The Amazon SDK for JavaScript v2 has reached end-of-support. We recommend that you migrate to [Amazon SDK for JavaScript v3](https://docs.amazonaws.cn//sdk-for-javascript/v3/developer-guide/). For additional details and information on how to migrate, please refer to this [announcement](https://amazonaws-china.com/blogs//developer/announcing-end-of-support-for-aws-sdk-for-javascript-v2/).

# Node.js Considerations
<a name="node-js-considerations"></a>

Although Node.js code is JavaScript, using the Amazon SDK for JavaScript in Node.js can differ from using the SDK in browser scripts. Some API methods work in Node.js but not in browser scripts, as well as the other way around. And successfully using some APIs depends on your familiarity with common Node.js coding patterns, such as importing and using other Node.js modules like the `File System (fs)` module.

## Using Built-In Node.js Modules
<a name="node-common-modules"></a>

Node.js provides a collection of built-in modules you can use without installing them. To use these modules, create an object with the `require` method to specify the module name. For example, to include the built-in HTTP module, use the following.

```
var http = require('http');
```

Invoke methods of the module as if they are methods of that object. For example, here is code that reads an HTML file.

```
// include File System module
var fs = require('fs'); 
// Invoke readFile method 
fs.readFile('index.html', function(err, data) {
  if (err) {
    throw err;
  } else {
    // Successful file read
  }
});
```

For a complete list of all built-in modules that Node.js provides, see [Node.js v6.11.1 Documentation](https://nodejs.org/api/modules.html) on the Node.js website.

## Using NPM Packages
<a name="node-npm-packages"></a>

In addition to the built-in modules, you can also include and incorporate third-party code from npm, the Node.js package manager. This is a repository of open source Node.js packages and a command-line interface for installing those packages. For more information about npm and a list of currently available packages, see [https://www.npmjs.com](https://www.npmjs.com). You can also learn about additional Node.js packages you can use [here on GitHub](https://github.com/sindresorhus/awesome-nodejs).

One example of an npm package you can use with the Amazon SDK for JavaScript is `browserify`. For details, see [Building the SDK as a Dependency with Browserify](building-sdk-for-browsers.md#building-using-browserify). Another example is `webpack`. For details, see [Bundling Applications with Webpack](webpack.md).

**Topics**
+ [Using Built-In Node.js Modules](#node-common-modules)
+ [Using NPM Packages](#node-npm-packages)
+ [Configuring maxSockets in Node.js](node-configuring-maxsockets.md)
+ [Reusing Connections with Keep-Alive in Node.js](node-reusing-connections.md)
+ [Configuring Proxies for Node.js](node-configuring-proxies.md)
+ [Registering Certificate Bundles in Node.js](node-registering-certs.md)