Downloading blobs from Azure Blob Storage

download-from-abs.js

/***
* The ABS JS examples from Microsoft demonstrate how to download blobs as text.
* This example shows a generalized solution.
* Assumes node v12 and express framework
***/

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

const STORAGE_CONN = "your_azure_storage_connection_string";
const CONTAINER_NAME = "your_azure_container_name";

module.exports = app => {
  app.get('/rest/path/to/blob', async (req, res) => {
    const blobName = 'theNameOfYourBlob';
    const blobServiceClient = await BlobServiceClient.fromConnectionString(STORAGE_CONN);
    const containerClient = await blobServiceClient.getContainerClient(CONTAINER_NAME);
    const blockBlobClient = await containerClient.getBlockBlobClient(blobName);

    try {
      const downloadBlockBlobResponse = await blockBlobClient.download(0);
      downloadBlockBlobResponse.readableStreamBody.pipe(res);
    } catch (err) {
      res.json({payload: null, error: err});
    }
  });
}