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311 changes: 310 additions & 1 deletion src/content/docs/azure/services/table-storage.mdx
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---
title: "Table Storage"
description: API coverage for Microsoft.TableStorage in LocalStack for Azure.
description: Get started with Azure Table Storage in LocalStack
template: doc
---

import AzureFeatureCoverage from "../../../../components/feature-coverage/AzureFeatureCoverage";

## Introduction

Azure Table Storage is a NoSQL key-value store designed for large volumes of semi-structured data, useful for lightweight metadata, lookup records, and simple operational datasets.
Data is organized into tables, partitions, and entities addressed by PartitionKey and RowKey.
It offers schemaless flexibility at a fraction of the cost of traditional SQL, making it easy to adapt as your application evolves. For more information, see [What is Azure Table storage?](https://learn.microsoft.com/en-us/azure/storage/tables/table-storage-overview)

LocalStack for Azure provides a local environment for building and testing applications that make use of Azure Table Storage.
The supported APIs are available on our [API Coverage section](#api-coverage), which provides information on the extent of Table Storage's integration with LocalStack.

## Getting started

This guide is designed for users new to Table Storage and assumes basic knowledge of the Azure CLI and our `azlocal` wrapper script.

Start your LocalStack container using your preferred method. For more information, see [Introduction to LocalStack for Azure](/azure/getting-started/).

:::note
As an alternative to using the `azlocal` CLI, users can run:

`az start-interception`

This command points the `az` CLI away from the public Azure management REST API and toward the LocalStack for Azure emulator API.
To revert this configuration, run:

`azlocal stop-interception`

This reconfigures the `az` CLI to send commands to the official Azure management REST API. At this time, there is no full parity between `azlocal` and `az` commands after running `az start-interception`. Therefore, this technique is not fully interchangeable.
:::

### Create a resource group

Create a resource group to contain your storage resources:

```bash
azlocal group create \
--name rg-table-demo \
--location westeurope
```

```bash title="Output"
{
"id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/rg-table-demo",
"location": "westeurope",
"managedBy": null,
"name": "rg-table-demo",
"properties": {
"provisioningState": "Succeeded"
},
"tags": null,
"type": "Microsoft.Resources/resourceGroups"
}
```

### Create a storage account

Create a storage account in the resource group:

```bash
azlocal storage account create \
--name sttabledemols \
--resource-group rg-table-demo \
--location westeurope \
--sku Standard_LRS
```

```bash title="Output"
{
...
"id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/rg-table-demo/providers/Microsoft.Storage/storageAccounts/sttabledemols",
...
"name": "sttabledemols",
...
"placement": null,
"primaryEndpoints": {
"blob": "https://sttabledemolsblob.localhost.localstack.cloud:4566",
...
"table": "https://sttabledemolstable.localhost.localstack.cloud:4566",
...
},
....
}
```

### Authentication

There are three ways to authenticate storage table commands against the emulator:

#### Storage account key

Retrieve the account key and pass it with `--account-name` and `--account-key`:

```bash
ACCOUNT_KEY=$(azlocal storage account keys list \
--account-name sttabledemols \
--resource-group rg-table-demo \
--query "[0].value" \
--output tsv)

azlocal storage table list \
--account-name sttabledemols \
--account-key "$ACCOUNT_KEY"
```

#### Login credentials

Use `--auth-mode login` to authenticate with the current session credentials:

```bash
azlocal storage table list \
--account-name sttabledemols \
--auth-mode login
```

#### Connection string

Bundle the account name and key into a single value:

```bash
CONNECTION_STRING=$(azlocal storage account show-connection-string \
--name sttabledemols \
--resource-group rg-table-demo \
--query connectionString -o tsv)

azlocal storage table list \
--connection-string "$CONNECTION_STRING"
```

The remaining examples in this guide use connection strings for brevity.

### Create and inspect a table

Create a table:

```bash
azlocal storage table create \
--name apptable \
--connection-string "$CONNECTION_STRING"
```

```bash title="Output"
{
"created": true
}
```

Verify the table exists:

```bash
azlocal storage table exists \
--name apptable \
--connection-string "$CONNECTION_STRING"
```

```bash title="Output"
{
"exists": true
}
```

List tables in the storage account:

```bash
azlocal storage table list \
--connection-string "$CONNECTION_STRING"
```

```bash title="Output"
[
{
"name": "apptable"
}
]
```

### Insert and query entities

Insert an entity into the table:

```bash
azlocal storage entity insert \
--table-name apptable \
--entity PartitionKey=demo RowKey=1 name=Alice score=100 \
--connection-string "$CONNECTION_STRING"
```

```bash title="Output"
{
"content": {
"PartitionKey": "demo",
"RowKey": "1",
"name": "Alice",
"score": 100,
...
},
"etag": "W/\"datetime'...'\"",
...
}
```

Retrieve the entity by its partition key and row key:

```bash
azlocal storage entity show \
--table-name apptable \
--partition-key demo \
--row-key 1 \
--connection-string "$CONNECTION_STRING"
```

```bash title="Output"
{
"PartitionKey": "demo",
"RowKey": "1",
"name": "Alice",
"score": 100,
...
}
```

Query entities by partition key:

```bash
azlocal storage entity query \
--table-name apptable \
--filter "PartitionKey eq 'demo'" \
--connection-string "$CONNECTION_STRING"
```

```bash title="Output"
{
"items": [
{
"PartitionKey": "demo",
"RowKey": "1",
"name": "Alice",
"score": 100,
...
}
],
"nextMarker": {}
}
```

### Update, merge, and delete entities

Update the entity with a merge operation:

```bash
azlocal storage entity merge \
--table-name apptable \
--entity PartitionKey=demo RowKey=1 score=101 \
--connection-string "$CONNECTION_STRING"
```

```bash title="Output"
{
"etag": "W/\"datetime'...'\"",
...
}
```

Delete the entity and verify the table is empty:

```bash
azlocal storage entity delete \
--table-name apptable \
--partition-key demo \
--row-key 1 \
--connection-string "$CONNECTION_STRING"

azlocal storage entity query \
--table-name apptable \
--connection-string "$CONNECTION_STRING"
```

```bash title="Output"
{
"deleted": null
}
{
"items": [],
"nextMarker": {}
}
```

## Features

The Table Storage emulator supports the following features:

- **Data plane REST API**: Table CRUD, entity operations (insert, query, merge, replace, delete), OData query filters, and batch/transaction requests.
- **Control plane REST API**: Create and get tables, get and set table service properties via Azure Resource Manager.
- **Multiple authentication modes**: Storage account key, login credentials, and connection strings.
- **Entity operations**: Insert, query, show, merge, replace, and delete entities with schemaless, key-value data addressed by `PartitionKey` and `RowKey`.
- **OData query support**: Filter and project entities using OData expressions (e.g., `PartitionKey eq 'demo'`).
- **Batch operations**: Entity batch (transaction) requests are proxied with correct URL and authorization rewriting.

## Limitations

- **No data persistence across restarts**: Table data is not persisted and is lost when the LocalStack emulator is stopped or restarted.
- **Table service properties**: `set_service_properties` is a no-op and `get_service_properties` returns empty defaults, unlike Azure where CORS, logging, and metrics settings are persisted and applied.
- **Storage account keys**: Keys are emulator-generated rather than managed by Azure.
- **Header validation**: Unsupported request headers or parameters are silently accepted (Azurite runs in loose mode) instead of being rejected.
- **API version enforcement**: The emulator does not validate the `x-ms-version` header; all API versions are accepted.

## Samples

The following sample demonstrates how to use Table Storage with LocalStack for Azure:

- [Azure Functions Sample with LocalStack for Azure](https://github.com/localstack/localstack-azure-samples/tree/main/samples/function-app-storage-http/dotnet)

## API Coverage

<AzureFeatureCoverage service="Microsoft.TableStorage" client:load />