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    12.0.0-preview.6 • Public • Published

    Azure Storage client library for JavaScript - 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.

    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.

    Version: 12.0.0-preview.6

    Key concepts


    • File Storage
      • Get/Set File Service Properties
      • Create/List/Delete File Shares
      • Create/List/Delete File Directories
      • Create/Read/List/Update/Delete Files
    • Features new
      • Asynchronous I/O for all operations using the async methods
      • HttpPipeline which enables a high degree of per-request configurability
      • 1-to-1 correlation with the Storage REST API for clarity and simplicity


    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
      • SharedKeyCredential
    • 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()

    Getting started


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

    npm install @azure/storage-file-share

    In your TypeScript or JavaScript file, import via following:

    import * as AzureStorageFileShare from "@azure/storage-file-share";


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

    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.


    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 headers: *
    • Exposed headers: *
    • Maximum age (seconds): 86400


    Import types

    You can use the const Azure = require("@azure/storage-file-share"); shown above then use types and functions from Azure. Or you can selectively import certain types,

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

    Create the file service client

    Use the constructor to create a instance of ShareServiceClient, passing in the credential.

    // Enter your storage account name and shared key
    const account = "";
    const accountKey = "";
    // Use SharedKeyCredential with storage account and account key
    // SharedKeyCredential is only avaiable in Node.js runtime, not in browsers
    const sharedKeyCredential = new SharedKeyCredential(account, accountKey);
    const serviceClient = new ShareServiceClient(
      // When using AnonymousCredential, following url should include a valid SAS

    List shares in the account

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

    let shareIter1 = serviceClient.listShares();
    let i = 1;
    for await (const share of shareIter1) {
      console.log(`Share${i}: ${share.name}`);

    Alternatively without for-await-of:

    let shareIter2 = await serviceClient.listShares();
    let i = 1;
    let shareItem = await shareIter2.next();
    while (!shareItem.done) {
      console.log(`Share ${i++}: ${shareItem.value.name}`);
      shareItem = await shareIter2.next();

    Create a new share and a directory

    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`);

    Create an azure file then upload to it

    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`);

    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.

    let dirIter1 = directoryClient.listFilesAndDirectories();
    let i = 1;
    for await (const item of dirIter1) {
      if (item.kind === "directory") {
        console.log(`${i} - directory\t: ${item.name}`);
      } else {
        console.log(`${i} - file\t: ${item.name}`);

    Alternatively without using for-await-of:

    let dirIter2 = await directoryClient.listFilesAndDirectories();
    let i = 1;
    let item = await dirIter2.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 dirIter2.next();

    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)

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

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

      // Get file content from position 0 to the end
      // In browsers, get downloaded data by accessing downloadFileResponse.blobBody
      const downloadFileResponse = await fileClient.download(0);
        `Downloaded file content: ${await streamToString(
    // [Browser only] A helper method used to convert a browser Blob into string.
    export async function blobToString(blob: Blob): Promise<string> {
      const fileReader = new FileReader();
      return new Promise<string>((resolve, reject) => {
        fileReader.onloadend = (ev: any) => {
        fileReader.onerror = reject;

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


    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";

    Next steps

    More code samples


    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.


    npm i @azure/storage-file-share@12.0.0-preview.6





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