1.0.1 • Public • Published


    A dead simple and developer friendly JavaScript library for handling object storage on Azure

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    Developer Friendly API

    For a simple blob operation, the official @azure/storage-blob SDK requires 3 "clients" for the blob service, the container and the blob itself. Blocklift.js abstracts away the complexity to provide a better developer experience.

    This is a complete example to upload a file in just a few lines:

    const Blocklift = require('blocklift')
    const lift = new Blocklift({
        account: 'accountname',
        accessKey: 'key',
        defaultContainer: 'dev' // optional
    lift.upload('hello.txt', 'Hello World')
        .then((upload) => { console.log(upload.url) })
        .catch((err) => { … })

    You can also use the async/await syntax:

    async function main () {
        const blob =  await lift.upload('hello.txt', 'Hello World')

    Easier than the official SDK

    Unfortunately the official @azure/storage-blob SDK is cumbersome to use.

    Compare the above with this official example, which has been slightly simplified for fairer comparison:

    const { DefaultAzureCredential } = require("@azure/identity");
    const { BlobServiceClient } = require("@azure/storage-blob");
    const defaultAzureCredential = new DefaultAzureCredential();
    const account = ACCOUNT_NAME;
    const blobServiceClient = new BlobServiceClient(
    const content = "Hello world!";
    const containerClient = blobServiceClient.getContainerClient('dev');
    const blockBlobClient = containerClient.getBlockBlobClient('hello.txt');
    blockBlobClient.upload(content, content.length)
        .then((response) => { … })
        .catch((err) => { … })

    Automatically get Blob URLs

    In addition to standard Blob REST API response, blocklift.js also returns a url property for you, for example:

    Set a default container

    Why repeatedly pass a container parameter or client, when you can just set a default once and then forget about it?

    const lift = new Blocklift({
        account: ACCOUNT_NAME,
        accessKey: ACCESS_KEY,
        defaultContainer: 'dev' // must already exist

    Of course, you can always choose to use a different container and pass an optional container parameter in individual operations:

    const options = { conatiner: 'not-default' }
    lift.upload('hello.txt', 'Hello World', options)

    Automatic Content-Type detection

    Blocklift.js automatically sets a Content-Type based on file contents or filename. This helps browsers identify file types and decide how to handle them. You want to show users content as quickly as possible, i.e. in browser and not have them dig through their Downloads folder.

    Content Type Browser Behavior
    none browser downloads file (default Azure SDK behavior)
    text/plain display text in browser
    image/jpg display image in browser

    Of course other file types are supported including PDFs, Microsoft Word, Powerpoint, Videos, and more. See file-type package for detailed list.


    Everything is a Promise. For a better overview, the then(), catch(), async, and await have been left out.

    For full details, see the API documentation →





    Upload a Blob or Create a File

    lift.upload('hello.txt', 'Hello World', { contentType: 'text/plain' })
    lift.uploadFile('local-file.png', 'folder/image.png')

    Delete a Blob

    lift.deleteBlob('folder/image.png', { container: 'not-default' })


    Blocklift.js uses the official SDK under the hood and will bubble up the responses.

    For example, url is added by blocklift and serverResponse is the unaltered response from the SDK.

      url: '',
      serverReponse: {
        etag: '"0x8D7CE6FCC47FC45"',
        lastModified: 2020-03-22T14:46:26.000Z,
        contentMD5: <Buffer c4 85 73 58 38 b0 05 75 7f 3f 31 99 50 0c 0e ca>,
        clientRequestId: 'd749b9a2-5fba-489d-a230-ba5df662f4f0',
        requestId: '283595f3-a01e-0009-1b58-00e0fc000000',
        version: '2019-02-02',
        date: 2020-03-22T14:46:25.000Z,
        isServerEncrypted: true,
        encryptionKeySha256: undefined,
        errorCode: undefined,
        'content-length': '0',
        server: 'Windows-Azure-Blob/1.0 Microsoft-HTTPAPI/2.0',
        'x-ms-content-crc64': 'awyymjQimGI=',
        body: undefined

    For more examples, see the API documentation →


    npm i blocklift

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    • jng