Upload a blob to Azure Storage

This article demonstrates how to upload a blob to Azure Blob Storage using various SDKs and the Azure CLI.

Tip: Azure Blob Storage is a highly scalable and cost-effective object store for storing large amounts of unstructured data.

Prerequisites

Before you begin, make sure you have the following:

An Azure subscription.
A storage account. If you don't have one, you can create one using the Azure portal or the Azure CLI.
The Azure CLI installed (optional, for CLI examples).
An Azure SDK library for your preferred language installed (e.g., Azure Blob Storage SDK for .NET, Python, Java, JavaScript).

Upload a Blob using Azure CLI

The Azure CLI provides a simple way to upload blobs.

Azure CLI Command Example

bash

az storage blob upload --account-name  --container-name  --name  --file  --auth-mode login

Replace the placeholders with your actual storage account name, container name, desired blob name, and the path to your local file.

Upload a Blob using Azure SDK for Python

Here's an example of uploading a blob using the Azure Blob Storage SDK for Python.

Python SDK Example

python

from azure.storage.blob import BlobServiceClient, BlobClient, ContainerClient

                            connect_str = ""
                            container_name = ""
                            local_file_name = ""
                            upload_file_path = "./"
                            blob_name = ""

                            # Create the BlobServiceClient object
                            blob_service_client = BlobServiceClient.from_connection_string(connect_str)

                            # Get a client to interact with a specific blob
                            blob_client = blob_service_client.get_blob_client(container=container_name, blob=blob_name)

                            print(f"Uploading to blob: {blob_name}")

                            with open(upload_file_path, "rb") as data:
                                blob_client.upload_blob(data)

                            print("Blob uploaded successfully.")

Ensure you have the azure-storage-blob package installed: pip install azure-storage-blob.

Replace the placeholders with your connection string, container name, file name, and blob name.

Upload a Blob using Azure SDK for JavaScript

This example shows how to upload a blob using the Azure Blob Storage SDK for JavaScript (Node.js).

JavaScript SDK Example

javascript

const { BlobServiceClient } = require("@azure/storage-blob");

                            const account = "";
                            const accountKey = "";
                            const containerName = "";
                            const blobName = "";
                            const filePath = "./";

                            async function uploadBlob() {
                                const blobServiceClient = new BlobServiceClient(
                                    `https://${account}.blob.core.windows.net`,
                                    new Azure.Storage.SharedKeyCredential(account, accountKey)
                                );

                                const containerClient = blobServiceClient.getContainerClient(containerName);
                                const blockBlobClient = containerClient.getBlockBlobClient(blobName);

                                console.log(`Uploading to blob: ${blobName}`);
                                await blockBlobClient.uploadFile(filePath);
                                console.log("Blob uploaded successfully.");
                            }

                            uploadBlob().catch((err) => {
                                console.error("Error uploading blob:", err);
                            });

Install the package: npm install @azure/storage-blob.

Replace placeholders with your storage account details, container name, blob name, and file path.

Types of Blobs

Azure Blob Storage supports three types of blobs:

Block blobs: Optimized for storing large amounts of unstructured data such as text or binary data. They are made up of blocks of data.
Append blobs: Optimized for append operations, such as logging data from a virtual machine.
Page blobs: Optimized for random read and write operations. Used for IaaS virtual machine disks.

The upload methods shown above are primarily for block blobs, which are the most common type.

Note: For more advanced scenarios, such as uploading large files in parallel or managing blob properties, refer to the official Azure Blob Storage documentation and SDK examples for your specific language.