Node.js

Azure Storage: Download Blob to File

See more Azure Cloud Storage Examples

Sample code to download an Azure blob to a file. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    var rest = new chilkat.Rest();

    // Connect to the Azure Storage Blob Service
    var bTls = true;
    var port = 443;
    var bAutoReconnect = true;
    // In this example, the storage account name is "chilkat".
    success = rest.Connect("chilkat.blob.core.windows.net",port,bTls,bAutoReconnect);
    if (success !== true) {
        console.log(rest.LastErrorText);
        return;
    }

    // Provide Azure Cloud credentials for the REST call.
    var azAuth = new chilkat.AuthAzureStorage();
    azAuth.AccessKey = "AZURE_ACCESS_KEY";
    // The account name used here should match the 1st part of the domain passed in the call to Connect (above).
    azAuth.Account = "chilkat";
    azAuth.Scheme = "SharedKey";
    azAuth.Service = "Blob";
    // This causes the "x-ms-version: 2021-08-06" header to be automatically added.
    azAuth.XMsVersion = "2021-08-06";
    success = rest.SetAuthAzureStorage(azAuth);

    // Note: The application does not need to explicitly set the following
    // headers: Content-Length, x-ms-date, Authorization.  These headers
    // are automatically set by Chilkat.

    // Setup a file stream for the download
    var fileStream = new chilkat.Stream();
    fileStream.SinkFile = "C:/temp/qa_output/starfish.jpg";

    // Indicate that the call to FullRequestNoBody should send the response body
    // to fileStream if the response status code is 200.
    // If a non-success response status code is received, then nothing
    // is streamed to the output file and the error response is returned by FullRequestNoBody.
    var expectedStatus = 200;
    rest.SetResponseBodyStream(expectedStatus,true,fileStream);

    // The Azure blob container is "test", the file is "starfish.jpg"
    var responseStr = rest.FullRequestNoBody("GET","/test/starfish.jpg");
    if (rest.LastMethodSuccess !== true) {

        // Examine the request/response to see what happened.
        console.log("response status code = " + rest.ResponseStatusCode);
        console.log("response status text = " + rest.ResponseStatusText);
        console.log("response header: " + rest.ResponseHeader);
        console.log("response body (if any): " + responseStr);
        console.log("---");
        console.log("LastRequestStartLine: " + rest.LastRequestStartLine);
        console.log("LastRequestHeader: " + rest.LastRequestHeader);
        return;
    }

    console.log("Success.");

}

chilkatExample();