@azure/storage-file-share

Azure Files offers fully managed file shares in the cloud that are accessible via the industry standard Server Message Block (SMB) protocol. Azure file shares can be mounted concurrently by cloud or on-premises deployments of Windows, Linux, and macOS. Additionally, Azure file shares can be cached on Windows Servers with Azure File Sync for fast access near where the data is being used.

This project provides a client library in JavaScript that makes it easy to consume Microsoft Azure File Storage service.

Use the client libraries in this package to:

Get/Set File Service Properties
Create/List/Delete File Shares
Create/List/Delete File Directories
Create/Read/List/Update/Delete Files

Note: This package was previously published under the name @azure/storage-file. It has been renamed to @azure/storage-file-share to better align with the upcoming new package for Azure Storage Files DataLake and provide a consistent set of APIs for working with files on Azure.

Key concepts

The following components and their corresponding client libraries make up the Azure Storage File Share service:

The storage account itself, represented by a ShareServiceClient
A file share within the storage account, represented by a ShareClient
An optional hierarchy of directories within the file share, represented by ShareDirectoryClient instances
A file within the file share, which may be up to 1 TiB in size, represented by a ShareFileClient

Getting started

Prerequisites: You must have an Azure subscription and a Storage Account to use this package. If you are using this package in a Node.js application, then Node.js version 8.0.0 or higher is required.

Install the package

The preferred way to install the Azure File Storage client library for JavaScript is to use the npm package manager. Type the following into a terminal window:

npm install @azure/storage-file-share

Compatibility

This library is compatible with Node.js and browsers, and validated against LTS Node.js versions (>=8.16.0) and latest versions of Chrome, Firefox and Edge.

Compatible with IE11

You need polyfills to make this library work with IE11. The easiest way is to use @babel/polyfill, or polyfill service.

You can also load separate polyfills for missed ES feature(s). This library depends on following ES features which need external polyfills loaded.

Promise
String.prototype.startsWith
String.prototype.endsWith
String.prototype.repeat
String.prototype.includes
Array.prototype.includes
Object.assign
Object.keys (Override IE11's Object.keys with ES6 polyfill forcely to enable ES6 behavior)
Symbol

Differences between Node.js and browsers

There are differences between Node.js and browsers runtime. When getting started with this library, pay attention to APIs or classes marked with "ONLY AVAILABLE IN NODE.JS RUNTIME" or "ONLY AVAILABLE IN BROWSERS".

Following features, interfaces, classes or functions are only available in Node.js

Shared Key Authorization based on account name and account key
- StorageSharedKeyCredential
Shared Access Signature(SAS) generation
- generateAccountSASQueryParameters()
- generateFileSASQueryParameters()
Parallel uploading and downloading
- ShareFileClient.uploadFile()
- ShareFileClient.uploadStream()
- ShareFileClient.downloadToBuffer()
- ShareFileClient.downloadToFile()

Following features, interfaces, classes or functions are only available in browsers

Parallel uploading and downloading
- ShareFileClient.uploadBrowserData()

JavaScript Bundle

To use this client library in the browser, you need to use a bundler. For details on how to do this, please refer to our bundling documentation.

CORS

You need to set up Cross-Origin Resource Sharing (CORS) rules for your storage account if you need to develop for browsers. Go to Azure portal and Azure Storage Explorer, find your storage account, create new CORS rules for blob/queue/file/table service(s).

For example, you can create following CORS settings for debugging. But please customize the settings carefully according to your requirements in production environment.

Allowed origins: *
Allowed verbs: DELETE,GET,HEAD,MERGE,POST,OPTIONS,PUT
Allowed headers: *
Exposed headers: *
Maximum age (seconds): 86400

Examples

Import the package

To use the clients, import the package into your file:

const AzureStorageFileShare = require("@azure/storage-file-share");

Alternative, selectively import only the types you need:

const { ShareServiceClient, StorageSharedKeyCredential } = require("@azure/storage-file-share");

Use the constructor to create a instance of ShareServiceClient. It needs to authenticate with the Azure service, so pass in a StorageSharedKeyCredential with your account and key.

const { ShareServiceClient, StorageSharedKeyCredential } = require("@azure/storage-file-share");

// Enter your storage account name and shared key
const account = "<account>";
const accountKey = "<accountkey>";

// Use StorageSharedKeyCredential with storage account and account key
// StorageSharedKeyCredential is only avaiable in Node.js runtime, not in browsers
const credential = new StorageSharedKeyCredential(account, accountKey);
const serviceClient = new ShareServiceClient(
  // When using AnonymousCredential, following url should include a valid SAS
  `https://${account}.file.core.windows.net`,
  credential
);

List shares in the account

Use ShareServiceClient.listShares() to iterator shares in this account, with the new for-await-of syntax:

const { ShareServiceClient, StorageSharedKeyCredential } = require("@azure/storage-file-share");

const account = "<account>";
const accountKey = "<accountkey>";

const credential = new StorageSharedKeyCredential(account, accountKey);
const serviceClient = new ShareServiceClient(
  `https://${account}.file.core.windows.net`,
  credential
);

async function main() {
  let shareIter = serviceClient.listShares();
  let i = 1;
  for await (const share of shareIter) {
    console.log(`Share${i}: ${share.name}`);
    i++;
  }
}

main();

Alternatively without for-await-of:

const { ShareServiceClient, StorageSharedKeyCredential } = require("@azure/storage-file-share");

const account = "<account>";
const accountKey = "<accountkey>";

const credential = new StorageSharedKeyCredential(account, accountKey);
const serviceClient = new ShareServiceClient(
  `https://${account}.file.core.windows.net`,
  credential
);

async function main() {
  let shareIter = await serviceClient.listShares();
  let i = 1;
  let shareItem = await shareIter.next();
  while (!shareItem.done) {
    console.log(`Share ${i++}: ${shareItem.value.name}`);
    shareItem = await shareIter.next();
  }
}

main();

const { ShareServiceClient, StorageSharedKeyCredential } = require("@azure/storage-file-share");

const account = "<account>";
const accountKey = "<accountkey>";

const credential = new StorageSharedKeyCredential(account, accountKey);
const serviceClient = new ShareServiceClient(
  `https://${account}.file.core.windows.net`,
  credential
);

async function main() {
  const shareName = `newshare${new Date().getTime()}`;
  const shareClient = serviceClient.getShareClient(shareName);
  await shareClient.create();
  console.log(`Create share ${shareName} successfully`);

  const directoryName = `newdirectory${new Date().getTime()}`;
  const directoryClient = shareClient.getDirectoryClient(directoryName);
  await directoryClient.create();
  console.log(`Create directory ${directoryName} successfully`);
}

main();

Create an azure file then upload to it

const { ShareServiceClient, StorageSharedKeyCredential } = require("@azure/storage-file-share");

const account = "<account>";
const accountKey = "<accountkey>";

const credential = new StorageSharedKeyCredential(account, accountKey);
const serviceClient = new ShareServiceClient(
  `https://${account}.file.core.windows.net`,
  credential
);

const shareName = "<share name>";
const directoryName = "<directory name>";

async function main() {
  const directoryClient = serviceClient.getShareClient(shareName).getDirectoryClient(directoryName);

  const content = "Hello World!";
  const fileName = "newfile" + new Date().getTime();
  const fileClient = directoryClient.getFileClient(fileName);
  await fileClient.create(content.length);
  console.log(`Create file ${fileName} successfully`);

  // Upload file range
  await fileClient.uploadRange(content, 0, content.length);
  console.log(`Upload file range "${content}" to ${fileName} successfully`);
}

main();

List files and directories under a directory

Use DirectoryClient.listFilesAndDirectories() to iterator over files and directories, with the new for-await-of syntax. The kind property can be used to identify whether a iterm is a directory or a file.

const { ShareServiceClient, StorageSharedKeyCredential } = require("@azure/storage-file-share");

const account = "<account>";
const accountKey = "<accountkey>";

const credential = new StorageSharedKeyCredential(account, accountKey);
const serviceClient = new ShareServiceClient(
  `https://${account}.file.core.windows.net`,
  credential
);

const shareName = "<share name>";
const directoryName = "<directory name>";

async function main() {
  const directoryClient = serviceClient.getShareClient(shareName).getDirectoryClient(directoryName);

  let dirIter = directoryClient.listFilesAndDirectories();
  let i = 1;
  for await (const item of dirIter) {
    if (item.kind === "directory") {
      console.log(`${i} - directory\t: ${item.name}`);
    } else {
      console.log(`${i} - file\t: ${item.name}`);
    }
    i++;
  }
}

main();

Alternatively without using for-await-of:

const { ShareServiceClient, StorageSharedKeyCredential } = require("@azure/storage-file-share");

const account = "<account>";
const accountKey = "<accountkey>";

const credential = new StorageSharedKeyCredential(account, accountKey);
const serviceClient = new ShareServiceClient(
  `https://${account}.file.core.windows.net`,
  credential
);

const shareName = "<share name>";
const directoryName = "<directory name>";

async function main() {
  const directoryClient = serviceClient.getShareClient(shareName).getDirectoryClient(directoryName);

  let dirIter = await directoryClient.listFilesAndDirectories();
  let i = 1;
  let item = await dirIter.next();
  while (!item.done) {
    if (item.value.kind === "directory") {
      console.log(`${i} - directory\t: ${item.value.name}`);
    } else {
      console.log(`${i} - file\t: ${item.value.name}`);
    }
    item = await dirIter.next();
  }
}

main();

For a complete sample on iterating please see samples/iterators-files-and-directories.ts.

Download a file and convert it to a string (Node.js)

const { ShareServiceClient, StorageSharedKeyCredential } = require("@azure/storage-file-share");

const account = "<account>";
const accountKey = "<accountkey>";

const credential = new StorageSharedKeyCredential(account, accountKey);
const serviceClient = new ShareServiceClient(
  `https://${account}.file.core.windows.net`,
  credential
);

const shareName = "<share name>";
const fileName = "<file name>";

// [Node.js only] A helper method used to read a Node.js readable stream into string
async function streamToString(readableStream) {
  return new Promise((resolve, reject) => {
    const chunks = [];
    readableStream.on("data", (data) => {
      chunks.push(data.toString());
    });
    readableStream.on("end", () => {
      resolve(chunks.join(""));
    });
    readableStream.on("error", reject);
  });
}

async function main() {
  const fileClient = serviceClient
    .getShareClient(shareName)
    .rootDirectoryClient.getFileClient(fileName);

  // Get file content from position 0 to the end
  // In Node.js, get downloaded data by accessing downloadFileResponse.readableStreamBody
  const downloadFileResponse = await fileClient.download();
  console.log(
    `Downloaded file content: ${await streamToString(downloadFileResponse.readableStreamBody)}`
  );
}

main();

Download a file and convert it to a string (Browsers)

Please refer to the JavaScript Bundle section for more information on using this library in the browser.

const { ShareServiceClient } = require("@azure/storage-file-share");

const account = "<account name>";
const sas = "<service Shared Access Signature Token>";
const shareName = "<share name>";
const fileName = "<file name>"

const serviceClient = new ShareServiceClient(
  `https://${account}.file.core.windows.net${sas}`
);

async function main() {
  const fileClient = serviceClient.getShareClient(shareName)
    .rootDirectoryClient
    .getFileClient(fileName);

    // Get file content from position 0 to the end
    // In browsers, get downloaded data by accessing downloadFileResponse.blobBody
  const downloadFileResponse = await fileClient.download(0);
  console.log(
    `Downloaded file content: ${await blobToString(
      await downloadFileResponse.blobBody
    )}`
  );
}

// [Browser only] A helper method used to convert a browser Blob into string.
async function blobToString(blob) {
  const fileReader = new FileReader();
  return new Promise((resolve, reject) => {
    fileReader.onloadend = (ev) => {
      resolve(ev.target.result);
    };
    fileReader.onerror = reject;
    fileReader.readAsText(blob);
  });
}

main()

A complete example of basic scenarios is at samples/basic.ts.

Troubleshooting

Enabling logging may help uncover useful information about failures. In order to see a log of HTTP requests and responses, set the AZURE_LOG_LEVEL environment variable to info. Alternatively, logging can be enabled at runtime by calling setLogLevel in the @azure/logger:

import { setLogLevel } from "@azure/logger";

setLogLevel("info");

Next steps

More code samples

Contributing

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.microsoft.com.

When you submit a pull request, a CLA-bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.

Azure Storage File Share client library for JavaScript