# Azure ComputeManagement REST client library for JavaScript

Compute Management Rest Client

**If you are not familiar with our REST client, please spend 5 minutes to take a look at our [REST client docs](https://github.com/Azure/azure-sdk-for-js/blob/main/documentation/rest-clients.md) to use this library, the REST client provides a light-weighted & developer friendly way to call azure rest api**

Key links:

- [Source code](https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/compute/arm-compute-rest)
- [Package (NPM)](https://www.npmjs.com/package/@azure-rest/arm-compute)
- [API reference documentation](https://learn.microsoft.com/javascript/api/@azure-rest/arm-compute?view=azure-node-preview)
- [Samples](https://github.com/Azure-Samples/azure-samples-js-management)

## Getting started

### Currently supported environments

- [LTS versions of Node.js](https://github.com/nodejs/release#release-schedule)

### Prerequisites

- You must have an [Azure subscription](https://azure.microsoft.com/free/) to use this package.

### Install the `@azure-rest/arm-compute` package

Install the Azure ComputeManagement client REST client library for JavaScript with `npm`:

```bash
npm install @azure-rest/arm-compute
```

### Create and authenticate a `ComputeManagementClient`

To use an [Azure Active Directory (AAD) token credential](https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/identity/identity/samples/AzureIdentityExamples.md#authenticating-with-a-pre-fetched-access-token),
provide an instance of the desired credential type obtained from the
[@azure/identity](https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/identity/identity#credentials) library.

To authenticate with AAD, you must first `npm` install [`@azure/identity`](https://www.npmjs.com/package/@azure/identity)

After setup, you can choose which type of [credential](https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/identity/identity#credentials) from `@azure/identity` to use.
As an example, [DefaultAzureCredential](https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/identity/identity#defaultazurecredential)
can be used to authenticate the client.

Set the values of the client ID, tenant ID, and client secret of the AAD application as environment variables:
AZURE_CLIENT_ID, AZURE_TENANT_ID, AZURE_CLIENT_SECRET

Use the returned token credential to authenticate the client:

```ts snippet:ReadmeSampleCreateClient
import { DefaultAzureCredential } from "@azure/identity";
import ComputeManagementClient from "@azure-rest/arm-compute";

const credential = new DefaultAzureCredential();
const client = ComputeManagementClient(credential);
```

## Examples

The following section shows you how to initialize and authenticate your client, then list all of your Virtual Machines within a resource group.

### List all virtual machines within a resource group

```ts snippet:ReadmeSampleVirtualMachinesList
import { DefaultAzureCredential } from "@azure/identity";
import ComputeManagementClient, { paginate } from "@azure-rest/arm-compute";

const credential = new DefaultAzureCredential();
const client = ComputeManagementClient(credential);

const subscriptionId = "";
const resourceGroupName = "rgcompute";
const options = {
  queryParameters: {
    $filter: "aaaaaaaaaaaaaaaaaaaaaaa",
    "api-version": "2022-08-01",
  },
};
const initialResponse = await client
  .path(
    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachines",
    subscriptionId,
    resourceGroupName,
  )
  .get(options);

const pageData = paginate(client, initialResponse);
for await (const item of pageData) {
  console.log(item);
}
```

## Troubleshooting

### Logging

Enabling logging may help uncover useful information about failures. In order to see a log of HTTP requests and responses, set the `AZURE_LOG_LEVEL` environment variable to `info`. Alternatively, logging can be enabled at runtime by calling `setLogLevel` in the `@azure/logger`:

```ts snippet:SetLogLevel
import { setLogLevel } from "@azure/logger";

setLogLevel("info");
```

For more detailed instructions on how to enable logs, you can look at the [@azure/logger package docs](https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/core/logger).