octet-stream
    // 	size: 1674
    // 	----
    // 

}

chilkatExample();