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# @aws-sdk/client-ec2

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## Description

AWS SDK for JavaScript EC2 Client for Node.js, Browser and React Native.

<fullname>Amazon Elastic Compute Cloud</fullname>

<p>Amazon Elastic Compute Cloud (Amazon EC2) provides secure and resizable computing capacity in the Amazon Web Services Cloud.
Using Amazon EC2 eliminates the need to invest in hardware up front, so you can develop and deploy applications
faster. Amazon Virtual Private Cloud (Amazon VPC) enables you to provision a logically isolated section of the
Amazon Web Services Cloud where you can launch Amazon Web Services resources in a virtual network that you've defined. Amazon Elastic Block Store
(Amazon EBS) provides block level storage volumes for use with EC2 instances. EBS volumes are highly available
and reliable storage volumes that can be attached to any running instance and used like a hard drive.</p>
<p>To learn more, see the following resources:</p>
<ul>
<li>
<p>Amazon EC2: <a href="http://aws.amazon.com/ec2">Amazon EC2 product page</a>, <a href="https://docs.aws.amazon.com/ec2/index.html">Amazon EC2 documentation</a>
</p>
</li>
<li>
<p>Amazon EBS: <a href="http://aws.amazon.com/ebs">Amazon EBS product page</a>, <a href="https://docs.aws.amazon.com/ebs/index.html">Amazon EBS documentation</a>
</p>
</li>
<li>
<p>Amazon VPC: <a href="http://aws.amazon.com/vpc">Amazon VPC product page</a>, <a href="https://docs.aws.amazon.com/vpc/index.html">Amazon VPC documentation</a>
</p>
</li>
<li>
<p>VPN: <a href="http://aws.amazon.com/vpn">VPN product page</a>, <a href="https://docs.aws.amazon.com/vpn/index.html">VPN documentation</a>
</p>
</li>
</ul>

## Installing

To install the this package, simply type add or install @aws-sdk/client-ec2
using your favorite package manager:

- `npm install @aws-sdk/client-ec2`
- `yarn add @aws-sdk/client-ec2`
- `pnpm add @aws-sdk/client-ec2`

## Getting Started

### Import

The AWS SDK is modulized by clients and commands.
To send a request, you only need to import the `EC2Client` and
the commands you need, for example `AcceptAddressTransferCommand`:

```js
// ES5 example
const { EC2Client, AcceptAddressTransferCommand } = require("@aws-sdk/client-ec2");
```

```ts
// ES6+ example
import { EC2Client, AcceptAddressTransferCommand } from "@aws-sdk/client-ec2";
```

### Usage

To send a request, you:

- Initiate client with configuration (e.g. credentials, region).
- Initiate command with input parameters.
- Call `send` operation on client with command object as input.
- If you are using a custom http handler, you may call `destroy()` to close open connections.

```js
// a client can be shared by different commands.
const client = new EC2Client({ region: "REGION" });

const params = {
  /** input parameters */
};
const command = new AcceptAddressTransferCommand(params);
```

#### Async/await

We recommend using [await](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/await)
operator to wait for the promise returned by send operation as follows:

```js
// async/await.
try {
  const data = await client.send(command);
  // process data.
} catch (error) {
  // error handling.
} finally {
  // finally.
}
```

Async-await is clean, concise, intuitive, easy to debug and has better error handling
as compared to using Promise chains or callbacks.

#### Promises

You can also use [Promise chaining](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_promises#chaining)
to execute send operation.

```js
client.send(command).then(
  (data) => {
    // process data.
  },
  (error) => {
    // error handling.
  }
);
```

Promises can also be called using `.catch()` and `.finally()` as follows:

```js
client
  .send(command)
  .then((data) => {
    // process data.
  })
  .catch((error) => {
    // error handling.
  })
  .finally(() => {
    // finally.
  });
```

#### Callbacks

We do not recommend using callbacks because of [callback hell](http://callbackhell.com/),
but they are supported by the send operation.

```js
// callbacks.
client.send(command, (err, data) => {
  // process err and data.
});
```

#### v2 compatible style

The client can also send requests using v2 compatible style.
However, it results in a bigger bundle size and may be dropped in next major version. More details in the blog post
on [modular packages in AWS SDK for JavaScript](https://aws.amazon.com/blogs/developer/modular-packages-in-aws-sdk-for-javascript/)

```ts
import * as AWS from "@aws-sdk/client-ec2";
const client = new AWS.EC2({ region: "REGION" });

// async/await.
try {
  const data = await client.acceptAddressTransfer(params);
  // process data.
} catch (error) {
  // error handling.
}

// Promises.
client
  .acceptAddressTransfer(params)
  .then((data) => {
    // process data.
  })
  .catch((error) => {
    // error handling.
  });

// callbacks.
client.acceptAddressTransfer(params, (err, data) => {
  // process err and data.
});
```

### Troubleshooting

When the service returns an exception, the error will include the exception information,
as well as response metadata (e.g. request id).

```js
try {
  const data = await client.send(command);
  // process data.
} catch (error) {
  const { requestId, cfId, extendedRequestId } = error.$$metadata;
  console.log({ requestId, cfId, extendedRequestId });
  /**
   * The keys within exceptions are also parsed.
   * You can access them by specifying exception names:
   * if (error.name === 'SomeServiceException') {
   *     const value = error.specialKeyInException;
   * }
   */
}
```

## Getting Help

Please use these community resources for getting help.
We use the GitHub issues for tracking bugs and feature requests, but have limited bandwidth to address them.

- Visit [Developer Guide](https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/welcome.html)
  or [API Reference](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/index.html).
- Check out the blog posts tagged with [`aws-sdk-js`](https://aws.amazon.com/blogs/developer/tag/aws-sdk-js/)
  on AWS Developer Blog.
- Ask a question on [StackOverflow](https://stackoverflow.com/questions/tagged/aws-sdk-js) and tag it with `aws-sdk-js`.
- Join the AWS JavaScript community on [gitter](https://gitter.im/aws/aws-sdk-js-v3).
- If it turns out that you may have found a bug, please [open an issue](https://github.com/aws/aws-sdk-js-v3/issues/new/choose).

To test your universal JavaScript code in Node.js, browser and react-native environments,
visit our [code samples repo](https://github.com/aws-samples/aws-sdk-js-tests).

## Contributing

This client code is generated automatically. Any modifications will be overwritten the next time the `@aws-sdk/client-ec2` package is updated.
To contribute to client you can check our [generate clients scripts](https://github.com/aws/aws-sdk-js-v3/tree/main/scripts/generate-clients).

## License

This SDK is distributed under the
[Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0),
see LICENSE for more information.
