Azure Storage Blob client library samples for JavaScript

These sample programs show how to use the JavaScript client libraries for Azure Storage Blobs Change Feed in some common scenarios.

File Name Description
basic.js iterate through the Change Feed between a start and end date
resume.js resuming a previous iteration of a Change Feed using the continuation token


The sample are compatible with Node.js >= 8.0.0, except for the samples that use the async for await syntax, which require Node.js >= 10.0.0.

You need an Azure subscription and an Azure Storage account to run these sample programs. Samples retrieve credentials to access the storage account from environment variables. Alternatively, edit the source code to include the appropriate credentials. See each individual sample for details on which environment variables/credentials it requires to function.


To run the samples using the published version of the package:

  1. Install the dependencies using npm:
npm install
  1. Edit the file sample.env, adding the correct credentials to access the Azure service and run the samples. Then rename the file from sample.env to just .env. The sample programs will read this file automatically.

  2. Run whichever samples you like:

node basic.js

Alternatively, run a single sample with the correct environment variables set (step 3 is not required if you do this), for example (cross-platform):

npx cross-env ACCOUNT_NAME="<account name>" ACCOUNT_KEY="<account key>" node basic.js

Next Steps

Take a look at our API Documentation for more information about the APIs that are available in the clients.