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Showing content from https://learn.microsoft.com/en-us/azure/storage/blobs/sas-service-create-javascript below:

Create a service SAS for a container or blob with JavaScript - Azure Storage

A shared access signature (SAS) enables you to grant limited access to containers and blobs in your storage account. When you create a SAS, you specify its constraints, including which Azure Storage resources a client is allowed to access, what permissions they have on those resources, and how long the SAS is valid.

Every SAS is signed with a key. You can sign a SAS in one of two ways:

• With a key created using Microsoft Entra credentials. A SAS that is signed with Microsoft Entra credentials is a user delegation SAS. A client that creates a user delegation SAS must be assigned an Azure RBAC role that includes the Microsoft.Storage/storageAccounts/blobServices/generateUserDelegationKey action. To learn more, see Create a user delegation SAS.
• With the storage account key. Both a service SAS and an account SAS are signed with the storage account key. The client that creates a service SAS must either have direct access to the account key or be assigned the Microsoft.Storage/storageAccounts/listkeys/action permission. To learn more, see Create a service SAS or Create an account SAS.

This article shows how to use the storage account key to create a service SAS for a container or blob with the Blob Storage client library for JavaScript.

The following code example creates a SAS for a container. If the name of an existing stored access policy is provided, that policy is associated with the SAS. If no stored access policy is provided, then the code creates an ad hoc SAS on the container.

A service SAS is signed with the account access key. Use the StorageSharedKeyCredential class to create the credential that is used to sign the SAS. Next, call the generateBlobSASQueryParameters function providing the required parameters to get the SAS token string.

// Create a service SAS for a blob container
function getContainerSasUri(containerClient, sharedKeyCredential, storedPolicyName) {
    const sasOptions = {
        containerName: containerClient.containerName,
        permissions: ContainerSASPermissions.parse("c")
    };

    if (storedPolicyName == null) {
        sasOptions.startsOn = new Date();
        sasOptions.expiresOn = new Date(new Date().valueOf() + 3600 * 1000);
    } else {
        sasOptions.identifier = storedPolicyName;
    }

    const sasToken = generateBlobSASQueryParameters(sasOptions, sharedKeyCredential).toString();
    console.log(`SAS token for blob container is: ${sasToken}`);

    return `${containerClient.url}?${sasToken}`;
}

The following code example creates a SAS on a blob. If the name of an existing stored access policy is provided, that policy is associated with the SAS. If no stored access policy is provided, then the code creates an ad hoc SAS on the blob.

To create a service SAS for a blob, call the generateBlobSASQueryParameters function providing the required parameters.

// Create a service SAS for a blob
function getBlobSasUri(containerClient, blobName, sharedKeyCredential, storedPolicyName) {
    const sasOptions = {
        containerName: containerClient.containerName,
        blobName: blobName
    };

    if (storedPolicyName == null) {
        sasOptions.startsOn = new Date();
        sasOptions.expiresOn = new Date(new Date().valueOf() + 3600 * 1000);
        sasOptions.permissions = BlobSASPermissions.parse("r");
    } else {
        sasOptions.identifier = storedPolicyName;
    }

    const sasToken = generateBlobSASQueryParameters(sasOptions, sharedKeyCredential).toString();
    console.log(`SAS token for blob is: ${sasToken}`);

    return `${containerClient.getBlockBlobClient(blobName).url}?${sasToken}`;
}

The links below provide useful resources for developers using the Azure Storage client library for JavaScript

• Azure Storage Blob client library for JavaScript
• Library source code
• Package (npm)
• API reference documentation

• Node.js
• Visual Studio Code

• Grant limited access to Azure Storage resources using shared access signatures (SAS)
• Create a service SAS

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